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Document and Entity Information - USD ($)	12 Months Ended
Document and Entity Information - USD ($)	Dec. 31, 2018	Feb. 25, 2019	Jun. 30, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	BankUnited, Inc.
Entity Central Index Key	0001504008
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q4
Amendment Flag	false
Entity Common Stock Shares Outstanding		98,591,661
Entity Public Float			$ 4,287,268,982
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Cash and due from banks:
Non-interest bearing	$ 9,392	$ 35,246
Interest bearing	372,681	159,336
Cash and cash equivalents	382,073	194,582
Investment securities (including securities recorded at fair value of $8,156,878 and $6,680,832)	8,166,878	6,690,832
Non-marketable equity securities	267,052	265,989
Loans held for sale	36,992	34,097
Loans (including covered loans of $201,376 and $503,118)	21,977,008	21,416,504
Allowance for loan and lease losses	(109,931)	(144,795)
Loans, net	21,867,077	21,271,709
FDIC indemnification asset	0	295,635
Bank owned life insurance	263,340	252,462
Equipment under operating lease, net	702,354	599,502
Goodwill and other intangible assets	77,718	77,796
Other assets	400,842	664,382
Total assets	32,164,326	30,346,986
Demand deposits:
Non-interest bearing	3,621,254	3,071,032
Interest bearing	1,771,465	1,757,581
Savings and money market	11,261,746	10,715,024
Time Deposits	6,819,758	6,334,842
Total deposits	23,474,223	21,878,479
Federal Funds Purchased	175,000	0
Federal Home Loan Bank advances	4,796,000	4,771,000
Notes and other borrowings	402,749	402,830
Other liabilities	392,521	268,615
Total liabilities	29,240,493	27,320,924
Commitments and contingencies
Stockholders' equity:
Common stock, par value $0.01 per share, 400,000,000 shares authorized; 99,141,374 and 106,848,185 shares issued and outstanding	991	1,068
Paid-in capital	1,220,147	1,498,227
Retained earnings	1,697,822	1,471,781
Accumulated other comprehensive income	4,873	54,986
Total stockholders' equity	2,923,833	3,026,062
Total liabilities and stockholders' equity	$ 32,164,326	$ 30,346,986

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Investments, Fair Value Disclosure	$ 8,156,878,000	$ 6,680,832,000
ASSETS
Covered loans net of premiums, discounts and deferred fees and costs	$ 201,376,000	$ 503,118,000
Stockholders' equity:
Common stock, par value (in Dollars per Share)	$ 0.01	$ 0.01
Common stock, shares authorized (in Shares)	400,000,000	400,000,000
Common stock, shares issued (in Shares)	99,141,374	106,848,185
Common stock, shares outstanding (in Shares)	99,141,374	106,848,185

CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest income:
Loans	$ 1,198,241	$ 1,001,862	$ 896,154
Investment Securities	233,091	188,307	150,859
Other	17,812	14,292	12,204
Total interest income	1,449,144	1,204,461	1,059,217
Interest expense:
Deposits	284,563	170,933	119,773
Borrowings	114,488	83,256	69,059
Total interest expense	399,051	254,189	188,832
Net interest income before provision for loan losses	1,050,093	950,272	870,385
Provision for loan losses	25,925	68,747	50,911
Net interest income after provision for loan losses	1,024,168	881,525	819,474
Non-interest income:
Income from resolution of covered assets, net	11,551	27,450	36,155
Net loss on FDIC indemnification	(4,199)	(22,220)	(17,759)
Deposit service charges and fees	14,040	12,997	12,780
Gain on sale of loans, net	15,864	27,589	(4,406)
Gain on investment securities, net	3,159	33,466	14,461
Lease financing	61,685	53,837	44,738
Other non-interest income	29,922	24,785	20,448
Total non-interest income	132,022	157,904	106,417
Non-interest expense:
Employee compensation and benefits	254,997	237,824	223,011
Occupancy and equipment	55,899	58,100	59,022
Amortization of FDIC indemnification asset	261,763	176,466	160,091
Deposit insurance expense	18,984	22,011	17,806
Professional fees	16,539	23,676	14,249
Technology and telecommunications	35,136	31,252	31,324
Depreciation of equipment under operating lease	40,025	35,015	31,580
Other non-interest expense	57,197	50,624	53,364
Total non-interest expense	740,540	634,968	590,447
Income before income taxes	415,650	404,461	335,444
Provision (benefit) for income taxes	90,784	(209,812)	109,703
Net income	$ 324,866	$ 614,273	$ 225,741
Earnings Per Share, Basic	$ 3.01	$ 5.60	$ 2.11
Earnings Per Share, Diluted	$ 2.99	$ 5.58	$ 2.09

CONSOLIDATED STATEMENTS OF INCOME (Parenthetical) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Provision for loan losses	$ 12,583	$ 1,200	$ 8,995	$ 3,147	$ 5,174	$ 37,854	$ 13,619	$ 12,100	$ 25,925	$ 68,747	$ 50,911
Non-interest income:
Gain on sale of loans, net									15,864	27,589	(4,406)
Covered [Member]
Provision for loan losses	235				261				752	1,358	(1,681)
Non-interest income:
Gain on sale of loans, net	$ 993				$ 0				$ 5,732	$ 17,406	$ (14,470)

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 52,403	$ 97,328	$ 89,900	$ 85,235	$ 417,794	$ 67,779	$ 66,407	$ 62,293	$ 324,866	$ 614,273	$ 225,741
Unrealized gains on investment securities available for sale:
Net unrealized holding gain (loss) arising during the period									(57,041)	29,724	14,271
Reclassification adjustment for net securities gains realized in income									(4,486)	(20,247)	(8,749)
Net change in unrealized gain on securities available for sale									(61,527)	9,477	5,522
Unrealized gains on derivative instruments:
Net unrealized holding gain (loss) arising during the period									3,981	(1,559)	3,766
Reclassification adjustment for net (gains) losses realized in income									(1,469)	5,821	9,777
Net change in unrealized gains on derivative instruments									2,512	4,262	13,543
Other comprehensive income (loss)									(59,015)	13,739	19,065
Comprehensive income									$ 265,851	$ 628,012	$ 244,806

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net income	$ 324,866	$ 614,273	$ 225,741
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization and accretion, net	(86,549)	(95,145)	(113,979)
Provision for loan losses	25,925	68,747	50,911
Income from resolution of covered assets, net	(11,551)	(27,450)	(36,155)
Net loss on FDIC indemnification	4,199	22,220	17,759
(Gain) loss on sale of loans, net	(15,864)	(27,589)	4,406
Gain on investment securities, net	(3,159)	(33,466)	(14,461)
Equity based compensation	23,137	22,692	18,032
Depreciation and amortization	64,268	61,552	56,444
Deferred income taxes	67,778	57,801	30,189
Proceeds from sale of loans held for sale	268,589	158,621	163,088
Loans originated for sale, net of repayments	(155,974)	(142,682)	(148,195)
Other:
(Increase) decrease in other assets	236,461	(319,629)	21,371
Increase (decrease) in other liabilities	82,126	(41,319)	33,359
Net cash provided by operating activities	824,252	318,626	308,510
Net Cash Provided by (Used in) Investing Activities [Abstract]
Purchase of investment securities	(4,138,994)	(3,131,798)	(3,058,106)
Proceeds from repayments and calls of investment securities	1,533,951	1,260,444	724,666
Proceeds from sale of investment securities	1,030,810	1,287,591	1,127,983
Purchase of non-marketable equity securities	(308,126)	(248,405)	(255,100)
Proceeds from redemption of non-marketable equity securities	307,063	266,688	190,825
Purchases of loans	(1,308,772)	(1,300,996)	(1,266,097)
Loan originations, repayments and resolutions, net	404,769	(672,338)	(1,394,916)
Proceeds from sale of loans, net	544,745	196,413	171,367
Proceeds from sale of equipment under operating lease	52,134	4,950	583
Proceeds from Sale of Mortgage Servicing Rights (MSR)	34,573	0	0
Acquisition of equipment under operating lease	(190,500)	(99,553)	(88,559)
Other investing activities	(3,184)	(15,572)	21,123
Net cash used in investing activities	(2,041,531)	(2,452,576)	(3,826,231)
Cash flows from financing activities:
Net increase in deposits	1,595,744	2,387,589	2,552,389
Net increase in federal funds purchased	175,000	0	0
Additions to Federal Home Loan Bank advances	4,647,000	4,916,000	4,025,000
Repayments of Federal Home Loan Bank advances	(4,622,000)	(5,385,000)	(2,795,000)
Dividends paid	(91,305)	(91,628)	(89,824)
Exercise of stock options	7,727	62,095	791
Repurchase of common stock	(299,972)	0	0
Other financing activities	(7,424)	(8,837)	5,178
Net cash provided by financing activities	1,404,770	1,880,219	3,698,534
Net increase (decrease) in cash and cash equivalents	187,491	(253,731)	180,813
Cash and cash equivalents, beginning of period	194,582	448,313	267,500
Cash and cash equivalents, end of period	382,073	194,582	448,313
Supplemental Cash Flow Information [Abstract]
Interest paid	387,801	247,548	186,525
Income taxes (refunded) paid, net	(288,267)	69,231	16,464
Supplemental schedule of non-cash investing and financing activities:
Transfers from loans to other real estate owned and other repossessed assets	9,709	13,313	17,045
Transfers from loans to loans held for sale	108,503	1,973	2,090
Dividends declared, not paid	21,673	23,055	22,510
Obligations incurred in acquisition of affordable housing limited partnerships	$ 4,710	$ 0	$ 12,750

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) $ in Thousands	Total	Common Stock	Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income
Common Stock, Dividends, Per Share, Declared	$ 0.84
Balance (in Shares) at Dec. 31, 2015		103,626,255
Balance at Dec. 31, 2015	$ 2,243,898	$ 1,036	$ 1,406,786	$ 813,894	$ 22,182
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	244,806			225,741	19,065
Dividends ($0.84 per common share)	(89,954)			(89,954)
Equity based compensation (in Shares)		651,760
Equity based compensation	18,033	$ 7	18,026
Forfeiture of unvested shares (in Shares)		(159,049)
Forfeiture of unvested shares and shares surrendered for tax withholding obligations	$ (485)	$ (1)	(484)
Exercise of stock options (in Shares)	47,979	47,979
Exercise of stock options	$ 791	$ 0	791
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	1,340		1,340
Balance (in Shares) at Dec. 31, 2016		104,166,945
Balance at Dec. 31, 2016	$ 2,418,429	$ 1,042	1,426,459	949,681	41,247
Common Stock, Dividends, Per Share, Declared	$ 0.84
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	$ 628,012			614,273	13,739
Dividends ($0.84 per common share)	(92,173)			(92,173)
Equity based compensation (in Shares)		621,806
Equity based compensation	16,996	$ 6	16,990
Forfeiture of unvested shares (in Shares)		(271,954)
Forfeiture of unvested shares and shares surrendered for tax withholding obligations	$ (7,297)	$ (3)	(7,294)
Exercise of stock options (in Shares)	2,331,388	2,331,388
Exercise of stock options	$ 62,095	$ 23	62,072
Balance (in Shares) at Dec. 31, 2017		106,848,185
Balance at Dec. 31, 2017	$ 3,026,062	$ 1,068	1,498,227	1,471,781	54,986
Common Stock, Dividends, Per Share, Declared	$ 0.84
Cumulative Effect of New Accounting Principle in Period of Adoption				(8,902)	8,902
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	$ 265,851			324,866	(59,015)
Dividends ($0.84 per common share)	(89,923)			(89,923)
Equity based compensation (in Shares)		696,729
Equity based compensation	20,647	$ 7	20,640
Forfeiture of unvested shares (in Shares)		(252,091)
Forfeiture of unvested shares and shares surrendered for tax withholding obligations	$ (6,559)	$ (3)	(6,556)
Exercise of stock options (in Shares)	291,689	291,689
Exercise of stock options	$ 7,727	$ 3	7,724
Stock Repurchased During Period, Shares		(8,443,138)
Stock Repurchased During Period, Value	(299,972)	$ (84)	(299,888)
Balance (in Shares) at Dec. 31, 2018		99,141,374
Balance at Dec. 31, 2018	$ 2,923,833	$ 991	$ 1,220,147	$ 1,697,822	$ 4,873

Basis of Presentation and Summary of Significant Accounting Policies Basis of Presentation (Notes)

12 Months Ended

Dec. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation and Significant Accounting Policies [Text Block]

Note 1 Basis of Presentation and Summary of Significant Accounting Policies

BankUnited, Inc. is a national bank holding company with one wholly-owned subsidiary, BankUnited; collectively, the Company. BankUnited, a national banking association headquartered in Miami Lakes, Florida, provides a full range of banking and related services to individual and corporate customers in it's geographic footprint in Florida and the New York metropolitan area. The Bank also offers certain commercial lending and deposit products through national platforms.

In connection with the FSB Acquisition, BankUnited entered into two loss sharing agreements with the FDIC. The Loss Sharing Agreements consisted of the Single Family Shared-Loss Agreement and the Commercial Shared-Loss Agreement. Assets covered by the Loss Sharing Agreements are referred to as covered assets or, in certain cases, covered loans. The Single Family Shared-Loss Agreement provided for FDIC loss sharing and the Bank’s reimbursement for recoveries to the FDIC through its termination on February 13, 2019 for single family residential loans and OREO. Loss sharing under the Commercial Shared-Loss Agreement terminated on May 21, 2014. The Commercial Shared-Loss Agreement continued to provide for the Bank’s reimbursement of recoveries to the FDIC through June 30, 2017 for all other covered assets, including commercial real estate, commercial and industrial and consumer loans, certain investment securities and commercial OREO. Pursuant to the terms of the Loss Sharing Agreements, the covered assets were subject to a stated loss threshold whereby the FDIC reimbursed BankUnited for 80% of losses related to the covered assets up to $4.0 billion and 95% of losses in excess of this amount, beginning with the first dollar of loss incurred.

The consolidated financial statements have been prepared in accordance with GAAP and prevailing practices in the banking industry.

The Company has a single reportable segment.

Accounting Estimates

In preparing the consolidated financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues, and expenses and disclosures of contingent assets and liabilities. Actual results could differ significantly from these estimates.

Significant estimates include the ALLL, the amount and timing of expected cash flows from covered assets and the FDIC indemnification asset, and the fair values of investment securities and other financial instruments.

Principles of Consolidation

The consolidated financial statements include the accounts of BankUnited, Inc. and its wholly-owned subsidiary. All significant intercompany balances and transactions have been eliminated in consolidation. VIEs are consolidated if the Company is the primary beneficiary; i.e., has (i) the power to direct the activities of the VIE that most significantly impact the VIE's economic performance and (ii) the obligation to absorb losses or the right to receive benefits that could potentially be significant to the VIE. The Company has variable interests in affordable housing limited partnerships that are not required to be consolidated because the Company is not the primary beneficiary.

Fair Value Measurements

Certain of the Company's assets and liabilities are reflected in the consolidated financial statements at fair value on either a recurring or non-recurring basis. Investment securities available for sale, marketable equity securities, servicing rights and derivative instruments are measured at fair value on a recurring basis. Assets measured at fair value or fair value less cost to sell on a non-recurring basis may include collateral dependent impaired loans, OREO and other repossessed assets, loans held for sale, goodwill and impaired long-lived assets. These non-recurring fair value measurements typically involve lower-of-cost-or-market accounting or the measurement of impairment of certain assets.

Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants at the measurement date. GAAP establishes a hierarchy that prioritizes inputs used to determine fair value measurements into three levels based on the observability and transparency of the inputs:


•	Level 1 inputs are unadjusted quoted prices in active markets that are accessible at the measurement date for identical assets or liabilities.


•	Level 2 inputs are observable inputs other than level 1 inputs, including quoted prices for similar assets and liabilities, quoted prices for identical assets and liabilities in less active markets and other inputs that can be corroborated by observable market data.


•	Level 3 inputs are unobservable inputs supported by limited or no market activity or data and inputs requiring significant management judgment or estimation.

The fair value hierarchy requires the Company to maximize the use of observable inputs and minimize the use of unobservable inputs in estimating fair value. Unobservable inputs are utilized in determining fair value measurements only to the extent that observable inputs are unavailable. The need to use unobservable inputs generally results from a lack of market liquidity and diminished observability of actual trades or assumptions that would otherwise be available to value a particular asset or liability.

Cash and Cash Equivalents

Cash and cash equivalents include cash and due from banks, both interest bearing and non-interest bearing, including amounts on deposit at the Federal Reserve Bank, and federal funds sold. Cash equivalents have original maturities of three months or less. For purposes of reporting cash flows, cash receipts and payments pertaining to FHLB advances with original maturities of three months or less are reported net.

Investment Securities

Debt securities that the Company has the positive intent and ability to hold to maturity are classified as held to maturity and reported at amortized cost. Debt securities that the Company may not have the intent to hold to maturity are classified as available for sale at the time of acquisition and carried at fair value with unrealized gains and losses, net of tax, excluded from earnings and reported in AOCI, a separate component of stockholders' equity. Securities classified as available for sale may be used as part of the Company's asset/liability management strategy and may be sold in response to liquidity needs, regulatory changes, changes in interest rates, prepayment risk or other market factors. The Company does not maintain a trading portfolio. Purchase premiums and discounts on debt securities are amortized as adjustments to yield over the expected lives of the securities, using the level yield method. Premiums are amortized to the call date if the call is considered to be clearly and closely related to the host contract. Realized gains and losses from sales of securities are recorded on the trade date and are determined using the specific identification method.

The Company reviews investment securities for OTTI at least quarterly. An investment security is impaired if its fair value is lower than its amortized cost basis. The Company considers many factors in determining whether a decline in fair value below amortized cost represents OTTI, including, but not limited to:


•	the Company's intent to hold the security until maturity or for a period of time sufficient for a recovery in value;


•	whether it is more likely than not that the Company will be required to sell the security prior to recovery of its amortized cost basis;


•	the length of time and extent to which fair value has been less than amortized cost;


•	adverse changes in expected cash flows;


•	collateral values and performance;


•	the payment structure of the security including levels of subordination or over-collateralization;


•	changes in the economic or regulatory environment;


•	the general market condition of the geographic area or industry of the issuer;


•	the issuer's financial condition, performance and business prospects; and


•	changes in credit ratings.

The relative importance assigned to each of these factors varies depending on the facts and circumstances pertinent to the individual security being evaluated.

The Company recognizes OTTI of a debt security for which there has been a decline in fair value below amortized cost if (i) management intends to sell the security, (ii) it is more likely than not that the Company will be required to sell the security before recovery of its amortized cost basis, or (iii) the Company does not expect to recover the entire amortized cost basis of the security. If the Company intends to sell the security, or if it is more likely than not it will be required to sell the security before recovery, an OTTI write-down is recognized in earnings equal to the entire difference between the amortized cost basis and fair value of the security. Otherwise, the amount by which amortized cost exceeds the fair value of a debt security that is considered to be other-than-temporarily impaired is separated into a component representing the credit loss, which is recognized in earnings, and a component related to all other factors, which is recognized in other comprehensive income. The measurement of the credit loss component is equal to the difference between the debt security's amortized cost basis and the present value of its expected future cash flows discounted at the security's effective yield.

Marketable equity securities with readily determinable fair values are reported at fair value with unrealized gains and losses included in earnings effective January 1, 2018. Equity securities that do not have readily determinable fair values are reported at cost and re-measured at fair value upon occurrence of an observable price change or recognition of impairment.

Non-marketable Equity Securities

The Bank, as a member of the FRB system and the FHLB, is required to maintain investments in the stock of the FRB and FHLB. No market exists for this stock, and the investment can be liquidated only through redemption by the respective institutions, at the discretion of and subject to conditions imposed by those institutions. The stock has no readily determinable fair value and is carried at cost. Historically, stock redemptions have been at par value, which equals the Company's carrying value. The Company monitors its investment in FHLB stock for impairment through review of recent financial results of the FHLB, including capital adequacy and liquidity position, dividend payment history, redemption history and information from credit agencies. The Company has not identified any indicators of impairment of FHLB stock.

Loans Held for Sale

The guaranteed portion of SBA and USDA loans originated with the intent to sell are carried at the lower of cost or fair value, determined in the aggregate. A valuation allowance is established through a charge to earnings if the aggregate fair value of such loans is lower than their cost. Gains or losses recognized upon sale are determined on the specific identification basis.

Loans not originated or otherwise acquired with the intent to sell are transferred into the held for sale classification at the lower of carrying amount or fair value when they are specifically identified for sale and a formal plan exists to sell them. Acquired credit impaired loans accounted for in pools are removed from the pools at their carrying amounts when they are sold.

Loans

The Company's loan portfolio contains 1-4 single family residential first mortgages, government insured residential mortgages, home equity loans and lines of credit, consumer, multi-family, owner and non-owner occupied commercial real estate, construction and land, and commercial and industrial loans, mortgage warehouse lines of credit and direct financing leases. The Company segregates its loan portfolio between covered and non-covered loans. Covered loans are loans acquired from the FDIC in the FSB Acquisition that are covered under the Single Family Shared-Loss Agreement. Covered loans are further segregated between ACI loans and non-ACI loans.

Non-covered Loans

Non-covered loans, other than non-covered ACI loans, are carried at UPB, net of premiums, discounts, unearned income, deferred loan origination fees and costs, and the ALLL

Interest income on these loans is accrued based on the principal amount outstanding. Non-refundable loan origination fees, net of direct costs of originating or acquiring loans, as well as purchase premiums and discounts, are deferred and recognized as adjustments to yield over the contractual lives of the related loans using the level yield method.

Direct Financing Leases

Direct financing leases are carried at the aggregate of lease payments receivable and estimated residual value of the leased property, if applicable, less unearned income. Interest income on direct financing leases is recognized over the term of the leases to achieve a constant periodic rate of return on the outstanding investment. Initial direct costs are deferred and amortized over the lease term as a reduction to interest income using the effective interest method.

ACI Loans

ACI loans, all of which were acquired in the FSB Acquisition and the substantial majority of which are covered under the Single Family Shared-Loss Agreement, are those for which, at acquisition, management determined it probable that the Company would be unable to collect all contractual principal and interest payments due. These loans were recorded at estimated fair value at acquisition, measured as the present value of all cash flows expected to be received, discounted at an appropriately risk-adjusted discount rate. Initial cash flow expectations incorporated significant assumptions regarding prepayment rates, frequency of default and loss severity.

The difference between total contractually required payments on ACI loans and the cash flows expected to be received represents non-accretable difference. The excess of all cash flows expected to be received over the Company's recorded investment in the loans represents accretable yield and is recognized as interest income on a level-yield basis over the expected life of the loans.

The Company aggregated ACI 1-4 single family residential mortgage loans and home equity loans and lines of credit with similar risk characteristics into homogenous pools at acquisition. A composite interest rate and composite expectations of future cash flows are used in accounting for each pool. These loans were aggregated into pools based on the following characteristics:


•	delinquency status;


•	product type, in particular, amortizing as opposed to option ARMs;


•	loan-to-value ratio; and


•	borrower FICO score.

Loans that do not have similar risk characteristics, primarily commercial and commercial real estate loans, are accounted for on an individual loan basis using interest rates and expectations of cash flows for each loan.

The Company is required to develop reasonable expectations about the timing and amount of cash flows to be collected related to ACI loans and to continue to update those estimates over the lives of the loans. Expected cash flows from ACI loans are updated quarterly. If it is probable that the Company will be unable to collect all the cash flows expected from a loan or pool at acquisition plus additional cash flows expected to be collected arising from changes in estimates after acquisition, the loan or pool is considered impaired and a valuation allowance is established by a charge to the provision for loan losses. If there is an increase in expected cash flows from a loan or pool, the Company first reduces any valuation allowance previously established by the amount of the increase in the present value of expected cash flows, and then recalculates the amount of accretable yield for that loan or pool. The adjustment of accretable yield due to an increase in expected cash flows, as well as changes in expected cash flows due to changes in interest rate indices and changes in prepayment assumptions is accounted for prospectively as a change in yield. Additional cash flows expected to be collected are transferred from non-accretable difference to accretable yield and the amount of periodic accretion is adjusted accordingly over the remaining life of the loan or pool.

The Company may resolve an ACI loan either through a sale of the loan, by working with the customer and obtaining partial or full repayment, by short sale of the collateral, or by foreclosure. When a loan accounted for in a pool is resolved, it is removed from the pool at its allocated carrying amount. In the event of a sale of the loan, the Company recognizes a gain or loss on sale based on the difference between the sales proceeds and the carrying amount of the loan. For loans resolved through pre-payment or short sale of the collateral, the Company recognizes the difference between the amount of the payment received and the carrying amount of the loan in the income statement line item "Income from resolution of covered assets, net". For loans resolved through foreclosure, the difference between the fair value of the collateral obtained through foreclosure less estimated cost to sell and the carrying amount of the loan is recognized in the income statement line item "Income from resolution of covered assets, net". Any remaining accretable discount related to loans not accounted for in pools that are resolved by full or partial pre-payment, short sale or foreclosure is recognized in interest income at the time of resolution, to the extent collected.

Payments received earlier than expected or in excess of expected cash flows from sales or other resolutions may result in the carrying value of a pool being reduced to zero even though outstanding contractual balances and expected cash flows remain related to loans in the pool. Once the carrying value of a pool is reduced to zero, any future proceeds, which may include cash or real estate acquired in foreclosure, from the remaining loans, representing further realization of accretable yield, are recognized as interest income upon receipt.

Covered Non-ACI Loans

Loans acquired in the FSB Acquisition without evidence of deterioration in credit quality since origination were initially recorded at estimated fair value on the acquisition date. Non-ACI 1-4 single family residential mortgage loans and home equity loans and lines of credit with similar risk characteristics were aggregated into pools for accounting purposes at acquisition. Non-ACI loans are carried at the principal amount outstanding, adjusted for unamortized acquisition date fair value adjustments and the ALLL. Interest income is accrued based on the UPB and, with the exception of home equity loans and lines of credit, acquisition date fair value adjustments are amortized using the level-yield method over the expected lives of the related loans. For non-ACI 1-4 family residential mortgage loans accounted for in pools, prepayment estimates are used in determining the periodic amortization of acquisition date fair value adjustments. Acquisition date fair value adjustments related to revolving home equity loans and lines of credit are amortized on a straight-line basis.

Non-accrual Loans

Commercial loans, other than ACI loans, are placed on non-accrual status when (i) management has determined that full repayment of all contractual principal and interest is in doubt, or (ii) the loan is past due 90 days or more as to principal or interest unless the loan is well secured and in the process of collection. Residential and consumer loans, other than ACI loans, are generally placed on non-accrual status when 90 days of interest is due and unpaid. When a loan is placed on non-accrual status, uncollected interest accrued is reversed and charged to interest income. Payments received on nonaccrual commercial loans are applied as a reduction of principal. Interest payments are recognized as income on a cash basis on nonaccrual residential loans. Commercial loans are returned to accrual status only after all past due principal and interest has been collected and full repayment of remaining contractual principal and interest is reasonably assured. Residential and consumer loans are returned to accrual status when there is no longer 90 days of interest due and unpaid. Past due status of loans is determined based on the contractual next payment due date. Loans less than 30 days past due are reported as current.

Contractually delinquent ACI loans are not classified as non-accrual as long as discount continues to be accreted on the loans or pools.

Impaired Loans

Loans, other than ACI loans and government insured residential loans, are considered impaired when, based on current information and events, it is probable that the Company will be unable to collect the scheduled payments of principal or interest when due, according to the contractual terms of the loan agreements. Commercial relationships with committed balances greater than or equal to $1.0 million that have internal risk ratings of substandard or doubtful and are on non-accrual status, as well as loans that have been modified in TDRs, are individually evaluated for impairment. Other commercial relationships on non-accrual status with committed balances under $1.0 million may also be evaluated individually for impairment at management's discretion. The likelihood of loss related to loans assigned internal risk ratings of substandard or doubtful is considered elevated due to their identified credit weaknesses. Factors considered by management in evaluating impairment include payment status, financial condition of the borrower, collateral value, and other factors impacting the probability of collecting scheduled principal and interest payments when due.

An ACI pool or loan is considered to be impaired when it is probable that the Company will be unable to collect all the cash flows expected at acquisition, plus additional cash flows expected to be collected arising from changes in estimates after acquisition. 1-4 single family residential and home equity ACI loans accounted for in pools are evaluated collectively for impairment on a pool by pool basis based on expected pool cash flows. Commercial ACI loans are individually evaluated for impairment based on expected cash flows from the individual loans. Discount continues to be accreted on ACI loans or pools as long as there are expected future cash flows in excess of the current carrying amount of the loans or pools.

Troubled Debt Restructurings

In certain situations, due to economic or legal reasons related to a borrower's financial difficulties, the Company may grant a concession to the borrower for other than an insignificant period of time that it would not otherwise consider. At that time, except for ACI loans accounted for in pools, the related loan is classified as a TDR and considered impaired. The concessions granted may include rate reductions, principal forgiveness, payment forbearance, extensions of maturity at rates of interest below that commensurate with the risk profile of the loans, modification of payment terms and other actions intended to minimize economic loss. A TDR is generally placed on non-accrual status at the time of the modification unless the borrower was performing prior to the restructuring. Modified ACI loans accounted for in pools are not accounted for as TDRs, are not separated from the pools and are not classified as impaired loans.

Allowance for Loan and Lease Losses

The ALLL represents the amount considered adequate by management to absorb probable incurred losses inherent in the loan portfolio at the balance sheet date. The ALLL consists of both specific and general components. The ALLL is established as losses are estimated to have occurred through a provision charged to earnings. Individual loans are charged off against the ALLL when management determines them to be uncollectible.

An assessment of collateral value is made at no later than 120 days delinquency for non-covered open- and closed-end loans secured by residential real estate; any outstanding loan balance in excess of fair value less cost to sell is charged off at no later than 180 days delinquency. Additionally, any outstanding balance in excess of fair value of collateral less cost to sell is charged off (i) within 60 days of receipt of notification of filing from the bankruptcy court, (ii) within 60 days of determination of loss if all borrowers are deceased or (iii) within 90 days of discovery of fraudulent activity. Covered non-ACI loans secured by residential real estate are generally charged off at final resolution which is consistent with the terms of the Single Family Shared-Loss Agreement. Consumer loans are typically charged off at 120 days delinquency. Commercial loans are charged off when management deems them to be uncollectible. Subsequent recoveries are credited to the ALLL.

Commercial loans

The allowance is comprised of specific reserves for loans that are individually evaluated and determined to be impaired as well as general reserves for loans that have not been identified as impaired.

Management believes that loans rated special mention, substandard or doubtful that are not individually evaluated for impairment exhibit characteristics indicative of a heightened level of credit risk. A quantitative loss factor is applied to loans rated special mention based on average annual probability of default and implied severity, derived from internal and external data. Loss factors for substandard and doubtful loans that are not individually evaluated are determined by using default frequency and severity information applied at the loan level. Estimated default frequencies and severities are based on available industry and internal data. In addition, a floor is applied to these calculated loss factors, based on the loss factor applied to the special mention portfolio.

To the extent, in management's judgment, commercial portfolio segments have sufficient observable loss history, the quantitative portion of the ALLL is based on the Bank's historical net charge-off rates. These commercial segments include commercial and industrial loans and the Bridge portfolios. For commercial portfolio segments that have not yet exhibited an observable loss trend, the quantitative loss factors are based on peer group average annual historical net charge-off rates by loan class and the Company’s internal credit risk rating system. These commercial segments include multifamily, non-owner occupied commercial real estate and construction and land loans. Quantitative loss factors for SBF loans are based on historical charge-off rates published by the SBA. For Pinnacle, quantitative loss factors are based primarily on historical municipal default data. For most commercial portfolio segments, we use a 20 quarter look-back period in the calculation of historical net charge-off rates.

Where applicable, the peer group used to calculate average annual historical net charge-off rates used in estimating general reserves is made up of 26 banks included in the OCC Midsize Bank Group plus five additional banks not included in the OCC Midsize Bank Group that management believes to be comparable based on size, geography and nature of lending operations. Peer bank data is obtained from the Statistics on Depository Institutions Report published by the FDIC for the most recent quarter available. These banks, as a group, are considered by management to be comparable to BankUnited in size, nature of lending operations and loan portfolio composition. We evaluate the composition of the peer group annually, or more frequently if, in our judgment, a more frequent evaluation is necessary. Our internal risk rating system comprises 13 credit grades; grades 1 through 8 are “pass” grades. The risk ratings are driven largely by debt service coverage. Peer group historical loss rates are adjusted upward for loans assigned a lower “pass” rating.

As noted above, management generally use a 20 quarter look-back period to calculate quantitative loss rates. Management believes this look-back period to be consistent with the range of industry practice and appropriate to capture a sufficient range of observations reflecting the performance of our loans, which were originated in the current economic cycle. With the exception of the Pinnacle municipal finance portfolio, a four quarter loss emergence period is used in the calculation of general reserves. A twelve quarter loss emergence period is used in the calculation of general reserves for the Pinnacle portfolio.

The primary assumptions underlying estimates of expected cash flows for ACI commercial loans are default probability and severity of loss given default. Assessments of default probability and severity are based on net realizable value analyses prepared at the individual loan level.

Residential and other consumer loans

Non-covered Loans

The non-covered loan portfolio has not yet developed an observable loss trend. Therefore, the ALLL for non-covered residential loans is based primarily on relevant proxy historical loss rates. The ALLL for non-covered 1-4 single family residential loans, excluding government insured residential loans, is estimated using average annual loss rates on prime residential mortgage securitizations issued between 2003 and 2008 as a proxy. Based on the comparability of FICO scores and LTV ratios between loans included in those securitizations and loans in the Bank’s portfolio and the geographic diversity in the new purchased residential portfolio, we determined that prime residential mortgage securitizations provide an appropriate proxy for incurred losses in this portfolio class. A peer group 18-quarter average net charge-off rate is used to estimate the ALLL for the non-covered home equity and other consumer loan classes. The non-covered home equity and other consumer loan portfolios are not significant components of the overall loan portfolio. No quantitative ALLL is provided for U.S. Government insured residential loans.

Covered non-ACI Loans

The reserving methodology for the non-ACI 1-4 single family residential mortgages is consistent with the methodology to calculated the ALLL for non-covered residential portfolio segment discussed above.

Qualitative Factors

Qualitative adjustments are made to the ALLL when, based on management’s judgment, there are internal or external factors impacting probable incurred losses not taken into account by the quantitative calculations. Potential qualitative adjustments are categorized as follows:


•	Portfolio performance trends, including trends in and the levels of delinquencies, non-performing loans and classified loans;


•	Changes in the nature of the portfolio and terms of the loans, specifically including the volume and nature of policy and procedural exceptions;


•	Portfolio growth trends;


•	Changes in lending policies and procedures, including credit and underwriting guidelines and portfolio management practices;


•	Economic factors, including unemployment rates and GDP growth rates and other factors considered relevant by management;


•	Changes in the value of underlying collateral;


•	Quality of risk ratings, as evaluated by our independent credit review function;


•	Credit concentrations;


•	Changes in and experience levels of credit administration management and staff; and


•	Other factors identified by management that may impact the level of losses inherent in the portfolio, including but not limited to competition and legal and regulatory considerations.

Covered ACI Loans

For ACI loans, a valuation allowance is established when periodic evaluations of expected cash flows reflect a deterioration resulting from credit related factors from the level of cash flows that were estimated to be collected at acquisition plus any additional expected cash flows arising from revisions in those estimates. A quarterly analysis of expected cash flows is performed for ACI loans.

Expected cash flows are estimated on a pool basis for ACI 1-4 single family residential loans. The analysis of expected cash flows incorporates updated expected prepayment rate, default rate, delinquency level and loss severity given default assumptions.

Reserve for Unfunded Commitments

The reserve for unfunded commitments represents the estimated probable losses related to unfunded lending commitments. The reserve is calculated in a manner similar to the general reserve for non-covered loans, while also considering the timing and likelihood that the available credit will be utilized as well as the exposure upon default. The reserve for unfunded commitments is presented within other liabilities on the consolidated balance sheets, distinct from the ALLL, and adjustments to the reserve for unfunded commitments are included in other non-interest expense in the consolidated statements of income.

FDIC Indemnification Asset

The FDIC indemnification asset was initially recorded at the time of the FSB Acquisition at fair value, measured as the present value of the estimated cash payments expected from the FDIC for probable losses on covered assets. The FDIC indemnification asset is measured separately from the related covered assets. It is not contractually embedded in the covered assets and it is not transferable with the covered assets should the Company choose to dispose of them.

Impairment of expected cash flows from covered assets results in an increase in cash flows expected to be collected from the FDIC. These increased expected cash flows from the FDIC are recognized as increases in the FDIC indemnification asset and as non-interest income in the same period that the impairment of the covered assets is recognized in the provision for loan losses. Increases in expected cash flows from covered assets result in decreases in cash flows expected to be collected from the FDIC. These decreases in expected cash flows from the FDIC are recognized immediately in earnings to the extent that they relate to a reversal of a previously recorded valuation allowance related to the covered assets. Any remaining decreases in cash flows expected to be collected from the FDIC are recognized prospectively through an adjustment of the rate of accretion or amortization on the FDIC indemnification asset, consistent with the approach taken to recognize increases in expected cash flows on the covered assets. Amortization of the FDIC indemnification asset results from circumstances in which, due to improvement in expected cash flows from the covered assets, expected cash flows from the FDIC are less than the carrying value of the FDIC indemnification asset. Accretion or amortization of the FDIC indemnification asset is recognized in earnings using the effective interest method over the period during which cash flows from the FDIC are expected to be collected, which is limited to the lesser of the contractual term of the indemnification agreement and the remaining life of the indemnified assets.

Gains and losses from resolution of ACI loans are included in the income statement line item "Income from resolution of covered assets, net." These gains and losses represent the difference between the expected losses from ACI loans and consideration actually received in satisfaction of such loans that were resolved either by payment in full, foreclosure or short sale. The Company may also realize gains or losses on the sale or impairment of covered loans or covered OREO. When the Company recognizes gains or losses related to the resolution, sale or impairment of covered assets in earnings, corresponding changes in the estimated amount recoverable from the FDIC under the Loss Sharing Agreements are reflected in the consolidated financial statements as increases or decreases in the FDIC indemnification asset and in the consolidated statement of income line item "Net loss on FDIC indemnification."

The FDIC indemnification asset was amortized to zero as of December 31, 2018 as expectations of losses eligible for indemnification with respect to the remaining covered assets prior to final termination of the Single Family Shared-Loss Agreement were insignificant. See Notes 4 and 5 to our consolidated financial statements for further discussion.

Bank Owned Life Insurance

Bank owned life insurance is carried at the amount that could be realized under the contract at the balance sheet date, which is typically cash surrender value. Changes in cash surrender value are recorded in non-interest income.

Equipment Under Operating Lease

Equipment under operating lease is carried at cost less accumulated depreciation and is depreciated to estimated residual value using the straight-line method over the lease term. Estimated residual values are re-evaluated at least annually, based primarily on current residual value appraisals. Rental revenue is recognized on a straight-line basis over the contractual term of the lease.

A review for impairment of equipment under operating lease is performed at least annually or when events or changes in circumstances indicate that the carrying amount of long-lived assets may not be recoverable. Impairment of assets is determined by comparing the carrying amount to future undiscounted net cash flows expected to be generated. If an asset is impaired, the measure of impairment is the amount by which the carrying amount exceeds the fair value of the asset.

Goodwill

Goodwill of $78 million at both December 31, 2018 and 2017 represents the excess of consideration transferred in business combinations over the fair value of net tangible and identifiable intangible assets acquired. Goodwill is not amortized, but is tested for impairment annually or more frequently if events or circumstances indicate that impairment may have occurred. The Company performs its annual goodwill impairment test in the third fiscal quarter. The Company has a single reporting unit. The impairment test compares the estimated fair value of the reporting unit to its carrying amount. If the fair value of the reporting unit exceeds its carrying amount, no impairment is indicated. If the fair value of the reporting unit is less than its carrying amount, impairment of goodwill is measured as the excess of the carrying amount over fair value. The estimated fair value of the reporting unit is based on the market capitalization of the Company's common stock. The estimated fair value of the reporting unit at each impairment testing date substantially exceeded its carrying amount; therefore, no impairment of goodwill was indicated.

Foreclosed Property and Repossessed Assets

Foreclosed property and repossessed assets consists of real estate assets acquired through, or in lieu of, loan foreclosure and personal property acquired through repossession. Such assets are included in other assets in the accompanying consolidated balance sheets. These assets are held for sale and are initially recorded at estimated fair value less costs to sell, establishing a new cost basis. Subsequent to acquisition, periodic valuations are performed and the assets are carried at the lower of the carrying amount at the date of acquisition or estimated fair value less cost to sell. Significant property improvements are capitalized to the extent that the resulting carrying value does not exceed fair value less cost to sell. Legal fees, maintenance, taxes, insurance and other direct costs of holding and maintaining these assets are expensed as incurred.

Premises and Equipment

Premises and equipment are carried at cost less accumulated depreciation and amortization and are included in other assets in the accompanying consolidated balance sheets. Depreciation is calculated using the straight-line method over the estimated useful lives of the assets. The lives of improvements to existing buildings are based on the lesser of the estimated remaining lives of the buildings or the estimated useful lives of the improvements. Leasehold improvements are amortized over the shorter of the expected terms of the leases at inception, considering options to extend that are reasonably assured, or their useful lives. The estimated useful lives of premises and equipment are as follows:


•	buildings and improvements - 30 years;


•	leasehold improvements - 5 to 20 years;


•	furniture, fixtures and equipment - 5 to 7 years; and


•	computer equipment - 3 to 5 years.

Software and CCA

Software and CCA are carried at cost less accumulated depreciation and amortization and are included in other assets in the accompanying consolidated balance sheets. Depreciation is calculated using the straight-line method over the estimated useful lives of the assets. Direct costs of materials and services associated with developing or obtaining and implementing internal use computer software incurred during the application and development stage are capitalized and amortized over the estimated useful lives of the software. The estimated useful life of software, software licensing rights and CCA implementation costs range from 3 to 5 years.

Loan Servicing Rights

Loan servicing rights are measured at fair value, with changes in fair value subsequent to acquisition recognized in earnings. Loan servicing rights are included in other assets in the accompanying consolidated balance sheets. Servicing fee income is recorded net of changes in fair value in other non-interest income. Neither the loan servicing rights nor related income have had a material impact on the Company's financial statements to date.

Investments in Affordable Housing Limited Partnerships

The Company has acquired investments in limited partnerships that manage or invest in qualified affordable housing projects and provide the Company with low-income housing tax credits and other tax benefits. These investments are included in other assets in the accompanying consolidated balance sheets. The Company accounts for investments in qualified affordable housing projects using the proportional amortization method if certain criteria are met. Under the proportional amortization method, the initial cost of the investment is amortized in proportion to the tax credits and other tax benefits received and the amortization is recognized in the income statement as a component of income tax expense. The investments are evaluated for impairment when events or changes in circumstances indicate that it is more likely than not that the carrying amount of the investment will not be realized.

Income Taxes

The Company accounts for income taxes using the asset and liability method. Deferred tax assets and liabilities are determined based on differences between the financial reporting and tax bases of assets and liabilities using enacted tax rates in effect for periods in which the differences are expected to reverse. The effect of changes in tax rates on deferred tax assets and liabilities are recognized in income in the period that includes the enactment date. A valuation allowance is established for deferred tax assets when management determines that it is more likely than not that some portion or all of a deferred tax asset will not be realized. In making such determinations, the Company considers all available positive and negative evidence that may impact the realization of deferred tax assets. These considerations include the amount of taxable income generated in statutory carryback periods, future reversals of existing taxable temporary differences, projected future taxable income and available tax planning strategies.

The Company recognizes tax benefits from uncertain tax positions when it is more likely than not that the related tax positions will be sustained upon examination, including resolutions of any related appeals or litigation processes, based on the technical merits of the tax positions. An uncertain tax position is a position taken in a previously filed tax return or a position expected to be taken in a future tax return that is not based on clear and unambiguous tax law. The Company measures tax benefits related to uncertain tax positions based on the largest benefit that has a greater than 50% likelihood of being realized upon settlement. If the initial assessment fails to result in recognition of a tax benefit, the Company subsequently recognizes a tax benefit if (i) there are changes in tax law or case law that raise the likelihood of prevailing on the technical merits of the position to more-likely-than-not, (ii) the statute of limitations expires, or (iii) there is a completion of an examination resulting in a settlement of that tax year or position with the appropriate agency. The Company recognizes interest and penalties related to uncertain tax positions, as well as interest income or expense related to tax settlements, in the provision for income taxes.

Equity Based Compensation

The Company periodically grants unvested or restricted shares of common stock and other share-based awards to key employees. For equity classified awards, compensation cost is measured based on the estimated fair value of the awards at the grant date and is recognized in earnings on a straight-line basis over the requisite service period for each award. Liability-classified awards are remeasured each reporting period at fair value until the award is settled, and compensation cost is recognized in earnings on a straight-line basis over the requisite service period for each award, adjusted for changes in fair value each reporting period. Compensation cost related to awards that embody performance conditions is recognized when it is probable that the performance conditions will be achieved. The number of awards expected to vest is estimated in determining the amount of compensation cost to be recognized related to share-based payment transactions.

The fair value of unvested shares is based on the closing market price of the Company's common stock at the date of grant. Market conditions embedded in awards are reflected in the grant-date fair value of the awards.

Derivative Financial Instruments and Hedging Activities

Interest rate derivative contracts

The Company uses interest rate derivative contracts, such as swaps, caps, floors and collars, in the normal course of business to meet the financial needs of its customers and to manage exposure to changes in interest rates. Interest rate contracts are recorded as assets or liabilities in the consolidated balance sheets at fair value. Interest rate swaps that are used as a risk management tool to hedge the Company's exposure to changes in interest rates have been designated as cash flow hedging instruments. The gain or loss resulting from changes in the fair value of interest rate swaps designated and qualifying as cash flow hedging instruments is initially reported as a component of other comprehensive income and subsequently reclassified into earnings in the same period in which the hedged transaction affects earnings.

The Company discontinues hedge accounting prospectively when it is determined that the derivative is no longer effective in offsetting changes in the cash flows of the hedged item, the derivative expires or is sold, terminated, or exercised, management determines that the designation of the derivative as a hedging instrument is no longer appropriate or the occurrence of the forecasted transaction is no longer probable. When hedge accounting is discontinued, any subsequent changes in fair value of the derivative are recognized in earnings. The cumulative unrealized gain or loss related to a discontinued cash flow hedge continues to be reported in AOCI and is subsequently reclassified into earnings in the same period in which the hedged transaction affects earnings, unless it is probable that the forecasted transaction will not occur by the end of the originally specified time period, in which case the cumulative unrealized gain or loss reported in AOCI is reclassified into earnings immediately.

Cash flows resulting from derivative financial instruments that are accounted for as hedges are classified in the cash flow statement in the same category as the cash flows from the hedged items.

Changes in the fair value of interest rate contracts not designated as, or not qualifying as, hedging instruments are recognized currently in earnings.

Transfers of Financial Assets

Transfers of financial assets are accounted for as sales when control over the assets has been surrendered. A gain or loss is recognized in earnings upon completion of the sale based on the difference between the sales proceeds and the carrying value of the assets. Control over the transferred assets is deemed to have been surrendered when: (i) the assets have been legally isolated from the Company, (ii) the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and (iii) the Company does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity or the ability to unilaterally cause the holder to return specific assets.

Advertising Costs

Advertising costs are expensed as incurred.

Earnings per Common Share

Basic earnings per common share is calculated by dividing income allocated to common stockholders for basic earnings per common share by the weighted average number of common shares outstanding for the period, reduced by average unvested stock awards. Unvested stock awards with non-forfeitable rights to dividends, whether paid or unpaid, and stand-alone dividend participation rights are considered participating securities and are included in the computation of basic earnings per common share using the two class method whereby net income is allocated between common stock and participating securities. In periods of a net loss, no allocation is made to participating securities as they are not contractually required to fund net losses. Diluted earnings per common share is computed by dividing income allocated to common stockholders for basic earnings per common share, adjusted for earnings reallocated from participating securities, by the weighted average number of common shares outstanding for the period increased for the dilutive effect of unexercised stock options, warrants and unvested stock awards using the treasury stock method. Contingently issuable shares are included in the calculation of earnings per common share as if the end of the respective period was the end of the contingency period.

Revenue From Contracts with Customers

Revenue from contracts with customers within the scope of Topic 606 "Revenue from Contracts with Customers", is recognized in an amount that reflects the consideration the Company expects to be entitled to receive in exchange for those goods or services as the related performance obligations are satisfied. The majority of our revenues, including revenues from loans, leases, investment securities, derivative instruments and letters of credit and from transfers and servicing of financial assets, are excluded from the scope of Topic 606. Deposit service charges and fees is the most significant category of revenue within the scope of the standard. These service charges and fees consist primarily of monthly maintenance fees and other transaction based fees. Revenue is recognized when our performance obligations are complete, generally monthly for account maintenance fees or when a transaction, such as a wire transfer, is completed. Payment is typically received at the time the performance obligation is satisfied. The aggregate amount of revenue that is within the scope of Topic 606 from sources other than deposit service charges and fees is not material.

Reclassifications

Certain amounts presented for prior periods have been reclassified to conform to the current period presentation.

New Accounting Pronouncements Adopted in 2018

ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), superseded the revenue recognition requirements in Topic 605, Revenue Recognition, and most industry-specific revenue recognition guidance throughout the Accounting Standards Codification. The amendments in this update affect any entity that either enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of non-financial assets unless those contracts are within the scope of other standards. The amendments establish a core principle requiring the recognition of revenue to depict the transfer of goods or services to customers in an amount reflecting the consideration to which the entity expects to be entitled in exchange for such goods or services and require expanded disclosure about revenue from contracts with customers that are within the scope of the standard. Revenue from financial instruments and lease contracts are generally outside the scope of Topic 606 as are revenues that are in the scope of ASC 860 "Transfers and Servicing", ASC 460 "Guarantees" and ASC 815 "Derivatives and Hedging". The Company adopted this standard in the first quarter of 2018 with respect to contracts not completed on the date of adoption using the modified retrospective transition method. Substantially all of the Company's revenues are generated from activities outside the scope of Topic 606; existing revenue recognition policies for contracts with customers that are within the scope of the standard are consistent with the principles in Topic 606. Therefore, there was no impact at adoption to the Company's consolidated financial position, results of operations, or cash flows.

ASU No. 2016-01, Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. The amendments in the ASU addressed certain aspects of recognition, measurement, presentation and disclosure of certain financial instruments. The main provisions of this ASU that are applicable to the Company are to (1) eliminate the available for sale classification for equity securities and require investments in equity securities (except those accounted for under the equity method of accounting or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income, provided that equity investments that do not have readily determinable fair values may be re-measured at fair value upon occurrence of an observable price change or recognition of impairment, (2) eliminate the requirement to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet, and (3) require public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes. The amendments also clarified that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available for sale securities in combination with the entity's other deferred tax assets, which is consistent with the Company's previous practice. The Company adopted this ASU in the first quarter of 2018 using the modified retrospective transition method. The cumulative effect adjustment to reclassify unrealized gains on equity securities from AOCI to retained earnings totaled $2.2 million, net of tax, at adoption.

ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments. This amendment provided guidance on eight specific cash flow classification issues where there had been diversity in practice. The provisions of this ASU that are expected to be applicable to the Company include requirements to: (1) classify cash payments for debt prepayment or extinguishment costs to be classified as cash outflows for financing activities, (2) classify proceeds from settlement of insurance claims on the basis of the nature of the loss and (3) require cash payments from settlement of bank-owned life insurance policies to be classified as cash flows from investing activities. The Company adopted this ASU for the first quarter of 2018; the provisions of the ASU were generally consistent with the Company's existing practice, therefore, adoption did not have an impact on the Company's consolidated cash flows.

ASU No. 2018-02, Income Statement-Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. The amendments in this ASU allowed a reclassification from AOCI to retained earnings of stranded tax effects in AOCI resulting from enactment of the TCJA that reduced the statutory federal tax rate from 35 percent to 21 percent. The Company’s existing accounting policy was to release stranded tax effects only when the entire portfolio of the type of item that created them is liquidated. This ASU was early adopted effective January 1, 2018 and a cumulative-effect adjustment was recorded to reclassify stranded tax effects totaling $11.1 million from AOCI to retained earnings.

ASU No. 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement. The amendments in this ASU modified the disclosure requirements on fair value measurements by removing certain disclosures not considered cost beneficial, clarifying certain disclosure requirements and adding some additional disclosures. The provisions of the ASU that are applicable to the fair value disclosures of the Company include: (1) adding disclosure of the changes in unrealized gains and losses for the period included in other comprehensive income for recurring level 3 fair value measurements, (2) adding the range and weighted average of significant unobservable inputs used to develop level 3 fair value measurements, (3) removing the requirement to disclose the amount of and reasons for transfers between level 1 and level 2 of the fair value hierarchy, (4) removing the requirement to disclose the policy for timing of transfers between levels of the fair value hierarchy, and (5) removing disclosure of the valuation processes for level 3 fair value measurements. The Company early adopted this ASU for the third quarter of 2018.

ASU No. 2018-15, Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract (a consensus of the FASB Emerging Issues Task Force). The amendments in this ASU require customers in a cloud computing arrangement (i.e., hosting arrangement) that is a service contract to capitalize certain implementation costs in the same manner as software developed for internal use. The guidance allows for qualifying costs incurred during the application and development stage to be capitalized, which may include: (1) integration, (2) customization, (3) configuration, (4) installation, (5) architecture and design, (6) coding, and (7) testing. Capitalized implementation costs related to a hosting arrangement that is a service contract will be amortized over the term of the hosting arrangement, beginning when the applicable component of the hosting arrangement is ready for its intended use. The accounting for the cost of the hosting component of the arrangement is not affected by this ASU. The Company early adopted this ASU in the third quarter of 2018 using the prospective transition approach with no significant impact to the Company's consolidated financial position, results of operations, or cash flows.

Accounting Pronouncements Not Yet Adopted

ASU No. 2016-02, Leases (Topic 842). The amendments in this ASU require a lessee to recognize in the statement of financial position a liability to make lease payments and a right-of-use asset representing its right to use the underlying asset for leases with terms longer than one year. Accounting applied by lessors is largely unchanged by this ASU. The ASU also will require both qualitative and quantitative disclosures that provide additional information about the amounts recorded in the consolidated financial statements. The amendments in this ASU are effective for the Company for interim and annual periods in fiscal years beginning after December 15, 2018. Early adoption is permitted; however, the Company did not early adopt this ASU. The most significant impact of adoption is expected to be the recognition, as lessee, of new right-of-use assets and lease liabilities on the Consolidated Balance Sheet for real estate leases currently classified as operating leases. Under a package of practical expedients that the Company plans to elect, the Company will not be required to (i) re-assess whether expired or existing contracts contain leases, (ii) re-assess the classification of expired or existing leases, (iii) re-evaluate initial direct costs for existing leases or (iv) separate lease components of certain contracts from non-lease components. The Company also plans to elect the transition method that allows entities the option of applying the provisions of the ASU at the effective date without adjusting the comparative periods presented. Management has finalized its evaluation of the impact of adoption of this ASU on its processes and controls. The Company has completed its review of contractual arrangements for embedded leases. The Company has acquired and implemented software to facilitate calculation and reporting of the lease liability and right-of-use asset. Relevant accounting policy decisions have been made including use of the incremental borrowing rate to determine the discount rate and assumptions around inclusion of renewals in lease terms. Based on the population of lease contracts existing at December 31, 2018 and an incremental borrowing rate determined as of that date, the Company recognized a lease liability and related right-of-use asset of approximately $104 million and $95 million, respectively, on adoption at January 1, 2019. The Company does not expect the impact of adoption to be material to its consolidated results of operations or cash flows.

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326); Measurement of Credit Losses on Financial Instruments. The ASU introduces new guidance which makes substantive changes to the accounting for credit losses. The ASU introduces the CECL model which applies to financial assets subject to credit losses and measured at amortized cost, as well as certain off-balance sheet credit exposures. This includes loans, loan commitments, standby letters of credit, net investments in leases recognized by a lessor and HTM debt securities. The CECL model requires an entity to estimate credit losses expected over the life of an exposure, considering information about historical events, current conditions and reasonable and supportable forecasts, and is generally expected to result in earlier recognition of credit losses. The ASU also modifies certain provisions of the current OTTI model for AFS debt securities. Credit losses on AFS debt securities will be limited to the difference between the security's amortized cost basis and its fair value, and be recognized through an allowance for credit losses rather than as a direct reduction in amortized cost basis. The ASU also provides for a simplified accounting model for purchased financial assets with more than insignificant credit deterioration since their origination. The ASU requires expanded disclosures including, but not limited to (i) information about the methods and assumptions used to estimate expected credit losses, including changes in the factors that influenced management's estimate and the reasons for those changes, (ii) for financing receivables and net investment in leases measured at amortized cost, further disaggregation of information about the credit quality of those assets and (iii) a rollforward of the allowance for credit losses for AFS and HTM securities. The amendments in this ASU are effective for the Company for interim and annual periods in fiscal years beginning after December 15, 2019. Early adoption is permitted, however, the Company does not intend to early adopt this ASU. Management is in the process of evaluating the impact of adoption of this ASU on its consolidated financial statements, processes and controls and is not currently able to reasonably estimate the impact of adoption on the Company's consolidated financial position, results of operations or cash flows; however, adoption is likely to lead to significant changes in accounting policies related to, and the methods employed in estimating, the ALLL. It is possible that the impact will be material to the Company's consolidated financial position and results of operations. To date, the Company has completed a gap analysis, adopted a detailed implementation plan, established a formal governance structure for the project, documented accounting policy elections, selected and implemented credit loss models for key portfolio segments and in the process of completing model validations, chosen loss estimation methodologies for key portfolio segments, selected a software solution to serve as its CECL platform. The Company has also established an economic forecast committee, and is in the process of documenting processes and controls.

In October 2018, the FASB issued ASU No. 2018-16, Derivatives and Hedging (Topic 815): Inclusion of the Secured Overnight Financing Rate (SOFR) Overnight Index Swap (OIS) Rate as a Benchmark Interest Rate for Hedge Accounting Purposes. The ASU adds the Overnight Index Swap (OIS) rate based on Secured Overnight Financing Rate (SOFR) as a benchmark interest rate for hedge accounting purposes. The ASU is effective for the Company for interim and annual periods in fiscal years beginning after December 15, 2018. The Company does not expect the impact of adoption to be material to its consolidated financial position, results of operations, or cash flows.

Earnings Per Common Share

12 Months Ended

Dec. 31, 2018

Earnings Per Share [Abstract]

Earnings Per Common Share

The computation of basic and diluted earnings per common share is presented below for the years ended December 31, 2018, 2017 and 2016 (in thousands, except share and per share data):



c	2018			2017			2016
Basic earnings per common share:
Numerator:
Net income	$	324,866		$	614,273		$	225,741
Distributed and undistributed earnings allocated to participating securities	(13,047		)	(23,250		)	(8,760		)
Income allocated to common stockholders for basic earnings per common share	$	311,819		$	591,023		$	216,981
Denominator:
Weighted average common shares outstanding	104,916,865			106,574,448			104,097,182
Less average unvested stock awards	(1,171,994		)	(1,104,035		)	(1,157,378		)
Weighted average shares for basic earnings per common share	103,744,871			105,470,413			102,939,804
Basic earnings per common share	$	3.01		$	5.60		$	2.11
Diluted earnings per common share:
Numerator:
Income allocated to common stockholders for basic earnings per common share	$	311,819		$	591,023		$	216,981
Adjustment for earnings reallocated from participating securities	(195		)	(263		)	62
Income used in calculating diluted earnings per common share	$	311,624		$	590,760		$	217,043
Denominator:
Weighted average shares for basic earnings per common share	103,744,871			105,470,413			102,939,804
Dilutive effect of stock options	332,505			387,074			716,366
Weighted average shares for diluted earnings per common share	104,077,376			105,857,487			103,656,170
Diluted earnings per common share	$	2.99		$	5.58		$	2.09

Included in participating securities above are unvested shares and 3,023,314 dividend equivalent rights outstanding at December 31, 2018 that were issued in conjunction with the IPO of the Company's common stock. These dividend equivalent rights expire in 2021 and participate in dividends on a one-for-one basis.

The following potentially dilutive securities were outstanding at December 31, 2018, 2017 and 2016 but excluded from the calculation of diluted earnings per common share for the periods indicated because their inclusion would have been anti-dilutive:



	2018	2017	2016
Unvested shares and share units	1,463,607	1,431,761	1,303,208
Stock options and warrants	1,960	1,850,279	1,850,279

Investment Securities

12 Months Ended

Dec. 31, 2018

Investments, Debt and Equity Securities [Abstract]

Investment Securities

Investment securities include investment securities available for sale, marketable equity securities, and investment securities held to maturity. The investment securities portfolio consisted of the following at December 31, 2018 and 2017 (in thousands):



	2018
	Amortized Cost		Gross Unrealized					Carrying Value ⁽¹⁾
	Amortized Cost		Gains		Losses			Carrying Value ⁽¹⁾
Investment securities available for sale:
U.S. Treasury securities	$	39,885	$	2	$	(14	)	$	39,873
U.S. Government agency and sponsored enterprise residential MBS	1,885,302		16,580		(4,408		)	1,897,474
U.S. Government agency and sponsored enterprise commercial MBS	374,569		1,293		(1,075		)	374,787
Private label residential MBS and CMOs	1,539,058		10,138		(14,998		)	1,534,198
Private label commercial MBS	1,486,835		5,021		(6,140		)	1,485,716
Single family rental real estate-backed securities	406,310		266		(4,118		)	402,458
Collateralized loan obligations	1,239,355		1,060		(5,217		)	1,235,198
Non-mortgage asset-backed securities	204,372		1,031		(1,336		)	204,067
State and municipal obligations	398,810		3,684		(4,065		)	398,429
SBA securities	514,765		6,502		(1,954		)	519,313
Other debt securities	1,393		3,453		—			4,846
	8,090,654		$	49,030	$	(43,325	)	8,096,359
Marketable equity securities	60,519							60,519
Investment securities held to maturity	10,000							10,000
	$	8,161,173						$	8,166,878



	2017
	Amortized Cost		Gross Unrealized					Carrying Value ⁽¹⁾
	Amortized Cost		Gains		Losses			Carrying Value ⁽¹⁾
Investment securities available for sale:
U.S. Treasury securities	$	24,981	$	—	$	(28	)	$	24,953
U.S. Government agency and sponsored enterprise residential MBS	2,043,373		16,094		(1,440		)	2,058,027
U.S. Government agency and sponsored enterprise commercial MBS	233,522		1,330		(344		)	234,508
Private label residential MBS and CMOs	613,732		16,473		(1,958		)	628,247
Private label commercial MBS	1,033,022		13,651		(258		)	1,046,415
Single family rental real estate-backed securities	559,741		3,823		(858		)	562,706
Collateralized loan obligations	720,429		3,252		—			723,681
Non-mortgage asset-backed securities	119,939		1,808		—			121,747
Marketable equity securities	59,912		3,631		—			63,543
State and municipal obligations	640,511		17,606		(914		)	657,203
SBA securities	534,534		16,208		(60		)	550,682
Other debt securities	4,090		5,030		—			9,120
	6,587,786		$	98,906	$	(5,860	)	6,680,832
Investment securities held to maturity	10,000							10,000
	$	6,597,786						$	6,690,832


(1)	At fair value except for securities held to maturity.

Investment securities held to maturity at December 31, 2018 and 2017 consisted of one State of Israel bond with a carrying value of $10 million maturing in 2024.

At December 31, 2018, contractual maturities of investment securities available for sale, adjusted for anticipated prepayments of mortgage-backed and other pass-through securities, were as follows (in thousands):



	Amortized Cost		Fair Value
Due in one year or less	$	939,802	$	942,507
Due after one year through five years	4,097,200		4,097,966
Due after five years through ten years	2,662,298		2,662,649
Due after ten years	391,354		393,237
	$	8,090,654	$	8,096,359

Based on the Company’s assumptions, the estimated weighted average life of the investment portfolio as of December 31, 2018 was 4.5 years. The effective duration of the investment portfolio as of December 31, 2018 was 1.4 years. The model results are based on assumptions that may differ from actual results.

The carrying value of securities pledged as collateral for FHLB advances, public deposits, interest rate swaps and to secure borrowing capacity at the FRB totaled $2.1 billion and $2.6 billion at December 31, 2018 and 2017, respectively.

The following table provides information about gains and losses on investment securities for the years ended December 31, 2018, 2017 and 2016 (in thousands):



	2018			2017			2016
Proceeds from sale of investment securities available for sale	$	1,030,810		$	1,287,591		$	1,127,983

Gross realized gains:
Investment securities available for sale	$	8,616		$	37,530		$	14,924
Gross realized losses:
Investment securities available for sale	(2,514		)	(4,064		)	—
Net realized gain	6,102			33,466			14,924

Net unrealized losses on marketable equity securities recognized in earnings	(2,943		)	—			—

OTTI on investment securities available for sale	—			—			(463		)

Gain on investment securities, net	$	3,159		$	33,466		$	14,461

During the year ended December 31, 2016, OTTI was recognized on two positions in one private label commercial MBS. These positions were sold at a loss before the end of 2016.

The following tables present the aggregate fair value and the aggregate amount by which amortized cost exceeded fair value for investment securities available for sale in unrealized loss positions, aggregated by investment category and length of time that individual securities had been in continuous unrealized loss positions at December 31, 2018 and 2017 (in thousands):



	2018
	Less than 12 Months					12 Months or Greater					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
U.S. Treasury securities	$	14,921	$	(14	)	$	—	$	—		$	14,921	$	(14	)
U.S. Government agency and sponsored enterprise residential MBS	450,666		(1,828		)	87,311		(2,580		)	537,977		(4,408		)
U.S. Government agency and sponsored enterprise commercial MBS	146,096		(352		)	25,815		(723		)	171,911		(1,075		)
Private label residential MBS and CMOs	759,921		(7,073		)	278,108		(7,925		)	1,038,029		(14,998		)
Private label commercial MBS	742,092		(5,371		)	39,531		(769		)	781,623		(6,140		)
Single family rental real estate-backed securities	234,305		(1,973		)	85,282		(2,145		)	319,587		(4,118		)
Collateralized loan obligations	749,047		(5,217		)	—		—			749,047		(5,217		)
Non-mortgage asset-backed securities	136,100		(1,336		)	—		—			136,100		(1,336		)
State and municipal obligations	208,971		(3,522		)	46,247		(543		)	255,218		(4,065		)
SBA securities	215,975		(1,391		)	31,481		(563		)	247,456		(1,954		)
	$	3,658,094	$	(28,077	)	$	593,775	$	(15,248	)	$	4,251,869	$	(43,325	)



	2017
	Less than 12 Months					12 Months or Greater					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
U.S. Treasury securities	$	24,953	$	(28	)	$	—	$	—		$	24,953	$	(28	)
U.S. Government agency and sponsored enterprise residential MBS	471,120		(1,141		)	13,028		(299		)	484,148		(1,440		)
U.S. Government agency and sponsored enterprise commercial MBS	26,265		(344		)	—		—			26,265		(344		)
Private label residential MBS and CMOs	330,068		(1,858		)	5,083		(100		)	335,151		(1,958		)
Private label commercial MBS	81,322		(258		)	—		—			81,322		(258		)
Single family rental real estate-backed securities	94,750		(858		)	—		—			94,750		(858		)
State and municipal obligations	30,715		(49		)	60,982		(865		)	91,697		(914		)
SBA securities	21,300		(10		)	15,427		(50		)	36,727		(60		)
	$	1,080,493	$	(4,546	)	$	94,520	$	(1,314	)	$	1,175,013	$	(5,860	)

The Company monitors its investment securities available for sale for OTTI on an individual security basis. No securities were determined to be other-than-temporarily impaired during the years ended December 31, 2018 or 2017. As discussed above, OTTI was recognized on two positions in one private label commercial MBS during the year ended December 31, 2016. The Company does not intend to sell securities that are in significant unrealized loss positions at December 31, 2018 and it is not more likely than not that the Company will be required to sell these securities before recovery of the amortized cost basis, which may be at maturity. At December 31, 2018, 218 securities were in unrealized loss positions. The amount of impairment related to 53 of these securities was considered insignificant both individually and in the aggregate, totaling approximately $596 thousand and no further analysis with respect to these securities was considered necessary. The basis for concluding that impairment of the remaining securities was not other-than-temporary is further described below

U.S. Government agency and sponsored enterprise residential and commercial MBS

At December 31, 2018, thirty-six U.S. Government agency and sponsored enterprise residential MBS and seven U.S. Government agency and sponsored enterprise commercial MBS were in unrealized loss positions. Impairment of these securities was primarily attributable to increases in market interest rates subsequent to the date of acquisition. The timely payment of principal and interest on these securities is explicitly or implicitly guaranteed by the U.S. Government. Given the expectation of timely payment of principal and interest the impairments were considered to be temporary.

Private label residential MBS and CMOs

At December 31, 2018, thirty-eight private label residential MBS and CMOs were in unrealized loss positions, primarily as a result of an increase in medium and long-term market interest rates subsequent to acquisition. These securities were assessed for OTTI using credit and prepayment behavioral models that incorporate CUSIP level constant default rates, voluntary prepayment rates and loss severity and delinquency assumptions. The results of these assessments were not indicative of credit losses related to any of these securities as of December 31, 2018. Given the expectation of timely recovery of outstanding principal the impairments were considered to be temporary.

Private label commercial MBS

At December 31, 2018, twenty-seven private label commercial MBS were in unrealized loss positions, primarily as a result of an increase in market interest rates. These securities were assessed for OTTI using credit and prepayment behavioral models incorporating assumptions consistent with the collateral characteristics of each security. The results of this analysis were not indicative of expected credit losses. Given the expectation of timely recovery of outstanding principal the impairments were considered to be temporary.

Single family rental real estate-backed securities

At December 31, 2018, thirteen single family rental real estate-backed securities were in unrealized loss positions. The unrealized losses were primarily due to increases in market interest rates since the purchase of the securities. Management's analysis of the credit characteristics, including loan-to-value and debt service coverage ratios, and levels of subordination for each of the securities is not indicative of projected credit losses. Given the absence of projected credit losses the impairments were considered to be temporary.

Collateralized loan obligations:

At December 31, 2018, eighteen collateralized loan obligations were in unrealized loss positions, primarily due to widening credit spreads. The amount of impairment of each of the individual securities was 3% or less of amortized cost. These securities were assessed for OTTI using credit and prepayment behavioral models incorporating assumptions consistent with the collateral characteristics of each security. The results of this analysis were not indicative of expected credit losses. Given the limited severity of impairment and the expectation of timely recovery of outstanding principal, the impairments were considered to be temporary.

Non-mortgage asset-backed securities

At December 31, 2018, six non-mortgage asset-backed securities were in unrealized loss positions, due primarily to increases in market interest rates subsequent to the date of acquisition. The amount of impairment each of the individual securities was less than 3% of amortized cost. These securities were assessed for OTTI using credit and prepayment behavioral models incorporating assumptions consistent with the collateral characteristics of each security. The results of this analysis were not indicative of expected credit losses. Given the limited severity of impairment and the expectation of timely recovery of outstanding principal, the impairments were considered to be temporary.

State and municipal obligations

At December 31, 2018, fourteen state and municipal obligations were in unrealized loss positions. The impairments are primarily attributable to increases in market interest rates and changes in statutory tax rates. All of the securities are rated investment grade by nationally recognized statistical ratings organizations. Management's evaluation of these securities for OTTI also encompassed the review of credit scores and analysis provided by a third party firm specializing in the analysis and credit review of municipal securities. Given the absence of expected credit losses, the impairments were considered to be temporary.

SBA Securities

At December 31, 2018, six SBA securities were in unrealized loss positions. The amount of impairment of each of these securities was 3% or less of amortized cost. These securities were purchased at a premium and the impairment was attributable primarily to increased prepayment speeds. The timely payment of principal and interest on these securities is guaranteed by this U.S. Government agency. Given the limited severity of impairment and the expectation of timely payment of principal and interest, the impairments were considered to be temporary.

Loans and Allowance for Loan and Lease Losses

12 Months Ended

Dec. 31, 2018

Receivables [Abstract]

Loans and Allowance for Loan and Lease Losses

At December 31, 2018 and 2017, loans consisted of the following (dollars in thousands):



	2018
				Covered Loans								Percent of Total
	Non-Covered Loans			ACI		Non-ACI			Total			Percent of Total
Residential and other consumer:
1-4 single family residential	$	4,404,047		$	190,223	$	12,558		$	4,606,828		21.0	%
Government insured residential	265,701			—		—			265,701			1.2	%
Home equity loans and lines of credit	1,393			—		—			1,393			—	%
Other consumer loans	15,976			—		—			15,976			0.1	%
	4,687,117			190,223		12,558			4,889,898			22.3	%
Commercial:
Multi-family	2,583,331			—		—			2,583,331			11.8	%
Non-owner occupied commercial real estate	4,700,188			—		—			4,700,188			21.4	%
Construction and land	227,134			—		—			227,134			1.0	%
Owner occupied commercial real estate	2,122,381			—		—			2,122,381			9.7	%
Commercial and industrial	4,801,226			—		—			4,801,226			21.9	%
Commercial lending subsidiaries	2,608,834			—		—			2,608,834			11.9	%
	17,043,094			—		—			17,043,094			77.7	%
Total loans	21,730,211			190,223		12,558			21,932,992			100.0	%
Premiums, discounts and deferred fees and costs, net	45,421			—		(1,405		)	44,016
Loans including premiums, discounts and deferred fees and costs	21,775,632			190,223		11,153			21,977,008
Allowance for loan and lease losses	(109,901		)	—		(30		)	(109,931		)
Loans, net	$	21,665,731		$	190,223	$	11,123		$	21,867,077



	2017
				Covered Loans								Percent of Total
	Non-Covered Loans			ACI		Non-ACI			Total			Percent of Total
Residential and other consumer:
1-4 single family residential	$	4,089,994		$	479,068	$	27,198		$	4,596,260		21.5	%
Government insured residential	26,820			—		—			26,820			0.1	%
Home equity loans and lines of credit	1,654			—		—			1,654			—	%
Other consumer loans	20,512			—		—			20,512			0.1	%
	4,138,980			479,068		27,198			4,645,246			21.7	%
Commercial:
Multi-family	3,215,697			—		—			3,215,697			15.0	%
Non-owner occupied commercial real estate	4,485,276			—		—			4,485,276			21.0	%
Construction and land	310,999			—		—			310,999			1.5	%
Owner occupied commercial real estate	2,014,908			—		—			2,014,908			9.4	%
Commercial and industrial	4,145,785			—		—			4,145,785			19.4	%
Commercial lending subsidiaries	2,553,576			—		—			2,553,576			12.0	%
	16,726,241			—		—			16,726,241			78.3	%
Total loans	20,865,221			479,068		27,198			21,371,487			100.0	%
Premiums, discounts and deferred fees and costs, net	48,165			—		(3,148		)	45,017
Loans including premiums, discounts and deferred fees and costs	20,913,386			479,068		24,050			21,416,504
Allowance for loan and lease losses	(144,537		)	—		(258		)	(144,795		)
Loans, net	$	20,768,849		$	479,068	$	23,792		$	21,271,709

Included in non-covered loans above are $18 million and $34 million at December 31, 2018 and 2017, respectively, of ACI commercial loans acquired in the FSB Acquisition.

Through two subsidiaries, the Bank provides commercial and municipal equipment and franchise financing utilizing both loan and lease structures. At December 31, 2018 and 2017, the commercial lending subsidiaries portfolio included a net investment in direct financing leases of $739 million and $738 million, respectively.

The following table presents the components of the investment in direct financing leases as of December 31, 2018 and 2017 (in thousands):



	2018			2017
Total minimum lease payments to be received	$	808,921		$	792,064
Estimated unguaranteed residual value of leased assets	7,355			17,872
Gross investment in direct financing leases	816,276			809,936
Unearned income	(81,864		)	(76,900		)
Initial direct costs	4,833			5,184
	$	739,245		$	738,220

As of December 31, 2018, future minimum lease payments to be received under direct financing leases were as follows (in thousands):



Years Ending December 31:
2019	$	197,004
2020	169,437
2021	109,057
2022	69,242
2023	56,312
Thereafter	207,869
	$	808,921

During both of the years ended December 31, 2018 and 2017, the Company purchased 1-4 single family residential loans totaling $1.3 billion. Purchases for the year ended December 31, 2018 included $371 million of government insured residential loans.

At December 31, 2018, the Company had pledged real estate loans with UPB of approximately $9.8 billion and recorded investment of approximately $9.6 billion as security for FHLB advances.

Covered loans

Covered loans with UPB totaling $401 million and a carrying value of $201 million as of December 31, 2018 were retained in portfolio. During the years ended December 31, 2018, 2017 and 2016, the Company sold covered residential loans to third parties on a non-recourse basis. The following table summarizes the impact of these transactions (in thousands):



	2018		2017			2016
UPB of loans sold	$	539,853	$	203,970		$	241,348

Cash proceeds, net of transaction costs	$	488,972	$	169,828		$	171,367
Recorded investment in loans sold	483,240		152,422			185,837
Gain (loss) on sale of covered loans, net	$	5,732	$	17,406		$	(14,470	)

Gain (loss) on FDIC indemnification, net	$	3,388	$	(1,523	)	$	11,615

At December 31, 2018 and 2017, the UPB of ACI loans was $408 million and $1.1 billion, respectively. The accretable yield on ACI loans represents the amount by which undiscounted expected future cash flows exceed recorded investment. Changes in the accretable yield on ACI loans for the years ended December 31, 2018, 2017 and 2016 were as follows (in thousands):



Balance at December 31, 2015	$	902,565
Reclassifications from non-accretable difference	76,751
Accretion	(303,931		)
Balance at December 31, 2016	675,385
Reclassifications from non-accretable difference, net	81,501
Accretion	(301,827		)
Balance at December 31, 2017	455,059
Reclassifications from non-accretable difference, net	128,499
Accretion	(369,915		)
Other changes, net ⁽¹⁾	78,204
Balance at December 31, 2018	$	291,847


(1)	Represents changes in cash flows expected to be collected due to the impact of changes in prepayment assumptions.

Allowance for loan and lease losses

Activity in the ALLL for the years ended December 31, 2018, 2017 and 2016 is summarized in the tables below (in thousands):



	2018
	Residential and Other Consumer			Commercial			Total
Beginning balance	$	10,720		$	134,075		$	144,795
Provision for loan losses:
Covered loans	752			—			752
Non-covered loans	280			24,893			25,173
Total provision	1,032			24,893			25,925
Charge-offs:
Covered loans	(1,200		)	—			(1,200		)
Non-covered loans	(265		)	(65,619		)	(65,884		)
Total charge-offs	(1,465		)	(65,619		)	(67,084		)
Recoveries:
Covered loans	220			—			220
Non-covered loans	281			5,794			6,075
Total recoveries	501			5,794			6,295
Ending balance	$	10,788		$	99,143		$	109,931



	2017
	Residential and Other Consumer			Commercial			Total
Beginning balance	$	11,503		$	141,450		$	152,953
Provision for (recovery of) loan losses:
Covered loans	1,418			(60		)	1,358
Non-covered loans	1,034			66,355			67,389
Total provision	2,452			66,295			68,747
Charge-offs:
Covered loans	(3,327		)	—			(3,327		)
Non-covered loans	(1		)	(77,865		)	(77,866		)
Total charge-offs	(3,328		)	(77,865		)	(81,193		)
Recoveries:
Covered loans	67			60			127
Non-covered loans	26			4,135			4,161
Total recoveries	93			4,195			4,288
Ending balance	$	10,720		$	134,075		$	144,795



	2016
	Residential and Other Consumer			Commercial			Total
Beginning balance	$	16,211		$	109,617		$	125,828
Provision for (recovery of) loan losses:
Covered loans	(1,632		)	(49		)	(1,681		)
Non-covered loans	(1,814		)	54,406			52,592
Total provision	(3,446		)	54,357			50,911
Charge-offs:
Covered loans	(1,216		)	—			(1,216		)
Non-covered loans	(152		)	(25,742		)	(25,894		)
Total charge-offs	(1,368		)	(25,742		)	(27,110		)
Recoveries:
Covered loans	80			49			129
Non-covered loans	26			3,169			3,195
Total recoveries	106			3,218			3,324
Ending balance	$	11,503		$	141,450		$	152,953

The following table presents information about the balance of the ALLL and related loans as of December 31, 2018 and 2017 (in thousands):



	2018						2017
	Residential and Other Consumer		Commercial		Total		Residential and Other Consumer		Commercial		Total
Allowance for loan and lease losses:
Ending balance	$	10,788	$	99,143	$	109,931	$	10,720	$	134,075	$	144,795
Covered loans:
Ending balance	$	30	$	—	$	30	$	258	$	—	$	258
Ending balance: non-ACI loans individually evaluated for impairment	$	—	$	—	$	—	$	118	$	—	$	118
Ending balance: non-ACI loans collectively evaluated for impairment	$	30	$	—	$	30	$	140	$	—	$	140
Non-covered loans:
Ending balance	$	10,758	$	99,143	$	109,901	$	10,462	$	134,075	$	144,537
Ending balance: loans individually evaluated for impairment	$	134	$	12,143	$	12,277	$	63	$	18,776	$	18,839
Ending balance: loans collectively evaluated for impairment	$	10,624	$	87,000	$	97,624	$	10,399	$	115,299	$	125,698
Loans:
Covered loans:
Ending balance	$	201,376	$	—	$	201,376	$	503,118	$	—	$	503,118
Ending balance: non-ACI loans individually evaluated for impairment	$	—	$	—	$	—	$	2,221	$	—	$	2,221
Ending balance: non-ACI loans collectively evaluated for impairment	$	11,153	$	—	$	11,153	$	21,829	$	—	$	21,829
Ending balance: ACI loans	$	190,223	$	—	$	190,223	$	479,068	$	—	$	479,068
Non-covered loans:
Ending balance	$	4,747,604	$	17,028,028	$	21,775,632	$	4,196,080	$	16,717,306	$	20,913,386
Ending balance: loans, other than ACI loans, individually evaluated for impairment	$	7,690	$	108,841	$	116,531	$	1,234	$	173,706	$	174,940
Ending balance: loans, other than ACI loans, collectively evaluated for impairment	$	4,739,914	$	16,901,262	$	21,641,176	$	4,194,846	$	16,509,824	$	20,704,670
Ending balance: ACI loans	$	—	$	17,925	$	17,925	$	—	$	33,776	$	33,776

Credit quality information

The table below presents information about loans or ACI pools identified as impaired as of December 31, 2018 and 2017 (in thousands):



	2018						2017
	Recorded Investment		UPB		Related Specific Allowance		Recorded Investment		UPB		Related Specific Allowance
Non-covered loans:
With no specific allowance recorded:
1-4 single family residential ⁽¹⁾	$	5,724	$	5,605	$	—	$	120	$	122	$	—
Multi-family	25,560		25,592		—		—		—		—
Non-owner occupied commercial real estate	12,293		12,209		—		10,922		10,838		—
Construction and land	9,923		9,925		—		1,175		1,175		—
Owner occupied commercial real estate	9,007		9,024		—		22,002		22,025		—
Commercial and industrial
Taxi medallion loans	775		775		—		13,560		13,559		—
Other commercial and industrial	12,739		12,744		—		345		374		—
Commercial lending subsidiaries	3,152		3,149		—		—		—		—
With a specific allowance recorded:
1-4 single family residential ⁽¹⁾	1,966		1,941		134		1,114		1,090		63
Multi-family	—		—		—		23,173		23,175		1,732
Owner occupied commercial real estate	3,316		3,322		844		3,075		3,079		2,960
Non-owner occupied commercial real estate	1,666		1,667		731		—		—		—
Commercial and industrial
Taxi medallion loans	—		—		—		92,507		92,508		12,214
Other commercial and industrial	10,939		10,946		3,831		3,626		3,624		1,540
Commercial lending subsidiaries	19,471		19,385		6,737		3,321		3,296		330
Total:
Residential and other consumer	$	7,690	$	7,546	$	134	$	1,234	$	1,212	$	63
Commercial	108,841		108,738		12,143		173,706		173,653		18,776
	$	116,531	$	116,284	$	12,277	$	174,940	$	174,865	$	18,839
Covered loans:
Non-ACI loans:
With no specific allowance recorded:
1-4 single family residential	$	—	$	—	$	—	$	1,061	$	1,203	$	—
With a specific allowance recorded:
1-4 single family residential	—		—		—		1,160		1,314		118
	$	—	$	—	$	—	$	2,221	$	2,517	$	118


(1)	Includes government insured residential loans at December 31, 2018 and 2017.

Interest income recognized on impaired loans and pools was insignificant for the year ended December 31, 2018 and approximately $9.6 million for the year ended December 31, 2017.

The following table presents the average recorded investment in impaired loans for the years ended December 31, 2018, 2017 and 2016 (in thousands):



	2018				2017				2016
	Non-Covered Loans		Covered Non-ACI Loans		Non-Covered Loans		Covered Non-ACI Loans		Non-Covered Loans		Covered Non-ACI Loans
Residential and other consumer:
1-4 single family residential	$	4,910	$	1,743	$	868	$	2,345	$	301	$	3,067
Home equity loans and lines of credit	—		—		—		8,403		—		9,225
	4,910		$	1,743	868		$	10,748	301		$	12,292
Commercial:
Multi-family	25,679				4,259				—
Non-owner occupied commercial real estate	14,106				5,537				710
Construction and land	6,551				2,789				797
Owner occupied commercial real estate	16,207				19,882				14,645
Commercial and industrial
Taxi medallion loans	79,786				108,977				45,012
Other commercial and industrial	17,602				38,275				40,443
Commercial lending subsidiaries	9,757				22,865				15,052
	169,688				202,584				116,659
	$	174,598			$	203,452			$	116,960

In addition to the above, a pool of ACI home equity loans and lines of credit was impaired during 2017. All of the loans from this pool were sold in the fourth quarter of 2017. The average balance of impaired ACI home equity loans and lines of credit for the year ended December 31, 2017 was $3.9 million.

The following table presents the recorded investment in loans on non-accrual status as of December 31, 2018 and 2017 (in thousands):



	2018				2017
	Non-Covered Loans		Covered Non-ACI Loans		Non-Covered Loans		Covered Non-ACI Loans
Residential and other consumer:
1-4 single family residential	$	6,316	$	—	$	9,705	$	1,341
Other consumer loans	288		—		821		—
	6,604		$	—	10,526		$	1,341
Commercial:
Multi-family	25,560				—
Non-owner occupied commercial real estate	16,050				12,716
Construction and land	9,923				1,175
Owner occupied commercial real estate	19,789				29,020
Commercial and industrial
Taxi medallion loans	775				106,067
Other commercial and industrial	27,809				7,049
Commercial lending subsidiaries	22,733				3,512
	122,639				159,539
	$	129,243			$	170,065

Non-covered loans contractually delinquent by 90 days or more and still accruing totaled $0.7 million and $1.9 million at December 31, 2018 and 2017, respectively. The amount of additional interest income that would have been recognized on non-accrual loans had they performed in accordance with their contractual terms was approximately $5.0 million and $4.1 million for the years ended December 31, 2018 and 2017, respectively.

Management considers delinquency status to be the most meaningful indicator of the credit quality of 1-4 single family residential, home equity and consumer loans. Delinquency statistics are updated at least monthly. See "Aging of loans" below for more information on the delinquency status of loans. Original LTV and original FICO score are also important indicators of credit quality for the non-covered 1-4 single family residential portfolio.

Internal risk ratings are considered the most meaningful indicator of credit quality for commercial loans. Internal risk ratings are a key factor in identifying loans that are individually evaluated for impairment and impact management’s estimates of loss factors used in determining the amount of the ALLL. Internal risk ratings are updated on a continuous basis. Generally, relationships with balances in excess of defined thresholds, ranging from $1 million to $3 million, are re-evaluated at least annually and more frequently if circumstances indicate that a change in risk rating may be warranted. Loans exhibiting potential credit weaknesses that deserve management’s close attention and that if left uncorrected may result in deterioration of the repayment capacity of the borrower are categorized as special mention. Loans with well-defined credit weaknesses, including payment defaults, declining collateral values, frequent overdrafts, operating losses, increasing balance sheet leverage, inadequate cash flow, project cost overruns, unreasonable construction delays, past due real estate taxes or exhausted interest reserves, are assigned an internal risk rating of substandard. A loan with a weakness so severe that collection in full is highly questionable or improbable, but because of certain reasonably specific pending factors has not been charged off, will be assigned an internal risk rating of doubtful.

The following tables summarize key indicators of credit quality for the Company's loans as of December 31, 2018 and 2017. Amounts include premiums, discounts and deferred fees and costs (in thousands):

1-4 Single Family Residential credit exposure for non-covered loans, excluding government insured residential loans, based on original LTV and FICO score:



	2018
	FICO
LTV	720 or less		721 - 740		741 - 760		761 or greater		Total
60% or less	$	105,812	$	123,877	$	197,492	$	813,944	$	1,241,125
60% - 70%	120,982		109,207		170,531		597,659		998,379
70% - 80%	156,519		203,121		374,311		1,264,491		1,998,442
More than 80%	17,352		35,036		36,723		136,487		225,598
	$	400,665	$	471,241	$	779,057	$	2,812,581	$	4,463,544



	2017
	FICO
LTV	720 or less		721 - 740		741 - 760		761 or greater		Total
60% or less	$	91,965	$	117,318	$	185,096	$	815,792	$	1,210,171
60% - 70%	100,866		103,387		147,541		590,493		942,287
70% - 80%	149,209		183,064		324,884		1,139,902		1,797,059
More than 80%	16,116		30,408		28,149		121,689		196,362
	$	358,156	$	434,177	$	685,670	$	2,667,876	$	4,145,879

Commercial credit exposure, based on internal risk rating:



	2018
									Commercial and Industrial				Commercial Lending Subsidiaries
	Multi-Family		Non-Owner Occupied Commercial Real Estate		Construction and Land		Owner Occupied Commercial Real Estate		Taxi Medallion Loans		Other Commercial and Industrial		Pinnacle		Bridge		Total
Pass	$	2,547,835	$	4,611,029	$	216,917	$	2,077,611	$	—	$	4,706,666	$	1,462,655	$	1,105,821	$	16,728,534
Special mention	2,932		16,516		—		13,368		—		38,097		—		10,157		81,070
Substandard	34,654		61,335		9,923		28,901		775		42,916		—		31,522		210,026
Doubtful	—		—		—		—		—		1,746		—		6,643		8,389
	$	2,585,421	$	4,688,880	$	226,840	$	2,119,880	$	775	$	4,789,425	$	1,462,655	$	1,154,143	$	17,028,019



	2017
									Commercial and Industrial				Commercial Lending Subsidiaries
	Multi-Family		Non-Owner Occupied Commercial Real Estate		Construction and Land		Owner Occupied Commercial Real Estate		Taxi Medallion Loans		Other Commercial and Industrial		Pinnacle		Bridge		Total
Pass	$	3,124,819	$	4,360,827	$	305,043	$	1,954,464	$	—	$	3,965,241	$	1,524,622	$	954,376	$	16,189,392
Special mention	34,837		33,094		—		22,161		—		37,591		—		55,551		183,234
Substandard	59,297		80,880		5,441		33,145		104,682		27,010		—		27,950		338,405
Doubtful	—		—		—		2,972		1,385		1,918		—		—		6,275
	$	3,218,953	$	4,474,801	$	310,484	$	2,012,742	$	106,067	$	4,031,760	$	1,524,622	$	1,037,877	$	16,717,306

Aging of loans:

The following table presents an aging of loans as of December 31, 2018 and 2017. Amounts include premiums, discounts and deferred fees and costs (in thousands):



	2018										2017
	Current		30 - 59 Days Past Due		60 - 89 Days Past Due		90 Days or More Past Due		Total		Current		30 - 59 Days Past Due		60 - 89 Days Past Due		90 Days or More Past Due		Total
Non-covered loans:
1-4 single family residential	$	4,440,061	$	14,736	$	1,838	$	6,909	$	4,463,544	$	4,121,624	$	15,613	$	4,941	$	3,701	$	4,145,879
Government insured residential	31,348		8,342		8,871		218,168		266,729		23,455		1,611		1,153		1,855		28,074
Home equity loans and lines of credit	1,393		—		—		—		1,393		1,633		21		—		—		1,654
Other consumer loans	15,947		—		—		—		15,947		19,958		15		—		500		20,473
Multi-family	2,585,421		—		—		—		2,585,421		3,218,953		—		—		—		3,218,953
Non-owner occupied commercial real estate	4,682,443		3,621		1,374		1,442		4,688,880		4,464,967		7,549		—		2,285		4,474,801
Construction and land	224,828		916		—		1,096		226,840		309,309		—		—		1,175		310,484
Owner occupied commercial real estate	2,106,104		2,826		1,087		9,863		2,119,880		2,004,397		1,292		499		6,554		2,012,742
Commercial and industrial
Taxi medallion loans	155		—		—		620		775		88,394		6,048		3,333		8,292		106,067
Other commercial and industrial	4,772,823		6,732		926		8,944		4,789,425		4,025,784		4,291		291		1,394		4,031,760
Commercial lending subsidiaries
Pinnacle	1,462,655		—		—		—		1,462,655		1,524,622		—		—		—		1,524,622
Bridge	1,152,312		603		—		1,228		1,154,143		1,037,025		852		—		—		1,037,877
	$	21,475,490	$	37,776	$	14,096	$	248,270	$	21,775,632	$	20,840,121	$	37,292	$	10,217	$	25,756	$	20,913,386
Covered loans:
Non-ACI loans:
1-4 single family residential	$	11,153	$	—	$	—	$	—	$	11,153	$	21,106	$	1,603	$	—	$	1,341	$	24,050
ACI loans:
1-4 single family residential	$	189,557	$	334	$	288	$	44	$	190,223	$	448,125	$	10,388	$	2,719	$	17,836	$	479,068

1-4 single family residential ACI loans that are contractually delinquent by more than 90 days and accounted for in pools on which discount continues to be accreted totaled $44 thousand and $18 million at December 31, 2018 and 2017, respectively. Government insured residential loans on accrual status that are delinquent by more than 90 days totaled $218 million at December 31, 2018.

Loan Concentrations:

At December 31, 2018 and 2017, 1-4 single family residential loans outstanding, excluding government insured residential loans, were collateralized by property located in the following states (dollars in thousands):



	2018
							Percent of Total
	Non-Covered Loans		Covered Loans		Total		Non-Covered Loans		Total Loans
California	$	1,172,470	$	4,751	$	1,177,221	26.3	%	25.2	%
New York	971,121		6,025		977,146		21.8	%	20.9	%
Florida	520,427		124,593		645,020		11.7	%	13.8	%
DC	182,399		812		183,211		4.1	%	3.9	%
Virginia	179,132		5,624		184,756		4.0	%	4.0	%
Others	1,437,995		59,571		1,497,566		32.1	%	32.2	%
	$	4,463,544	$	201,376	$	4,664,920	100.0	%	100.0	%



	2017
							Percent of Total
	Non-Covered Loans		Covered Loans		Total		Non-Covered Loans		Total Loans
California	$	1,094,047	$	23,780	$	1,117,827	26.4	%	24.0	%
New York	871,331		16,847		888,178		21.0	%	19.1	%
Florida	526,540		281,396		807,936		12.7	%	17.4	%
Virginia	181,912		22,290		204,202		4.4	%	4.4	%
DC	169,502		1,933		171,435		4.1	%	3.7	%
Others	1,302,547		156,872		1,459,419		31.4	%	31.4	%
	$	4,145,879	$	503,118	$	4,648,997	100.0	%	100.0	%

No other state represented borrowers with more than 4.0% of total 1-4 single family residential loans outstanding, excluding government insured residential loans, at December 31, 2018 or 2017. At December 31, 2018, 44.8% and 32.5% of loans in the commercial portfolio were to borrowers in Florida and the New York tri-state area, respectively. At December 31, 2017, 43.4% and 36.4% of loans in the non-covered commercial portfolio were to borrowers in Florida and the New York tri-state area, respectively.

Foreclosure of residential real estate

The carrying amount of foreclosed residential real estate properties included in "Other assets" in the accompanying consolidated balance sheets totaled $6 million and $3 million at December 31, 2018 and December 31, 2017, respectively. The recorded investment in non-government insured residential mortgage loans in the process of foreclosure was insignificant at December 31, 2018 and $11 million at December 31, 2017. The recorded investment in government insured residential loans in the process of foreclosure totaled $85 million at December 31, 2018.

Troubled debt restructurings

The following tables summarize loans that were modified in TDRs during the years ended December 31, 2018, 2017 and 2016, as well as loans modified during the years ended December 31, 2018, 2017 and 2016 that experienced payment defaults during the periods (dollars in thousands):



	2018
	Loans Modified in TDRs During the Period			TDRs Experiencing Payment Defaults During the Period
	Number of TDRs	Recorded Investment		Number of TDRs	Recorded Investment
Non-covered loans:
1-4 single family residential⁽¹⁾	36	$	6,462	18	$	2,489
Non-owner occupied commercial real estate	3	5,932		1	2,949
Owner occupied commercial real estate	2	1,076		—	—
Commercial and industrial	6	6,646		2	217
	47	$	20,116	21	$	5,655



	2017
	Loans Modified in TDRs During the Period			TDRs Experiencing Payment Defaults During the Period
	Number of TDRs	Recorded Investment		Number of TDRs	Recorded Investment
Non-covered loans:
1-4 single family residential	7	$	676	5	$	595
Multi-family	2	23,173		—	—
Owner occupied commercial real estate	3	4,685		—	—
Commercial and industrial
Taxi medallion loans	110	48,526		8	2,725
Other commercial and industrial	2	1,378		—	—
	124	$	78,438	13	$	3,320



	2016
	Loans Modified in TDRs During the Period			TDRs Experiencing Payment Defaults During the Period
	Number of TDRs	Recorded Investment		Number of TDRs	Recorded Investment
Non-covered loans:
1-4 single family residential	2	$	326	—	$	—
Owner occupied commercial real estate	3	5,117		1	491
Commercial and industrial
Taxi medallion loans	74	64,854		15	8,657
Other commercial and industrial	8	23,247		2	1,482
Commercial lending subsidiaries	6	6,735		1	2,500
	93	$	100,279	19	$	13,130
Covered loans:
Non-ACI loans:
Home equity loans and lines of credit	17	$	2,016	1	$	370

ACI loans:
Owner occupied commercial real estate	1	$	825	—	$	—


(1)	Includes government insured residential loans modified during the year ended December 31, 2018.

Modifications during the years ended December 31, 2018, 2017 and 2016 included interest rate reductions, restructuring of the amount and timing of required periodic payments, extensions of maturity and covenant waivers. Included in TDRs are residential loans to borrowers who have not reaffirmed their debt discharged in Chapter 7 bankruptcy. The total amount of such loans is not material. Modified ACI loans accounted for in pools are not considered TDRs, are not separated from the pools and are not classified as impaired loans.

- Definition

The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.

+ References + Details

FDIC Indemnification Asset

12 Months Ended

Dec. 31, 2018

FDIC Indemnification Asset [Abstract]

FDIC Indemnification Asset

When the Company recognizes gains or losses related to covered assets in its consolidated financial statements, changes in the estimated amount recoverable from the FDIC under the Loss Sharing Agreements with respect to those gains or losses are also reflected in the consolidated financial statements. Covered loans may be resolved through prepayment, short sale of the underlying collateral, foreclosure, sale of the loans or charge-off. For loans resolved through prepayment, short sale or foreclosure, the difference between consideration received in satisfaction of the loans and the allocated carrying value of the loans is recognized in the consolidated statement of income line item “Income from resolution of covered assets, net.” Losses from the resolution of covered loans increase the amount recoverable from the FDIC under the Loss Sharing Agreements. Gains from the resolution of covered loans reduce the amount recoverable from the FDIC under the Loss Sharing Agreements. Similarly, differences in proceeds received on the sale of covered OREO and covered loans and their allocated carrying amounts result in gains or losses and reduce or increase the amount recoverable from the FDIC under the Loss Sharing Agreements. Increases in valuation allowances or impairment charges related to covered assets also increase the amount estimated to be recoverable from the FDIC. These additions to or reductions in amounts recoverable from the FDIC related to transactions in the covered assets are recorded in the consolidated statement of income line item “Net loss on FDIC indemnification” and reflected as corresponding increases or decreases in the FDIC indemnification asset.

The following tables summarize the components of the gains and losses associated with covered assets, along with the related additions to or reductions in the amounts recoverable from the FDIC under the Loss Sharing Agreements, as reflected in the consolidated statements of income for the years ended December 31, 2018, 2017 and 2016 (in thousands):



	2018
	Transaction Income (Loss)			Net Loss on FDIC Indemnification			Net Impact on Pre-tax Earnings
Provision for losses on covered loans	$	(752	)	$	523		$	(229	)
Income from resolution of covered assets, net	11,551			(9,332		)	2,219
Gain on sale of covered loans	5,732			3,388			9,120
Loss on covered OREO	(1,620		)	1,222			(398		)
	$	14,911		$	(4,199	)	$	10,712



	2017
	Transaction Income (Loss)			Net Loss on FDIC Indemnification			Net Impact on Pre-tax Earnings
Provision for losses on covered loans	$	(1,358	)	$	1,039		$	(319	)
Income from resolution of covered assets, net	27,450			(21,912		)	5,538
Gain on sale of covered loans	17,406			(1,514		)	15,892
Loss on covered OREO	(203		)	167			(36		)
	$	43,295		$	(22,220	)	$	21,075



	2016
	Transaction Income (Loss)			Net Loss on FDIC Indemnification			Net Impact on Pre-tax Earnings
Recovery of losses on covered loans	$	1,681		$	(1,472	)	$	209
Income from resolution of covered assets, net	36,155			(28,946		)	7,209
Loss on sale of covered loans	(14,470		)	11,615			(2,855		)
Loss on covered OREO	(1,301		)	1,044			(257		)
	$	22,065		$	(17,759	)	$	4,306

Changes in the FDIC indemnification asset for the years ended December 31, 2018, 2017 and 2016, were as follows (in thousands):



Balance at December 31, 2015	$	739,843
Amortization	(160,091		)
Reduction for claims filed	(46,083		)
Net loss on FDIC indemnification	(17,759		)
Balance at December 31, 2016	515,910
Amortization	(176,466		)
Reduction for claims filed	(21,589		)
Net loss on FDIC indemnification	(22,220		)
Balance at December 31, 2017	295,635
Amortization	(261,763		)
Reduction for claims	(29,673		)
Net loss on FDIC indemnification	(4,199		)
Balance at December 31, 2018	$	—

The FDIC indemnification asset was amortized to zero as of December 31, 2018 as expectations of losses eligible for indemnification with respect to the remaining covered loans prior to final termination of the Single Family Shared-Loss Agreement were insignificant.

Equipment Under Operating Lease

12 Months Ended

Dec. 31, 2018

Leases [Abstract]

Lessor, Operating Leases [Text Block]

Equipment Under Operating Lease

Equipment under operating lease consists primarily of railcars and other transportation equipment. The components of equipment under operating lease as of December 31, 2018 and 2017, are summarized as follows (in thousands):



	2018			2017
Equipment under operating lease	$	802,302		$	674,434
Less: accumulated depreciation	(99,948		)	(74,932		)
Equipment under operating lease, net	$	702,354		$	599,502

The Company recognized impairment of $4.1 million during the year ended December 31, 2016, related to a group of tank cars impacted by new safety regulations. This impairment charge is included in "Depreciation of equipment under operating lease" in the accompanying consolidated statements of income. No impairment was recognized during the years ended December 31, 2018 and 2017.

At December 31, 2018, scheduled minimum rental payments under operating leases were as follows (in thousands):



Years Ending December 31:
2019	$	65,201
2020	59,512
2021	49,987
2022	43,482
2023	35,342
Thereafter through 2033	100,170
	$	353,694

Federal Home Loan Bank Advances and Other Borrowings

12 Months Ended

Dec. 31, 2018

FHLB Advances, Notes and Other Borrowings [Abstract]

Federal Home Loan Bank Advances, Disclosure [Text Block]

Borrowings

The following table presents information about outstanding FHLB advances as of December 31, 2018 (dollars in thousands):



			Range of Interest Rates
	Amount		Minimum		Maximum		Weighted Average Rate
Maturing in:
2019—One month or less	$	2,325,000	2.24	%	2.53	%	2.41	%
2019—Over one month	1,821,000		1.46	%	2.76	%	2.58	%
2020	375,000		1.67	%	2.91	%	2.49	%
2021	275,000		2.73	%	3.02	%	2.89	%
Carrying value	$	4,796,000

The table above reflects contractual maturities of outstanding advances and does not incorporate the impact that interest rate swaps designated as cash flow hedges have on the duration of borrowings. The terms of the Company's security agreement with the FHLB require a specific assignment of collateral consisting of qualifying first mortgage loans, commercial real estate loans, home equity lines of credit and mortgage-backed securities with unpaid principal amounts discounted at various stipulated percentages at least equal to 100% of outstanding FHLB advances. As of December 31, 2018, the Company had pledged investment securities and real estate loans with an aggregate carrying amount of approximately $10.2 billion as collateral for advances from the FHLB.

At December 31, 2018 and 2017 outstanding senior notes payable and other borrowings consisted of the following (dollars in thousands):



	2018			2017
Principal amount of 4.875% senior notes	$	400,000		$	400,000
Unamortized discount and debt issuance costs	(5,610		)	(6,275		)
	394,390			393,725
Capital lease obligations	8,359			9,105
	$	402,749		$	402,830

The senior notes mature on November 17, 2025 with interest payable semiannually. The notes have an effective interest rate of 5.12%, after consideration of issuance discount and costs. The notes may be redeemed by the Company, in whole or in part, at any time prior to August 17, 2025 at the greater of a) 100% of the principal balance or b) the sum of the present values of the remaining scheduled payments of principal and interest on the securities discounted to the redemption date at i) the rate on a United States Treasury security with a maturity comparable to the remaining maturity of the senior notes that would be used to price new issues of corporate debt securities with a maturity comparable to the remaining maturity of the senior notes plus ii) 40 basis points. The senior notes may be redeemed at any time after August 17, 2025 at 100% of principal plus accrued and unpaid interest.

At December 31, 2018, BankUnited had available borrowing capacity at the FHLB of approximately $3.7 billion, unused borrowing capacity at the FRB of approximately $410 million and unused Federal funds lines of credit with other financial institutions totaling $85 million.

Income Taxes

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Income Taxes

Note 10 Income Taxes

The components of the provision (benefit) for income taxes for the years ended December 31, 2018, 2017 and 2016 were

as follows (in thousands):



	2018		2017			2016
Current:
Federal	$	2,172	$	(251,880	)	$	51,806
State	20,834		(15,733		)	27,708
	23,006		(267,613		)	79,514
Deferred:
Federal	51,303		46,377			35,045
State	16,475		11,424			(4,856		)
	67,778		57,801			30,189
	$	90,784	$	(209,812	)	$	109,703

A reconciliation of expected income tax expense at the statutory federal income tax rate of 21% during the year ended December 31, 2018 and 35% during the years ended December 31, 2017 and 2016, respectively, to the Company's effective income tax rate follows (dollars in thousands):



	2018					2017					2016
	Amount			Percent		Amount			Percent		Amount			Percent
Tax expense calculated at the statutory federal income tax rate	$	87,286		21.00	%	$	141,561		35.00	%	$	117,405		35.00	%
Increases (decreases) resulting from:
Income not subject to tax	(18,923		)	(4.55	)%	(29,511		)	(7.30	)%	(23,215		)	(6.92	)%
State income taxes, net of federal tax benefit	31,182			7.50	%	19,332			4.78	%	15,894			4.74	%
Discrete income tax benefit	—			—	%	(327,945		)	(81.08	)%	—			—	%
Other, net	(8,761		)	(2.11	)%	(13,249		)	(3.27	)%	(381		)	(0.12	)%
	$	90,784		21.84	%	$	(209,812	)	(51.87	)%	$	109,703		32.70	%

The discrete income tax benefit recognized in the year ended December 31, 2017 related to a matter that arose during an ongoing audit of the Company's 2013 federal income tax return. During that audit, the Company asserted that U.S. federal income taxes paid in respect of certain income previously reported by the Company on its 2012, 2013 and 2014 federal income tax returns related to the basis assigned to certain loans acquired in the FSB Acquisition should be refunded to the Company, in light of guidance issued after the relevant returns had been filed. The discrete income tax benefit recognized in 2017 included expected refunds of federal income tax of $295.0 million, as well as $8.7 million in estimated interest on the federal refund and estimated refunds of $24.2 million from certain state and local taxing jurisdictions.

The Company is continuing to evaluate whether it has claims in other state jurisdictions and whether it may have any claims for federal or state income taxes relating to tax years prior to 2012. The Company has not reached any conclusion as to when or to what extent it may have any claims relating to such other state and local taxing jurisdictions or in respect of prior tax years.

The TCJA was signed into law in 2017, reducing the statutory corporate federal income tax rate from 35% to 21%, effective January 1, 2018. A tax benefit of $3.7 million, representing the impact of the rate change on deferred tax assets and liabilities existing at the date of enactment, was recognized in earnings during the quarter ended December 31, 2017 and is included in the "Other, net" line item in the reconciliation above.

The components of deferred tax assets and liabilities at December 31, 2018 and 2017 were as follows (in thousands):



	2018			2017
Deferred tax assets:
Excess of tax basis over carrying value of acquired loans	$	52,341		$	66,395
Allowance for loan and lease losses	25,599			33,309
Net operating loss and tax credit carryforwards	17,209			15,892
Other	33,330			31,859
Gross deferred tax assets	128,479			147,455
Deferred tax liabilities:
Net unrealized gains on investment securities available for sale	1,757			24,657
Lease financing, due to differences in depreciation	167,856			113,161
Other	9,195			13,468
Gross deferred tax liabilities	178,808			151,286
Net deferred tax liability	$	(50,329	)	$	(3,831	)

Based on the evaluation of available evidence, management has concluded that it is more likely than not that the existing deferred tax assets will be realized. The primary factors supporting this conclusion are the amount of taxable income available for carryback and the amount of future taxable income that will result from the scheduled reversal of existing deferred tax liabilities.

At December 31, 2018, remaining carryforwards included federal net operating loss carryforwards in the amount of $7.6 million expiring from 2029 through 2032, Florida net operating loss carryforwards in the amount of $108.8 million, expiring from 2030 through 2037, and state tax credit carryforwards in the amount of $10.9 million, expiring in 2019.

The Company has investments in affordable housing limited partnerships which generate federal Low Income Housing Tax Credits and other tax benefits. The balance of these investments, included in other assets in the accompanying consolidated balance sheet, was $64 million at both December 31, 2018 and 2017. Unfunded commitments for affordable housing investments, included in other liabilities in the accompanying consolidated balance sheet, were $21 million and $26 million at December 31, 2018 and 2017, respectively. The maximum exposure to loss as a result of the Company's involvement with these limited partnerships at December 31, 2018 was approximately $78 million. While the Company believes the likelihood of potential losses from these investments is remote, the maximum exposure was determined by assuming a scenario where the projects completely fail and do not meet certain government compliance requirements resulting in recapture of the related tax credits. These investments did not have a material impact on income tax expense for the years ended December 31, 2018, 2017 and 2016

The Company has a liability for unrecognized tax benefits relating to uncertain federal and state tax positions in several jurisdictions. A reconciliation of the beginning and ending amount of gross unrecognized tax benefits for the years ended December 31, 2018, 2017 and 2016 follows (in thousands):



	2018			2017			2016
Balance, beginning of period	$	59,220		$	72,736		$	43,412
Additions for tax positions related to the current year	2,399			1,882			2,713
Additions for tax positions related to prior periods	77,101			1,661			25,168
Reductions due to change in tax position	(26,037		)	(15,316		)	—
Reductions due to settlements with taxing authorities	—			—			(200		)
Reductions due to lapse of the statute of limitations	(675		)	(2,229		)	—
	112,008			58,734			71,093
Interest and penalties	4,073			486			1,643
Balance, end of period	$	116,081		$	59,220		$	72,736

As of December 31, 2018, 2017 and 2016, the Company had $78.2 million, $43.6 million and $45.0 million of unrecognized federal and state tax benefits, net of federal tax benefits, that if recognized would have impacted the effective tax rate. Unrecognized tax benefits related to state income tax contingencies that may decrease during the 12 months subsequent to December 31, 2018 as a result of settlements with taxing authorities range from zero to $42.8 million.

Interest and penalties related to unrecognized tax benefits are included in the provision for income taxes in the consolidated statements of income. At December 31, 2018 and 2017, accrued interest and penalties included in the consolidated balance sheets, net of federal tax benefits, were $6.5 million and $3.2 million, respectively. The total amounts of interest and penalties, net of federal tax benefits, recognized through income tax expense were $3.2 million, $0.3 million and $1.1 million in 2018, 2017 and 2016, respectively.

The Company and its subsidiaries file a consolidated federal income tax return as well as combined state income tax returns where combined filings are required. Income tax returns for the tax years ended December 31, 2018, 2017, 2016 and 2015 remain subject to examination in the U.S. Federal and various state tax jurisdictions. The tax years ended December 31, 2009, 2010, 2011 and 2012, 2013 and 2014 remain subject to examination by certain states.

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

The components of the provision (benefit) for income taxes for the years ended December 31, 2018, 2017 and 2016 were

as follows (in thousands):



	2018		2017			2016
Current:
Federal	$	2,172	$	(251,880	)	$	51,806
State	20,834		(15,733		)	27,708
	23,006		(267,613		)	79,514
Deferred:
Federal	51,303		46,377			35,045
State	16,475		11,424			(4,856		)
	67,778		57,801			30,189
	$	90,784	$	(209,812	)	$	109,703

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]



	2018					2017					2016
	Amount			Percent		Amount			Percent		Amount			Percent
Tax expense calculated at the statutory federal income tax rate	$	87,286		21.00	%	$	141,561		35.00	%	$	117,405		35.00	%
Increases (decreases) resulting from:
Income not subject to tax	(18,923		)	(4.55	)%	(29,511		)	(7.30	)%	(23,215		)	(6.92	)%
State income taxes, net of federal tax benefit	31,182			7.50	%	19,332			4.78	%	15,894			4.74	%
Discrete income tax benefit	—			—	%	(327,945		)	(81.08	)%	—			—	%
Other, net	(8,761		)	(2.11	)%	(13,249		)	(3.27	)%	(381		)	(0.12	)%
	$	90,784		21.84	%	$	(209,812	)	(51.87	)%	$	109,703		32.70	%

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

The components of deferred tax assets and liabilities at December 31, 2018 and 2017 were as follows (in thousands):



	2018			2017
Deferred tax assets:
Excess of tax basis over carrying value of acquired loans	$	52,341		$	66,395
Allowance for loan and lease losses	25,599			33,309
Net operating loss and tax credit carryforwards	17,209			15,892
Other	33,330			31,859
Gross deferred tax assets	128,479			147,455
Deferred tax liabilities:
Net unrealized gains on investment securities available for sale	1,757			24,657
Lease financing, due to differences in depreciation	167,856			113,161
Other	9,195			13,468
Gross deferred tax liabilities	178,808			151,286
Net deferred tax liability	$	(50,329	)	$	(3,831	)

Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]



	2018			2017			2016
Balance, beginning of period	$	59,220		$	72,736		$	43,412
Additions for tax positions related to the current year	2,399			1,882			2,713
Additions for tax positions related to prior periods	77,101			1,661			25,168
Reductions due to change in tax position	(26,037		)	(15,316		)	—
Reductions due to settlements with taxing authorities	—			—			(200		)
Reductions due to lapse of the statute of limitations	(675		)	(2,229		)	—
	112,008			58,734			71,093
Interest and penalties	4,073			486			1,643
Balance, end of period	$	116,081		$	59,220		$	72,736

Derivatives and Hedging Activities

12 Months Ended

Dec. 31, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivatives and Hedging Activities

The Company uses interest rate swaps to manage interest rate risk related to liabilities that expose the Company to variability in cash flows due to changes in interest rates. The Company enters into LIBOR-based interest rate swaps that are designated as cash flow hedges with the objective of limiting the variability of interest payment cash flows resulting from changes in the benchmark interest rate LIBOR. Changes in the fair value of interest rate swaps designated as cash flow hedging instruments are reported in AOCI and subsequently reclassified into interest expense in the same period in which the related interest on the floating-rate debt obligations affects earnings.

The Company also enters into interest rate derivative contracts with certain of its commercial borrowers to enable those borrowers to manage their exposure to interest rate fluctuations. To mitigate interest rate risk associated with these derivative contracts, the Company enters into offsetting derivative contract positions with primary dealers. These interest rate derivative contracts are not designated as hedging instruments; therefore, changes in the fair value of these derivatives are recognized immediately in earnings. The impact on earnings related to changes in fair value of these derivatives for the years ended December 31, 2018, 2017 and 2016 was not material.

The Company may be exposed to credit risk in the event of non-performance by the counterparties to its interest rate derivative agreements. The Company assesses the credit risk of its financial institution counterparties by monitoring publicly available credit rating and financial information. The Company manages dealer credit risk by entering into interest rate derivatives only with primary and highly rated counterparties, the use of ISDA master agreements, central clearing mechanisms and counterparty limits. The agreements contain bilateral collateral arrangements with the amount of collateral to be posted generally governed by the settlement value of outstanding swaps. The Company manages the risk of default by its borrower counterparties through its normal loan underwriting and credit monitoring policies and procedures. The Company does not currently anticipate any losses from failure of interest rate derivative counterparties to honor their obligations.

The CME legally characterizes variation margin payments for centrally cleared derivatives as settlements of the derivatives' exposures rather than collateral. As a result, the variation margin payment and the related derivative instruments are considered a single unit of account for accounting and financial reporting purposes. The Company's clearing agent for interest rate derivative contracts centrally cleared through the CME settles the variation margin daily with the CME; therefore, those interest rate derivative contracts the Company clears through the CME are reported at a fair value of approximately zero at December 31, 2018 and 2017.

The following tables set forth certain information concerning the Company’s interest rate contract derivative financial instruments and related hedged items at December 31, 2018 and 2017 (dollars in thousands):



	2018
		Weighted Average Pay Rate	Weighted Average Receive Rate	Weighted Average Remaining Life in Years
					Notional Amount		Balance Sheet Location	Fair Value
	Hedged Item				Notional Amount		Balance Sheet Location	Asset		Liability
Derivatives designated as cash flow hedges:
Pay-fixed interest rate swaps	Variability of interest cash flows on variable rate borrowings	2.38%	3-Month Libor	4.0	$	2,846,000	Other assets / Other liabilities	$	3,405	$	—
Derivatives not designated as hedges:
Pay-fixed interest rate swaps		4.10%	Indexed to 1-month Libor	6.0	1,048,196		Other assets / Other liabilities	14,883		(6,991		)
Pay-variable interest rate swaps		Indexed to 1-month Libor	4.10%	6.0	1,048,196		Other assets / Other liabilities	11,318		(16,874		)
Interest rate caps purchased, indexed to 1-month Libor			3.43%	1.2	98,407		Other assets	9		—
Interest rate caps sold, indexed to 1-month Libor		3.43%		1.2	98,407		Other liabilities	—		(9		)
					$	5,139,206		$	29,615	$	(23,874	)



	2017
		Weighted Average Pay Rate	Weighted Average Receive Rate	Weighted Average Remaining Life in Years
					Notional Amount		Balance Sheet Location	Fair Value
	Hedged Item				Notional Amount		Balance Sheet Location	Asset		Liability
Derivatives designated as cash flow hedges:
Pay-fixed interest rate swaps	Variability of interest cash flows on variable rate borrowings	1.77%	3-Month Libor	4.3	$	2,046,000	Other assets / Other liabilities	$	2,350	$	—
Derivatives not designated as hedges:
Pay-fixed interest rate swaps		3.87%	Indexed to 1-month Libor	6.4	1,028,041		Other assets / Other liabilities	10,856		(13,173		)
Pay-variable interest rate swaps		Indexed to 1-month Libor	3.87%	6.4	1,028,041		Other assets / Other liabilities	14,410		(12,189		)
Interest rate caps purchased, indexed to 1-month Libor			2.81%	1.3	145,354		Other assets	11		—
Interest rate caps sold, indexed to 1-month Libor		2.81%		1.3	145,354		Other liabilities	—		(11		)
					$	4,392,790		$	27,627	$	(25,373	)

The following table provides information about the amount of gain (loss) related to derivatives designated as cash flow hedges reclassified from AOCI into interest expense for the years ended December 31, 2018, 2017 and 2016 (dollars in thousands):



	2018		2017			2016			Location of Gain (Loss) Reclassified from AOCI into Income
Interest rate contracts	$	1,999	$	(9,621	)	$	(16,161	)	Interest expense on borrowings

During the years ended December 31, 2018, 2017 and 2016, no derivative positions designated as cash flow hedges were discontinued and none of the gains and losses reported in AOCI were reclassified into earnings as a result of the discontinuance of cash flow hedges or because of the early extinguishment of debt. As of December 31, 2018, the amount of net gain expected to be reclassified from AOCI into earnings during the next twelve months was $7.9 million.

Some of the Company’s ISDA master agreements with financial institution counterparties contain provisions that permit either counterparty to terminate the agreements and require settlement in the event that regulatory capital ratios fall below certain designated thresholds, upon the initiation of other defined regulatory actions or upon suspension or withdrawal of the Bank’s credit rating. Currently, there are no circumstances that would trigger these provisions of the agreements.

The Company does not offset assets and liabilities under master netting agreements for financial reporting purposes. Information on interest rate swaps subject to these agreements is as follows at December 31, 2018 and 2017 (in thousands):



	2018
				Gross Amounts Offset in Balance Sheet		Net Amounts Presented in Balance Sheet			Gross Amounts Not Offset in Balance Sheet
	Gross Amounts Recognized			Gross Amounts Offset in Balance Sheet		Net Amounts Presented in Balance Sheet			Derivative Instruments			Collateral Pledged			Net Amount
Derivative assets	$	18,297		$	—	$	18,297		$	(5,264	)	$	(13,129	)	$	(96	)
Derivative liabilities	(6,991		)	—		(6,991		)	5,264			436			(1,291		)
	$	11,306		$	—	$	11,306		$	—		$	(12,693	)	$	(1,387	)



	2017
				Gross Amounts Offset in Balance Sheet		Net Amounts Presented in Balance Sheet			Gross Amounts Not Offset in Balance Sheet
	Gross Amounts Recognized			Gross Amounts Offset in Balance Sheet		Net Amounts Presented in Balance Sheet			Derivative Instruments			Collateral Pledged			Net Amount
Derivative assets	$	13,217		$	—	$	13,217		$	(7,996	)	$	(5,221	)	$	—
Derivative liabilities	(13,173		)	—		(13,173		)	7,996			4,962			(215		)
	$	44		$	—	$	44		$	—		$	(259	)	$	(215	)

The difference between the amounts reported for interest rate swaps subject to master netting agreements and the total fair value of interest rate contract derivative financial instruments reported in the consolidated balance sheets is related to interest rate contracts entered into with borrowers not subject to master netting agreements.

At December 31, 2018, the Company had pledged net financial collateral of $0.4 million as collateral for initial margin requirements on centrally cleared derivatives and interest rate swaps in a liability position that are not centrally cleared. Financial collateral of $15 million was pledged by counterparties to the Company for interest rate swaps in an asset position. The amount of collateral required to be posted varies based on the settlement value of outstanding swaps and in some cases may include initial margin requirements.

Stockholders' Equity

12 Months Ended

Dec. 31, 2018

Equity [Abstract]

Stockholders' Equity

Stockholders’ Equity

Accumulated Other Comprehensive Income

Changes in other comprehensive income are summarized as follows for the years ended December 31, 2018, 2017 and 2016 (in thousands):



	2018
	Before Tax			Tax Effect			Net of Tax
Unrealized gains on investment securities available for sale:
Net unrealized holding loss arising during the period	$	(77,607	)	$	20,566		$	(57,041	)
Amounts reclassified to gain on investment securities available for sale, net	(6,103		)	1,617			(4,486		)
Net change in unrealized gains on investment securities available for sale	(83,710		)	22,183			(61,527		)
Unrealized losses on derivative instruments:
Net unrealized holding gain arising during the period	5,416			(1,435		)	3,981
Amounts reclassified to interest expense on borrowings	(1,999		)	530			(1,469		)
Net change in unrealized losses on derivative instruments	3,417			(905		)	2,512
Other comprehensive loss	$	(80,293	)	$	21,278		$	(59,015	)



	2017
	Before Tax			Tax Effect			Net of Tax
Unrealized gains on investment securities available for sale:
Net unrealized holding gain arising during the period	$	49,131		$	(19,407	)	$	29,724
Amounts reclassified to gain on investment securities available for sale, net	(33,466		)	13,219			(20,247		)
Net change in unrealized gains on investment securities available for sale	15,665			(6,188		)	9,477
Unrealized losses on derivative instruments:
Net unrealized holding loss arising during the period	(2,577		)	1,018			(1,559		)
Amounts reclassified to interest expense on borrowings	9,621			(3,800		)	5,821
Net change in unrealized losses on derivative instruments	7,044			(2,782		)	4,262
Other comprehensive income	$	22,709		$	(8,970	)	$	13,739



	2016
	Before Tax			Tax Effect			Net of Tax
Unrealized gains on investment securities available for sale:
Net unrealized holding gain arising during the period	$	23,588		$	(9,317	)	$	14,271
Amounts reclassified to gain on investment securities available for sale, net	(14,461		)	5,712			(8,749		)
Net change in unrealized gains on investment securities available for sale	9,127			(3,605		)	5,522
Unrealized losses on derivative instruments:
Net unrealized holding gain arising during the period	6,225			(2,459		)	3,766
Amounts reclassified to interest expense on borrowings	16,161			(6,384		)	9,777
Net change in unrealized losses on derivative instruments	22,386			(8,843		)	13,543
Other comprehensive income	$	31,513		$	(12,448	)	$	19,065

The categories of AOCI and changes therein are presented below for the years ended December 31, 2018, 2017 and 2016 (in thousands):



	Unrealized Gain (Loss) on Investment Securities Available for Sale			Unrealized Gain (Loss) on Derivative Instruments			Total
Balance at December 31, 2015	$	41,535		$	(19,353	)	$	22,182
Other comprehensive income	5,522			13,543			19,065
Balance at December 31, 2016	$	47,057		$	(5,810	)	$	41,247
Other comprehensive income	9,477			4,262			13,739
Balance at December 31, 2017	$	56,534		$	(1,548	)	$	54,986
Cumulative effect of adoption of new accounting standards	9,187			(285		)	8,902
Other comprehensive loss	(61,527		)	2,512			(59,015		)
Balance at December 31, 2018	$	4,194		$	679		$	4,873

Other

In January 2019, the Company's Board of Directors authorized the repurchase of up to $150 million of its outstanding common stock. Any repurchases will be made in accordance with applicable securities laws from time to time in open market or private transactions. The program may be commenced, suspended or discontinued without prior notice.

In conjunction with a previous acquisition, the Company had issued 1,834,160 warrants to purchase its common stock. The warrants expired unexercised in November 2018.

Equity Based Compensation

12 Months Ended

Dec. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Share-based Compensation, Stock Options, Activity [Table Text Block]

Note 13 Equity Based and Other Compensation Plans

Description of Equity Based Compensation Plans

In connection with the IPO of the Company's common stock in 2011, the Company adopted the 2010 Plan. In 2014, the Board of Directors and the Company's stockholders approved the 2014 Plan. The 2010 Plan and 2014 Plans are administered by the Board of Directors or a committee thereof and provide for the grant of non-qualified stock options, SARs, restricted shares, deferred shares, performance shares, unrestricted shares and other share-based awards to selected employees, directors or independent contractors of the Company and its affiliates. The number of shares of common stock authorized for award under the 2010 Plan is 7,500,000, of which 118,847 shares remain available for issuance as of December 31, 2018. The number of shares of common stock available for issuance under the 2014 Plan is 4,000,000, of which 2,061,087 shares remain available for issuance as of December 31, 2018. Shares of common stock delivered under the plans may consist of authorized but unissued shares or previously issued shares reacquired by the Company. The term of a share option or SAR issued under the plans may not exceed ten years from the date of grant and the exercise price may not be less than the fair market value of the Company's common stock at the date of grant. Unvested awards generally become fully vested in the event of a change in control, as defined.

Compensation Expense Related to Equity Based Awards

The following table summarizes compensation cost related to equity based awards for the years ended December 31, 2018, 2017 and 2016 (in thousands):



	2018			2017			2016
Compensation cost of equity based awards:
Unvested and restricted share awards	$	19,415		$	18,087		$	16,885
Executive share-based awards	3,027			3,416			1,482
Incentive awards	798			1,289			—
Total compensation cost of equity based awards	23,240			22,792			18,367
Related tax benefits	(5,783		)	(8,576		)	(6,899		)
Compensation cost of equity based awards, net of tax	$	17,457		$	14,216		$	11,468

Share Awards

Unvested share awards

A summary of activity related to unvested share awards follows for the years ended December 31, 2018, 2017 and 2016 follows:



	Number of Share Awards		Weighted Average Grant Date Fair Value
Unvested share awards outstanding, December 31, 2015	1,040,385		$	31.86
Granted	651,760		31.00
Vested	(428,167	)	31.79
Canceled or forfeited	(143,278	)	31.31
Unvested share awards outstanding, December 31, 2016	1,120,700		31.46
Granted	621,806		40.24
Vested	(553,007	)	31.67
Canceled or forfeited	(81,022	)	34.51
Unvested share awards outstanding, December 31, 2017	1,108,477		36.06
Granted	683,137		40.06
Vested	(532,662	)	34.64
Canceled or forfeited	(72,714	)	38.43
Unvested share awards outstanding, December 31, 2018	1,186,238		$	38.86

Unvested share awards are generally valued at the closing price of the Company's common stock on the date of grant. All of the shares vest in equal annual installments over a period of three years from the date of grant. The following table summarizes the range of the closing price of the Company's stock on the date of grant for shares granted and the aggregate grant date fair value of shares vesting for the years ended December 31, 2018, 2017 and 2016 (in thousands, except per share data):



	2018		2017		2016
Range of the closing price on date of grant	$33.44 - $42.8		$33.21 - $40.84		$29.78 - $33.76
Aggregate grant date fair value of shares vesting	$	18,451	$	17,514	$	13,613

The total unrecognized compensation cost of $26.5 million for all unvested share awards outstanding at December 31, 2018 will be recognized over a weighted average remaining period of 1.70 years.

Executive share-based awards

Certain of the Company's executives are eligible to receive annual awards of RSUs and PSUs (collectively, the "share units"). Annual awards of RSUs represent a fixed number of shares and vest on December 31st in equal tranches over three years. PSUs are initially granted based on a target value. The number of PSUs that ultimately vest at the end of a three-year performance measurement period will be based on the achievement of performance criteria pre-established by the Compensation Committee of the Board of Directors. The performance criteria established for the PSUs granted in 2018, 2017 and 2016 include both performance and market conditions. Upon vesting, the share units will be converted to common stock on a one-for-one basis, or may be settled in cash at the Company's option. The share units will accumulate dividends declared on the Company's common stock from the date of grant to be paid subsequent to vesting.

The Company has cash settled all tranches of RSUs that have vested through December 31, 2017. RSUs vested on December 31, 2018 have not yet settled. As a result of the previous cash settlements, all RSUs and PSUs have been determined to be liability instruments and are remeasured at fair value each reporting period until the awards are settled. The RSUs are valued based on the closing price of the Company's common stock at the reporting date. The PSUs are valued based on the closing price of the Company's common stock at the reporting date net of a discount related to any applicable market conditions, considering the probability of meeting the defined performance conditions. Compensation cost related to PSUs is recognized during the performance period based on the probable outcome of the respective performance conditions.

A summary of activity related to executive share-based awards for the years ended December 31, 2018, 2017 and 2016 follows:



	RSU		PSU
Unvested executive share-based awards outstanding, December 31, 2015	—		—
Granted	97,852		57,873
Vested	(19,291	)	—
Unvested executive share-based awards outstanding, December 31, 2016	78,561		57,873
Granted	47,848		47,848
Vested	(35,238	)	—
Unvested executive share-based awards outstanding, December 31, 2017	91,171		105,721
Granted	52,026		52,026
Vested	(52,585	)	(57,873	)
Unvested executive share-based awards outstanding, December 31, 2018	90,612		99,874

The total liability for the share units was $5.5 million at December 31, 2018. The total unrecognized compensation cost of $3.9 million for these share units at December 31, 2018 will be recognized over a weighted average remaining period of 1.78 years.

Incentive awards

The Company's annual incentive compensation arrangements for employees other than those eligible for the executive share-based awards discussed above provide for settlement through a combination of cash payments and unvested share awards following the end of the annual performance period. The dollar value of share awards to be granted is based on the achievement of performance criteria established in the incentive arrangements. The number of shares of common stock to be awarded is variable based on the closing price of the Company's stock on the date of grant; therefore, these awards are initially classified as liability instruments, with compensation cost recognized from the beginning of the performance period. The awards vest in equal installments over a period of three years from the date of grant. The total liability for incentive share awards was $0.8 million at December 31, 2018. The total unrecognized compensation cost of $2.3 million for incentive share awards at December 31, 2018 will be recognized over a weighted average remaining period of 3.00 years. The accrued liability and unrecognized compensation cost are based on management's current estimate of the likely outcome of the performance criteria established in the incentive arrangements and may differ from actual results.

The 683,137 unvested share awards granted during the year ended December 31, 2018, as discussed above, included 77,050 unvested share awards granted under the Company's annual incentive compensation arrangements based on the achievement of established performance criteria for the year ended December 31, 2017.

Option Awards

A summary of activity related to stock option awards for the years ended December 31, 2018, 2017 and 2016 follows:



	Number of Option Awards		Weighted Average Exercise Price
Option awards outstanding, December 31, 2015	3,651,152		$	26.62
Exercised	(47,979	)	16.50
Canceled or forfeited	(1,097	)	63.74
Option awards outstanding, December 31, 2016	3,602,076		26.74
Exercised	(2,331,388	)	26.63
Option awards outstanding, December 31, 2017	1,270,688		26.93
Exercised	(291,689	)	26.49
Canceled or forfeited	(14,159	)	11.14
Option awards outstanding and exercisable, December 31, 2018	964,840		$	27.30

The intrinsic value of options exercised during the years ended December 31, 2018, 2017 and 2016 was $4.6 million, $25.8 million and $0.9 million, respectively. The related tax benefit of options exercised was $1.1 million, $4.0 million and $0.3 million, respectively, during the years ended December 31, 2018, 2017 and 2016.

Equity Based Compensation

ption Awards

A summary of activity related to stock option awards for the years ended December 31, 2018, 2017 and 2016 follows:



	Number of Option Awards		Weighted Average Exercise Price
Option awards outstanding, December 31, 2015	3,651,152		$	26.62
Exercised	(47,979	)	16.50
Canceled or forfeited	(1,097	)	63.74
Option awards outstanding, December 31, 2016	3,602,076		26.74
Exercised	(2,331,388	)	26.63
Option awards outstanding, December 31, 2017	1,270,688		26.93
Exercised	(291,689	)	26.49
Canceled or forfeited	(14,159	)	11.14
Option awards outstanding and exercisable, December 31, 2018	964,840		$	27.30

There were no option awards granted during the years ended December 31, 2018, 2017 and 2016. Additional information about options outstanding and exercisable at December 31, 2018 is presented in the following table:



	Outstanding and Exercisable Options
Range of Exercise Prices	Number of Options	Weighted Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value (in thousands)
$11.14	3,910	0.73	$	74
$15.94 - $19.97	29,145	1.59	357
$22.18 - $22.31	40,917	2.42	314
$27	888,908	2.08	2,613
$63.74	1,960	0.18	—
	964,840	2.07	3,358

Deferred Compensation Plan

The Company has a non-qualified deferred compensation plan for a select group of key management or highly compensated employees whereby a participant, upon election, may defer a portion of eligible compensation. The deferred compensation plan provides for discretionary Company contributions. Generally, the Company has elected not to make contributions. The Company credits each participant's account with income based on either an annual interest rate determined by the Company's Compensation Committee or returns of selected investment portfolios, as elected by the participant. A participant's elective deferrals and interest thereon are at all times 100% vested. Company contributions and interest thereon will become 100% vested upon the earlier of a change in control, as defined, or the participant's death, disability, attainment of normal retirement age or the completion of two years of service. Participant deferrals and any associated earnings will be paid upon separation from service or based on a specified distribution schedule, as elected by the participant. Deferred compensation expense was $1.3 million, $1.5 million and $1.5 million for the years ended December 31, 2018, 2017 and 2016, respectively. Deferred compensation liabilities of $24 million and $21 million were included in other liabilities in the accompanying consolidated balance sheets at December 31, 2018 and 2017, respectively.

BankUnited 401(k) Plan

Under the terms of the 401(k) Plan sponsored by the Company, eligible employees may contribute a portion of compensation not exceeding the limits set by law. Employees are eligible to participate in the plan after one month of service. The 401(k) Plan allows a matching employer contribution equal to 100% of elective deferrals that do not exceed 1% of compensation, plus 70% of elective deferrals that exceed 1% but are less than 6% of compensation. Matching contributions are fully vested after two years of service. For the years ended December 31, 2018, 2017 and 2016, BankUnited made matching contributions to the 401(k) Plan of approximately $6.3 million, $5.5 million and $5.2 million, respectively.

Regulatory Requirements and Restrictions

12 Months Ended

Dec. 31, 2017

Banking and Thrift [Abstract]

Regulatory Capital Requirements under Banking Regulations [Text Block]

Regulatory Requirements and Restrictions

The Company and the Bank are subject to various regulatory capital requirements administered by Federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory—and possibly additional discretionary—actions by regulators that, if undertaken, could have a direct material effect on the Company's financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company and the Bank must meet specific capital guidelines that involve quantitative measures of assets, liabilities and certain off-balance-sheet items calculated pursuant to regulation. The capital amounts and classification also are subject to qualitative judgments by the regulators about components, risk weightings and other factors. Banking regulations identify five capital categories for insured depository institutions: well-capitalized, adequately capitalized, undercapitalized, significantly undercapitalized and critically undercapitalized. As of December 31, 2018 and 2017, all capital ratios of the Company and the Bank exceeded the "well capitalized" levels under the regulatory framework for prompt corrective action. Quantitative measures established by regulation to ensure capital adequacy require the Company and the Bank to maintain minimum amounts and ratios of total, common equity tier 1 and tier 1 capital (as defined in the regulations) to risk-weighted assets (as defined), and of tier 1 capital to average tangible assets (leverage ratio).

The following tables provide information regarding regulatory capital for the Company and the Bank as of December 31, 2018 and 2017 (dollars in thousands):



	2018
	Actual				Required to be Considered Well Capitalized				Required to be Considered Adequately Capitalized				Required to be Considered Adequately Capitalized Under Capital Conservation Buffer
	Amount		Ratio		Amount		Ratio		Amount		Ratio		Amount		Ratio
BankUnited, Inc.:
Tier 1 leverage	$	2,839,302	8.99	%	N/A ⁽¹⁾		N/A⁽¹⁾		$	1,263,725	4.00	%	N/A		N/A
CET1 risk-based capital	$	2,839,302	12.57	%	$	1,467,693	6.50	%	$	1,016,095	4.50	%	$	1,580,593	7.00	%
Tier 1 risk-based capital	$	2,839,302	12.57	%	$	1,806,392	8.00	%	$	1,354,794	6.00	%	$	1,919,291	8.50	%
Total risk based capital	$	2,952,464	13.08	%	$	2,257,990	10.00	%	$	1,806,392	8.00	%	$	2,370,889	10.50	%
BankUnited:
Tier 1 leverage	$	3,026,106	9.60	%	$	1,575,712	5.00	%	$	1,260,569	4.00	%	N/A		N/A
CET1 risk-based capital	$	3,026,106	13.45	%	$	1,462,054	6.50	%	$	1,012,191	4.50	%	$	1,574,519	7.00	%
Tier 1 risk-based capital	$	3,026,106	13.45	%	$	1,799,451	8.00	%	$	1,349,588	6.00	%	$	1,911,917	8.50	%
Total risk based capital	$	3,139,268	13.96	%	$	2,249,314	10.00	%	$	1,799,451	8.00	%	$	2,361,779	10.50	%



	2017
	Actual				Required to be Considered Well Capitalized				Required to be Considered Adequately Capitalized
	Amount		Ratio		Amount		Ratio		Amount		Ratio
BankUnited, Inc.:
Tier 1 leverage	$	2,892,069	9.72	%	N/A ⁽¹⁾		N/A ⁽¹⁾		$	1,189,944	4.00	%
CET1 risk-based capital	$	2,892,069	13.11	%	$	1,434,193	6.50	%	$	992,903	4.50	%
Tier 1 risk-based capital	$	2,892,069	13.11	%	$	1,765,161	8.00	%	$	1,323,871	6.00	%
Total risk based capital	$	3,041,004	13.78	%	$	2,206,451	10.00	%	$	1,765,161	8.00	%
BankUnited:
Tier 1 leverage	$	3,107,920	10.47	%	$	1,483,796	5.00	%	$	1,187,037	4.00	%
CET1 risk-based capital	$	3,107,920	14.13	%	$	1,429,999	6.50	%	$	989,999	4.50	%
Tier 1 risk-based capital	$	3,107,920	14.13	%	$	1,759,999	8.00	%	$	1,319,999	6.00	%
Total risk based capital	$	3,255,221	14.80	%	$	2,199,999	10.00	%	$	1,759,999	8.00	%

(1) There is no Tier 1 leverage ratio component in the definition of a well-capitalized bank holding company.

For purposes of risk based capital computations, the FDIC Indemnification asset and the covered assets are risk-weighted at 20% due to the conditional guarantee represented by the Loss Sharing Agreements.

BankUnited is subject to various regulatory restrictions relating to the payment of dividends, including requirements to maintain capital at or above certain minimums, and to remain "well-capitalized" under the prompt corrective action regulations. The Company does not expect that any of these laws, regulations or policies will materially affect the ability of BankUnited to pay dividends in the future.

Beginning January 1, 2019, the Bank and the Company will have to maintain a capital conservation buffer composed of CET1 capital equal to 2.50% of risk-weighted assets above the amounts required to be adequately capitalized in order to avoid limitations on capital distributions, including dividend payments and certain discretionary bonus payments to executive officers.

BankUnited is required by the Board of Governors of the Federal Reserve System to maintain reserve balances in the form of vault cash or deposits with the FRB. At December 31, 2018, the reserve requirement for BankUnited was $148 million.

- Definition

The entire disclosure for banks, savings institutions, and credit unions, for regulatory capital requirements imposed by the Federal Reserve System (FRB), the Federal Deposit Insurance Corporation (FDIC), the Office of Thrift Supervision (OTS) or for any state imposed capital requirements, as applicable. The disclosure may include (1) a description of regulatory capital requirements (a) for capital adequacy purposes and (b) established by the prompt corrective action provisions of Section 38 of the Federal Depository Insurance Act; (2) the actual or possible material effects of noncompliance with such requirements; (3) whether the entity is in compliance with the regulatory capital requirements including (a) required and actual ratios and amounts of Tier 1 leverage, Tier 1 risk-based, and total risk-based capital, tangible capital (for savings institutions), and Tier 3 capital for market risk (for certain banks and bank holding companies), (b) factors that may significantly affect capital adequacy; (4) the prompt corrective action category in which the entity was classified as of its most recent notification; (5) whether management believes any conditions or events since notification have changed the entity's category. Also may include additional information that might be disclosed in situations where substantial doubt about the entity's ability to continue as a going concern for a reasonable period of time.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1G
-URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958577-112826

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1C
-URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958572-112826

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1E
-URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958574-112826

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1H
-URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958569-112826

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958570-112826

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1F
-URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958575-112826

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1D
-URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958573-112826

+ Details

Fair Value Measurements

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurements

Assets and liabilities measured at fair value on a recurring basis

Following is a description of the methodologies used to estimate the fair values of assets and liabilities measured at fair value on a recurring basis and the level within the fair value hierarchy in which those measurements are typically classified.

Investment securities available for sale and marketable equity securities—Fair value measurements are based on quoted prices in active markets when available; these measurements are classified within level 1 of the fair value hierarchy. These securities typically include U.S. Treasury securities and certain preferred stocks. If quoted prices in active markets are not available, fair values are estimated using quoted prices of securities with similar characteristics, quoted prices of identical securities in less active markets, discounted cash flow techniques, or matrix pricing models. These securities are generally classified within level 2 of the fair value hierarchy and include U.S. Government agency securities, U.S. Government agency and sponsored enterprise MBS, preferred stock investments for which level 1 valuations are not available, corporate debt securities, non-mortgage asset-backed securities, single family rental real estate-backed securities, certain private label residential MBS and CMOs, private label commercial MBS, collateralized loan obligations and state and municipal obligations. Pricing of these securities is generally primarily spread driven. Observable inputs that may impact the valuation of these securities include benchmark yield curves, credit spreads, reported trades, dealer quotes, bids, issuer spreads, current rating, historical constant prepayment rates, historical voluntary prepayment rates, structural and waterfall features of individual securities, published collateral data, and for certain securities, historical constant default rates and default severities. Investment securities available for sale generally classified within level 3 of the fair value hierarchy include certain private label MBS and trust preferred securities. The Company typically values these securities using third-party proprietary pricing models, primarily discounted cash flow valuation techniques, which incorporate both observable and unobservable inputs. Unobservable inputs that may impact the valuation of these securities include risk adjusted discount rates, projected prepayment rates, projected default rates and projected loss severity.

The Company uses third-party pricing services in determining fair value measurements for investment securities. To obtain an understanding of the methodologies and assumptions used, management reviews written documentation provided by the pricing services, conducts interviews with valuation desk personnel and reviews model results and detailed assumptions used to value selected securities as considered necessary. Management has established a robust price challenge process that includes a review by the treasury front office of all prices provided on a monthly basis. Any price evidencing unexpected month over month fluctuations or deviations from expectations is challenged. If considered necessary to resolve any discrepancies, a price will be obtained from an additional independent valuation source. The Company does not typically adjust the prices provided, other than through this established challenge process. The results of price challenges are subject to review by executive management. The Company has also established a quarterly process whereby prices provided by its primary pricing service for a sample of securities are validated. Any price discrepancies are resolved based on careful consideration of the assumptions and inputs employed by each of the pricing sources.

Servicing rights—Commercial servicing rights are valued using a discounted cash flow methodology incorporating contractually specified servicing fees and market based assumptions about prepayments, discount rates, default rates and costs of servicing. Prepayment and default assumptions are based on historical industry data for loans with similar characteristics. Assumptions about costs of servicing are based on market convention. Discount rates are based on rates of return implied by observed trades of underlying loans in the secondary market.

All of the Company's residential mortgage servicing rights were sold in 2018.

Derivative financial instruments—Fair values of interest rate swaps are determined using widely accepted discounted cash flow modeling techniques. These discounted cash flow models use projections of future cash payments and receipts that are discounted at mid-market rates. Observable inputs that may impact the valuation of these instruments include LIBOR swap rates and LIBOR forward yield curves. These fair value measurements are generally classified within level 2 of the fair value hierarchy.

The following tables present assets and liabilities measured at fair value on a recurring basis at the dates indicated (in thousands):



	2018
	Level 1		Level 2		Level 3		Total
Investment securities available for sale:
U.S. Treasury securities	$	39,873	$	—	$	—	$	39,873
U.S. Government agency and sponsored enterprise residential MBS	—		1,897,474		—		1,897,474
U.S. Government agency and sponsored enterprise commercial MBS	—		374,787		—		374,787
Private label residential MBS and CMOs	—		1,499,514		34,684		1,534,198
Private label commercial MBS	—		1,485,716		—		1,485,716
Single family rental real estate-backed securities	—		402,458		—		402,458
Collateralized loan obligations	—		1,235,198		—		1,235,198
Non-mortgage asset-backed securities	—		204,067		—		204,067
State and municipal obligations	—		398,429		—		398,429
SBA securities	—		519,313		—		519,313
Other debt securities	—		—		4,846		4,846
Marketable equity securities	60,519		—		—		60,519
Servicing rights	—		—		9,525		9,525
Derivative assets	—		29,615		—		29,615
Total assets at fair value	$	100,392	$	8,046,571	$	49,055	$	8,196,018
Derivative liabilities	$	—	$	23,874	$	—	$	23,874
Total liabilities at fair value	$	—	$	23,874	$	—	$	23,874



	2017
	Level 1		Level 2		Level 3		Total
Investment securities available for sale:
U.S. Treasury securities	$	24,953	$	—	$	—	$	24,953
U.S. Government agency and sponsored enterprise residential MBS	—		2,058,027		—		2,058,027
U.S. Government agency and sponsored enterprise commercial MBS	—		234,508		—		234,508
Private label residential MBS and CMOs	—		576,033		52,214		628,247
Private label commercial MBS	—		1,046,415		—		1,046,415
Single family rental real estate-backed securities	—		562,706		—		562,706
Collateralized loan obligations	—		723,681		—		723,681
Non-mortgage asset-backed securities	—		121,747		—		121,747
Marketable equity securities	63,543		—		—		63,543
State and municipal obligations	—		657,203		—		657,203
SBA securities	—		550,682		—		550,682
Other debt securities	—		3,791		5,329		9,120
Servicing rights	—		—		30,737		30,737
Derivative assets	—		27,627		—		27,627
Total assets at fair value	$	88,496	$	6,562,420	$	88,280	$	6,739,196
Derivative liabilities	$	—	$	25,373	$	—	$	25,373
Total liabilities at fair value	$	—	$	25,373	$	—	$	25,373

The following table reconciles changes in the fair value of assets and liabilities measured at fair value on a recurring basis and classified in level 3 of the fair value hierarchy during the years ended December 31, 2018, 2017 and 2016 (in thousands):



	2018
	Private Label Residential MBS			Other Debt Securities			Servicing Rights
Balance at beginning of period	$	52,214		$	5,329		$	30,737
Gains (losses) for the period included in:
Net income	1,319			—			761
Other comprehensive income	(5,193		)	(289		)	—
Discount accretion	2,916			809			—
Purchases or additions	—			—			12,600
Sales	(5,120		)	—			(34,573		)
Settlements	(11,452		)	(1,003		)	—
Balance at end of period	$	34,684		$	4,846		$	9,525
Change in unrealized gains or losses included in OCI for assets held at the end of the reporting period	$	(3,724	)	$	(289	)



	2017
	Private Label Residential MBS			Other Debt Securities			Servicing Rights
Balance at beginning of period	$	120,610		$	4,572		$	27,159
Gains (losses) for the period included in:
Net income	25,547			—			(5,821		)
Other comprehensive income	(27,569		)	766			—
Discount accretion	6,181			280			—
Purchases or additions	—			—			9,399
Sales	(45,524		)	—			—
Settlements	(27,031		)	(289		)	—
Balance at end of period	$	52,214		$	5,329		$	30,737
Change in unrealized gains or losses included in OCI for assets held at the end of the reporting period	$	(3,345	)	$	766



	2016
	Private Label Residential MBS			Other Debt Securities			Servicing Rights
Balance at beginning of period	$	140,883		$	4,532		$	20,017
Gains (losses) for the period included in:
Net income	—			—			(6,023		)
Other comprehensive income	(2,229		)	(9		)	—
Discount accretion	5,947			116			—
Purchases or additions	—			—			13,165
Settlements	(23,991		)	(67		)	—
Balance at end of period	$	120,610		$	4,572		$	27,159
Change in unrealized gains or losses included in OCI for assets held at the end of the reporting period	$	(2,229	)	$	(9	)

Gains on private label residential MBS recognized in net income during the years ended December 31, 2018 and 2017 are included in the consolidated statement of income line item "Gain on investment securities, net." Changes in the fair value of servicing rights are included in the consolidated statement of income line item “Other non-interest income.” Changes in fair value include changes due to valuation assumptions, primarily discount rates and prepayment speeds, as well as other changes such as runoff and the passage of time. The amount of net unrealized losses included in earnings for the years ended December 31, 2018, 2017 and 2016 that were related to servicing rights held at December 31, 2018, 2017 and 2016 totaled approximately $1.5 million, $1.0 million and $1.8 million, respectively, and were primarily due to changes in discount rates and prepayment speeds.

Securities for which fair value measurements are categorized in level 3 of the fair value hierarchy at December 31, 2018 consisted of pooled trust preferred securities with a fair value of $5 million and private label residential MBS and CMOs with a fair value of $35 million. The trust preferred securities are not material to the Company’s financial statements. Private label residential MBS consisted of senior and mezzanine tranches collateralized by prime fixed rate and hybrid 1-4 single family residential mortgages originated before 2005. Substantially all of these securities have variable rate coupons. Weighted average subordination levels at December 31, 2018 were 12.8% and 10.1% for investment grade and non-investment grade securities, respectively.

The following table provides information about the valuation techniques and unobservable inputs used in the valuation of private label residential MBS and CMOs falling within level 3 of the fair value hierarchy as of December 31, 2018 (dollars in thousands):



	Fair Value at		Valuation Technique	Unobservable Input	Range (Weighted Average)
	December 31, 2018		Valuation Technique	Unobservable Input	Range (Weighted Average)
Investment grade	$	22,675	Discounted cash flow	Voluntary prepayment rate	4.30% - 25.50% (12.28%)
				Probability of default	0.00% - 5.85% (1.03%)
				Loss severity	15.00% - 100.00% (18.84%)
				Discount rate	2.35% - 7.71% (2.95%)

Non-investment grade	$	12,009	Discounted cash flow	Voluntary prepayment rate	1.20% - 25.00% (16.51%)
				Probability of default	0.00% - 5.85% (2.31%)
				Loss severity	15.00% - 76.60% (29.16%)
				Discount rate	1.06% - 9.95% (4.91%)

The significant unobservable inputs impacting the fair value measurement of private label residential MBS and CMOs include voluntary prepayment rates, probability of default, loss severity given default and discount rates. Generally, increases in probability of default, loss severity or discount rates would result in a lower fair value measurement. Alternatively, decreases in probability of default, loss severity or discount rates would result in a higher fair value measurement. For securities with less favorable credit characteristics, decreases in voluntary prepayment speeds may be interpreted as a deterioration in the overall credit quality of the underlying collateral and as such, lead to lower fair value measurements. The fair value measurements of those securities with higher levels of subordination will be less sensitive to changes in these unobservable inputs other than discount rates, while securities with lower levels of subordination will show a higher degree of sensitivity to changes in these unobservable inputs other than discount rates. Generally, a change in the assumption used for probability of default is accompanied by a directionally similar change in the assumption used for loss severity given default and a directionally opposite change in the assumption used for voluntary prepayment rate.

The following table provides information about the valuation techniques and significant unobservable inputs used in the valuation of servicing rights as of December 31, 2018 (dollars in thousands):



	Fair Value at		Valuation Technique	Unobservable Input	Range (Weighted Average)
	December 31, 2018		Valuation Technique	Unobservable Input	Range (Weighted Average)
Commercial servicing rights	$	9,525	Discounted cash flow	Prepayment rate	2.82% - 17.09% (12.34%)
				Discount rate	4.84% - 17.07% (13.33%)

Increases in prepayment rates or discount rates would result in lower fair value measurements and decreases in prepayment rates or discount rates would result in higher fair value measurements. Although the prepayment rate and the discount rate are not directly interrelated, they generally move in opposite directions.

Assets and liabilities measured at fair value on a non-recurring basis

Following is a description of the methodologies used to estimate the fair values of assets and liabilities that may be measured at fair value on a non-recurring basis, and the level within the fair value hierarchy in which those measurements are typically classified.

Impaired loans, OREO and other repossessed assets—The carrying amount of collateral dependent impaired loans is typically based on the fair value of the underlying collateral, which may be real estate, taxi medallions, or other business assets, less estimated costs to sell. The carrying value of OREO is initially measured based on the fair value of the real estate acquired in foreclosure and subsequently adjusted to the lower of cost or estimated fair value, less estimated cost to sell. Fair values of real estate collateral and OREO are typically based on third-party real estate appraisals which utilize market and income approaches to valuation incorporating both observable and unobservable inputs. When current appraisals are not available, the Company may use brokers’ price opinions, home price indices or other available information about changes in real estate market conditions to adjust the latest appraised value available. These adjustments to appraised values may be subjective and involve significant management judgment. The fair value of repossessed assets, other than taxi medallions, or collateral consisting of other business assets may be based on third-party appraisals or internal analyses that use market approaches to valuation incorporating primarily unobservable inputs. The valuation of New York City taxi medallions is based on prices obtained in a fourth quarter 2018 sale of taxi medallion loans and repossessed taxi medallions. At December 31, 2018, the Company's investment in taxi medallion loans and repossessed taxi medallions was not material.

Fair value measurements related to collateral dependent impaired loans, OREO and other repossessed assets are classified within levels 2 and 3 of the fair value hierarchy.

Equipment under operating lease—Fair values of equipment under operating lease are typically based upon discounted

cash flow analysis, considering expected lease rates and estimated end of life residual values. These fair value measurements are classified within level 3 of the fair value hierarchy.

The following tables present the carrying value of assets for which non-recurring changes in fair value have been recorded for the periods indicated (in thousands):



	2018
									Losses from Fair Value Changes
	Level 1		Level 2		Level 3		Total		Year Ended December 31, 2018
OREO and repossessed assets	$	—	$	1,085	$	486	$	1,571	$	(1,864	)
Impaired loans	$	—	$	775	$	35,397	$	36,172	$	(6,816	)



	2017
									Losses from Fair Value Changes
	Level 1		Level 2		Level 3		Total		Year Ended December 31, 2017
OREO and repossessed assets	$	—	$	—	$	5,790	$	5,790	$	(2,078	)
Impaired loans	$	—	$	—	$	93,051	$	93,051	$	(65,716	)



	2016
									Losses from Fair Value Changes
	Level 1		Level 2		Level 3		Total		Year Ended December 31, 2016
OREO and repossessed assets	$	—	$	—	$	12,466	$	12,466	$	(1,156	)
Impaired loans	$	—	$	—	$	78,121	$	78,121	$	(25,573	)
Equipment under operating lease	$	—	$	—	$	8,173	$	8,173	$	(4,100	)

Included in the tables above are impaired taxi medallion loans with carrying values of $0.8 million, $86.0 million and $50.7 million at December 31, 2018, 2017 and 2016, respectively, the majority of which were in New York City. Losses from fair value changes included in the tables above include $0.5 million, $62.4 million and $12.7 million were recognized on impaired taxi medallion loans during the years ended December 31, 2018, 2017 and 2016, respectively. In addition, OREO and repossessed assets reported above included repossessed taxi medallions with carrying values of $1.1 million, $2.1 million and $2.5 million at December 31, 2018, 2017 and 2016, respectively. Losses of $1.0 million, $1.3 million and $0.2 million were recognized on repossessed taxi medallions during the years ended December 31, 2018, 2017 and 2016, respectively.

The following table presents the carrying value and fair value of financial instruments and the level within the fair value hierarchy in which those measurements are classified at December 31, 2018 and 2017 (dollars in thousands):



		2018				2017
	Level	Carrying Value		Fair Value		Carrying Value		Fair Value
Assets:
Cash and cash equivalents	1	$	382,073	$	382,073	$	194,582	$	194,582
Investment securities	1/2/3	8,166,878		8,167,127		6,690,832		6,690,832
Non-marketable equity securities	2	267,052		267,052		265,989		265,989
Loans held for sale	2	36,992		39,931		34,097		37,847
Loans:
Covered	3	201,346		207,813		502,860		922,888
Non-covered	3	21,665,731		21,660,445		20,768,849		20,759,567
FDIC indemnification asset	3	—		—		295,635		148,356
Derivative assets	2	29,615		29,615		27,627		27,627
Liabilities:
Demand, savings and money market deposits	2	$	16,654,465	$	16,654,465	$	15,543,637	$	15,543,637
Time deposits	2	6,819,758		6,820,355		6,334,842		6,324,010
Federal funds purchased	2	175,000		175,000		—		—
FHLB advances	2	4,796,000		4,810,446		4,771,000		4,774,160
Notes and other borrowings	2	402,749		416,142		402,830		435,361
Derivative liabilities	2	23,874		23,874		25,373		25,373

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Commitments and Contingencies

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

The Company issues off-balance sheet financial instruments to meet the financing needs of its customers. These financial instruments include commitments to fund loans, unfunded commitments under existing lines of credit, and commercial and standby letters of credit. These commitments expose the Company to varying degrees of credit and market risk which are essentially the same as those involved in extending loans to customers, and are subject to the same credit policies used in underwriting loans. Collateral may be obtained based on the Company’s credit evaluation of the counterparty. The Company’s maximum exposure to credit loss is represented by the contractual amount of these commitments.

Commitments to fund loans

These are agreements to lend funds to customers as long as there is no violation of any condition established in the contract. Commitments to fund loans generally have fixed expiration dates or other termination clauses and may require payment of a fee. Many of these commitments are expected to expire without being funded and, therefore, the total commitment amounts do not necessarily represent future liquidity requirements.

Unfunded commitments under lines of credit

Unfunded commitments under lines of credit include commercial, commercial real estate, home equity and consumer lines of credit to existing customers. Some of these commitments may mature without being fully funded.

Commercial and standby letters of credit

Letters of credit are conditional commitments issued by the Company to guarantee the performance of a customer to a third party. These letters of credit are primarily issued to support trade transactions or guarantee arrangements. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan facilities to customers.

Total lending related commitments outstanding at December 31, 2018 were as follows (in thousands):



Commitments to fund loans	$	508,074
Commitments to purchase loans	518,054
Unfunded commitments under lines of credit	2,853,431
Commercial and standby letters of credit	85,446
	$	3,965,005

Legal Proceedings

The Company is involved as plaintiff or defendant in various legal actions arising in the normal course of business. In the opinion of management, based upon advice of legal counsel, the likelihood is remote that the impact of these proceedings, either individually or in the aggregate, would be material to the Company’s consolidated financial position, results of operations or cash flows.

Condensed Financial Statements of BankUnited, Inc.

12 Months Ended

Dec. 31, 2018

Condensed Financial Statements [Abstract]

Condensed Financial Information of Parent Company Only Disclosure [Text Block]

Condensed Financial Statements of BankUnited, Inc.

Condensed financial statements of BankUnited, Inc. are presented below (in thousands):

Condensed Balance Sheets



	December 31, 2018		December 31, 2017
Assets:
Cash and cash equivalents	$	143,843	$	131,696
Investment securities available for sale, at fair value	60,519		63,543
Investment in BankUnited, N.A.	3,110,638		3,239,717
Deferred tax asset, net	10,088		9,456
Other assets	27,319		8,462
Total assets	$	3,352,407	$	3,452,874
Liabilities and Stockholders' Equity:
Notes payable	$	394,390	$	393,725
Other liabilities	34,184		33,087
Stockholders' equity	2,923,833		3,026,062
Total liabilities and stockholders' equity	$	3,352,407	$	3,452,874

Condensed Statements of Income



	Years Ended December 31,
	2018			2017			2016
Income:
Interest and dividends on investment securities available for sale	$	3,532		$	3,580		$	4,280
Service fees from subsidiary	21,000			18,787			21,957
Equity in earnings of subsidiary	349,937			639,250			242,874
Loss on investment securities	(2,805		)	—			—
Total	371,664			661,617			269,111
Expense:
Interest on borrowings	20,165			20,132			20,100
Employee compensation and benefits	28,477			27,032			27,143
Other	5,617			5,047			4,466
Total	54,259			52,211			51,709
Income before income taxes	317,405			609,406			217,402
Benefit for income taxes	(7,461		)	(4,867		)	(8,339		)
Net income	$	324,866		$	614,273		$	225,741

Condensed Statements of Cash Flows



	Years Ended December 31,
	2018			2017			2016
Cash flows from operating activities:
Net income	$	324,866		$	614,273		$	225,741
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed earnings of subsidiaries	70,064			(519,250		)	(157,374		)
Equity based compensation	23,137			22,692			18,032
Other	(15,654		)	3,343			7,438
Net cash provided by operating activities	402,413			121,058			93,837
Cash flows from investing activities:
Capital contributions to subsidiary	—			(55,000		)	—
Purchase of investment securities available for sale	—			—			(20,150		)
Proceeds from repayments, sale, maturities and calls of investment securities available for sale	—			15,000			19,401
Other	(156		)	(250		)	(3		)
Net cash used in investing activities	(156		)	(40,250		)	(752		)
Cash flows from financing activities:
Dividends paid	(91,305		)	(91,628		)	(89,824		)
Proceeds from exercise of stock options	7,727			62,095			791
Repurchase of common stock	(299,972		)	—			—
Other	(6,560		)	(7,297		)	856
Net cash used in financing activities	(390,110		)	(36,830		)	(88,177		)
Net increase in cash and cash equivalents	12,147			43,978			4,908
Cash and cash equivalents, beginning of period	131,696			87,718			82,810
Cash and cash equivalents, end of period	$	143,843		$	131,696		$	87,718
Supplemental schedule of non-cash investing and financing activities:
Dividends declared, not paid	$	21,673		$	23,055		$	22,510

Dividends received by BankUnited, Inc. from the Bank totaled $420 million, $120 million and $85.5 million for the years ended December 31, 2018, 2017, and 2016, respectively.

- Definition

The entire disclosure for condensed financial information, including the financial position, cash flows, and the results of operations of the registrant (parent company) as of the same dates or for the same periods for which audited consolidated financial statements are being presented. Alternatively, the details of this disclosure can be reported by the specific parent company taxonomy elements, indicating the appropriate date and period contexts in an instance document.

+ References + Details

Quarterly Financial Information (Unaudited)

6 Months Ended

12 Months Ended

Jun. 30, 2018

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Information [Table Text Block]

Note 18 Quarterly Financial Information (Unaudited)

Financial information by quarter for the years ended December 31, 2018 and 2017 follows (in thousands, except per share data):



	2018
	Fourth Quarter		Third Quarter		Second Quarter		First Quarter		Total
Interest income	$	414,796	$	357,717	$	348,855	$	327,776	$	1,449,144
Interest expense	119,743		105,749		93,592		79,967		399,051
Net interest income before provision for loan losses	295,053		251,968		255,263		247,809		1,050,093
Provision for loan losses	12,583		1,200		8,995		3,147		25,925
Net interest income after provision for loan losses	282,470		250,768		246,268		244,662		1,024,168
Non-interest income	33,328		38,735		31,973		27,986		132,022
Non-interest expense	246,678		170,798		161,247		161,817		740,540
Income before income taxes	69,120		118,705		116,994		110,831		415,650
Provision for income taxes	16,717		21,377		27,094		25,596		90,784
Net income	$	52,403	$	97,328	$	89,900	$	85,235	$	324,866
Earnings per common share, basic	$	0.50	$	0.90	$	0.82	$	0.78	$	3.01
Earnings per common share, diluted	$	0.50	$	0.90	$	0.82	$	0.77	$	2.99



	2017
	Fourth Quarter			Third Quarter		Second Quarter		First Quarter		Total
Interest income	$	312,645		$	309,443	$	298,835	$	283,538	$	1,204,461
Interest expense	73,819			68,179		59,246		52,945		254,189
Net interest income before provision for loan losses	238,826			241,264		239,589		230,593		950,272
Provision for loan losses	5,174			37,854		13,619		12,100		68,747
Net interest income after provision for loan losses	233,652			203,410		225,970		218,493		881,525
Non-interest income	46,541			53,326		29,893		28,144		157,904
Non-interest expense	161,271			156,705		160,435		156,557		634,968
Income before income taxes	118,922			100,031		95,428		90,080		404,461
Provision (benefit) for income taxes	(298,872		)	32,252		29,021		27,787		(209,812		)
Net income	$	417,794		$	67,779	$	66,407	$	62,293	$	614,273
Earnings per common share, basic	$	3.80		$	0.62	$	0.60	$	0.57	$	5.60
Earnings per common share, diluted	$	3.79		$	0.62	$	0.60	$	0.57	$	5.58

Earnings for the fourth quarter 2017 benefited from a discrete income tax benefit of $327.9 million. See Note 10 to the consolidated financial statements for more information about the discrete income tax benefit.

Quarterly Financial Information (Unaudited)

Financial information by quarter for the years ended December 31, 2018 and 2017 follows (in thousands, except per share data):



	2018
	Fourth Quarter		Third Quarter		Second Quarter		First Quarter		Total
Interest income	$	414,796	$	357,717	$	348,855	$	327,776	$	1,449,144
Interest expense	119,743		105,749		93,592		79,967		399,051
Net interest income before provision for loan losses	295,053		251,968		255,263		247,809		1,050,093
Provision for loan losses	12,583		1,200		8,995		3,147		25,925
Net interest income after provision for loan losses	282,470		250,768		246,268		244,662		1,024,168
Non-interest income	33,328		38,735		31,973		27,986		132,022
Non-interest expense	246,678		170,798		161,247		161,817		740,540
Income before income taxes	69,120		118,705		116,994		110,831		415,650
Provision for income taxes	16,717		21,377		27,094		25,596		90,784
Net income	$	52,403	$	97,328	$	89,900	$	85,235	$	324,866
Earnings per common share, basic	$	0.50	$	0.90	$	0.82	$	0.78	$	3.01
Earnings per common share, diluted	$	0.50	$	0.90	$	0.82	$	0.77	$	2.99



	2017
	Fourth Quarter			Third Quarter		Second Quarter		First Quarter		Total
Interest income	$	312,645		$	309,443	$	298,835	$	283,538	$	1,204,461
Interest expense	73,819			68,179		59,246		52,945		254,189
Net interest income before provision for loan losses	238,826			241,264		239,589		230,593		950,272
Provision for loan losses	5,174			37,854		13,619		12,100		68,747
Net interest income after provision for loan losses	233,652			203,410		225,970		218,493		881,525
Non-interest income	46,541			53,326		29,893		28,144		157,904
Non-interest expense	161,271			156,705		160,435		156,557		634,968
Income before income taxes	118,922			100,031		95,428		90,080		404,461
Provision (benefit) for income taxes	(298,872		)	32,252		29,021		27,787		(209,812		)
Net income	$	417,794		$	67,779	$	66,407	$	62,293	$	614,273
Earnings per common share, basic	$	3.80		$	0.62	$	0.60	$	0.57	$	5.60
Earnings per common share, diluted	$	3.79		$	0.62	$	0.60	$	0.57	$	5.58

Subsequent events Subsequent Events (Notes)	12 Months Ended
Subsequent events Subsequent Events (Notes)	Dec. 31, 2018
Subsequent Event [Line Items]
Subsequent Events [Text Block]	Note 19 Subsequent Events Termination of Single Family Shared-Loss Agreement On February 13, 2019, the Bank entered into a termination agreement with the FDIC that terminated the Bank’s Single Family Shared-Loss Agreement with the FDIC effective immediately. The Bank has made a payment of approximately seven thousand dollars to the FDIC in connection with the termination and all rights and obligations of the Bank and the FDIC under the Single Family Shared-Loss Agreement have been terminated.

Basis of Presentation and Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Use of Estimates, Policy [Policy Text Block]

Accounting Estimates

Consolidation, Policy [Policy Text Block]

Principles of Consolidation

Fair Value Measurement, Policy [Policy Text Block]

Fair Value Measurements


•	Level 1 inputs are unadjusted quoted prices in active markets that are accessible at the measurement date for identical assets or liabilities.


•	Level 2 inputs are observable inputs other than level 1 inputs, including quoted prices for similar assets and liabilities, quoted prices for identical assets and liabilities in less active markets and other inputs that can be corroborated by observable market data.


•	Level 3 inputs are unobservable inputs supported by limited or no market activity or data and inputs requiring significant management judgment or estimation.

Cash and Cash Equivalents, Policy [Policy Text Block]

Cash and Cash Equivalents

Marketable Securities, Available-for-sale Securities, Policy [Policy Text Block]

Investment Securities


•	the Company's intent to hold the security until maturity or for a period of time sufficient for a recovery in value;


•	whether it is more likely than not that the Company will be required to sell the security prior to recovery of its amortized cost basis;


•	the length of time and extent to which fair value has been less than amortized cost;


•	adverse changes in expected cash flows;


•	collateral values and performance;


•	the payment structure of the security including levels of subordination or over-collateralization;


•	changes in the economic or regulatory environment;


•	the general market condition of the geographic area or industry of the issuer;


•	the issuer's financial condition, performance and business prospects; and


•	changes in credit ratings.

The relative importance assigned to each of these factors varies depending on the facts and circumstances pertinent to the individual security being evaluated.

Nonmarketable Equity Securities [Policy Text Block]

Non-marketable Equity Securities

Finance, Loan and Lease Receivables, Held-for-sale, Policy [Policy Text Block]

Loans Held for Sale

Finance, Loan and Lease Receivables, Held-for-investment, Policy [Policy Text Block]

Loans

Non-covered Loans

Non-covered loans, other than non-covered ACI loans, are carried at UPB, net of premiums, discounts, unearned income, deferred loan origination fees and costs, and the ALLL

Direct Financing Leases

ACI Loans [Policy Text Block]

ACI Loans


•	delinquency status;


•	product type, in particular, amortizing as opposed to option ARMs;


•	loan-to-value ratio; and


•	borrower FICO score.

Non-ACI Loans [Policy Text Block]

Covered Non-ACI Loans

Loans and Leases Receivable, Nonaccrual Loan and Lease Status, Policy [Policy Text Block]

Non-accrual Loans

Contractually delinquent ACI loans are not classified as non-accrual as long as discount continues to be accreted on the loans or pools.

Impaired Financing Receivable, Policy [Policy Text Block]

Impaired Loans

Loans and Leases Receivable, Troubled Debt Restructuring Policy [Policy Text Block]

Troubled Debt Restructurings

Loans and Leases Receivable, Allowance for Loan Losses Policy [Policy Text Block]

Allowance for Loan and Lease Losses

Commercial loans

Residential and other consumer loans

Non-covered Loans

Covered non-ACI Loans

Qualitative Factors


•	Portfolio performance trends, including trends in and the levels of delinquencies, non-performing loans and classified loans;


•	Changes in the nature of the portfolio and terms of the loans, specifically including the volume and nature of policy and procedural exceptions;


•	Portfolio growth trends;


•	Changes in lending policies and procedures, including credit and underwriting guidelines and portfolio management practices;


•	Economic factors, including unemployment rates and GDP growth rates and other factors considered relevant by management;


•	Changes in the value of underlying collateral;


•	Quality of risk ratings, as evaluated by our independent credit review function;


•	Credit concentrations;


•	Changes in and experience levels of credit administration management and staff; and


•	Other factors identified by management that may impact the level of losses inherent in the portfolio, including but not limited to competition and legal and regulatory considerations.

Covered ACI Loans

Reserve for Unfunded Commitments

FDIC Indemnification Asset [Policy Text Block]

FDIC Indemnification Asset

Bank Owned Life Insurance [Policy Text Block]

Bank Owned Life Insurance

Lessor, Leases [Policy Text Block]

Equipment Under Operating Lease

Goodwill and Intangible Assets, Policy [Policy Text Block]

Goodwill

Finance, Loan and Lease Receivables, Held for Investments, Foreclosed Assets Policy [Policy Text Block]

Foreclosed Property and Repossessed Assets

Property, Plant and Equipment, Policy [Policy Text Block]

Premises and Equipment


•	buildings and improvements - 30 years;


•	leasehold improvements - 5 to 20 years;


•	furniture, fixtures and equipment - 5 to 7 years; and


•	computer equipment - 3 to 5 years.

Software and CCA [Table Text Block]

Software and CCA

Transfers and Servicing of Financial Assets, Servicing of Financial Assets, Policy [Policy Text Block]

Loan Servicing Rights

Investments in Affordable Housing Limited Partnerships [Policy Text Block]

Investments in Affordable Housing Limited Partnerships

Income Tax, Policy [Policy Text Block]

Income Taxes

Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]

Equity Based Compensation

Derivatives, Policy [Policy Text Block]

Derivative Financial Instruments and Hedging Activities

Interest rate derivative contracts

Cash flows resulting from derivative financial instruments that are accounted for as hedges are classified in the cash flow statement in the same category as the cash flows from the hedged items.

Changes in the fair value of interest rate contracts not designated as, or not qualifying as, hedging instruments are recognized currently in earnings.

Transfers and Servicing of Financial Assets, Transfers of Financial Assets, Financings, Policy [Policy Text Block]

Transfers of Financial Assets

Advertising Costs, Policy [Policy Text Block]

Advertising Costs

Advertising costs are expensed as incurred.

Earnings Per Share, Policy [Policy Text Block]

Earnings per Common Share

Revenue Recognition, Policy [Policy Text Block]

Revenue From Contracts with Customers

Reclassification, Policy [Policy Text Block]

Reclassifications

Certain amounts presented for prior periods have been reclassified to conform to the current period presentation.

New Accounting Pronouncements, Policy [Policy Text Block]

New Accounting Pronouncements Adopted in 2018

Description of New Accounting Pronouncements Not yet Adopted [Text Block]

Accounting Pronouncements Not Yet Adopted

Earnings Per Common Share (Tables)

12 Months Ended

Dec. 31, 2018

Earnings Per Share [Abstract]

Computation of Basic and Diluted Earnings Per Common Share

The computation of basic and diluted earnings per common share is presented below for the years ended December 31, 2018, 2017 and 2016 (in thousands, except share and per share data):



c	2018			2017			2016
Basic earnings per common share:
Numerator:
Net income	$	324,866		$	614,273		$	225,741
Distributed and undistributed earnings allocated to participating securities	(13,047		)	(23,250		)	(8,760		)
Income allocated to common stockholders for basic earnings per common share	$	311,819		$	591,023		$	216,981
Denominator:
Weighted average common shares outstanding	104,916,865			106,574,448			104,097,182
Less average unvested stock awards	(1,171,994		)	(1,104,035		)	(1,157,378		)
Weighted average shares for basic earnings per common share	103,744,871			105,470,413			102,939,804
Basic earnings per common share	$	3.01		$	5.60		$	2.11
Diluted earnings per common share:
Numerator:
Income allocated to common stockholders for basic earnings per common share	$	311,819		$	591,023		$	216,981
Adjustment for earnings reallocated from participating securities	(195		)	(263		)	62
Income used in calculating diluted earnings per common share	$	311,624		$	590,760		$	217,043
Denominator:
Weighted average shares for basic earnings per common share	103,744,871			105,470,413			102,939,804
Dilutive effect of stock options	332,505			387,074			716,366
Weighted average shares for diluted earnings per common share	104,077,376			105,857,487			103,656,170
Diluted earnings per common share	$	2.99		$	5.58		$	2.09

Potentially Dilutive Securities Outstanding Categorized



	2018	2017	2016
Unvested shares and share units	1,463,607	1,431,761	1,303,208
Stock options and warrants	1,960	1,850,279	1,850,279

Investment Securities (Tables)

12 Months Ended

Dec. 31, 2018

Investments, Debt and Equity Securities [Abstract]

Schedule of Available-for-sale Securities Reconciliation



	2018
	Amortized Cost		Gross Unrealized					Carrying Value ⁽¹⁾
	Amortized Cost		Gains		Losses			Carrying Value ⁽¹⁾
Investment securities available for sale:
U.S. Treasury securities	$	39,885	$	2	$	(14	)	$	39,873
U.S. Government agency and sponsored enterprise residential MBS	1,885,302		16,580		(4,408		)	1,897,474
U.S. Government agency and sponsored enterprise commercial MBS	374,569		1,293		(1,075		)	374,787
Private label residential MBS and CMOs	1,539,058		10,138		(14,998		)	1,534,198
Private label commercial MBS	1,486,835		5,021		(6,140		)	1,485,716
Single family rental real estate-backed securities	406,310		266		(4,118		)	402,458
Collateralized loan obligations	1,239,355		1,060		(5,217		)	1,235,198
Non-mortgage asset-backed securities	204,372		1,031		(1,336		)	204,067
State and municipal obligations	398,810		3,684		(4,065		)	398,429
SBA securities	514,765		6,502		(1,954		)	519,313
Other debt securities	1,393		3,453		—			4,846
	8,090,654		$	49,030	$	(43,325	)	8,096,359
Marketable equity securities	60,519							60,519
Investment securities held to maturity	10,000							10,000
	$	8,161,173						$	8,166,878



	2017
	Amortized Cost		Gross Unrealized					Carrying Value ⁽¹⁾
	Amortized Cost		Gains		Losses			Carrying Value ⁽¹⁾
Investment securities available for sale:
U.S. Treasury securities	$	24,981	$	—	$	(28	)	$	24,953
U.S. Government agency and sponsored enterprise residential MBS	2,043,373		16,094		(1,440		)	2,058,027
U.S. Government agency and sponsored enterprise commercial MBS	233,522		1,330		(344		)	234,508
Private label residential MBS and CMOs	613,732		16,473		(1,958		)	628,247
Private label commercial MBS	1,033,022		13,651		(258		)	1,046,415
Single family rental real estate-backed securities	559,741		3,823		(858		)	562,706
Collateralized loan obligations	720,429		3,252		—			723,681
Non-mortgage asset-backed securities	119,939		1,808		—			121,747
Marketable equity securities	59,912		3,631		—			63,543
State and municipal obligations	640,511		17,606		(914		)	657,203
SBA securities	534,534		16,208		(60		)	550,682
Other debt securities	4,090		5,030		—			9,120
	6,587,786		$	98,906	$	(5,860	)	6,680,832
Investment securities held to maturity	10,000							10,000
	$	6,597,786						$	6,690,832


(1)	At fair value except for securities held to maturity.

Investments Classified by Contractual Maturity Date



	Amortized Cost		Fair Value
Due in one year or less	$	939,802	$	942,507
Due after one year through five years	4,097,200		4,097,966
Due after five years through ten years	2,662,298		2,662,649
Due after ten years	391,354		393,237
	$	8,090,654	$	8,096,359

Gain on Investment Securities, net

The following table provides information about gains and losses on investment securities for the years ended December 31, 2018, 2017 and 2016 (in thousands):



	2018			2017			2016
Proceeds from sale of investment securities available for sale	$	1,030,810		$	1,287,591		$	1,127,983

Gross realized gains:
Investment securities available for sale	$	8,616		$	37,530		$	14,924
Gross realized losses:
Investment securities available for sale	(2,514		)	(4,064		)	—
Net realized gain	6,102			33,466			14,924

Net unrealized losses on marketable equity securities recognized in earnings	(2,943		)	—			—

OTTI on investment securities available for sale	—			—			(463		)

Gain on investment securities, net	$	3,159		$	33,466		$	14,461

Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value



	2018
	Less than 12 Months					12 Months or Greater					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
U.S. Treasury securities	$	14,921	$	(14	)	$	—	$	—		$	14,921	$	(14	)
U.S. Government agency and sponsored enterprise residential MBS	450,666		(1,828		)	87,311		(2,580		)	537,977		(4,408		)
U.S. Government agency and sponsored enterprise commercial MBS	146,096		(352		)	25,815		(723		)	171,911		(1,075		)
Private label residential MBS and CMOs	759,921		(7,073		)	278,108		(7,925		)	1,038,029		(14,998		)
Private label commercial MBS	742,092		(5,371		)	39,531		(769		)	781,623		(6,140		)
Single family rental real estate-backed securities	234,305		(1,973		)	85,282		(2,145		)	319,587		(4,118		)
Collateralized loan obligations	749,047		(5,217		)	—		—			749,047		(5,217		)
Non-mortgage asset-backed securities	136,100		(1,336		)	—		—			136,100		(1,336		)
State and municipal obligations	208,971		(3,522		)	46,247		(543		)	255,218		(4,065		)
SBA securities	215,975		(1,391		)	31,481		(563		)	247,456		(1,954		)
	$	3,658,094	$	(28,077	)	$	593,775	$	(15,248	)	$	4,251,869	$	(43,325	)



	2017
	Less than 12 Months					12 Months or Greater					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
U.S. Treasury securities	$	24,953	$	(28	)	$	—	$	—		$	24,953	$	(28	)
U.S. Government agency and sponsored enterprise residential MBS	471,120		(1,141		)	13,028		(299		)	484,148		(1,440		)
U.S. Government agency and sponsored enterprise commercial MBS	26,265		(344		)	—		—			26,265		(344		)
Private label residential MBS and CMOs	330,068		(1,858		)	5,083		(100		)	335,151		(1,958		)
Private label commercial MBS	81,322		(258		)	—		—			81,322		(258		)
Single family rental real estate-backed securities	94,750		(858		)	—		—			94,750		(858		)
State and municipal obligations	30,715		(49		)	60,982		(865		)	91,697		(914		)
SBA securities	21,300		(10		)	15,427		(50		)	36,727		(60		)
	$	1,080,493	$	(4,546	)	$	94,520	$	(1,314	)	$	1,175,013	$	(5,860	)

Loans and Allowance for Loan and Lease Losses (Tables)

12 Months Ended

Dec. 31, 2018

Financing Receivable, Impaired [Line Items]

Allowance for Loan and Lease Losses Rolforward [Table Text Block]

Activity in the ALLL for the years ended December 31, 2018, 2017 and 2016 is summarized in the tables below (in thousands):



	2018
	Residential and Other Consumer			Commercial			Total
Beginning balance	$	10,720		$	134,075		$	144,795
Provision for loan losses:
Covered loans	752			—			752
Non-covered loans	280			24,893			25,173
Total provision	1,032			24,893			25,925
Charge-offs:
Covered loans	(1,200		)	—			(1,200		)
Non-covered loans	(265		)	(65,619		)	(65,884		)
Total charge-offs	(1,465		)	(65,619		)	(67,084		)
Recoveries:
Covered loans	220			—			220
Non-covered loans	281			5,794			6,075
Total recoveries	501			5,794			6,295
Ending balance	$	10,788		$	99,143		$	109,931



	2017
	Residential and Other Consumer			Commercial			Total
Beginning balance	$	11,503		$	141,450		$	152,953
Provision for (recovery of) loan losses:
Covered loans	1,418			(60		)	1,358
Non-covered loans	1,034			66,355			67,389
Total provision	2,452			66,295			68,747
Charge-offs:
Covered loans	(3,327		)	—			(3,327		)
Non-covered loans	(1		)	(77,865		)	(77,866		)
Total charge-offs	(3,328		)	(77,865		)	(81,193		)
Recoveries:
Covered loans	67			60			127
Non-covered loans	26			4,135			4,161
Total recoveries	93			4,195			4,288
Ending balance	$	10,720		$	134,075		$	144,795



	2016
	Residential and Other Consumer			Commercial			Total
Beginning balance	$	16,211		$	109,617		$	125,828
Provision for (recovery of) loan losses:
Covered loans	(1,632		)	(49		)	(1,681		)
Non-covered loans	(1,814		)	54,406			52,592
Total provision	(3,446		)	54,357			50,911
Charge-offs:
Covered loans	(1,216		)	—			(1,216		)
Non-covered loans	(152		)	(25,742		)	(25,894		)
Total charge-offs	(1,368		)	(25,742		)	(27,110		)
Recoveries:
Covered loans	80			49			129
Non-covered loans	26			3,169			3,195
Total recoveries	106			3,218			3,324
Ending balance	$	11,503		$	141,450		$	152,953

Allowance for Credit Losses on Financing Receivables

The following table presents information about the balance of the ALLL and related loans as of December 31, 2018 and 2017 (in thousands):



	2018						2017
	Residential and Other Consumer		Commercial		Total		Residential and Other Consumer		Commercial		Total
Allowance for loan and lease losses:
Ending balance	$	10,788	$	99,143	$	109,931	$	10,720	$	134,075	$	144,795
Covered loans:
Ending balance	$	30	$	—	$	30	$	258	$	—	$	258
Ending balance: non-ACI loans individually evaluated for impairment	$	—	$	—	$	—	$	118	$	—	$	118
Ending balance: non-ACI loans collectively evaluated for impairment	$	30	$	—	$	30	$	140	$	—	$	140
Non-covered loans:
Ending balance	$	10,758	$	99,143	$	109,901	$	10,462	$	134,075	$	144,537
Ending balance: loans individually evaluated for impairment	$	134	$	12,143	$	12,277	$	63	$	18,776	$	18,839
Ending balance: loans collectively evaluated for impairment	$	10,624	$	87,000	$	97,624	$	10,399	$	115,299	$	125,698
Loans:
Covered loans:
Ending balance	$	201,376	$	—	$	201,376	$	503,118	$	—	$	503,118
Ending balance: non-ACI loans individually evaluated for impairment	$	—	$	—	$	—	$	2,221	$	—	$	2,221
Ending balance: non-ACI loans collectively evaluated for impairment	$	11,153	$	—	$	11,153	$	21,829	$	—	$	21,829
Ending balance: ACI loans	$	190,223	$	—	$	190,223	$	479,068	$	—	$	479,068
Non-covered loans:
Ending balance	$	4,747,604	$	17,028,028	$	21,775,632	$	4,196,080	$	16,717,306	$	20,913,386
Ending balance: loans, other than ACI loans, individually evaluated for impairment	$	7,690	$	108,841	$	116,531	$	1,234	$	173,706	$	174,940
Ending balance: loans, other than ACI loans, collectively evaluated for impairment	$	4,739,914	$	16,901,262	$	21,641,176	$	4,194,846	$	16,509,824	$	20,704,670
Ending balance: ACI loans	$	—	$	17,925	$	17,925	$	—	$	33,776	$	33,776

Schedule of Future Minimum Lease Payments for Capital Leases [Table Text Block]

As of December 31, 2018, future minimum lease payments to be received under direct financing leases were as follows (in thousands):



Years Ending December 31:
2019	$	197,004
2020	169,437
2021	109,057
2022	69,242
2023	56,312
Thereafter	207,869
	$	808,921

Concentration Risk Disclosure [Text Block]

Loan Concentrations:



	2018
							Percent of Total
	Non-Covered Loans		Covered Loans		Total		Non-Covered Loans		Total Loans
California	$	1,172,470	$	4,751	$	1,177,221	26.3	%	25.2	%
New York	971,121		6,025		977,146		21.8	%	20.9	%
Florida	520,427		124,593		645,020		11.7	%	13.8	%
DC	182,399		812		183,211		4.1	%	3.9	%
Virginia	179,132		5,624		184,756		4.0	%	4.0	%
Others	1,437,995		59,571		1,497,566		32.1	%	32.2	%
	$	4,463,544	$	201,376	$	4,664,920	100.0	%	100.0	%



	2017
							Percent of Total
	Non-Covered Loans		Covered Loans		Total		Non-Covered Loans		Total Loans
California	$	1,094,047	$	23,780	$	1,117,827	26.4	%	24.0	%
New York	871,331		16,847		888,178		21.0	%	19.1	%
Florida	526,540		281,396		807,936		12.7	%	17.4	%
Virginia	181,912		22,290		204,202		4.4	%	4.4	%
DC	169,502		1,933		171,435		4.1	%	3.7	%
Others	1,302,547		156,872		1,459,419		31.4	%	31.4	%
	$	4,145,879	$	503,118	$	4,648,997	100.0	%	100.0	%

Foreclosure of residential real estate

Past Due Financing Receivables [Table Text Block]

The following table presents an aging of loans as of December 31, 2018 and 2017. Amounts include premiums, discounts and deferred fees and costs (in thousands):



	2018										2017
	Current		30 - 59 Days Past Due		60 - 89 Days Past Due		90 Days or More Past Due		Total		Current		30 - 59 Days Past Due		60 - 89 Days Past Due		90 Days or More Past Due		Total
Non-covered loans:
1-4 single family residential	$	4,440,061	$	14,736	$	1,838	$	6,909	$	4,463,544	$	4,121,624	$	15,613	$	4,941	$	3,701	$	4,145,879
Government insured residential	31,348		8,342		8,871		218,168		266,729		23,455		1,611		1,153		1,855		28,074
Home equity loans and lines of credit	1,393		—		—		—		1,393		1,633		21		—		—		1,654
Other consumer loans	15,947		—		—		—		15,947		19,958		15		—		500		20,473
Multi-family	2,585,421		—		—		—		2,585,421		3,218,953		—		—		—		3,218,953
Non-owner occupied commercial real estate	4,682,443		3,621		1,374		1,442		4,688,880		4,464,967		7,549		—		2,285		4,474,801
Construction and land	224,828		916		—		1,096		226,840		309,309		—		—		1,175		310,484
Owner occupied commercial real estate	2,106,104		2,826		1,087		9,863		2,119,880		2,004,397		1,292		499		6,554		2,012,742
Commercial and industrial
Taxi medallion loans	155		—		—		620		775		88,394		6,048		3,333		8,292		106,067
Other commercial and industrial	4,772,823		6,732		926		8,944		4,789,425		4,025,784		4,291		291		1,394		4,031,760
Commercial lending subsidiaries
Pinnacle	1,462,655		—		—		—		1,462,655		1,524,622		—		—		—		1,524,622
Bridge	1,152,312		603		—		1,228		1,154,143		1,037,025		852		—		—		1,037,877
	$	21,475,490	$	37,776	$	14,096	$	248,270	$	21,775,632	$	20,840,121	$	37,292	$	10,217	$	25,756	$	20,913,386
Covered loans:
Non-ACI loans:
1-4 single family residential	$	11,153	$	—	$	—	$	—	$	11,153	$	21,106	$	1,603	$	—	$	1,341	$	24,050
ACI loans:
1-4 single family residential	$	189,557	$	334	$	288	$	44	$	190,223	$	448,125	$	10,388	$	2,719	$	17,836	$	479,068

Schedule of Loans Categorized

oans consisted of the following (dollars in thousands):



	2018
				Covered Loans								Percent of Total
	Non-Covered Loans			ACI		Non-ACI			Total			Percent of Total
Residential and other consumer:
1-4 single family residential	$	4,404,047		$	190,223	$	12,558		$	4,606,828		21.0	%
Government insured residential	265,701			—		—			265,701			1.2	%
Home equity loans and lines of credit	1,393			—		—			1,393			—	%
Other consumer loans	15,976			—		—			15,976			0.1	%
	4,687,117			190,223		12,558			4,889,898			22.3	%
Commercial:
Multi-family	2,583,331			—		—			2,583,331			11.8	%
Non-owner occupied commercial real estate	4,700,188			—		—			4,700,188			21.4	%
Construction and land	227,134			—		—			227,134			1.0	%
Owner occupied commercial real estate	2,122,381			—		—			2,122,381			9.7	%
Commercial and industrial	4,801,226			—		—			4,801,226			21.9	%
Commercial lending subsidiaries	2,608,834			—		—			2,608,834			11.9	%
	17,043,094			—		—			17,043,094			77.7	%
Total loans	21,730,211			190,223		12,558			21,932,992			100.0	%
Premiums, discounts and deferred fees and costs, net	45,421			—		(1,405		)	44,016
Loans including premiums, discounts and deferred fees and costs	21,775,632			190,223		11,153			21,977,008
Allowance for loan and lease losses	(109,901		)	—		(30		)	(109,931		)
Loans, net	$	21,665,731		$	190,223	$	11,123		$	21,867,077



	2017
				Covered Loans								Percent of Total
	Non-Covered Loans			ACI		Non-ACI			Total			Percent of Total
Residential and other consumer:
1-4 single family residential	$	4,089,994		$	479,068	$	27,198		$	4,596,260		21.5	%
Government insured residential	26,820			—		—			26,820			0.1	%
Home equity loans and lines of credit	1,654			—		—			1,654			—	%
Other consumer loans	20,512			—		—			20,512			0.1	%
	4,138,980			479,068		27,198			4,645,246			21.7	%
Commercial:
Multi-family	3,215,697			—		—			3,215,697			15.0	%
Non-owner occupied commercial real estate	4,485,276			—		—			4,485,276			21.0	%
Construction and land	310,999			—		—			310,999			1.5	%
Owner occupied commercial real estate	2,014,908			—		—			2,014,908			9.4	%
Commercial and industrial	4,145,785			—		—			4,145,785			19.4	%
Commercial lending subsidiaries	2,553,576			—		—			2,553,576			12.0	%
	16,726,241			—		—			16,726,241			78.3	%
Total loans	20,865,221			479,068		27,198			21,371,487			100.0	%
Premiums, discounts and deferred fees and costs, net	48,165			—		(3,148		)	45,017
Loans including premiums, discounts and deferred fees and costs	20,913,386			479,068		24,050			21,416,504
Allowance for loan and lease losses	(144,537		)	—		(258		)	(144,795		)
Loans, net	$	20,768,849		$	479,068	$	23,792		$	21,271,709

Covered Loan Sales - Residential [Table Text Block]

Covered loans



	2018		2017			2016
UPB of loans sold	$	539,853	$	203,970		$	241,348

Cash proceeds, net of transaction costs	$	488,972	$	169,828		$	171,367
Recorded investment in loans sold	483,240		152,422			185,837
Gain (loss) on sale of covered loans, net	$	5,732	$	17,406		$	(14,470	)

Gain (loss) on FDIC indemnification, net	$	3,388	$	(1,523	)	$	11,615

Accretable Yield Rollfoward [Table Text Block]



Balance at December 31, 2015	$	902,565
Reclassifications from non-accretable difference	76,751
Accretion	(303,931		)
Balance at December 31, 2016	675,385
Reclassifications from non-accretable difference, net	81,501
Accretion	(301,827		)
Balance at December 31, 2017	455,059
Reclassifications from non-accretable difference, net	128,499
Accretion	(369,915		)
Other changes, net ⁽¹⁾	78,204
Balance at December 31, 2018	$	291,847


(1)	Represents changes in cash flows expected to be collected due to the impact of changes in prepayment assumptions.

Impaired Financing Receivables

The table below presents information about loans or ACI pools identified as impaired as of December 31, 2018 and 2017 (in thousands):



	2018						2017
	Recorded Investment		UPB		Related Specific Allowance		Recorded Investment		UPB		Related Specific Allowance
Non-covered loans:
With no specific allowance recorded:
1-4 single family residential ⁽¹⁾	$	5,724	$	5,605	$	—	$	120	$	122	$	—
Multi-family	25,560		25,592		—		—		—		—
Non-owner occupied commercial real estate	12,293		12,209		—		10,922		10,838		—
Construction and land	9,923		9,925		—		1,175		1,175		—
Owner occupied commercial real estate	9,007		9,024		—		22,002		22,025		—
Commercial and industrial
Taxi medallion loans	775		775		—		13,560		13,559		—
Other commercial and industrial	12,739		12,744		—		345		374		—
Commercial lending subsidiaries	3,152		3,149		—		—		—		—
With a specific allowance recorded:
1-4 single family residential ⁽¹⁾	1,966		1,941		134		1,114		1,090		63
Multi-family	—		—		—		23,173		23,175		1,732
Owner occupied commercial real estate	3,316		3,322		844		3,075		3,079		2,960
Non-owner occupied commercial real estate	1,666		1,667		731		—		—		—
Commercial and industrial
Taxi medallion loans	—		—		—		92,507		92,508		12,214
Other commercial and industrial	10,939		10,946		3,831		3,626		3,624		1,540
Commercial lending subsidiaries	19,471		19,385		6,737		3,321		3,296		330
Total:
Residential and other consumer	$	7,690	$	7,546	$	134	$	1,234	$	1,212	$	63
Commercial	108,841		108,738		12,143		173,706		173,653		18,776
	$	116,531	$	116,284	$	12,277	$	174,940	$	174,865	$	18,839
Covered loans:
Non-ACI loans:
With no specific allowance recorded:
1-4 single family residential	$	—	$	—	$	—	$	1,061	$	1,203	$	—
With a specific allowance recorded:
1-4 single family residential	—		—		—		1,160		1,314		118
	$	—	$	—	$	—	$	2,221	$	2,517	$	118


(1)	Includes government insured residential loans at December 31, 2018 and 2017.

Interest income recognized on impaired loans and pools was insignificant for the year ended December 31, 2018 and approximately $9.6 million for the year ended December 31, 2017.

The following table presents the average recorded investment in impaired loans for the years ended December 31, 2018, 2017 and 2016 (in thousands):



	2018				2017				2016
	Non-Covered Loans		Covered Non-ACI Loans		Non-Covered Loans		Covered Non-ACI Loans		Non-Covered Loans		Covered Non-ACI Loans
Residential and other consumer:
1-4 single family residential	$	4,910	$	1,743	$	868	$	2,345	$	301	$	3,067
Home equity loans and lines of credit	—		—		—		8,403		—		9,225
	4,910		$	1,743	868		$	10,748	301		$	12,292
Commercial:
Multi-family	25,679				4,259				—
Non-owner occupied commercial real estate	14,106				5,537				710
Construction and land	6,551				2,789				797
Owner occupied commercial real estate	16,207				19,882				14,645
Commercial and industrial
Taxi medallion loans	79,786				108,977				45,012
Other commercial and industrial	17,602				38,275				40,443
Commercial lending subsidiaries	9,757				22,865				15,052
	169,688				202,584				116,659
	$	174,598			$	203,452			$	116,960

Schedule of Recorded Investment in Loans, Other than ACI Loans, on Non-Accrual Status

The following table presents the recorded investment in loans on non-accrual status as of December 31, 2018 and 2017 (in thousands):



	2018				2017
	Non-Covered Loans		Covered Non-ACI Loans		Non-Covered Loans		Covered Non-ACI Loans
Residential and other consumer:
1-4 single family residential	$	6,316	$	—	$	9,705	$	1,341
Other consumer loans	288		—		821		—
	6,604		$	—	10,526		$	1,341
Commercial:
Multi-family	25,560				—
Non-owner occupied commercial real estate	16,050				12,716
Construction and land	9,923				1,175
Owner occupied commercial real estate	19,789				29,020
Commercial and industrial
Taxi medallion loans	775				106,067
Other commercial and industrial	27,809				7,049
Commercial lending subsidiaries	22,733				3,512
	122,639				159,539
	$	129,243			$	170,065

Financing Receivable Credit Quality Indicators

1-4 Single Family Residential credit exposure for non-covered loans, excluding government insured residential loans, based on original LTV and FICO score:



	2018
	FICO
LTV	720 or less		721 - 740		741 - 760		761 or greater		Total
60% or less	$	105,812	$	123,877	$	197,492	$	813,944	$	1,241,125
60% - 70%	120,982		109,207		170,531		597,659		998,379
70% - 80%	156,519		203,121		374,311		1,264,491		1,998,442
More than 80%	17,352		35,036		36,723		136,487		225,598
	$	400,665	$	471,241	$	779,057	$	2,812,581	$	4,463,544



	2017
	FICO
LTV	720 or less		721 - 740		741 - 760		761 or greater		Total
60% or less	$	91,965	$	117,318	$	185,096	$	815,792	$	1,210,171
60% - 70%	100,866		103,387		147,541		590,493		942,287
70% - 80%	149,209		183,064		324,884		1,139,902		1,797,059
More than 80%	16,116		30,408		28,149		121,689		196,362
	$	358,156	$	434,177	$	685,670	$	2,667,876	$	4,145,879

Commercial credit exposure, based on internal risk rating:



	2018
									Commercial and Industrial				Commercial Lending Subsidiaries
	Multi-Family		Non-Owner Occupied Commercial Real Estate		Construction and Land		Owner Occupied Commercial Real Estate		Taxi Medallion Loans		Other Commercial and Industrial		Pinnacle		Bridge		Total
Pass	$	2,547,835	$	4,611,029	$	216,917	$	2,077,611	$	—	$	4,706,666	$	1,462,655	$	1,105,821	$	16,728,534
Special mention	2,932		16,516		—		13,368		—		38,097		—		10,157		81,070
Substandard	34,654		61,335		9,923		28,901		775		42,916		—		31,522		210,026
Doubtful	—		—		—		—		—		1,746		—		6,643		8,389
	$	2,585,421	$	4,688,880	$	226,840	$	2,119,880	$	775	$	4,789,425	$	1,462,655	$	1,154,143	$	17,028,019



	2017
									Commercial and Industrial				Commercial Lending Subsidiaries
	Multi-Family		Non-Owner Occupied Commercial Real Estate		Construction and Land		Owner Occupied Commercial Real Estate		Taxi Medallion Loans		Other Commercial and Industrial		Pinnacle		Bridge		Total
Pass	$	3,124,819	$	4,360,827	$	305,043	$	1,954,464	$	—	$	3,965,241	$	1,524,622	$	954,376	$	16,189,392
Special mention	34,837		33,094		—		22,161		—		37,591		—		55,551		183,234
Substandard	59,297		80,880		5,441		33,145		104,682		27,010		—		27,950		338,405
Doubtful	—		—		—		2,972		1,385		1,918		—		—		6,275
	$	3,218,953	$	4,474,801	$	310,484	$	2,012,742	$	106,067	$	4,031,760	$	1,524,622	$	1,037,877	$	16,717,306

Troubled Debt Restructurings on Financing Receivables [Table Text Block]



	2018
	Loans Modified in TDRs During the Period			TDRs Experiencing Payment Defaults During the Period
	Number of TDRs	Recorded Investment		Number of TDRs	Recorded Investment
Non-covered loans:
1-4 single family residential⁽¹⁾	36	$	6,462	18	$	2,489
Non-owner occupied commercial real estate	3	5,932		1	2,949
Owner occupied commercial real estate	2	1,076		—	—
Commercial and industrial	6	6,646		2	217
	47	$	20,116	21	$	5,655



	2017
	Loans Modified in TDRs During the Period			TDRs Experiencing Payment Defaults During the Period
	Number of TDRs	Recorded Investment		Number of TDRs	Recorded Investment
Non-covered loans:
1-4 single family residential	7	$	676	5	$	595
Multi-family	2	23,173		—	—
Owner occupied commercial real estate	3	4,685		—	—
Commercial and industrial
Taxi medallion loans	110	48,526		8	2,725
Other commercial and industrial	2	1,378		—	—
	124	$	78,438	13	$	3,320



	2016
	Loans Modified in TDRs During the Period			TDRs Experiencing Payment Defaults During the Period
	Number of TDRs	Recorded Investment		Number of TDRs	Recorded Investment
Non-covered loans:
1-4 single family residential	2	$	326	—	$	—
Owner occupied commercial real estate	3	5,117		1	491
Commercial and industrial
Taxi medallion loans	74	64,854		15	8,657
Other commercial and industrial	8	23,247		2	1,482
Commercial lending subsidiaries	6	6,735		1	2,500
	93	$	100,279	19	$	13,130
Covered loans:
Non-ACI loans:
Home equity loans and lines of credit	17	$	2,016	1	$	370

ACI loans:
Owner occupied commercial real estate	1	$	825	—	$	—


(1)	Includes government insured residential loans modified during the year ended December 31, 2018.

FDIC Indemnification Asset (Tables)

12 Months Ended

Dec. 31, 2018

FDIC Indemnification Asset [Abstract]

Summary of the Gains and Losses Associated with Covered Assets



	2018
	Transaction Income (Loss)			Net Loss on FDIC Indemnification			Net Impact on Pre-tax Earnings
Provision for losses on covered loans	$	(752	)	$	523		$	(229	)
Income from resolution of covered assets, net	11,551			(9,332		)	2,219
Gain on sale of covered loans	5,732			3,388			9,120
Loss on covered OREO	(1,620		)	1,222			(398		)
	$	14,911		$	(4,199	)	$	10,712



	2017
	Transaction Income (Loss)			Net Loss on FDIC Indemnification			Net Impact on Pre-tax Earnings
Provision for losses on covered loans	$	(1,358	)	$	1,039		$	(319	)
Income from resolution of covered assets, net	27,450			(21,912		)	5,538
Gain on sale of covered loans	17,406			(1,514		)	15,892
Loss on covered OREO	(203		)	167			(36		)
	$	43,295		$	(22,220	)	$	21,075



	2016
	Transaction Income (Loss)			Net Loss on FDIC Indemnification			Net Impact on Pre-tax Earnings
Recovery of losses on covered loans	$	1,681		$	(1,472	)	$	209
Income from resolution of covered assets, net	36,155			(28,946		)	7,209
Loss on sale of covered loans	(14,470		)	11,615			(2,855		)
Loss on covered OREO	(1,301		)	1,044			(257		)
	$	22,065		$	(17,759	)	$	4,306

Changes in the FDIC Indemnification Asset

Changes in the FDIC indemnification asset for the years ended December 31, 2018, 2017 and 2016, were as follows (in thousands):



Balance at December 31, 2015	$	739,843
Amortization	(160,091		)
Reduction for claims filed	(46,083		)
Net loss on FDIC indemnification	(17,759		)
Balance at December 31, 2016	515,910
Amortization	(176,466		)
Reduction for claims filed	(21,589		)
Net loss on FDIC indemnification	(22,220		)
Balance at December 31, 2017	295,635
Amortization	(261,763		)
Reduction for claims	(29,673		)
Net loss on FDIC indemnification	(4,199		)
Balance at December 31, 2018	$	—

Equipment Under Operating Lease (Tables)

12 Months Ended

Dec. 31, 2018

Leases [Abstract]

Schedule of Property Subject to or Available for Operating Lease [Table Text Block]



	2018			2017
Equipment under operating lease	$	802,302		$	674,434
Less: accumulated depreciation	(99,948		)	(74,932		)
Equipment under operating lease, net	$	702,354		$	599,502

Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]

At December 31, 2018, scheduled minimum rental payments under operating leases were as follows (in thousands):



Years Ending December 31:
2019	$	65,201
2020	59,512
2021	49,987
2022	43,482
2023	35,342
Thereafter through 2033	100,170
	$	353,694

Premises and Equipment and Lease Commitments (Tables)

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment, Type [Abstract]

Property, Plant and Equipment Disclosure [Text Block]

Premises and Equipment, Lease Commitments, Software and CCA

Premises and equipment are included in other assets in the accompanying consolidated balance sheets and are summarized as follows as of December 31, 2018 and 2017 (in thousands):



	2018			2017
Buildings and improvements	$	18,793		$	18,793
Leasehold improvements	69,651			70,298
Furniture, fixtures and equipment	36,581			35,675
Computer equipment	22,218			21,078
Software and software licensing rights	47,653			42,908
Aircraft and automobiles	11,614			11,744
Capitalized implementation costs of CCA	879			—
	207,389			200,496
Less: accumulated depreciation	(135,743		)	(121,477		)
Premises and equipment, net	$	71,646		$	79,019

Buildings and improvements includes $11 million related to property under capital lease at both December 31, 2018 and 2017.

Depreciation and amortization expense related to premises and equipment, including amortization of assets recorded under capital leases, was $18.5 million, $19.4 million and $21.3 million for the years ended December 31, 2018, 2017 and 2016, respectively.

The Company leases branch and office facilities under operating leases, most of which contain renewal options under various terms. Total rent expense under operating leases for the years ended December 31, 2018, 2017 and 2016 was $26.0 million, $27.5 million, and $27.6 million, respectively.

As of December 31, 2018, future minimum rentals under non-cancelable operating leases with initial or remaining terms in excess of one year were as follows (in thousands):



Years ending December 31:
2019	$	21,207
2020	17,629
2021	15,858
2022	12,114
2023	10,311
Thereafter through 2034	42,984
	$	120,103

Property, Plant and Equipment [Table Text Block]

Premises and Equipment, Lease Commitments, Software and CCA

Premises and equipment are included in other assets in the accompanying consolidated balance sheets and are summarized as follows as of December 31, 2018 and 2017 (in thousands):



	2018			2017
Buildings and improvements	$	18,793		$	18,793
Leasehold improvements	69,651			70,298
Furniture, fixtures and equipment	36,581			35,675
Computer equipment	22,218			21,078
Software and software licensing rights	47,653			42,908
Aircraft and automobiles	11,614			11,744
Capitalized implementation costs of CCA	879			—
	207,389			200,496
Less: accumulated depreciation	(135,743		)	(121,477		)
Premises and equipment, net	$	71,646		$	79,019

Buildings and improvements includes $11 million related to property under capital lease at both December 31, 2018 and 2017.

Premises and Equipment and Lease Commitments

As of December 31, 2018, future minimum rentals under non-cancelable operating leases with initial or remaining terms in excess of one year were as follows (in thousands):



Years ending December 31:
2019	$	21,207
2020	17,629
2021	15,858
2022	12,114
2023	10,311
Thereafter through 2034	42,984
	$	120,103

Deposits Deposits (Tables)

12 Months Ended

Dec. 31, 2018

Banking and Thrift [Abstract]

Summary of Average Balances and Weighted Average Rates Paid on Deposits

The following table presents average balances and weighted average rates paid on deposits for the years ended December 31, 2018, 2017 and 2016 (dollars in thousands):



	2018				2017				2016
	Average Balance		Average Rate Paid		Average Balance		Average Rate Paid		Average Balance		Average Rate Paid
Demand deposits:
Non-interest bearing	$	3,389,191	—	%	$	3,069,565	—	%	$	2,968,192	—	%
Interest bearing	1,627,828		1.13	%	1,586,390		0.81	%	1,382,717		0.60	%
Money market	10,350,772		1.41	%	9,364,498		0.85	%	7,946,447		0.64	%
Savings	284,198		0.26	%	365,603		0.21	%	415,205		0.23	%
Time	6,617,006		1.81	%	6,094,336		1.27	%	5,326,630		1.12	%
	$	22,268,995	1.28	%	$	20,480,392	0.83	%	$	18,039,191	0.66	%

Deposit Liabilities Disclosures [Text Block]

Deposits

The following table presents average balances and weighted average rates paid on deposits for the years ended December 31, 2018, 2017 and 2016 (dollars in thousands):



	2018				2017				2016
	Average Balance		Average Rate Paid		Average Balance		Average Rate Paid		Average Balance		Average Rate Paid
Demand deposits:
Non-interest bearing	$	3,389,191	—	%	$	3,069,565	—	%	$	2,968,192	—	%
Interest bearing	1,627,828		1.13	%	1,586,390		0.81	%	1,382,717		0.60	%
Money market	10,350,772		1.41	%	9,364,498		0.85	%	7,946,447		0.64	%
Savings	284,198		0.26	%	365,603		0.21	%	415,205		0.23	%
Time	6,617,006		1.81	%	6,094,336		1.27	%	5,326,630		1.12	%
	$	22,268,995	1.28	%	$	20,480,392	0.83	%	$	18,039,191	0.66	%

Time deposit accounts with balances of $100,000 or more totaled approximately $4.1 billion at both December 31, 2018 and 2017. Time deposit accounts with balances of $250,000 or more totaled $2.4 billion and $2.3 billion at December 31, 2018 and 2017, respectively.

The following table presents maturities of time deposits as of December 31, 2018 (in thousands):



Maturing in:
2019	$	5,119,279
2020	1,533,117
2021	94,973
2022	22,316
2023	50,073
	$	6,819,758

Included in deposits at December 31, 2018 are public funds deposits of $2.6 billion and brokered deposits of $2.5 billion. Investment securities available for sale with a carrying value of $1.3 billion were pledged as security for public funds deposits at December 31, 2018.

Interest expense on deposits for the years ended December 31, 2018, 2017 and 2016 was as follows (in thousands):



	2018		2017		2016
Interest bearing demand	$	18,391	$	12,873	$	8,343
Money market	145,585		79,645		50,802
Savings	739		752		972
Time	119,848		77,663		59,656
	$	284,563	$	170,933	$	119,773

Maturities of Time Deposits [Table Text Block]

The following table presents maturities of time deposits as of December 31, 2018 (in thousands):



Maturing in:
2019	$	5,119,279
2020	1,533,117
2021	94,973
2022	22,316
2023	50,073
	$	6,819,758

Schedule of Interest Expense on Deposits

Interest expense on deposits for the years ended December 31, 2018, 2017 and 2016 was as follows (in thousands):



	2018		2017		2016
Interest bearing demand	$	18,391	$	12,873	$	8,343
Money market	145,585		79,645		50,802
Savings	739		752		972
Time	119,848		77,663		59,656
	$	284,563	$	170,933	$	119,773

Federal Home Loan Bank Advances and Other Borrowings (Tables)

12 Months Ended

Dec. 31, 2018

FHLB Advances, Notes and Other Borrowings [Abstract]

Schedule of Federal Home Loan Bank, Advances, by Branch of FHLB Bank [Table Text Block]

The following table presents information about outstanding FHLB advances as of December 31, 2018 (dollars in thousands):



			Range of Interest Rates
	Amount		Minimum		Maximum		Weighted Average Rate
Maturing in:
2019—One month or less	$	2,325,000	2.24	%	2.53	%	2.41	%
2019—Over one month	1,821,000		1.46	%	2.76	%	2.58	%
2020	375,000		1.67	%	2.91	%	2.49	%
2021	275,000		2.73	%	3.02	%	2.89	%
Carrying value	$	4,796,000

Schedule of Debt [Table Text Block]

At December 31, 2018 and 2017 outstanding senior notes payable and other borrowings consisted of the following (dollars in thousands):



	2018			2017
Principal amount of 4.875% senior notes	$	400,000		$	400,000
Unamortized discount and debt issuance costs	(5,610		)	(6,275		)
	394,390			393,725
Capital lease obligations	8,359			9,105
	$	402,749		$	402,830

Federal Home Loan Bank Advances, Notes and Other Borrowings Notes payable and other borrowings table (Tables)

12 Months Ended

Dec. 31, 2018

Debt Disclosure [Abstract]

Schedule of Federal Home Loan Bank, Advances, by Branch of FHLB Bank [Table Text Block]

The following table presents information about outstanding FHLB advances as of December 31, 2018 (dollars in thousands):



			Range of Interest Rates
	Amount		Minimum		Maximum		Weighted Average Rate
Maturing in:
2019—One month or less	$	2,325,000	2.24	%	2.53	%	2.41	%
2019—Over one month	1,821,000		1.46	%	2.76	%	2.58	%
2020	375,000		1.67	%	2.91	%	2.49	%
2021	275,000		2.73	%	3.02	%	2.89	%
Carrying value	$	4,796,000

Schedule of Debt [Table Text Block]

At December 31, 2018 and 2017 outstanding senior notes payable and other borrowings consisted of the following (dollars in thousands):



	2018			2017
Principal amount of 4.875% senior notes	$	400,000		$	400,000
Unamortized discount and debt issuance costs	(5,610		)	(6,275		)
	394,390			393,725
Capital lease obligations	8,359			9,105
	$	402,749		$	402,830

Derivatives and Hedging Activities (Tables)

12 Months Ended

Dec. 31, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Interest Rate Contract Derivative Financial Instruments and Related Hedged Items



	2018
		Weighted Average Pay Rate	Weighted Average Receive Rate	Weighted Average Remaining Life in Years
					Notional Amount		Balance Sheet Location	Fair Value
	Hedged Item				Notional Amount		Balance Sheet Location	Asset		Liability
Derivatives designated as cash flow hedges:
Pay-fixed interest rate swaps	Variability of interest cash flows on variable rate borrowings	2.38%	3-Month Libor	4.0	$	2,846,000	Other assets / Other liabilities	$	3,405	$	—
Derivatives not designated as hedges:
Pay-fixed interest rate swaps		4.10%	Indexed to 1-month Libor	6.0	1,048,196		Other assets / Other liabilities	14,883		(6,991		)
Pay-variable interest rate swaps		Indexed to 1-month Libor	4.10%	6.0	1,048,196		Other assets / Other liabilities	11,318		(16,874		)
Interest rate caps purchased, indexed to 1-month Libor			3.43%	1.2	98,407		Other assets	9		—
Interest rate caps sold, indexed to 1-month Libor		3.43%		1.2	98,407		Other liabilities	—		(9		)
					$	5,139,206		$	29,615	$	(23,874	)



	2017
		Weighted Average Pay Rate	Weighted Average Receive Rate	Weighted Average Remaining Life in Years
					Notional Amount		Balance Sheet Location	Fair Value
	Hedged Item				Notional Amount		Balance Sheet Location	Asset		Liability
Derivatives designated as cash flow hedges:
Pay-fixed interest rate swaps	Variability of interest cash flows on variable rate borrowings	1.77%	3-Month Libor	4.3	$	2,046,000	Other assets / Other liabilities	$	2,350	$	—
Derivatives not designated as hedges:
Pay-fixed interest rate swaps		3.87%	Indexed to 1-month Libor	6.4	1,028,041		Other assets / Other liabilities	10,856		(13,173		)
Pay-variable interest rate swaps		Indexed to 1-month Libor	3.87%	6.4	1,028,041		Other assets / Other liabilities	14,410		(12,189		)
Interest rate caps purchased, indexed to 1-month Libor			2.81%	1.3	145,354		Other assets	11		—
Interest rate caps sold, indexed to 1-month Libor		2.81%		1.3	145,354		Other liabilities	—		(11		)
					$	4,392,790		$	27,627	$	(25,373	)

Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]



	2018		2017			2016			Location of Gain (Loss) Reclassified from AOCI into Income
Interest rate contracts	$	1,999	$	(9,621	)	$	(16,161	)	Interest expense on borrowings

Schedule of Interest Rate Swaps Subject to Master Netting Agreements



	2018
				Gross Amounts Offset in Balance Sheet		Net Amounts Presented in Balance Sheet			Gross Amounts Not Offset in Balance Sheet
	Gross Amounts Recognized			Gross Amounts Offset in Balance Sheet		Net Amounts Presented in Balance Sheet			Derivative Instruments			Collateral Pledged			Net Amount
Derivative assets	$	18,297		$	—	$	18,297		$	(5,264	)	$	(13,129	)	$	(96	)
Derivative liabilities	(6,991		)	—		(6,991		)	5,264			436			(1,291		)
	$	11,306		$	—	$	11,306		$	—		$	(12,693	)	$	(1,387	)



	2017
				Gross Amounts Offset in Balance Sheet		Net Amounts Presented in Balance Sheet			Gross Amounts Not Offset in Balance Sheet
	Gross Amounts Recognized			Gross Amounts Offset in Balance Sheet		Net Amounts Presented in Balance Sheet			Derivative Instruments			Collateral Pledged			Net Amount
Derivative assets	$	13,217		$	—	$	13,217		$	(7,996	)	$	(5,221	)	$	—
Derivative liabilities	(13,173		)	—		(13,173		)	7,996			4,962			(215		)
	$	44		$	—	$	44		$	—		$	(259	)	$	(215	)

Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2018

Equity [Abstract]

Schedule of Changes in AOCI

Changes in other comprehensive income are summarized as follows for the years ended December 31, 2018, 2017 and 2016 (in thousands):



	2018
	Before Tax			Tax Effect			Net of Tax
Unrealized gains on investment securities available for sale:
Net unrealized holding loss arising during the period	$	(77,607	)	$	20,566		$	(57,041	)
Amounts reclassified to gain on investment securities available for sale, net	(6,103		)	1,617			(4,486		)
Net change in unrealized gains on investment securities available for sale	(83,710		)	22,183			(61,527		)
Unrealized losses on derivative instruments:
Net unrealized holding gain arising during the period	5,416			(1,435		)	3,981
Amounts reclassified to interest expense on borrowings	(1,999		)	530			(1,469		)
Net change in unrealized losses on derivative instruments	3,417			(905		)	2,512
Other comprehensive loss	$	(80,293	)	$	21,278		$	(59,015	)



	2017
	Before Tax			Tax Effect			Net of Tax
Unrealized gains on investment securities available for sale:
Net unrealized holding gain arising during the period	$	49,131		$	(19,407	)	$	29,724
Amounts reclassified to gain on investment securities available for sale, net	(33,466		)	13,219			(20,247		)
Net change in unrealized gains on investment securities available for sale	15,665			(6,188		)	9,477
Unrealized losses on derivative instruments:
Net unrealized holding loss arising during the period	(2,577		)	1,018			(1,559		)
Amounts reclassified to interest expense on borrowings	9,621			(3,800		)	5,821
Net change in unrealized losses on derivative instruments	7,044			(2,782		)	4,262
Other comprehensive income	$	22,709		$	(8,970	)	$	13,739



	2016
	Before Tax			Tax Effect			Net of Tax
Unrealized gains on investment securities available for sale:
Net unrealized holding gain arising during the period	$	23,588		$	(9,317	)	$	14,271
Amounts reclassified to gain on investment securities available for sale, net	(14,461		)	5,712			(8,749		)
Net change in unrealized gains on investment securities available for sale	9,127			(3,605		)	5,522
Unrealized losses on derivative instruments:
Net unrealized holding gain arising during the period	6,225			(2,459		)	3,766
Amounts reclassified to interest expense on borrowings	16,161			(6,384		)	9,777
Net change in unrealized losses on derivative instruments	22,386			(8,843		)	13,543
Other comprehensive income	$	31,513		$	(12,448	)	$	19,065

Schedule of the Categories of AOCI and Changes Therein

The categories of AOCI and changes therein are presented below for the years ended December 31, 2018, 2017 and 2016 (in thousands):



	Unrealized Gain (Loss) on Investment Securities Available for Sale			Unrealized Gain (Loss) on Derivative Instruments			Total
Balance at December 31, 2015	$	41,535		$	(19,353	)	$	22,182
Other comprehensive income	5,522			13,543			19,065
Balance at December 31, 2016	$	47,057		$	(5,810	)	$	41,247
Other comprehensive income	9,477			4,262			13,739
Balance at December 31, 2017	$	56,534		$	(1,548	)	$	54,986
Cumulative effect of adoption of new accounting standards	9,187			(285		)	8,902
Other comprehensive loss	(61,527		)	2,512			(59,015		)
Balance at December 31, 2018	$	4,194		$	679		$	4,873

Equity Based Compensation (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]



	Outstanding and Exercisable Options
Range of Exercise Prices	Number of Options	Weighted Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value (in thousands)
$11.14	3,910	0.73	$	74
$15.94 - $19.97	29,145	1.59	357
$22.18 - $22.31	40,917	2.42	314
$27	888,908	2.08	2,613
$63.74	1,960	0.18	—
	964,840	2.07	3,358

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]

Compensation Expense Related to Equity Based Awards

The following table summarizes compensation cost related to equity based awards for the years ended December 31, 2018, 2017 and 2016 (in thousands):



	2018			2017			2016
Compensation cost of equity based awards:
Unvested and restricted share awards	$	19,415		$	18,087		$	16,885
Executive share-based awards	3,027			3,416			1,482
Incentive awards	798			1,289			—
Total compensation cost of equity based awards	23,240			22,792			18,367
Related tax benefits	(5,783		)	(8,576		)	(6,899		)
Compensation cost of equity based awards, net of tax	$	17,457		$	14,216		$	11,468

Schedule of Other Share-based Compensation, Activity [Table Text Block]

A summary of activity related to executive share-based awards for the years ended December 31, 2018, 2017 and 2016 follows:



	RSU		PSU
Unvested executive share-based awards outstanding, December 31, 2015	—		—
Granted	97,852		57,873
Vested	(19,291	)	—
Unvested executive share-based awards outstanding, December 31, 2016	78,561		57,873
Granted	47,848		47,848
Vested	(35,238	)	—
Unvested executive share-based awards outstanding, December 31, 2017	91,171		105,721
Granted	52,026		52,026
Vested	(52,585	)	(57,873	)
Unvested executive share-based awards outstanding, December 31, 2018	90,612		99,874

Share-based Compensation, Stock Options, Activity [Table Text Block]

Note 13 Equity Based and Other Compensation Plans

Description of Equity Based Compensation Plans

Compensation Expense Related to Equity Based Awards

The following table summarizes compensation cost related to equity based awards for the years ended December 31, 2018, 2017 and 2016 (in thousands):



	2018			2017			2016
Compensation cost of equity based awards:
Unvested and restricted share awards	$	19,415		$	18,087		$	16,885
Executive share-based awards	3,027			3,416			1,482
Incentive awards	798			1,289			—
Total compensation cost of equity based awards	23,240			22,792			18,367
Related tax benefits	(5,783		)	(8,576		)	(6,899		)
Compensation cost of equity based awards, net of tax	$	17,457		$	14,216		$	11,468

Share Awards

Unvested share awards

A summary of activity related to unvested share awards follows for the years ended December 31, 2018, 2017 and 2016 follows:



	Number of Share Awards		Weighted Average Grant Date Fair Value
Unvested share awards outstanding, December 31, 2015	1,040,385		$	31.86
Granted	651,760		31.00
Vested	(428,167	)	31.79
Canceled or forfeited	(143,278	)	31.31
Unvested share awards outstanding, December 31, 2016	1,120,700		31.46
Granted	621,806		40.24
Vested	(553,007	)	31.67
Canceled or forfeited	(81,022	)	34.51
Unvested share awards outstanding, December 31, 2017	1,108,477		36.06
Granted	683,137		40.06
Vested	(532,662	)	34.64
Canceled or forfeited	(72,714	)	38.43
Unvested share awards outstanding, December 31, 2018	1,186,238		$	38.86



	2018		2017		2016
Range of the closing price on date of grant	$33.44 - $42.8		$33.21 - $40.84		$29.78 - $33.76
Aggregate grant date fair value of shares vesting	$	18,451	$	17,514	$	13,613

The total unrecognized compensation cost of $26.5 million for all unvested share awards outstanding at December 31, 2018 will be recognized over a weighted average remaining period of 1.70 years.

Executive share-based awards

A summary of activity related to executive share-based awards for the years ended December 31, 2018, 2017 and 2016 follows:



	RSU		PSU
Unvested executive share-based awards outstanding, December 31, 2015	—		—
Granted	97,852		57,873
Vested	(19,291	)	—
Unvested executive share-based awards outstanding, December 31, 2016	78,561		57,873
Granted	47,848		47,848
Vested	(35,238	)	—
Unvested executive share-based awards outstanding, December 31, 2017	91,171		105,721
Granted	52,026		52,026
Vested	(52,585	)	(57,873	)
Unvested executive share-based awards outstanding, December 31, 2018	90,612		99,874

Incentive awards

Option Awards

A summary of activity related to stock option awards for the years ended December 31, 2018, 2017 and 2016 follows:



	Number of Option Awards		Weighted Average Exercise Price
Option awards outstanding, December 31, 2015	3,651,152		$	26.62
Exercised	(47,979	)	16.50
Canceled or forfeited	(1,097	)	63.74
Option awards outstanding, December 31, 2016	3,602,076		26.74
Exercised	(2,331,388	)	26.63
Option awards outstanding, December 31, 2017	1,270,688		26.93
Exercised	(291,689	)	26.49
Canceled or forfeited	(14,159	)	11.14
Option awards outstanding and exercisable, December 31, 2018	964,840		$	27.30

Schedule of Nonvested Share Activity [Table Text Block]

A summary of activity related to unvested share awards follows for the years ended December 31, 2018, 2017 and 2016 follows:



	Number of Share Awards		Weighted Average Grant Date Fair Value
Unvested share awards outstanding, December 31, 2015	1,040,385		$	31.86
Granted	651,760		31.00
Vested	(428,167	)	31.79
Canceled or forfeited	(143,278	)	31.31
Unvested share awards outstanding, December 31, 2016	1,120,700		31.46
Granted	621,806		40.24
Vested	(553,007	)	31.67
Canceled or forfeited	(81,022	)	34.51
Unvested share awards outstanding, December 31, 2017	1,108,477		36.06
Granted	683,137		40.06
Vested	(532,662	)	34.64
Canceled or forfeited	(72,714	)	38.43
Unvested share awards outstanding, December 31, 2018	1,186,238		$	38.86



	2018		2017		2016
Range of the closing price on date of grant	$33.44 - $42.8		$33.21 - $40.84		$29.78 - $33.76
Aggregate grant date fair value of shares vesting	$	18,451	$	17,514	$	13,613

The total unrecognized compensation cost of $26.5 million for all unvested share awards outstanding at December 31, 2018 will be recognized over a weighted average remaining period of 1.70 years.

Regulatory Requirements and Restrictions (Tables)

12 Months Ended

Dec. 31, 2018

Banking and Thrift [Abstract]

Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]

The following tables provide information regarding regulatory capital for the Company and the Bank as of December 31, 2018 and 2017 (dollars in thousands):



	2018
	Actual				Required to be Considered Well Capitalized				Required to be Considered Adequately Capitalized				Required to be Considered Adequately Capitalized Under Capital Conservation Buffer
	Amount		Ratio		Amount		Ratio		Amount		Ratio		Amount		Ratio
BankUnited, Inc.:
Tier 1 leverage	$	2,839,302	8.99	%	N/A ⁽¹⁾		N/A⁽¹⁾		$	1,263,725	4.00	%	N/A		N/A
CET1 risk-based capital	$	2,839,302	12.57	%	$	1,467,693	6.50	%	$	1,016,095	4.50	%	$	1,580,593	7.00	%
Tier 1 risk-based capital	$	2,839,302	12.57	%	$	1,806,392	8.00	%	$	1,354,794	6.00	%	$	1,919,291	8.50	%
Total risk based capital	$	2,952,464	13.08	%	$	2,257,990	10.00	%	$	1,806,392	8.00	%	$	2,370,889	10.50	%
BankUnited:
Tier 1 leverage	$	3,026,106	9.60	%	$	1,575,712	5.00	%	$	1,260,569	4.00	%	N/A		N/A
CET1 risk-based capital	$	3,026,106	13.45	%	$	1,462,054	6.50	%	$	1,012,191	4.50	%	$	1,574,519	7.00	%
Tier 1 risk-based capital	$	3,026,106	13.45	%	$	1,799,451	8.00	%	$	1,349,588	6.00	%	$	1,911,917	8.50	%
Total risk based capital	$	3,139,268	13.96	%	$	2,249,314	10.00	%	$	1,799,451	8.00	%	$	2,361,779	10.50	%



	2017
	Actual				Required to be Considered Well Capitalized				Required to be Considered Adequately Capitalized
	Amount		Ratio		Amount		Ratio		Amount		Ratio
BankUnited, Inc.:
Tier 1 leverage	$	2,892,069	9.72	%	N/A ⁽¹⁾		N/A ⁽¹⁾		$	1,189,944	4.00	%
CET1 risk-based capital	$	2,892,069	13.11	%	$	1,434,193	6.50	%	$	992,903	4.50	%
Tier 1 risk-based capital	$	2,892,069	13.11	%	$	1,765,161	8.00	%	$	1,323,871	6.00	%
Total risk based capital	$	3,041,004	13.78	%	$	2,206,451	10.00	%	$	1,765,161	8.00	%
BankUnited:
Tier 1 leverage	$	3,107,920	10.47	%	$	1,483,796	5.00	%	$	1,187,037	4.00	%
CET1 risk-based capital	$	3,107,920	14.13	%	$	1,429,999	6.50	%	$	989,999	4.50	%
Tier 1 risk-based capital	$	3,107,920	14.13	%	$	1,759,999	8.00	%	$	1,319,999	6.00	%
Total risk based capital	$	3,255,221	14.80	%	$	2,199,999	10.00	%	$	1,759,999	8.00	%

(1) There is no Tier 1 leverage ratio component in the definition of a well-capitalized bank holding company.

Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis

The following tables present assets and liabilities measured at fair value on a recurring basis at the dates indicated (in thousands):



	2018
	Level 1		Level 2		Level 3		Total
Investment securities available for sale:
U.S. Treasury securities	$	39,873	$	—	$	—	$	39,873
U.S. Government agency and sponsored enterprise residential MBS	—		1,897,474		—		1,897,474
U.S. Government agency and sponsored enterprise commercial MBS	—		374,787		—		374,787
Private label residential MBS and CMOs	—		1,499,514		34,684		1,534,198
Private label commercial MBS	—		1,485,716		—		1,485,716
Single family rental real estate-backed securities	—		402,458		—		402,458
Collateralized loan obligations	—		1,235,198		—		1,235,198
Non-mortgage asset-backed securities	—		204,067		—		204,067
State and municipal obligations	—		398,429		—		398,429
SBA securities	—		519,313		—		519,313
Other debt securities	—		—		4,846		4,846
Marketable equity securities	60,519		—		—		60,519
Servicing rights	—		—		9,525		9,525
Derivative assets	—		29,615		—		29,615
Total assets at fair value	$	100,392	$	8,046,571	$	49,055	$	8,196,018
Derivative liabilities	$	—	$	23,874	$	—	$	23,874
Total liabilities at fair value	$	—	$	23,874	$	—	$	23,874



	2017
	Level 1		Level 2		Level 3		Total
Investment securities available for sale:
U.S. Treasury securities	$	24,953	$	—	$	—	$	24,953
U.S. Government agency and sponsored enterprise residential MBS	—		2,058,027		—		2,058,027
U.S. Government agency and sponsored enterprise commercial MBS	—		234,508		—		234,508
Private label residential MBS and CMOs	—		576,033		52,214		628,247
Private label commercial MBS	—		1,046,415		—		1,046,415
Single family rental real estate-backed securities	—		562,706		—		562,706
Collateralized loan obligations	—		723,681		—		723,681
Non-mortgage asset-backed securities	—		121,747		—		121,747
Marketable equity securities	63,543		—		—		63,543
State and municipal obligations	—		657,203		—		657,203
SBA securities	—		550,682		—		550,682
Other debt securities	—		3,791		5,329		9,120
Servicing rights	—		—		30,737		30,737
Derivative assets	—		27,627		—		27,627
Total assets at fair value	$	88,496	$	6,562,420	$	88,280	$	6,739,196
Derivative liabilities	$	—	$	25,373	$	—	$	25,373
Total liabilities at fair value	$	—	$	25,373	$	—	$	25,373

Reconciliation of the Changes in the Fair Value of Assets and Liabilities Measured on a Recurring Basis, Unobservable Input



	2018
	Private Label Residential MBS			Other Debt Securities			Servicing Rights
Balance at beginning of period	$	52,214		$	5,329		$	30,737
Gains (losses) for the period included in:
Net income	1,319			—			761
Other comprehensive income	(5,193		)	(289		)	—
Discount accretion	2,916			809			—
Purchases or additions	—			—			12,600
Sales	(5,120		)	—			(34,573		)
Settlements	(11,452		)	(1,003		)	—
Balance at end of period	$	34,684		$	4,846		$	9,525
Change in unrealized gains or losses included in OCI for assets held at the end of the reporting period	$	(3,724	)	$	(289	)



	2017
	Private Label Residential MBS			Other Debt Securities			Servicing Rights
Balance at beginning of period	$	120,610		$	4,572		$	27,159
Gains (losses) for the period included in:
Net income	25,547			—			(5,821		)
Other comprehensive income	(27,569		)	766			—
Discount accretion	6,181			280			—
Purchases or additions	—			—			9,399
Sales	(45,524		)	—			—
Settlements	(27,031		)	(289		)	—
Balance at end of period	$	52,214		$	5,329		$	30,737
Change in unrealized gains or losses included in OCI for assets held at the end of the reporting period	$	(3,345	)	$	766



	2016
	Private Label Residential MBS			Other Debt Securities			Servicing Rights
Balance at beginning of period	$	140,883		$	4,532		$	20,017
Gains (losses) for the period included in:
Net income	—			—			(6,023		)
Other comprehensive income	(2,229		)	(9		)	—
Discount accretion	5,947			116			—
Purchases or additions	—			—			13,165
Settlements	(23,991		)	(67		)	—
Balance at end of period	$	120,610		$	4,572		$	27,159
Change in unrealized gains or losses included in OCI for assets held at the end of the reporting period	$	(2,229	)	$	(9	)

Valuation Techniques and Unobservable Inputs Used in the Valuation of Financial Instruments Falling Within Level 3 of the Fair Value Hierarchy

vides information about the valuation techniques and unobservable inputs used in the valuation of private label residential MBS and CMOs falling within level 3 of the fair value hierarchy as of December 31, 2018 (dollars in thousands):



	Fair Value at		Valuation Technique	Unobservable Input	Range (Weighted Average)
	December 31, 2018		Valuation Technique	Unobservable Input	Range (Weighted Average)
Investment grade	$	22,675	Discounted cash flow	Voluntary prepayment rate	4.30% - 25.50% (12.28%)
				Probability of default	0.00% - 5.85% (1.03%)
				Loss severity	15.00% - 100.00% (18.84%)
				Discount rate	2.35% - 7.71% (2.95%)

Non-investment grade	$	12,009	Discounted cash flow	Voluntary prepayment rate	1.20% - 25.00% (16.51%)
				Probability of default	0.00% - 5.85% (2.31%)
				Loss severity	15.00% - 76.60% (29.16%)
				Discount rate	1.06% - 9.95% (4.91%)

The following table provides information about the valuation techniques and significant unobservable inputs used in the valuation of servicing rights as of December 31, 2018 (dollars in thousands):



	Fair Value at		Valuation Technique	Unobservable Input	Range (Weighted Average)
	December 31, 2018		Valuation Technique	Unobservable Input	Range (Weighted Average)
Commercial servicing rights	$	9,525	Discounted cash flow	Prepayment rate	2.82% - 17.09% (12.34%)
				Discount rate	4.84% - 17.07% (13.33%)

Increases in prepayment

Schedule of Assets for Which Nonrecurring Changes in Fair Value have been Recorded

sent the carrying value of assets for which non-recurring changes in fair value have been recorded for the periods indicated (in thousands):



	2018
									Losses from Fair Value Changes
	Level 1		Level 2		Level 3		Total		Year Ended December 31, 2018
OREO and repossessed assets	$	—	$	1,085	$	486	$	1,571	$	(1,864	)
Impaired loans	$	—	$	775	$	35,397	$	36,172	$	(6,816	)



	2017
									Losses from Fair Value Changes
	Level 1		Level 2		Level 3		Total		Year Ended December 31, 2017
OREO and repossessed assets	$	—	$	—	$	5,790	$	5,790	$	(2,078	)
Impaired loans	$	—	$	—	$	93,051	$	93,051	$	(65,716	)



	2016
									Losses from Fair Value Changes
	Level 1		Level 2		Level 3		Total		Year Ended December 31, 2016
OREO and repossessed assets	$	—	$	—	$	12,466	$	12,466	$	(1,156	)
Impaired loans	$	—	$	—	$	78,121	$	78,121	$	(25,573	)
Equipment under operating lease	$	—	$	—	$	8,173	$	8,173	$	(4,100	)

The following table pre

Schedule of the Carrying Value and Fair Value of Financial Instruments

ents the carrying value and fair value of financial instruments and the level within the fair value hierarchy in which those measurements are classified at December 31, 2018 and 2017 (dollars in thousands):



		2018				2017
	Level	Carrying Value		Fair Value		Carrying Value		Fair Value
Assets:
Cash and cash equivalents	1	$	382,073	$	382,073	$	194,582	$	194,582
Investment securities	1/2/3	8,166,878		8,167,127		6,690,832		6,690,832
Non-marketable equity securities	2	267,052		267,052		265,989		265,989
Loans held for sale	2	36,992		39,931		34,097		37,847
Loans:
Covered	3	201,346		207,813		502,860		922,888
Non-covered	3	21,665,731		21,660,445		20,768,849		20,759,567
FDIC indemnification asset	3	—		—		295,635		148,356
Derivative assets	2	29,615		29,615		27,627		27,627
Liabilities:
Demand, savings and money market deposits	2	$	16,654,465	$	16,654,465	$	15,543,637	$	15,543,637
Time deposits	2	6,819,758		6,820,355		6,334,842		6,324,010
Federal funds purchased	2	175,000		175,000		—		—
FHLB advances	2	4,796,000		4,810,446		4,771,000		4,774,160
Notes and other borrowings	2	402,749		416,142		402,830		435,361
Derivative liabilities	2	23,874		23,874		25,373		25,373

Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Schedule of the Total Lending Related Commitments Outstanding

Total lending related commitments outstanding at December 31, 2018 were as follows (in thousands):



Commitments to fund loans	$	508,074
Commitments to purchase loans	518,054
Unfunded commitments under lines of credit	2,853,431
Commercial and standby letters of credit	85,446
	$	3,965,005

Condensed Financial Statements of BankUnited, Inc. (Tables)

12 Months Ended

Dec. 31, 2018

Condensed Financial Statements [Abstract]

Condensed Balance Sheet [Table Text Block]

Condensed Balance Sheets



	December 31, 2018		December 31, 2017
Assets:
Cash and cash equivalents	$	143,843	$	131,696
Investment securities available for sale, at fair value	60,519		63,543
Investment in BankUnited, N.A.	3,110,638		3,239,717
Deferred tax asset, net	10,088		9,456
Other assets	27,319		8,462
Total assets	$	3,352,407	$	3,452,874
Liabilities and Stockholders' Equity:
Notes payable	$	394,390	$	393,725
Other liabilities	34,184		33,087
Stockholders' equity	2,923,833		3,026,062
Total liabilities and stockholders' equity	$	3,352,407	$	3,452,874

Condensed Income Statement [Table Text Block]

Condensed Statements of Income



	Years Ended December 31,
	2018			2017			2016
Income:
Interest and dividends on investment securities available for sale	$	3,532		$	3,580		$	4,280
Service fees from subsidiary	21,000			18,787			21,957
Equity in earnings of subsidiary	349,937			639,250			242,874
Loss on investment securities	(2,805		)	—			—
Total	371,664			661,617			269,111
Expense:
Interest on borrowings	20,165			20,132			20,100
Employee compensation and benefits	28,477			27,032			27,143
Other	5,617			5,047			4,466
Total	54,259			52,211			51,709
Income before income taxes	317,405			609,406			217,402
Benefit for income taxes	(7,461		)	(4,867		)	(8,339		)
Net income	$	324,866		$	614,273		$	225,741

Condensed Cash Flow Statement [Table Text Block]

Condensed Statements of Cash Flows



	Years Ended December 31,
	2018			2017			2016
Cash flows from operating activities:
Net income	$	324,866		$	614,273		$	225,741
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed earnings of subsidiaries	70,064			(519,250		)	(157,374		)
Equity based compensation	23,137			22,692			18,032
Other	(15,654		)	3,343			7,438
Net cash provided by operating activities	402,413			121,058			93,837
Cash flows from investing activities:
Capital contributions to subsidiary	—			(55,000		)	—
Purchase of investment securities available for sale	—			—			(20,150		)
Proceeds from repayments, sale, maturities and calls of investment securities available for sale	—			15,000			19,401
Other	(156		)	(250		)	(3		)
Net cash used in investing activities	(156		)	(40,250		)	(752		)
Cash flows from financing activities:
Dividends paid	(91,305		)	(91,628		)	(89,824		)
Proceeds from exercise of stock options	7,727			62,095			791
Repurchase of common stock	(299,972		)	—			—
Other	(6,560		)	(7,297		)	856
Net cash used in financing activities	(390,110		)	(36,830		)	(88,177		)
Net increase in cash and cash equivalents	12,147			43,978			4,908
Cash and cash equivalents, beginning of period	131,696			87,718			82,810
Cash and cash equivalents, end of period	$	143,843		$	131,696		$	87,718
Supplemental schedule of non-cash investing and financing activities:
Dividends declared, not paid	$	21,673		$	23,055		$	22,510

Quarterly Financial Information (Unaudited) (Tables)

6 Months Ended

12 Months Ended

Jun. 30, 2018

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Information [Table Text Block]

Note 18 Quarterly Financial Information (Unaudited)

Financial information by quarter for the years ended December 31, 2018 and 2017 follows (in thousands, except per share data):



	2018
	Fourth Quarter		Third Quarter		Second Quarter		First Quarter		Total
Interest income	$	414,796	$	357,717	$	348,855	$	327,776	$	1,449,144
Interest expense	119,743		105,749		93,592		79,967		399,051
Net interest income before provision for loan losses	295,053		251,968		255,263		247,809		1,050,093
Provision for loan losses	12,583		1,200		8,995		3,147		25,925
Net interest income after provision for loan losses	282,470		250,768		246,268		244,662		1,024,168
Non-interest income	33,328		38,735		31,973		27,986		132,022
Non-interest expense	246,678		170,798		161,247		161,817		740,540
Income before income taxes	69,120		118,705		116,994		110,831		415,650
Provision for income taxes	16,717		21,377		27,094		25,596		90,784
Net income	$	52,403	$	97,328	$	89,900	$	85,235	$	324,866
Earnings per common share, basic	$	0.50	$	0.90	$	0.82	$	0.78	$	3.01
Earnings per common share, diluted	$	0.50	$	0.90	$	0.82	$	0.77	$	2.99



	2017
	Fourth Quarter			Third Quarter		Second Quarter		First Quarter		Total
Interest income	$	312,645		$	309,443	$	298,835	$	283,538	$	1,204,461
Interest expense	73,819			68,179		59,246		52,945		254,189
Net interest income before provision for loan losses	238,826			241,264		239,589		230,593		950,272
Provision for loan losses	5,174			37,854		13,619		12,100		68,747
Net interest income after provision for loan losses	233,652			203,410		225,970		218,493		881,525
Non-interest income	46,541			53,326		29,893		28,144		157,904
Non-interest expense	161,271			156,705		160,435		156,557		634,968
Income before income taxes	118,922			100,031		95,428		90,080		404,461
Provision (benefit) for income taxes	(298,872		)	32,252		29,021		27,787		(209,812		)
Net income	$	417,794		$	67,779	$	66,407	$	62,293	$	614,273
Earnings per common share, basic	$	3.80		$	0.62	$	0.60	$	0.57	$	5.60
Earnings per common share, diluted	$	3.79		$	0.62	$	0.60	$	0.57	$	5.58

Quarterly Financial Information (Unaudited)

Financial information by quarter for the years ended December 31, 2018 and 2017 follows (in thousands, except per share data):



	2018
	Fourth Quarter		Third Quarter		Second Quarter		First Quarter		Total
Interest income	$	414,796	$	357,717	$	348,855	$	327,776	$	1,449,144
Interest expense	119,743		105,749		93,592		79,967		399,051
Net interest income before provision for loan losses	295,053		251,968		255,263		247,809		1,050,093
Provision for loan losses	12,583		1,200		8,995		3,147		25,925
Net interest income after provision for loan losses	282,470		250,768		246,268		244,662		1,024,168
Non-interest income	33,328		38,735		31,973		27,986		132,022
Non-interest expense	246,678		170,798		161,247		161,817		740,540
Income before income taxes	69,120		118,705		116,994		110,831		415,650
Provision for income taxes	16,717		21,377		27,094		25,596		90,784
Net income	$	52,403	$	97,328	$	89,900	$	85,235	$	324,866
Earnings per common share, basic	$	0.50	$	0.90	$	0.82	$	0.78	$	3.01
Earnings per common share, diluted	$	0.50	$	0.90	$	0.82	$	0.77	$	2.99



	2017
	Fourth Quarter			Third Quarter		Second Quarter		First Quarter		Total
Interest income	$	312,645		$	309,443	$	298,835	$	283,538	$	1,204,461
Interest expense	73,819			68,179		59,246		52,945		254,189
Net interest income before provision for loan losses	238,826			241,264		239,589		230,593		950,272
Provision for loan losses	5,174			37,854		13,619		12,100		68,747
Net interest income after provision for loan losses	233,652			203,410		225,970		218,493		881,525
Non-interest income	46,541			53,326		29,893		28,144		157,904
Non-interest expense	161,271			156,705		160,435		156,557		634,968
Income before income taxes	118,922			100,031		95,428		90,080		404,461
Provision (benefit) for income taxes	(298,872		)	32,252		29,021		27,787		(209,812		)
Net income	$	417,794		$	67,779	$	66,407	$	62,293	$	614,273
Earnings per common share, basic	$	3.80		$	0.62	$	0.60	$	0.57	$	5.60
Earnings per common share, diluted	$	3.79		$	0.62	$	0.60	$	0.57	$	5.58

Earnings Per Common Share (Computation of Basic and Diluted Earnings per Common Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Numerator:
Net income	$ 52,403	$ 97,328	$ 89,900	$ 85,235	$ 417,794	$ 67,779	$ 66,407	$ 62,293	$ 324,866	$ 614,273	$ 225,741
Distributed and undistributed earnings allocated to participating securities									(13,047)	(23,250)	(8,760)
Income allocated to common stockholders for basic earnings per common share									$ 311,819	$ 591,023	$ 216,981
Denominator:
Weighted average common shares outstanding									104,916,865	106,574,448	104,097,182
Less average unvested stock awards									(1,171,994)	(1,104,035)	(1,157,378)
Weighted average shares for basic earnings per common share									103,744,871	105,470,413	102,939,804
Basic earnings per common share	$ 0.50	$ 0.90	$ 0.82	$ 0.78	$ 3.80	$ 0.62	$ 0.60	$ 0.57	$ 3.01	$ 5.60	$ 2.11
Numerator:
Income allocated to common stockholders for basic earnings per common share									$ 311,819	$ 591,023	$ 216,981
Adjustment for earnings reallocated from participating securities									(195)	(263)	62
Income used in calculating diluted earnings per common share									$ 311,624	$ 590,760	$ 217,043
Denominator:
Weighted average shares for basic earnings per common share									103,744,871	105,470,413	102,939,804
Dilutive effect of stock options									332,505	387,074	716,366
Weighted average shares for diluted earnings per common share									104,077,376	105,857,487	103,656,170
Diluted earnings per common share	$ 0.50	$ 0.90	$ 0.82	$ 0.77	$ 3.79	$ 0.62	$ 0.60	$ 0.57	$ 2.99	$ 5.58	$ 2.09

Basis of Presentation and Summary of Significant Accounting Policies (Narrative) (Details)		12 Months Ended
	May 21, 2009 USD ($)	Dec. 31, 2018 USD ($) subsidiary bank	Dec. 31, 2017 USD ($)
Summary of Significant Accounting Policies [Line Items]
Number Of Subsidiaries \| subsidiary		1
Number of loss sharing agreements	2
Percent FDIC will reimburse for covered losses (in Percent)	80.00%
Limit on losses reimbursed at 80%	$ 4,000,000,000
Percent of losses in excess of limit FDIC will reimburse (in Percent)	95.00%
Period of delinquency of principal or interest at which commercial loans are placed on non-accrual status unless the loan is well-secured and in the process of collection (in Duration)		90 days
Period of delinquency of interest at which residential and consumer loans, other than ACI loans, are placed on non-accrual status unless the loan is well-secured and in the process of collection		90 days
Period of principal or interest paid at which residential loans are returned to accrual status (in Duration)		90 days
Maximum period of loans past due reported as current (in Duration)		30 days
Minimum period of delinquency for non-covered loans secured by residential real estate, at which an assessment of collateral value is made (in Duration)		120 days
Maximum period of delinquency at which any outstanding residential loan balance in excess of fair value less cost to sell is charged off (in Duration)		180 days
Period after receipt of notification of filing from the bankruptcy court at which any outstanding balance in excess of fair value of collateral less cost to sell, at which it is charged off (in Duration)		60 days
Period within determination of loss if all borrowers are deceased, at which any outstanding balance in excess of fair value of collateral less cost to sell, at which it is charged off (in Duration)		60 days
Period within days of discovery of fraudulent activity, at which any outstanding balance in excess of fair value of collateral less cost to sell, at which it is charged off (in Duration)		90 days
Period of delinquency of consumer loans, at which, at which they are charged off when management deems them to be uncollectible (in Duration)		120 days
Loans and Leases Receivable, Net Charge-Off Rate Calculation, Banks Used In Assumption \| bank		26
Goodwill		$ 78,000,000	$ 78,000,000
Operating Lease, Right-of-Use Asset		95,000,000
Accounting Standards Update 2018-02 [Domain]
Summary of Significant Accounting Policies [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption		11,100,000
Accounting Standards Update 2016-01 [Member]
Summary of Significant Accounting Policies [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption		(2,200,000)
Accounting Standards Update 2016-02 [Member]
Summary of Significant Accounting Policies [Line Items]
Operating Lease, Liability		104,000,000
Commercial Portfolio Segment [Member]
Summary of Significant Accounting Policies [Line Items]
The value below which non accrual status commercial relationships may be evaluated for impairment at management's discretion		1,000,000
Minimum \| Commercial Portfolio Segment [Member]
Summary of Significant Accounting Policies [Line Items]
The value at which non accrual status commercial relationships are evaluated for impairment		$ 1,000,000
NEW YORK
Summary of Significant Accounting Policies [Line Items]
Loans and Leases Receivable, Net Charge-Off Rate Calculation, Banks Used In Assumption \| bank		5
Building and Building Improvements [Member]
Summary of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life		30 years
Leasehold Improvements [Member] \| Minimum
Summary of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life		5 years
Leasehold Improvements [Member] \| Maximum [Member]
Summary of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life		20 years
Furniture, Fixtures And Equipment [Member] \| Minimum
Summary of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life		5 years
Furniture, Fixtures And Equipment [Member] \| Maximum [Member]
Summary of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life		7 years
Computer Equipment [Member] \| Minimum
Summary of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life		3 years
Computer Equipment [Member] \| Maximum [Member]
Summary of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life		5 years
Software and software licensing rights \| Minimum
Summary of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life		3 years
Software and software licensing rights \| Maximum [Member]
Summary of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life		5 years

Earnings Per Common Share (Potentially Dilutive Securities Outstanding) (Details) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Unvested shares and share units
Antidilutive Securities Excluded from Computation of Earnings per Share [Line Items]
Potentially dilutive securities outstanding (in Shares)	1,463,607	1,431,761	1,303,208
Stock options and warrants
Antidilutive Securities Excluded from Computation of Earnings per Share [Line Items]
Potentially dilutive securities outstanding (in Shares)	1,960	1,850,279	1,850,279

Earnings Per Common Share Earnings per Common Share (Narrative) (Details)	Dec. 31, 2018 shares
Earnings Per Share [Abstract]
Dividend Equivalent Rights	3,023,314

Investment Securities (Schedule of Investment Securities Available for Sale) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 8,090,654	$ 6,587,786
Gross Unrealized Gains	49,030	98,906
Gross Unrealized Losses	(43,325)	(5,860)
Investment securities available for sale, at fair value	8,096,359	6,680,832
Investment securities held to maturity	10,000	10,000
Investments, Amortized Cost	8,161,173	6,597,786
Investment securities (including securities recorded at fair value of $8,156,878 and $6,680,832)	8,166,878	6,690,832
U.S. Treasury securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	39,885	24,981
Gross Unrealized Gains	2	0
Gross Unrealized Losses	(14)	(28)
Investment securities available for sale, at fair value	39,873	24,953
U.S. Government agency and sponsored enterprise residential MBS
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,885,302	2,043,373
Gross Unrealized Gains	16,580	16,094
Gross Unrealized Losses	(4,408)	(1,440)
Investment securities available for sale, at fair value	1,897,474	2,058,027
U.S. Government agency and sponsored enterprise commercial MBS
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	374,569	233,522
Gross Unrealized Gains	1,293	1,330
Gross Unrealized Losses	(1,075)	(344)
Investment securities available for sale, at fair value	374,787	234,508
Private label residential mortgage-backed securities and CMOs
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,539,058	613,732
Gross Unrealized Gains	10,138	16,473
Gross Unrealized Losses	(14,998)	(1,958)
Investment securities available for sale, at fair value	1,534,198	628,247
Private label commercial mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,486,835	1,033,022
Gross Unrealized Gains	5,021	13,651
Gross Unrealized Losses	(6,140)	(258)
Investment securities available for sale, at fair value	1,485,716	1,046,415
Single family rental real estate-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	406,310	559,741
Gross Unrealized Gains	266	3,823
Gross Unrealized Losses	(4,118)	(858)
Investment securities available for sale, at fair value	402,458	562,706
Collateralized loan obligations
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,239,355	720,429
Gross Unrealized Gains	1,060	3,252
Gross Unrealized Losses	(5,217)	0
Investment securities available for sale, at fair value	1,235,198	723,681
Non-mortgage asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	204,372	119,939
Gross Unrealized Gains	1,031	1,808
Gross Unrealized Losses	(1,336)	0
Investment securities available for sale, at fair value	204,067	121,747
State and municipal obligations
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	398,810	640,511
Gross Unrealized Gains	3,684	17,606
Gross Unrealized Losses	(4,065)	(914)
Investment securities available for sale, at fair value	398,429	657,203
SBA securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	514,765	534,534
Gross Unrealized Gains	6,502	16,208
Gross Unrealized Losses	(1,954)	(60)
Investment securities available for sale, at fair value	519,313	550,682
Other debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,393	4,090
Gross Unrealized Gains	3,453	5,030
Gross Unrealized Losses	0	0
Investment securities available for sale, at fair value	4,846	9,120
Marketable equity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		59,912
Gross Unrealized Gains		3,631
Gross Unrealized Losses		0
Marketable Securities, Equity Securities	60,519	$ 63,543
Marketable Equity Securities, Amortized Cost	$ 60,519

Investment Securities (Narrative) (Details) $ in Thousands	12 Months Ended
Investment Securities (Narrative) (Details) $ in Thousands	Dec. 31, 2018 USD ($) security	Dec. 31, 2017 USD ($) security	Dec. 31, 2016 security
Schedule of Available-for-sale Securities [Line Items]
Number of held-to-maturity securities	1	1
Investment securities held to maturity \| $	$ 10,000	$ 10,000
Weighted average life of investment portfolio (in Duration)	4 years 6 months 15 days
Effective duration of investment portfolio (in Duration)	1 year 5 months 1 day
Available-for-sale Securities Pledged as Collateral \| $	$ 2,100,000	$ 2,600,000
Number of securities in unrealized loss positions (in Securities)	218
Number of securities which impairment considered insignificant (in Securities)	53
Available-for-sale securities, gross unrealized loss, considered insignificant \| $	$ 596
Number of securities determined to be other than temporarily impaired during the period	0	0	2
U.S. Government agency and sponsored enterprise residential MBS
Schedule of Available-for-sale Securities [Line Items]
Number of securities in unrealized loss positions (in Securities)	36
U.S. Government agency and sponsored enterprise commercial MBS
Schedule of Available-for-sale Securities [Line Items]
Number of securities in unrealized loss positions (in Securities)	7
Private label residential mortgage-backed securities and CMOs
Schedule of Available-for-sale Securities [Line Items]
Number of securities in unrealized loss positions (in Securities)	38
Private label commercial mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Number of securities in unrealized loss positions (in Securities)	27
Single family rental real estate-backed securities
Schedule of Available-for-sale Securities [Line Items]
Number of securities in unrealized loss positions (in Securities)	13
Collateralized loan obligations
Schedule of Available-for-sale Securities [Line Items]
Number of securities in unrealized loss positions (in Securities)	18
Non-mortgage asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Number of securities in unrealized loss positions (in Securities)	6
State and municipal obligations
Schedule of Available-for-sale Securities [Line Items]
Number of securities in unrealized loss positions (in Securities)	14
SBA securities
Schedule of Available-for-sale Securities [Line Items]
Number of securities in unrealized loss positions (in Securities)	6
Maximum [Member] \| Collateralized loan obligations
Schedule of Available-for-sale Securities [Line Items]
Unrealized loss as a percent of amortized cost on securities in continuous unrealized loss positions (or less, less than)	3.00%
Maximum [Member] \| Non-mortgage asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Unrealized loss as a percent of amortized cost on securities in continuous unrealized loss positions (or less, less than)	3.00%
Maximum [Member] \| SBA securities
Schedule of Available-for-sale Securities [Line Items]
Unrealized loss as a percent of amortized cost on securities in continuous unrealized loss positions (or less, less than)	3.00%

Investment Securities (Schedule of Maturities of Investment Securities Available for Sale) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Due in one year or less, Amortized Cost	$ 939,802
Due after one year through five years, Amortized Cost	4,097,200
Due after five years through ten years, Amortized Cost	2,662,298
Due after ten years, Amortized Cost	391,354
Amortized Cost	8,090,654	$ 6,587,786
Due in one year or less, Fair Value	942,507
Due after one year through five years, Fair Value	4,097,966
Due after five years through ten years, Fair Value	2,662,649
Due after ten years, Fair Value	393,237
Fair Value	$ 8,096,359	$ 6,680,832

Investment Securities (Schedule of Gains and Losses on the Sale and Exchange of Investment Securities Available for Sale) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Proceeds from sale of investment securities available for sale	$ 1,030,810	$ 1,287,591	$ 1,127,983
Gross realized gains:	8,616	37,530	14,924
Gross realized losses:	(2,514)	(4,064)	0
Net realized gain	6,102	33,466	14,924
Unrealized Gain (Loss) on Securities	(2,943)	0	0
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities	0	0	463
Gain on investment securities, net	$ 3,159	$ 33,466	$ 14,461

- Definition

This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments.

+ References + Details

Investment Securities (Schedule of the Aggregate Fair Value and Amount by which Amortized Cost Exceeds Fair Value for Investment Securities that are in Unrealized Loss Positions) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Document Fiscal Year Focus	2018
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 3,658,094	$ 1,080,493
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(28,077)	(4,546)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	593,775	94,520
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(15,248)	(1,314)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	4,251,869	1,175,013
Gross Unrealized Losses	(43,325)	(5,860)
U.S. Treasury securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	14,921	24,953
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(14)	(28)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	14,921	24,953
Gross Unrealized Losses	(14)	(28)
U.S. Government agency and sponsored enterprise residential MBS
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	450,666	471,120
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(1,828)	(1,141)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	87,311	13,028
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(2,580)	(299)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	537,977	484,148
Gross Unrealized Losses	(4,408)	(1,440)
U.S. Government agency and sponsored enterprise commercial MBS
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	146,096	26,265
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(352)	(344)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	25,815	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(723)	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	171,911	26,265
Gross Unrealized Losses	(1,075)	(344)
Private label residential mortgage-backed securities and CMOs
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	759,921	330,068
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(7,073)	(1,858)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	278,108	5,083
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(7,925)	(100)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,038,029	335,151
Gross Unrealized Losses	(14,998)	(1,958)
Private label commercial mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	742,092	81,322
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(5,371)	(258)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	39,531	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(769)	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	781,623	81,322
Gross Unrealized Losses	(6,140)	(258)
Single family rental real estate-backed securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	234,305	94,750
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(1,973)	(858)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	85,282	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(2,145)	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	319,587	94,750
Gross Unrealized Losses	(4,118)	(858)
Collateralized loan obligations
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	749,047
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(5,217)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	749,047
Gross Unrealized Losses	(5,217)	0
Non-mortgage asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	136,100
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(1,336)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	136,100
Gross Unrealized Losses	(1,336)	0
State and municipal obligations
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	208,971	30,715
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(3,522)	(49)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	46,247	60,982
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(543)	(865)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	255,218	91,697
Gross Unrealized Losses	(4,065)	(914)
SBA securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	215,975	21,300
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(1,391)	(10)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	31,481	15,427
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(563)	(50)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	247,456	36,727
Gross Unrealized Losses	$ (1,954)	$ (60)

Loans and Allowance for Loan and Lease Losses (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable Investment Past Due [Line Items]
Capital Leases, Net Investment in Direct Financing Leases	$ 739,245
Purchases of loans	1,308,772	$ 1,300,996	$ 1,266,097
Unpaid principal balance of real estate loans pledged as security for FHLB advances	9,800,000
Recorded investment of real estate loans pledged as security for FHLB advances	9,600,000
Unpaid principal balance of covered loans retained after the termination of the Single Family Share-Loss Agreement	401,000
Covered loans net of premiums, discounts and deferred fees and costs	201,376	503,118
Unpaid principal balance of ACI loans	400,000	1,100,000
Impaired Financing Receivable, Interest Income, Accrual Method		9,600
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans	4,974	4,100
1-4 single family residential
Financing Receivable Investment Past Due [Line Items]
Purchases of loans	1,308,772	1,300,996
Residential and Other Consumer
Financing Receivable Investment Past Due [Line Items]
Mortgage Loans in Process of Foreclosure, Amount	0	11,000
Commercial Lending Subsidiaries
Financing Receivable Investment Past Due [Line Items]
Capital Leases, Net Investment in Direct Financing Leases	739,000	738,000
Covered [Member]
Financing Receivable Investment Past Due [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs	201,376	503,118
Covered [Member] \| Residential and Other Consumer
Financing Receivable Investment Past Due [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs	201,376	503,118
Other Real Estate, Foreclosed Assets, and Repossessed Assets	6,000	3,000
Covered [Member] \| Commercial
Financing Receivable Investment Past Due [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs	0	$ 0
Minimum \| Commercial
Financing Receivable Investment Past Due [Line Items]
Financing receivable credit quality indicator, the value at which relationships are reevaluated at least annually	1,000
Maximum [Member] \| Commercial
Financing Receivable Investment Past Due [Line Items]
Financing receivable credit quality indicator, the value at which relationships are reevaluated at least annually	3,000
US Government Agency Insured Loans [Member] \| 1-4 single family residential
Financing Receivable Investment Past Due [Line Items]
Purchases of loans	370,834
US Government Agency Insured Loans [Member] \| Residential and Other Consumer
Financing Receivable Investment Past Due [Line Items]
Mortgage Loans in Process of Foreclosure, Amount	$ 85,000

Loans and Allowance for Loan and Lease Losses (Schedule of Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans, gross	$ 21,730,211	$ 20,865,221
Loans, gross	21,932,992	21,371,487
Non-covered premiums, discounts and deferred fees and costs, net	45,421	48,165
Premiums, discounts and deferred fees and costs, net	44,016	45,017
Non-covered loans, net of premiums, discounts and deferred fees and costs	21,775,632	20,913,386
Covered loans net of premiums, discounts and deferred fees and costs	201,376	503,118
Loans net of premiums, discounts and deferred fees and costs	21,977,008	21,416,504
Non-covered Allowance for loan and lease losses	(109,901)	(144,537)
Allowance for loan and lease losses	(109,931)	(144,795)
Non-covered loans, net	21,665,731	20,768,849
Loans, net	$ 21,867,077	$ 21,271,709
Percent of Total	100.00%	100.00%
1-4 single family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans, gross	$ 4,404,047	$ 4,089,994
Loans, gross	4,606,828	4,596,260
Loans net of premiums, discounts and deferred fees and costs	$ 4,664,920	$ 4,648,997
Percent of Total	21.00%	21.50%
Home equity loans and lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans, gross	$ 1,393	$ 1,654
Loans, gross	$ 1,393	$ 1,654
Percent of Total	0.00%	0.00%
Other Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans, gross	$ 15,976	$ 20,512
Loans, gross	15,976	20,512
Non-covered loans, net of premiums, discounts and deferred fees and costs	$ 15,947	$ 20,473
Percent of Total	0.10%	0.10%
Residential and Other Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans, gross	$ 4,687,117	$ 4,138,980
Loans, gross	$ 4,889,898	$ 4,645,246
Percent of Total	22.30%	21.70%
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans, gross	$ 2,583,331	$ 3,215,697
Loans, gross	2,583,331	3,215,697
Non-covered loans, net of premiums, discounts and deferred fees and costs	$ 2,585,421	$ 3,218,953
Percent of Total	11.80%	15.00%
Commercial real estate, Non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans, gross	$ 4,700,188	$ 4,485,276
Loans, gross	4,700,188	4,485,276
Non-covered loans, net of premiums, discounts and deferred fees and costs	$ 4,688,880	$ 4,474,801
Percent of Total	21.40%	21.00%
Construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans, gross	$ 227,134	$ 310,999
Loans, gross	227,134	310,999
Non-covered loans, net of premiums, discounts and deferred fees and costs	$ 226,840	$ 310,484
Percent of Total	1.00%	1.50%
Commercial real estate, Owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans, gross	$ 2,122,381	$ 2,014,908
Loans, gross	2,122,381	2,014,908
Non-covered loans, net of premiums, discounts and deferred fees and costs	$ 2,119,880	$ 2,012,742
Percent of Total	9.70%	9.40%
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans, gross	$ 4,801,226	$ 4,145,785
Loans, gross	$ 4,801,226	$ 4,145,785
Percent of Total	21.90%	19.40%
Commercial Lending Subsidiaries
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans, gross	$ 2,608,834	$ 2,553,576
Loans, gross	$ 2,608,834	$ 2,553,576
Percent of Total	11.90%	12.00%
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans, gross	$ 17,043,094	$ 16,726,241
Loans, gross	17,043,094	16,726,241
Non-covered loans, net of premiums, discounts and deferred fees and costs	$ 17,028,019	$ 16,717,306
Percent of Total	77.70%	78.30%
ACI Loans, Non-Covered
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	$ 17,925	$ 33,776
ACI Loans, Non-Covered \| Residential and Other Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	0	0
ACI Loans, Non-Covered \| Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans, gross	17,925	33,776
Non-covered loans, net of premiums, discounts and deferred fees and costs	17,925	33,776
ACI Loans, Covered [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans, gross	190,223	479,068
Covered loans net of premiums, discounts and deferred fees and costs	190,223	479,068
Covered Allowance for loan and lease losses	0	0
Covered loans, net	190,223	479,068
ACI Loans, Covered [Member] \| 1-4 single family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans, gross	190,223	479,068
Covered loans net of premiums, discounts and deferred fees and costs	190,223	479,068
ACI Loans, Covered [Member] \| Home equity loans and lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans, gross	0	0
ACI Loans, Covered [Member] \| Residential and Other Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans, gross	190,223	479,068
Non-ACI
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans, gross	12,558	27,198
Covered premiums, discounts and deferred fees and costs, net	(1,405)	(3,148)
Covered loans net of premiums, discounts and deferred fees and costs	11,153	24,050
Covered Allowance for loan and lease losses	(30)	(258)
Covered loans, net	11,123	23,792
Non-ACI \| 1-4 single family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans, gross	12,558	27,198
Covered loans net of premiums, discounts and deferred fees and costs	11,153	24,050
Non-ACI \| Home equity loans and lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans, gross	0	0
Non-ACI \| Residential and Other Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans, gross	12,558	27,198
US Government Agency Insured Loans [Member] \| 1-4 single family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans, gross	265,701	26,820
Loans, gross	$ 265,701	$ 26,820
Percent of Total	1.20%	0.10%

Loans and Allowance for Loan and Lease Losses Loans and Allowance for Loan and Lease Losses (Direct Financing Leases) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Capital Leases, Net Investment in Direct Financing Leases, Minimum Payments to be Received	$ 808,921	$ 792,064
Capital Leases, Net Investment in Direct Financing Leases, Unguaranteed Residual Values of Leased Property	7,355	17,872
Capital Leases, Net Investment in Direct Financing Leases, Gross Investment	816,276	809,936
Capital Leases, Net Investment in Direct Financing Leases, Deferred Income	81,864	76,900
Capital Leases, Net Investment in Direct Financing Leases, Initial Direct Costs	4,833	$ 5,184
Capital Leases, Net Investment in Direct Financing Leases	739,245
Capital Leases, Future Minimum Payments Receivable, Next Twelve Months	197,004
Capital Leases, Future Minimum Payments, Receivable in Two Years	169,437
Capital Leases, Future Minimum Payments, Receivable in Three Years	109,057
Capital Leases, Future Minimum Payments, Receivable in Four Years	69,242
Capital Leases, Future Minimum Payments, Receivable in Five Years	56,312
Capital Leases, Future Minimum Payments, Receivable Thereafter	$ 207,869

Loans and Allowance for Loan and Lease Losses (Schedule for Accretable Yield Rollforward) (Details) - ACI loans - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Beginning Balance	$ 455,059	$ 675,385	$ 902,565
Reclassifications from non-accretable difference	128,499	81,501	76,751
Accretion	(369,915)	(301,827)	(303,931)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease)	78,204
Ending Balance	$ 291,847	$ 455,059	$ 675,385

Loans and Allowance for Loan and Lease Losses (Schedule of Sold Covered Residential Loans to Third Parties on a Non-recourse Basis) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Document Fiscal Year Focus	2018
Covered loans net of premiums, discounts and deferred fees and costs	$ 201,376	$ 503,118
Unpaid principal balance of covered loans retained after the termination of the Single Family Share-Loss Agreement	401,000
Gain on sale of loans, net	15,864	27,589	$ (4,406)
Gain on FDIC indemnification, net	3,388	(1,523)	11,615
Covered [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs	201,376	503,118
Covered [Member] \| Residential and Other Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs	201,376	503,118
UPB of loans sold	539,853	203,970	241,348
Cash proceeds, net of transaction costs	488,972	169,828	171,367
Recorded investment in loans sold	483,240	152,422	185,837
Gain on sale of loans, net	$ 5,732	$ 17,406	$ (14,470)

Loans and Allowance for Loan and Lease Losses (ALLL Rollforward) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan and lease losses, beginning of period				$ 144,795				$ 152,953	$ 144,795	$ 152,953	$ 125,828
Provision for loan losses	$ 12,583	$ 1,200	$ 8,995	3,147	$ 5,174	$ 37,854	$ 13,619	12,100	25,925	68,747	50,911
Charge-offs									(67,084)	(81,193)	(27,110)
Recoveries									6,295	4,288	3,324
Allowance for loan and lease losses, end of period	109,931				144,795				109,931	144,795	152,953
Residential and Other Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan and lease losses, beginning of period				10,720				11,503	10,720	11,503	16,211
Provision for loan losses									1,032	2,452	(3,446)
Charge-offs									(1,465)	(3,328)	(1,368)
Recoveries									501	93	106
Allowance for loan and lease losses, end of period	10,788				10,720				10,788	10,720	11,503
Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan and lease losses, beginning of period				134,075				$ 141,450	134,075	141,450	109,617
Provision for loan losses									24,893	66,295	54,357
Charge-offs									(65,619)	(77,865)	(25,742)
Recoveries									5,794	4,195	3,218
Allowance for loan and lease losses, end of period	99,143				134,075				99,143	134,075	141,450
Covered [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan and lease losses, beginning of period				258					258
Provision for loan losses									752	1,358	(1,681)
Charge-offs									(1,200)	(3,327)	(1,216)
Recoveries									220	127	129
Allowance for loan and lease losses, end of period	30				258				30	258
Covered [Member] \| Residential and Other Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan and lease losses, beginning of period				258					258
Provision for loan losses									752	1,418	(1,632)
Charge-offs									(1,200)	(3,327)	(1,216)
Recoveries									220	67	80
Allowance for loan and lease losses, end of period	30				258				30	258
Covered [Member] \| Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan and lease losses, beginning of period				0					0
Provision for loan losses									0	(60)	(49)
Charge-offs									0	0	0
Recoveries									0	60	49
Allowance for loan and lease losses, end of period	0				0				0	0
Non-Covered [Domain]
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan and lease losses, beginning of period				144,537					144,537
Provision for loan losses									25,173	67,389	52,592
Charge-offs									(65,884)	(77,866)	(25,894)
Recoveries									6,075	4,161	3,195
Allowance for loan and lease losses, end of period	109,901				144,537				109,901	144,537
Non-Covered [Domain] \| Residential and Other Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan and lease losses, beginning of period				10,462					10,462
Provision for loan losses									280	1,034	(1,814)
Charge-offs									(265)	(1)	(152)
Recoveries									281	26	26
Allowance for loan and lease losses, end of period	10,758				10,462				10,758	10,462
Non-Covered [Domain] \| Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan and lease losses, beginning of period				$ 134,075					134,075
Provision for loan losses									24,893	66,355	54,406
Charge-offs									(65,619)	(77,865)	(25,742)
Recoveries									5,794	4,135	$ 3,169
Allowance for loan and lease losses, end of period	$ 99,143				$ 134,075				$ 99,143	$ 134,075

Loans and Allowance for Loan and Lease Losses Loans and Allowance for Loan and Lease Losses (Balance of ALLL and Related Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	$ 109,931	$ 144,795	$ 152,953	$ 125,828
Covered loans net of premiums, discounts and deferred fees and costs	201,376	503,118
Loans net of premiums, discounts and deferred fees and costs	21,977,008	21,416,504
Loans and Leases Receivable, Net of Deferred Income	21,775,632	20,913,386
Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	10,788	10,720	11,503	16,211
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	99,143	134,075	$ 141,450	$ 109,617
Loans and Leases Receivable, Net of Deferred Income	17,028,019	16,717,306
Covered [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	30	258
Covered loans net of premiums, discounts and deferred fees and costs	201,376	503,118
Covered [Member] \| Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	30	258
Covered loans net of premiums, discounts and deferred fees and costs	201,376	503,118
Covered [Member] \| Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	0	0
Covered loans net of premiums, discounts and deferred fees and costs	0	0
Non-Covered [Domain]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	109,901	144,537
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	12,277	18,839
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	97,624	125,698
Financing Receivable, Individually Evaluated for Impairment	116,531	174,940
Financing Receivable, Collectively Evaluated for Impairment	21,641,176	20,704,670
Loans and Leases Receivable, Net of Deferred Income	21,775,632	20,913,386
Non-Covered [Domain] \| Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	10,758	10,462
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	134	63
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	10,624	10,399
Financing Receivable, Individually Evaluated for Impairment	7,690	1,234
Financing Receivable, Collectively Evaluated for Impairment	4,739,914	4,194,846
Loans and Leases Receivable, Net of Deferred Income	4,747,604	4,196,080
Non-Covered [Domain] \| Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses	99,143	134,075
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	12,143	18,776
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	87,000	115,299
Financing Receivable, Individually Evaluated for Impairment	108,841	173,706
Financing Receivable, Collectively Evaluated for Impairment	16,901,262	16,509,824
Loans and Leases Receivable, Net of Deferred Income	17,028,028	16,717,306
ACI Loans, Non-covered
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Net of Deferred Income	17,925	33,776
ACI Loans, Non-covered \| Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0	0
ACI Loans, Non-covered \| Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Net of Deferred Income	17,925	33,776
ACI loans \| Covered [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans net of premiums, discounts and deferred fees and costs	190,223	479,068
ACI loans \| Covered [Member] \| Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans net of premiums, discounts and deferred fees and costs	190,223	479,068
ACI loans \| Covered [Member] \| Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans net of premiums, discounts and deferred fees and costs	0	0
Non-ACI loans [Member] \| Covered [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0	118
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	30	140
Financing Receivable, Individually Evaluated for Impairment	0	2,221
Financing Receivable, Collectively Evaluated for Impairment	11,153	21,829
Non-ACI loans [Member] \| Covered [Member] \| Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0	118
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	30	140
Financing Receivable, Individually Evaluated for Impairment	0	2,221
Financing Receivable, Collectively Evaluated for Impairment	11,153	21,829
Non-ACI loans [Member] \| Covered [Member] \| Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0	0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	0	0
Financing Receivable, Individually Evaluated for Impairment	0	0
Financing Receivable, Collectively Evaluated for Impairment	$ 0	$ 0

Loans and Allowance for Loan and Lease Losses (Impaired Financing Receivables) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable Impaired [Line Items]
Average recorded investment in impaired loans									$ 174,598	$ 203,452	$ 116,960
Financing Receivable, Allowance for Credit Losses	$ 109,931				$ 144,795				$ 109,931	144,795	152,953	$ 125,828
Document Fiscal Year Focus									2018
Recorded Investment, Total	116,531				174,940				$ 116,531	174,940
UPB, Total	116,284				174,865				116,284	174,865
Related Specific Allowance, Impaired loans	12,277				18,839				12,277	18,839
Provision for loan losses	12,583	$ 1,200	$ 8,995	$ 3,147	5,174	$ 37,854	$ 13,619	$ 12,100	25,925	68,747	50,911
Allowance for Loan and Lease Losses, Write-offs									(67,084)	(81,193)	(27,110)
Residential and Other Consumer
Financing Receivable Impaired [Line Items]
Financing Receivable, Allowance for Credit Losses	10,788				10,720				10,788	10,720	11,503	16,211
Recorded Investment, Total	7,690				1,234				7,690	1,234
UPB, Total	7,546				1,212				7,546	1,212
Related Specific Allowance, Impaired loans	134				63				134	63
Provision for loan losses									1,032	2,452	(3,446)
Allowance for Loan and Lease Losses, Write-offs									(1,465)	(3,328)	(1,368)
Multi-family
Financing Receivable Impaired [Line Items]
Average recorded investment in impaired loans									25,679	4,259	0
Recorded Investment, With no specific allowance recorded	25,560				0				25,560	0
Recorded Investment, With a specific allowance recorded	0				23,173				0	23,173
UPB, With no specific allowance recorded	25,592				0				25,592	0
UPB, With a specific allowance recorded	0				23,175				0	23,175
Related Specific Allowance, Impaired loans	0				1,732				0	1,732
Commercial real estate, Non-owner occupied
Financing Receivable Impaired [Line Items]
Average recorded investment in impaired loans									14,106	5,537	710
Recorded Investment, With no specific allowance recorded	12,293				10,922				12,293	10,922
UPB, With no specific allowance recorded	12,209				10,838				12,209	10,838
Construction and land
Financing Receivable Impaired [Line Items]
Average recorded investment in impaired loans									6,551	2,789	797
Recorded Investment, With no specific allowance recorded	9,923				1,175				9,923	1,175
UPB, With no specific allowance recorded	9,925				1,175				9,925	1,175
Commercial real estate, Owner occupied
Financing Receivable Impaired [Line Items]
Average recorded investment in impaired loans									16,207	19,882	14,645
Recorded Investment, With no specific allowance recorded	9,007				22,002				9,007	22,002
Recorded Investment, With a specific allowance recorded	3,316				3,075				3,316	3,075
UPB, With no specific allowance recorded	9,024				22,025				9,024	22,025
UPB, With a specific allowance recorded	3,322				3,079				3,322	3,079
Related Specific Allowance, Impaired loans	844				2,960				844	2,960
Taxi medallion [Member]
Financing Receivable Impaired [Line Items]
Average recorded investment in impaired loans									79,786	108,977	45,012
Recorded Investment, With no specific allowance recorded	775				13,560				775	13,560
Recorded Investment, With a specific allowance recorded	0				92,507				0	92,507
UPB, With no specific allowance recorded	775				13,559				775	13,559
UPB, With a specific allowance recorded	0				92,508				0	92,508
Related Specific Allowance, Impaired loans	0				12,214				0	12,214
Other Commercial and industrial [Member]
Financing Receivable Impaired [Line Items]
Average recorded investment in impaired loans									17,602	38,275	40,443
Recorded Investment, With no specific allowance recorded	12,739				345				12,739	345
Recorded Investment, With a specific allowance recorded	10,939				3,626				10,939	3,626
UPB, With no specific allowance recorded	12,744				374				12,744	374
UPB, With a specific allowance recorded	10,946				3,624				10,946	3,624
Related Specific Allowance, Impaired loans	3,831				1,540				3,831	1,540
Commercial Lending Subsidiaries
Financing Receivable Impaired [Line Items]
Average recorded investment in impaired loans									9,757	22,865	15,052
Recorded Investment, With no specific allowance recorded	3,152				0				3,152	0
Recorded Investment, With a specific allowance recorded	19,471				3,321				19,471	3,321
UPB, With no specific allowance recorded	3,149				0				3,149	0
UPB, With a specific allowance recorded	19,385				3,296				19,385	3,296
Related Specific Allowance, Impaired loans	6,737				330				6,737	330
Commercial
Financing Receivable Impaired [Line Items]
Average recorded investment in impaired loans									169,688	202,584
Financing Receivable, Allowance for Credit Losses	99,143				134,075				99,143	134,075	141,450	$ 109,617
Recorded Investment, Total	108,841				173,706				108,841	173,706
UPB, Total	108,738				173,653				108,738	173,653
Related Specific Allowance, Impaired loans	12,143				18,776				12,143	18,776
Provision for loan losses									24,893	66,295	54,357
Allowance for Loan and Lease Losses, Write-offs									(65,619)	(77,865)	(25,742)
New Loans [Member] \| Commercial real estate, Non-owner occupied
Financing Receivable Impaired [Line Items]
UPB, With a specific allowance recorded	1,667								1,667
Related Specific Allowance, Impaired loans	731								731
Non-Covered [Domain] \| 1-4 single family residential
Financing Receivable Impaired [Line Items]
Average recorded investment in impaired loans									4,910	868	301
Recorded Investment, With no specific allowance recorded	5,724				120				5,724	120
Recorded Investment, With a specific allowance recorded	1,966				1,114				1,966	1,114
UPB, With no specific allowance recorded	5,605				122				5,605	122
UPB, With a specific allowance recorded	1,941				1,090				1,941	1,090
Related Specific Allowance, Impaired loans	134				63				134	63
Non-Covered [Domain] \| Home equity loans and lines of credit
Financing Receivable Impaired [Line Items]
Average recorded investment in impaired loans									0	0	0
Non-Covered [Domain] \| Residential and Other Consumer
Financing Receivable Impaired [Line Items]
Average recorded investment in impaired loans									4,910	868	301
Non-Covered [Domain] \| Commercial real estate, Non-owner occupied
Financing Receivable Impaired [Line Items]
Recorded Investment, With a specific allowance recorded	1,666				0				1,666	0
UPB, With a specific allowance recorded					0					0
Related Specific Allowance, Impaired loans					0					0
Non-Covered [Domain] \| Commercial
Financing Receivable Impaired [Line Items]
Average recorded investment in impaired loans											116,659
Non-ACI Loans, Covered [Member] \| 1-4 single family residential
Financing Receivable Impaired [Line Items]
Average recorded investment in impaired loans									1,743	2,345	3,067
Recorded Investment, With no specific allowance recorded	0				1,061				0	1,061
Recorded Investment, With a specific allowance recorded	0				1,160				0	1,160
UPB, With no specific allowance recorded	0				1,203				0	1,203
UPB, With a specific allowance recorded	0				1,314				0	1,314
Related Specific Allowance, Impaired loans	0				118				0	118
Non-ACI Loans, Covered [Member] \| Home equity loans and lines of credit
Financing Receivable Impaired [Line Items]
Average recorded investment in impaired loans									0	8,403	9,225
Non-ACI Loans, Covered [Member] \| Residential and Other Consumer
Financing Receivable Impaired [Line Items]
Average recorded investment in impaired loans									1,743	10,748	12,292
Recorded Investment, Total	0				2,221				0	2,221
UPB, Total	0				2,517				0	2,517
Related Specific Allowance, Impaired loans	0				118				0	118
Covered [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, Allowance for Credit Losses	30				258				30	258
Provision for loan losses									752	1,358	(1,681)
Allowance for Loan and Lease Losses, Write-offs									(1,200)	(3,327)	(1,216)
Covered [Member] \| Residential and Other Consumer
Financing Receivable Impaired [Line Items]
Financing Receivable, Allowance for Credit Losses	30				258				30	258
Provision for loan losses									752	1,418	(1,632)
Allowance for Loan and Lease Losses, Write-offs									(1,200)	(3,327)	(1,216)
Covered [Member] \| Commercial
Financing Receivable Impaired [Line Items]
Financing Receivable, Allowance for Credit Losses	0				0				0	0
Provision for loan losses									0	(60)	(49)
Allowance for Loan and Lease Losses, Write-offs									0	0	0
Non-Covered [Domain]
Financing Receivable Impaired [Line Items]
Financing Receivable, Allowance for Credit Losses	109,901				144,537				109,901	144,537
Provision for loan losses									25,173	67,389	52,592
Allowance for Loan and Lease Losses, Write-offs									(65,884)	(77,866)	(25,894)
Non-Covered [Domain] \| Residential and Other Consumer
Financing Receivable Impaired [Line Items]
Financing Receivable, Allowance for Credit Losses	10,758				10,462				10,758	10,462
Provision for loan losses									280	1,034	(1,814)
Allowance for Loan and Lease Losses, Write-offs									(265)	(1)	(152)
Non-Covered [Domain] \| Commercial
Financing Receivable Impaired [Line Items]
Financing Receivable, Allowance for Credit Losses	$ 99,143				$ 134,075				99,143	134,075
Provision for loan losses									24,893	66,355	54,406
Allowance for Loan and Lease Losses, Write-offs									$ (65,619)	$ (77,865)	$ (25,742)

Loans and Allowance for Loan and Lease Losses Loans and Allowance for Loan and Lease Losses (Schedule of Average Recorded Investment in Impaired Loans) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Document Fiscal Year Focus		2018
Average recorded investment in impaired loans		$ 174,598	$ 203,452	$ 116,960
1-4 single family residential \| Non-ACI Loans, Covered [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment in impaired loans		1,743	2,345	3,067
1-4 single family residential \| Non-Covered [Domain]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment in impaired loans		4,910	868	301
Home equity loans and lines of credit \| ACI loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment in impaired loans	$ 3,900
Home equity loans and lines of credit \| Non-ACI Loans, Covered [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment in impaired loans		0	8,403	9,225
Home equity loans and lines of credit \| Non-Covered [Domain]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment in impaired loans		0	0	0
Residential and Other Consumer \| Non-ACI Loans, Covered [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment in impaired loans		1,743	10,748	12,292
Residential and Other Consumer \| Non-Covered [Domain]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment in impaired loans		4,910	868	301
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment in impaired loans		25,679	4,259	0
Commercial real estate, Non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment in impaired loans		14,106	5,537	710
Construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment in impaired loans		6,551	2,789	797
Commercial real estate, Owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment in impaired loans		16,207	19,882	14,645
Taxi medallion [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment in impaired loans		79,786	108,977	45,012
Other Commercial and industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment in impaired loans		17,602	38,275	40,443
Commercial Lending Subsidiaries
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment in impaired loans		9,757	22,865	15,052
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment in impaired loans		$ 169,688	$ 202,584
Commercial \| Non-Covered [Domain]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment in impaired loans				$ 116,659

Loans and Allowance for Loan and Lease Losses (Schedule of Recorded Investment in Loans, Other than ACI Loans, on Non-Accrual Status) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Document Fiscal Year Focus	2018
Financing Receivable, Recorded Investment, Nonaccrual Status	$ 129,243	$ 170,065
Non-Covered [Domain]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	700	1,900
1-4 single family residential \| Non-Covered [Domain]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	6,316	9,705
1-4 single family residential \| Non-ACI Loans, Covered [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	0	1,341
Other Consumer Loans \| Non-Covered [Domain]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	288	821
Residential and Other Consumer \| Non-Covered [Domain]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	6,604	10,526
Residential and Other Consumer \| Non-ACI Loans, Covered [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	0	1,341
Multi-family \| New Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	25,560	0
Commercial real estate, Non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	16,050	12,716
Construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	9,923	1,175
Commercial real estate, Owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	19,789	29,020
Taxi medallion [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	775	106,067
Other Commercial and industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	27,809	7,049
Commercial Lending Subsidiaries
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	22,733	3,512
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	$ 122,639	$ 159,539

Loans and Allowance for Loan and Lease Losses Loans and Allowance for Loan and Lease Losses (Schedule of Loan Concentrations by States) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Document Fiscal Year Focus	2018
Non-covered loans, net of premiums, discounts and deferred fees and costs	$ 21,775,632	$ 20,913,386
Covered loans net of premiums, discounts and deferred fees and costs	201,376	503,118
Loans net of premiums, discounts and deferred fees and costs	21,977,008	21,416,504
1-4 single family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans net of premiums, discounts and deferred fees and costs	$ 4,664,920	$ 4,648,997
Percent of loans by state	100.00%	100.00%
1-4 single family residential \| Non-Covered [Domain]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	$ 4,463,544	$ 4,145,879
Percent of loans by state	100.00%	100.00%
1-4 single family residential \| Covered [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs	$ 201,376	$ 503,118
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	17,028,019	16,717,306
California [Member] \| 1-4 single family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans net of premiums, discounts and deferred fees and costs	$ 1,177,221	$ 1,117,827
Percent of loans by state	25.20%	24.00%
California [Member] \| 1-4 single family residential \| Non-Covered [Domain]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	$ 1,172,470	$ 1,094,047
Percent of loans by state	26.30%	26.40%
California [Member] \| 1-4 single family residential \| Covered [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs	$ 4,751	$ 23,780
New York [Member] \| 1-4 single family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans net of premiums, discounts and deferred fees and costs	$ 977,146	$ 888,178
Percent of loans by state	20.90%	19.10%
New York [Member] \| 1-4 single family residential \| Non-Covered [Domain]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	$ 971,121	$ 871,331
Percent of loans by state	21.80%	21.00%
New York [Member] \| 1-4 single family residential \| Covered [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs	$ 6,025	$ 16,847
New York [Member] \| Commercial Portfolio Segment [Member] \| Non-Covered [Domain]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percent of loans by state	32.50%	36.40%
Florida [Member] \| 1-4 single family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans net of premiums, discounts and deferred fees and costs	$ 645,020	$ 807,936
Percent of loans by state	13.80%	17.40%
Florida [Member] \| 1-4 single family residential \| Non-Covered [Domain]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	$ 520,427	$ 526,540
Percent of loans by state	11.70%	12.70%
Florida [Member] \| 1-4 single family residential \| Covered [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs	$ 124,593	$ 281,396
Florida [Member] \| Commercial Portfolio Segment [Member] \| Non-Covered [Domain]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percent of loans by state	44.80%	43.40%
DISTRICT OF COLUMBIA \| 1-4 single family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans net of premiums, discounts and deferred fees and costs	$ 183,211	$ 171,435
Percent of loans by state	3.90%	3.70%
DISTRICT OF COLUMBIA \| 1-4 single family residential \| Non-Covered [Domain]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	$ 182,399	$ 169,502
Percent of loans by state	4.10%	4.10%
DISTRICT OF COLUMBIA \| 1-4 single family residential \| Covered [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs	$ 812	$ 1,933
Virginia [Member] \| 1-4 single family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans net of premiums, discounts and deferred fees and costs	$ 184,756	$ 204,202
Percent of loans by state	4.00%	4.40%
Virginia [Member] \| 1-4 single family residential \| Non-Covered [Domain]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	$ 179,132	$ 181,912
Percent of loans by state	4.00%	4.40%
Virginia [Member] \| 1-4 single family residential \| Covered [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs	$ 5,624	$ 22,290
Others [Member] \| 1-4 single family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans net of premiums, discounts and deferred fees and costs	$ 1,497,566	$ 1,459,419
Percent of loans by state	32.20%	31.40%
Others [Member] \| 1-4 single family residential \| Non-Covered [Domain]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	$ 1,437,995	$ 1,302,547
Percent of loans by state	32.10%	31.40%
Others [Member] \| 1-4 single family residential \| Covered [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs	$ 59,571	$ 156,872

Loans and Allowance for Loan and Lease Losses Loans and Allowance for Loan and Lease Losses (Schedule of Troubled Debt Restructurings) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Financing Receivable, Modifications [Line Items]
Document Fiscal Year Focus	2018
Non-Covered [Domain]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	47	124	93
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 20,116	$ 78,438	$ 100,279
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	21	13	19
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 5,655	$ 3,320	$ 13,130
Non-Covered [Domain] \| 1-4 single family residential
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	36	7	2
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 6,462	$ 676	$ 326
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	18	5	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 2,489	$ 595	$ 0
Non-Covered [Domain] \| Multi-family
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts		2
Financing Receivable, Modifications, Post-Modification Recorded Investment		$ 23,173
Financing Receivable, Modifications, Subsequent Default, Number of Contracts		0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		$ 0
Non-Covered [Domain] \| Commercial real estate, Non-owner occupied
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	3
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 5,932
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 2,949
Non-Covered [Domain] \| Commercial real estate, Owner occupied
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	2	3	3
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 1,076	$ 4,685	$ 5,117
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0	$ 491
Non-Covered [Domain] \| Taxi medallion [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts		110	74
Financing Receivable, Modifications, Post-Modification Recorded Investment		$ 48,526	$ 64,854
Financing Receivable, Modifications, Subsequent Default, Number of Contracts		8	15
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		$ 2,725	$ 8,657
Non-Covered [Domain] \| Other Commercial and industrial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	6	2	8
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 6,646	$ 1,378	$ 23,247
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	2	0	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 217	$ 0	$ 1,482
Non-Covered [Domain] \| Commercial Lending Subsidiaries
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts			6
Financing Receivable, Modifications, Post-Modification Recorded Investment			$ 6,735
Financing Receivable, Modifications, Subsequent Default, Number of Contracts			1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment			$ 2,500
Non-ACI Loans, Covered [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts			17
Financing Receivable, Modifications, Post-Modification Recorded Investment			$ 2,016
Financing Receivable, Modifications, Subsequent Default, Number of Contracts			1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment			$ 370
ACI Loans, Covered [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts			1
Financing Receivable, Modifications, Post-Modification Recorded Investment			$ 825
Financing Receivable, Modifications, Subsequent Default, Number of Contracts			0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment			$ 0

FDIC Indemnification Asset (Gains and Losses Associated with Covered Assets) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Guarantor Obligations [Line Items]
Provision for loan losses	$ (12,583)	$ (1,200)	$ (8,995)	$ (3,147)	$ (5,174)	$ (37,854)	$ (13,619)	$ (12,100)	$ (25,925)	$ (68,747)	$ (50,911)
Income from resolution of covered assets, net									11,551	27,450	36,155
Gain on sale of loans, net									15,864	27,589	(4,406)
Covered [Member]
Guarantor Obligations [Line Items]
Provision for loan losses	(235)				(261)				(752)	(1,358)	1,681
Income from resolution of covered assets, net									11,551	27,450	36,155
Gain on sale of loans, net	$ 993				$ 0				5,732	17,406	(14,470)
Gains (Losses) on Sales of Covered OREO									(1,620)	(203)	(1,301)
Gain (Loss) Associated With Covered Assets									14,911	43,295	22,065
Covered [Member] \| Net Loss on FDIC Indemnification
Guarantor Obligations [Line Items]
Provision for loan losses									523	1,039	(1,472)
Income from resolution of covered assets, net									(9,332)	(21,912)	(28,946)
Gain on sale of loans, net									3,388	(1,514)	11,615
Gains (Losses) on Sales of Covered OREO									1,222	167	1,044
Gain (Loss) Associated With Covered Assets									(4,199)	(22,220)	(17,759)
Covered [Member] \| Net Impact on Pre-tax Earnings
Guarantor Obligations [Line Items]
Provision for loan losses									(229)	(319)	209
Income from resolution of covered assets, net									2,219	5,538	7,209
Gain on sale of loans, net									9,120	15,892	(2,855)
Gains (Losses) on Sales of Covered OREO									(398)	(36)	(257)
Gain (Loss) Associated With Covered Assets									$ 10,712	$ 21,075	$ 4,306

FDIC Indemnification Asset (Changes in the FDIC Indemnification Asset) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
FDIC Indemnification Asset [Roll Forward]
FDIC Indemnification Asset and Liability, net	$ 295,635	$ 515,910	$ 739,843
Amortization of FDIC indemnification asset	(261,763)	(176,466)	(160,091)
FDIC Indemnification Asset, Cash Payments Received	(29,673)	(21,589)	(46,083)
Net gain (loss) on FDIC indemnification	(4,199)	(22,220)	(17,759)
FDIC Indemnification Asset and Liability, net	$ 0	$ 295,635	$ 515,910

FDIC Indemnification Asset (Balance Sheet) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
FDIC Indemnification Asset [Abstract]
FDIC indemnification asset	$ 0	$ 295,635
FDIC Indemnification Asset and Liability, net	$ 0	$ 295,635	$ 515,910	$ 739,843

Equipment Under Operating Lease (Schedule of Equipment Under Operating Lease) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Leases [Abstract]
Property Subject to or Available for Operating Lease, Gross	$ 802,302	$ 674,434
Property Subject to or Available for Operating Lease, Accumulated Depreciation	(99,948)	(74,932)
Property Subject to or Available for Operating Lease, Net	702,354	599,502
Impairment of equipment under operating lease	$ 0	$ 0	$ 4,100

Equipment Under Operating Lease (Schedule of Future Minimum Rental Payments) (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Years Ending December 31:
Operating Leases, Future Minimum Payments Receivable, Current	$ 65,201
Operating Leases, Future Minimum Payments Receivable, in Two Years	59,512
Operating Leases, Future Minimum Payments Receivable, in Three Years	49,987
Operating Leases, Future Minimum Payments Receivable, in Four Years	43,482
Operating Leases, Future Minimum Payments Receivable, in Five Years	35,342
Operating Leases, Future Minimum Payments, Due Thereafter	100,170
Operating Leases, Future Minimum Payments Receivable	$ 353,694

Premises and Equipment and Lease Commitments (Summary of Premises and Equipment) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 207,389	$ 200,496
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(135,743)	(121,477)
Property, Plant and Equipment, Net	71,646	79,019
Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	18,793	18,793
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	69,651	70,298
Furniture, Fixtures And Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	36,581	35,675
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	22,218	21,078
Software and software licensing rights
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	47,653	42,908
Aircraft and automobiles
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	11,614	11,744
Capitalized implementation costs of CCA
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 879	$ 0

Premises and Equipment and Lease Commitments (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment, Type [Abstract]
Amount included buildings and improvements recorded under capital lease	$ 11.0	$ 11.0
Depreciation, Nonproduction	18.5	19.4	$ 21.3
Operating Leases, Rent Expense, Net	$ 26.0	$ 27.5	$ 27.6

Premises and Equipment and Lease Commitments (Schedule of Future Minimum Rentals Under Non-Cancelable Operating Leases) (Details) - Land and Building [Member] $ in Thousands	Dec. 31, 2018 USD ($)
Operating Leased Assets [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 21,207
Operating Leases, Future Minimum Payments, Due in Two Years	17,629
Operating Leases, Future Minimum Payments, Due in Three Years	15,858
Operating Leases, Future Minimum Payments, Due in Four Years	12,114
Operating Leases, Future Minimum Payments, Due in Five Years	10,311
Operating Leases, Future Minimum Payments, Due Thereafter	42,984
Operating Leases, Future Minimum Payments Due	$ 120,103

Deposits (Summary of Average Balances and Weighted Average Rates Paid on Deposits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Demand deposits:
Non-interest bearing, average balance	$ 3,389,191	$ 3,069,565	$ 2,968,192
Non-interest bearing, average rate (in Percent)	0.00%	0.00%	0.00%
Interest bearing, average balance	$ 1,627,828	$ 1,586,390	$ 1,382,717
Interest-bearing, average rate (in Percent)	1.13%	0.81%	0.60%
Money market, average balance	$ 10,350,772	$ 9,364,498	$ 7,946,447
Weighted Average Rate Domestic Deposit, Money Market	1.41%	0.85%	0.64%
Savings, average balance	$ 284,198	$ 365,603	$ 415,205
Weighted Average Rate Domestic Deposit, Savings	0.26%	0.21%	0.23%
Time, average balance	$ 6,617,006	$ 6,094,336	$ 5,326,630
Weighted Average Rate Domestic Deposit, Time Deposits	1.81%	1.27%	1.12%
Total, average balance	$ 22,268,995	$ 20,480,392	$ 18,039,191
Weighted Average Rate, Interest-bearing Domestic Deposits, Point in Time	1.28%	0.83%	0.66%

Deposits (Narrative) (Details) - USD ($) $ in Billions	Dec. 31, 2018	Dec. 31, 2017
Deposits [Abstract]
Time Deposits, $100,000 or More	$ 4.1
Time deposit accounts with balances of $250,000 or more	2.4	$ 2.3
Public funds deposits included in deposits	2.6
Interest-bearing Domestic Deposit, Brokered	2.5
Carrying value of investment securities available for sale pledged as security for public funds deposits	$ 1.3

Deposits (Schedule of Maturities of Time Deposits) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deposits [Abstract]
Time Deposit Maturities, Next Twelve Months	$ 5,119,279
Time Deposit Maturities, Year Two	1,533,117
Time Deposit Maturities, Year Three	94,973
Time Deposit Maturities, Year Four	22,316
Time Deposit Maturities, after Year Five	50,073
Time Deposits	$ 6,819,758	$ 6,334,842

Deposits (Schedule of Interest Expense on Deposits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deposits [Abstract]
Interest Expense, Demand Deposit Accounts	$ 18,391	$ 12,873	$ 8,343
Interest Expense, Money Market Deposits	145,585	79,645	50,802
Interest Expense, Savings Deposits	739	752	972
Interest Expense, Time Deposits	119,848	77,663	59,656
Interest Expense, Domestic Deposits	$ 284,563	$ 170,933	$ 119,773

Federal Home Loan Bank Advances and Other Borrowings (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)
Debt Instrument [Line Items]
Percent of outstanding FHLB Advances of which the sum of qualifying first mortgages, CRE loans, Home equity lines and credit and mortgage-backed securities pledged must equal (in Percent)	100.00%
Pledged Financial Instruments, Not Separately Reported, Securities for Federal Home Loan Bank	$ 10,200
Debt Instrument, Interest Rate, Effective Percentage	5.12%
Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds	$ 3,700
Federal Reserve Bank Advances [Member]
Debt Instrument [Line Items]
Unused borrowing capacity at FRB	410
Federal Funds Lines of Credit [Member]
Debt Instrument [Line Items]
Unused Borrowing Capacity - Fed Funds lines of credit	$ 85

Federal Home Loan Bank Advances and Other Borrowings (Schedule of Outstanding FHLB Advances) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Maturing in Next Twelve Months - One month or less	$ 2,325,000
Maturing in Next Twelve Months - One month or less, Weighted Average Rate (in Percent)	2.41%
Maturing in Next Twelve Months - Over one month	$ 1,821,000
Maturing in Next Twelve Months - Over one month, Weighted Average Rate (in Percent)	2.58%
Federal Home Loan Bank, Advances, Maturities Summary, Due in Year Two	$ 375,000
Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate, One to Two Years from Balance Sheet Date	2.49%
Federal Home Loan Bank, Advances, Maturities Summary, Due in Year Three	$ 275,000
Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate, Two to Three Years from Balance Sheet Date	2.89%
Advances from Federal Home Loan Banks	$ 4,796,000	$ 4,771,000
Minimum
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Maturing in Next Twelve Months - One month or less, range of interest rates (in Percent)	2.24%
Maturing in Next Twelve Months - Over one month, range of interest rates (in Percent)	1.46%
Maturing in Year Two, range of interest rates (in Percent)	1.67%
Maturing in Year Three, range of interest rates (in Percent)	2.73%
Maximum
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Maturing in Next Twelve Months - One month or less, range of interest rates (in Percent)	2.53%
Maturing in Next Twelve Months - Over one month, range of interest rates (in Percent)	2.76%
Maturing in Year Two, range of interest rates (in Percent)	2.91%
Maturing in Year Three, range of interest rates (in Percent)	3.02%

Federal Home Loan Bank Advances, Notes and Other Borrowings Long-Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Disclosure [Abstract]
Long-term Debt, Gross	$ 400,000	$ 400,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	4.875%
Debt Instrument, Unamortized Discount	$ 5,610	6,275
Long-term Debt	394,390	393,725
Capital Lease Obligations	8,359	9,105
Long-term Debt and Capital Lease Obligations	$ 402,749	$ 402,830

Income Taxes Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Current Federal Tax Expense (Benefit)									$ 2,172	$ (251,880)	$ 51,806
Current State and Local Tax Expense (Benefit)									20,834	(15,733)	27,708
Current Income Tax Expense (Benefit)									23,006	(267,613)	79,514
Deferred Federal Income Tax Expense (Benefit)									51,303	46,377	35,045
Deferred State and Local Income Tax Expense (Benefit)									16,475	11,424	(4,856)
Deferred income taxes									67,778	57,801	30,189
Provision (benefit) for income taxes	$ 16,717	$ 21,377	$ 27,094	$ 25,596	$ (298,872)	$ 32,252	$ 29,021	$ 27,787	$ 90,784	$ (209,812)	$ 109,703

Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount									$ 87,286	$ 141,561	$ 117,405
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent									21.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount									$ (18,923)	$ (29,511)	$ (23,215)
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent									(4.55%)	(7.30%)	(6.92%)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount									$ 31,182	$ 19,332	$ 15,894
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent									7.50%	4.78%	4.74%
Discrete Income Tax Benefit									$ 0	$ (327,945)	$ 0
Effective Income Tax Rate Reconciliation, Discrete Tax Benefit									0.00%	(81.08%)	0.00%
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount									$ (8,761)	$ (13,249)	$ (381)
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent									(2.11%)	(3.27%)	(0.12%)
Provision (benefit) for income taxes	$ 16,717	$ 21,377	$ 27,094	$ 25,596	$ (298,872)	$ 32,252	$ 29,021	$ 27,787	$ 90,784	$ (209,812)	$ 109,703
Effective Income Tax Rate Reconciliation, Percent									21.84%	(51.87%)	32.70%

Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Excess of tax basis over carrying value of acquired loans	$ 52,341	$ 66,395
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts	25,599	33,309
Deferred Tax Assets, Operating Loss Carryforwards	17,209	15,892
Deferred Tax Assets, Other	33,330	31,859
Deferred Tax Assets, Gross	128,479	147,455
Deferred tax liabilities:
Net unrealized gains on investment securities available for sale	1,757	24,657
Deferred Tax Liabilities, Leasing Arrangements	167,856	113,161
Deferred Tax Liabilities, Other	9,195	13,468
Deferred Tax Liabilities, Gross	178,808	151,286
Deferred Tax Liabilities, Net	$ (50,329)	$ (3,831)

Income Taxes (Schedule of Unrecognized Tax Benefits, Roll Forward) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized Tax Benefits	$ 116,081	$ 59,220	$ 72,736	$ 43,412
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions	2,399	1,882	2,713
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	77,101	1,661	25,168
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions	(26,037)	(15,316)	0
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	0	0	(200)
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	(675)	(2,229)	0
Unrecognized Tax Benefits, Period Increase (Decrease)	112,008	58,734	71,093
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	$ 4,073	$ 486	$ 1,643

Income Taxes Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	$ (3,700)
Amortization Method Qualified Affordable Housing Project Investments	64,094	$ 63,846
Qualified Affordable Housing Project Investments, Commitment	21,000	26,000
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	78,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	78,200	43,600	$ 45,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	6,500	3,200
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, net of tax	3,200	300	$ 1,100
State and Local Jurisdiction [Member]
Discrete Income Tax Benefit - Estimated Income Tax Refund		24,200
Operating Loss Carryforwards	108,800
Tax Credit Carryforward, Amount	10,900
Internal Revenue Service (IRS) [Member]
Discrete Income Tax Benefit - Estimated Income Tax Refund		295,000
Discrete Income Tax Benefit - Interest on Estimated Income Tax Refund		$ 8,700
Operating Loss Carryforwards	7,600
Maximum [Member] \| State and Local Jurisdiction [Member]
Decrease in Unrecognized Tax Benefits is Reasonably Possible	42,800
Minimum \| State and Local Jurisdiction [Member]
Decrease in Unrecognized Tax Benefits is Reasonably Possible	$ 0

Derivatives and Hedging Activities (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Discontinuation of cash flow hedge, notional amount	$ 0	$ 0
Financial collateral pledged for interest rate swaps	400,000
Fair value of Interest rate derivative contracts cleared through the CME	0
Amount expected to be reclassified from AOCI into income	(7,900,000)
Financial collateral pledged by counterparties to Company	(15,000,000)
Amounts reclassified from AOCI into earnings as a result of discontinuation of cash flow hedges or early extinguishment of debt	$ 0	$ 0

Derivatives and Hedging Activities (Interest Rate Contract Derivative Financial Instruments and Related Hedged Items) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Derivatives Fair Value [Line Items]
Notional amount of interest rate derivatives	$ 5,139,206	$ 4,392,790
Interest rate derivative assets, fair value	29,615	27,627
Interest rate derivative liabilities, fair value	$ (23,874)	$ (25,373)
Derivatives designated as cash flow hedges \| Pay-fixed interest rate swaps
Derivatives Fair Value [Line Items]
Weighted average fixed rate of interest rate derivatives (in Percent)	2.38%	1.77%
Weighted average remaining maturity of interest rate derivatives (in Duration)	4 years 18 days	4 years 3 months 23 days
Notional amount of interest rate derivatives	$ 2,846,000	$ 2,046,000
Derivatives designated as cash flow hedges \| Pay-fixed interest rate swaps \| Other Liabilities
Derivatives Fair Value [Line Items]
Interest rate derivative liabilities, fair value	0	0
Derivatives designated as cash flow hedges \| Pay-fixed interest rate swaps \| Other Assets
Derivatives Fair Value [Line Items]
Interest rate derivative assets, fair value	$ 3,405	$ 2,350
Derivatives not designated as hedges \| Pay-fixed interest rate swaps
Derivatives Fair Value [Line Items]
Weighted average fixed rate of interest rate derivatives (in Percent)	4.10%	3.87%
Weighted average remaining maturity of interest rate derivatives (in Duration)	5 years 11 months 14 days	6 years 4 months 19 days
Notional amount of interest rate derivatives	$ 1,048,196	$ 1,028,041
Derivatives not designated as hedges \| Pay-fixed interest rate swaps \| Other Liabilities
Derivatives Fair Value [Line Items]
Interest rate derivative liabilities, fair value	(6,991)	(13,173)
Derivatives not designated as hedges \| Pay-fixed interest rate swaps \| Other Assets
Derivatives Fair Value [Line Items]
Interest rate derivative assets, fair value	$ 14,883	$ 10,856
Derivatives not designated as hedges \| Pay-variable interest rate swaps
Derivatives Fair Value [Line Items]
Weighted average fixed rate of interest rate derivatives (in Percent)	4.10%	3.87%
Weighted average remaining maturity of interest rate derivatives (in Duration)	5 years 11 months 14 days	6 years 4 months 19 days
Notional amount of interest rate derivatives	$ 1,048,196	$ 1,028,041
Derivatives not designated as hedges \| Pay-variable interest rate swaps \| Other Liabilities
Derivatives Fair Value [Line Items]
Interest rate derivative liabilities, fair value	(16,874)	(12,189)
Derivatives not designated as hedges \| Pay-variable interest rate swaps \| Other Assets
Derivatives Fair Value [Line Items]
Interest rate derivative assets, fair value	$ 11,318	$ 14,410
Derivatives not designated as hedges \| Interest rate caps purchased, indexed to 1-month Libor [Domain]
Derivatives Fair Value [Line Items]
Weighted average fixed rate of interest rate derivatives (in Percent)	3.43%	2.81%
Weighted average remaining maturity of interest rate derivatives (in Duration)	1 year 2 months 2 days	1 year 3 months 29 days
Notional amount of interest rate derivatives	$ 98,407	$ 145,354
Derivatives not designated as hedges \| Interest rate caps purchased, indexed to 1-month Libor [Domain] \| Other Assets
Derivatives Fair Value [Line Items]
Interest rate derivative assets, fair value	$ 9	$ 11
Derivatives not designated as hedges \| Interest rate caps sold, indexed to 1-month Libor [Domain] [Domain]
Derivatives Fair Value [Line Items]
Weighted average fixed rate of interest rate derivatives (in Percent)	3.43%	2.81%
Weighted average remaining maturity of interest rate derivatives (in Duration)	1 year 2 months 2 days	1 year 3 months 29 days
Notional amount of interest rate derivatives	$ 98,407	$ 145,354
Derivatives not designated as hedges \| Interest rate caps sold, indexed to 1-month Libor [Domain] [Domain] \| Other Liabilities
Derivatives Fair Value [Line Items]
Interest rate derivative liabilities, fair value	$ (9)	$ (11)

Derivatives and Hedging Activities (Interest Rate Swaps Subject to Master Netting Agreements) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Gross Amounts Recognized, Derivative assets	$ 18,297	$ 13,217
Gross Amounts Recognized, Derivative liabilities	(6,991)	(13,173)
Gross Amounts Recognized, Derivative assets and liabilities	11,306	44
Gross Amounts Offset in Balance Sheet, Derivative assets	0	0
Gross Amounts Offset in Balance Sheet, Derivative liabilities	0	0
Gross Amounts Offset in Balance Sheet, Derivative assets and liabilities	0	0
Net Amounts Presented in Balance Sheet, Derivative assets	18,297	13,217
Net Amounts Presented in Balance Sheet, Derivative liabilities	(6,991)	(13,173)
Net Amounts Presented in Balance Sheet, Derivative assets and liabilities	11,306	44
Gross Amounts Not Offset in Balance Sheet
Derivative Instruments, Derivative assets	(5,264)	(7,996)
Derivative Instruments, Derivative liabilities	5,264	7,996
Derivative Instruments, Derivative assets and liabilities	0	0
Collateral Pledged, Derivative assets	(13,129)	(5,221)
Collateral Pledged, Derivative liabilities	436	4,962
Collateral Pledged, Derivative assets and liabilities	(12,693)	(259)
Net Amount, Derivative assets	(96)	0
Net Amount, Derivative liabilities	(1,291)	(215)
Net Amount, Derivative assets and liabilities	$ (1,387)	$ (215)

Derivatives and Hedging Activities Derivative and Hedging Activities - Amount of loss reclassified from AOCI into Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Document Fiscal Year Focus	2018
Borrowings [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion	$ 1,999
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion		$ (9,621)	$ (16,161)

Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	Jan. 23, 2019	Dec. 31, 2018
Class of Warrant or Right, Exercise Price of Warrants or Rights		$ 1,834,160.00
Subsequent Event [Member]
Stock Repurchase Program, Authorized Amount	$ 150,000

Stockholders' Equity (Changes in Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Unrealized gains on investment securities available for sale:
Net unrealized holding gain (loss) arising during the period, Before Tax	$ (77,607)	$ 49,131	$ 23,588
Amounts reclassified to gain on investment securities available for sale, net, Before Tax	(6,103)	(33,466)	(14,461)
Net change in unrealized gains on securities available for sale, Before Tax	(83,710)	15,665	9,127
Net unrealized holding gain (loss) arising during the period, Tax Effect	20,566	(19,407)	(9,317)
Amounts reclassified to gain on investment securities available for sale, net, Tax Effect	1,617	13,219	5,712
Net change in unrealized gains on securities available for sale, Tax Effect	22,183	(6,188)	(3,605)
Net unrealized holding gain (loss) arising during the period, Net of Tax	(57,041)	29,724	14,271
Amounts reclassified to gain on investment securities available for sale, net, Net of Tax	(4,486)	(20,247)	(8,749)
Net change in unrealized gain on securities available for sale	(61,527)	9,477	5,522
Unrealized losses on derivative instruments:
Net unrealized holding gain (loss) arising during the period, Before Tax	5,416	(2,577)	6,225
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	(1,999)	9,621	16,161
Net change in unrealized losses on derivative instruments, Before Tax	3,417	7,044	22,386
Net unrealized holding gain (loss) arising during the period, Tax Effect	(1,435)	1,018	(2,459)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	530	(3,800)	(6,384)
Net change in unrealized losses on derivative instruments, Tax Effect	(905)	(2,782)	(8,843)
Net unrealized holding gain (loss) arising during the period, Net of Tax	3,981	(1,559)	3,766
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	(1,469)	5,821	9,777
Net change in unrealized gains on derivative instruments	2,512	4,262	13,543
Other comprehensive income (loss), Before Tax	(80,293)	22,709	31,513
Other comprehensive income (loss), Tax Effect	21,278	(8,970)	(12,448)
Other comprehensive income (loss)	$ (59,015)	$ 13,739	$ 19,065

Stockholders' Equity (Categories of Other Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Other comprehensive income, Beginning Balance	$ 54,986	$ 41,247	$ 22,182
Other comprehensive income (loss)	(59,015)	13,739	19,065
Other comprehensive income, Ending Balance	4,873	54,986	41,247
Unrealized Gains on Investment Securities Available for Sale
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Other comprehensive income, Beginning Balance	56,534	47,057	41,535
Cumulative Effect of New Accounting Principle in Period of Adoption	9,187
Other comprehensive income (loss)	(61,527)	9,477	5,522
Other comprehensive income, Ending Balance	4,194	56,534	47,057
Unrealized Losses on Derivative Instruments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Other comprehensive income, Beginning Balance	(1,548)	(5,810)	(19,353)
Cumulative Effect of New Accounting Principle in Period of Adoption	(285)
Other comprehensive income (loss)	2,512	4,262	13,543
Other comprehensive income, Ending Balance	679	$ (1,548)	$ (5,810)
Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 8,902

Equity Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 4,600	$ 25,800	$ 900
Document Fiscal Year Focus	2018
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options	$ 1,100	$ 4,000	$ 300
Unvested and restricted share awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 26,500
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	1 year 8 months 11 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	683,137	621,806	651,760
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 40.06	$ 40.24	$ 31.00
Liability based awards settled in shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	77,050
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	52,026	47,848	97,852
RSU and PSU Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 3,900
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	1 year 9 months 12 days
Deferred Compensation Share-based Arrangements, Liability, Current and Noncurrent	$ 5,500
Incentive Compensation Arrangements [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 2,300
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	3 years 1 day
Deferred Compensation Share-based Arrangements, Liability, Current and Noncurrent	$ 800
2010 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	118,847
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	7,500,000
2014 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	2,061,087
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	4,000,000
Deferred Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of elective deferrals which vest immediately (in Percent)	100.00%
Percent of matching contributions which vest upon the earlier of a defined change in control or the participant's death, disability, attainment of normal retirement age, or the completion of two years of service (in Percent)	100.00%
Deferred Compensation Arrangement with Individual, Compensation Expense	$ 1,271	$ 1,500	$ 1,500
Deferred Compensation Plan [Member] \| Other Liabilities
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Liability, Current and Noncurrent	$ 24,000	21,000
401(k) Plan, First 1% Of Eligible Compensation [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement with Individual, Cash Awards Granted, Percentage	100.00%
401(k) Plan, 2% To 6% Of Eligible Compensation [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement with Individual, Cash Awards Granted, Percentage	70.00%
401(k) Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement with Individual, Contributions by Employer	$ 6,300	$ 5,500	$ 5,200

Equity Based Compensation (Schedule of Compensation Costs Related to Equity Based Awards) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 23,240	$ 22,792	$ 18,367
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	(5,783)	(8,576)	(6,899)
Allocated Share-based Compensation Expense, Net of Tax	17,457	14,216	11,468
Unvested and restricted share awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	19,415	18,087	16,885
RSU and PSU Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	3,027	3,416	1,482
Incentive Compensation Arrangements [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 798	$ 1,289	$ 0

Equity Based Compensation (Schedule of Nonvested Share Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Range of the closing price on date of grant, minimum (in Dollars per Share)	$ 33.44	$ 33.21	$ 29.78
Range of the closing price on date of grant, maximum (in Dollars per Share)	$ 42.80	$ 40.84	$ 33.76
Aggregate grant date fair value of shares vesting	$ 18,451	$ 17,514	$ 13,613
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	964,840	1,270,688	3,602,076	3,651,152
Unvested and restricted share awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	1,186,238	1,108,477	1,120,700	1,040,385
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 38.86	$ 36.06	$ 31.46	$ 31.86
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	683,137	621,806	651,760
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 40.06	$ 40.24	$ 31.00
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	(532,662)	(553,007)	(428,167)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	$ 34.64	$ 31.67	$ 31.79
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Forfeitures and Expirations	(72,714)	(81,022)	(143,278)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	$ 38.43	$ 34.51	$ 31.31

Equity Based Compensation Schedule of Other Share-Based Compensation, Activity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Unvested and restricted share awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 26.5
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	683,137	621,806	651,760
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	(532,662)	(553,007)	(428,167)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	1,186,238	1,108,477	1,120,700	1,040,385
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 38.86	$ 36.06	$ 31.46	$ 31.86
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	40.06	40.24	31.00
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	$ 34.64	$ 31.67	$ 31.79
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Forfeitures and Expirations	(72,714)	(81,022)	(143,278)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	$ 38.43	$ 34.51	$ 31.31
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	1 year 8 months 11 days
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	52,026	47,848	97,852
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	(52,585)	(35,238)	(19,291)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	90,612	91,171	78,561	0
Performance share units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	52,026	47,848	57,873
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	(57,873)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	99,874	105,721	57,873	0
RSU and PSU Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 3.9
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	1 year 9 months 12 days

Equity Based Compensation (Schedule of Stock Options Activity) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Number of Option Awards
Exercised (in Shares)	(291,689)	(2,331,388)	(47,979)
Weighted Average Exercise Price
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price	$ 26.49	$ 26.63	$ 16.50
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period	(14,159)		(1,097)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price	$ 11.14		$ 63.74
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 4.6	$ 25.8	$ 0.9
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	964,840	1,270,688	3,602,076	3,651,152
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 27.30	$ 26.93	$ 26.74	$ 26.62
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options	$ 1.1	$ 4.0	$ 0.3

Equity Based Compensation (Schedule of Options Outstanding and Exercisable, Additional Information) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options \| shares	964,840
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term	2 years 27 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value \| $	$ 3,358
Exercise Price Range 11.14 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options \| shares	3,910
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term	8 months 22 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value \| $	$ 74
Exercise Price Range 15.94-19.97 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options \| shares	29,145
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term	1 year 7 months 4 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value \| $	$ 357
Exercise Price Range 22.18-22.31 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options \| shares	40,917
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term	2 years 5 months 3 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value \| $	$ 314
Exercise Price 27.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options \| shares	888,908
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term	2 years 29 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value \| $	$ 2,613
Exercise Price 63.74 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options \| shares	1,960
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term	2 months 4 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value \| $	$ 0

Regulatory Requirements and Restrictions (Schedule of Compliance with Regulatory Capital Requirements Under Banking Regulations) (Details) $ / unit in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) $ / unit	Dec. 31, 2017 USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Document Fiscal Year Focus	2018
Parent Company [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier One Leverage Capital	$ 2,839,302	$ 2,892,069
Tier One Leverage Capital to Average Assets	8.99%	9.72%
Tier One Leverage Capital Required for Capital Adequacy	$ 1,263,725	$ 1,189,944
Tier One Leverage Capital Required for Capital Adequacy to Average Assets	4.00%	4.00%
Common Equity Tier One Risk Based Capital	$ 2,839,302	$ 2,892,069
Common Equity Tier One Risk Based Capital to Risk Weighted Assets	12.57%	13.11%
Common Equity Tier One Risk Based Capital Required to be Well Capitalized	$ 1,467,693	$ 1,434,193
Common Equity Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	6.50%	6.50%
Common Equity Tier One Risk Based Capital Required for Capital Adequacy	$ 1,016,095	$ 992,903
Common Equity Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	4.50%	4.50%
Tier One Risk Based Capital	$ 2,839,302	$ 2,892,069
Tier One Risk Based Capital to Risk Weighted Assets	12.57%	13.11%
Tier One Risk Based Capital Required to be Well Capitalized	$ 1,806,392	$ 1,765,161
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	8.00%	8.00%
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	$ 1,354,794	$ 1,323,871
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	6.00%	6.00%
Capital	$ 2,952,464	$ 3,041,004
Capital to Risk Weighted Assets	13.08%	13.78%
Capital Required to be Well Capitalized	$ 2,257,990	$ 2,206,451
Capital Required to be Well Capitalized to Risk Weighted Assets	10.00%	10.00%
Capital Required to be Well Capitalized to Risk Weighted Assets	$ 1,806,392	$ 1,765,161
Capital Required for Capital Adequacy to Risk Weighted Assets	8.00%	8.00%
Capital conservation buffer required for Common equity tier one \| $ / unit	1,580,593
Capital conservation buffer required for Common equity tier one ratio	7.00%
Capital conservation buffer required for tier one risk based \| $ / unit	1,919,291
Capital conservation buffer required for tier one risk based ratio	8.50%
Capital required under capital conservation buffer \| $ / unit	2,370,889
Capital required under capital conservation buffer ratio	10.50%
BankUnited [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier One Leverage Capital	$ 3,026,106	$ 3,107,920
Tier One Leverage Capital to Average Assets	9.60%	10.47%
Tier One Leverage Capital Required to be Well Capitalized	$ 1,575,712	$ 1,483,796
Tier One Leverage Capital Required to be Well Capitalized to Average Assets	5.00%	5.00%
Tier One Leverage Capital Required for Capital Adequacy	$ 1,260,569	$ 1,187,037
Tier One Leverage Capital Required for Capital Adequacy to Average Assets	4.00%	4.00%
Common Equity Tier One Risk Based Capital	$ 3,026,106	$ 3,107,920
Common Equity Tier One Risk Based Capital to Risk Weighted Assets	13.45%	14.13%
Common Equity Tier One Risk Based Capital Required to be Well Capitalized	$ 1,462,054	$ 1,429,999
Common Equity Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	6.50%	6.50%
Common Equity Tier One Risk Based Capital Required for Capital Adequacy	$ 1,012,191	$ 989,999
Common Equity Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	4.50%	4.50%
Tier One Risk Based Capital	$ 3,026,106	$ 3,107,920
Tier One Risk Based Capital to Risk Weighted Assets	13.45%	14.13%
Tier One Risk Based Capital Required to be Well Capitalized	$ 1,799,451	$ 1,759,999
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	8.00%	8.00%
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	$ 1,349,588	$ 1,319,999
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	6.00%	6.00%
Capital	$ 3,139,268	$ 3,255,221
Capital to Risk Weighted Assets	13.96%	14.80%
Capital Required to be Well Capitalized	$ 2,249,314	$ 2,199,999
Capital Required to be Well Capitalized to Risk Weighted Assets	10.00%	10.00%
Capital Required to be Well Capitalized to Risk Weighted Assets	$ 1,799,451	$ 1,759,999
Capital Required for Capital Adequacy to Risk Weighted Assets	8.00%	8.00%
Capital conservation buffer required for Common equity tier one	1,574,519
Capital conservation buffer required for Common equity tier one ratio	7.00%
Capital conservation buffer required for tier one risk based \| $ / unit	1,911,917
Capital conservation buffer required for tier one risk based ratio	8.50%
Capital required under capital conservation buffer \| $ / unit	2,361,779
Capital required under capital conservation buffer ratio	10.50%

Regulatory Requirements and Restrictions (Narrative) (Details) $ in Millions	Dec. 31, 2018 USD ($)
Banking and Thrift [Abstract]
Ratio that the FDIC indemnification asset and the covered assets are risk-weighted at (in Percent)	20.00%
FRB net reserve requirement	$ 148

Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Fair Value Inputs Assets Quantitative Information [Line Items]
Assets, fair value	$ 8,196,018	$ 6,739,196
Servicing Rights [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings	1,500	1,000	$ 1,800
Assets, fair value	9,525	30,737
Other debt securities
Fair Value Inputs Assets Quantitative Information [Line Items]
Assets, fair value	4,846	9,120
Private label residential mortgage-backed securities and CMOs
Fair Value Inputs Assets Quantitative Information [Line Items]
Assets, fair value	1,534,198	628,247
Fair Value, Inputs, Level 3
Fair Value Inputs Assets Quantitative Information [Line Items]
Assets, fair value	49,055	88,280
Fair Value, Inputs, Level 3 \| Servicing Rights [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Assets, fair value	9,525	30,737
Fair Value, Inputs, Level 3 \| Other debt securities
Fair Value Inputs Assets Quantitative Information [Line Items]
Assets, fair value	4,846	5,329
Fair Value, Inputs, Level 3 \| Private label residential mortgage-backed securities and CMOs
Fair Value Inputs Assets Quantitative Information [Line Items]
Assets, fair value	34,684	$ 52,214
Fair Value, Inputs, Level 3 \| Private label residential mortgage-backed securities and CMO's - Investment grade
Fair Value Inputs Assets Quantitative Information [Line Items]
Assets, fair value	$ 22,675
Fair Value, Inputs, Level 3 \| Private label residential mortgage-backed securities and CMO's - Investment grade \| Weighted Average
Fair Value Inputs Assets Quantitative Information [Line Items]
Current subordination level (in Percent)	12.80%
Fair Value, Inputs, Level 3 \| Private label residential mortgage-backed securities and CMO's - Non-investment grade
Fair Value Inputs Assets Quantitative Information [Line Items]
Assets, fair value	$ 12,009
Fair Value, Inputs, Level 3 \| Private label residential mortgage-backed securities and CMO's - Non-investment grade \| Weighted Average
Fair Value Inputs Assets Quantitative Information [Line Items]
Current subordination level (in Percent)	10.10%

Fair Value Measurements (Changes in the Fair Value of Assets and Liabilities Measured at Fair Value) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Private label residential mortgage-backed securities and CMOs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period, fair value of assets	$ 52,214	$ 120,610	$ 140,883
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	1,319	25,547	0
Gains (losses) for the period included in Other comprehensive income (loss)	(5,193)	(27,569)	(2,229)
Amortization	2,916	6,181	5,947
Sales	(5,120)	(45,524)
Settlements	(11,452)	(27,031)	(23,991)
Balance at end of period, fair value of assets	34,684	52,214	120,610
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) for assets held at end period	(3,724)	(3,345)	(2,229)
Other debt securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period, fair value of assets	5,329	4,572	4,532
Gains (losses) for the period included in Other comprehensive income (loss)	(289)	766	(9)
Amortization	809	280	116
Settlements	(1,003)	(289)	(67)
Balance at end of period, fair value of assets	4,846	5,329	4,572
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) for assets held at end period	(289)	766	(9)
Servicing Rights [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period, fair value of assets	30,737	27,159	20,017
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	761	(5,821)	(6,023)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	12,600	9,399	13,165
Sales	(34,573)
Balance at end of period, fair value of assets	$ 9,525	$ 30,737	$ 27,159

Fair Value Measurements (Valuation Techniques and Unobservable Inputs Used in the Valuation of Financial Instruments Falling within Level 3 of the Fair Value Hierarchy) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Fair Value Inputs Assets Quantitative Information [Line Items]
Total fair value of assets	$ 8,196,018	$ 6,739,196
Private label residential mortgage-backed securities and CMO's - Investment grade \| Discounted cash flow \| Minimum
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair Value Inputs, Prepayment Rate	4.30%
Probability rate of default	0.00%
Loss severity	15.00%
Fair Value Inputs, Discount Rate	2.35%
Private label residential mortgage-backed securities and CMO's - Investment grade \| Discounted cash flow \| Maximum [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair Value Inputs, Prepayment Rate	25.50%
Probability rate of default	5.85%
Loss severity	100.00%
Fair Value Inputs, Discount Rate	7.71%
Private label residential mortgage-backed securities and CMO's - Investment grade \| Discounted cash flow \| Weighted Average
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair Value Inputs, Prepayment Rate	12.28%
Probability rate of default	1.03%
Loss severity	18.84%
Fair Value Inputs, Discount Rate	2.95%
Private label residential mortgage-backed securities and CMO's - Non-investment grade \| Discounted cash flow \| Minimum
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair Value Inputs, Prepayment Rate	1.20%
Probability rate of default	0.00%
Loss severity	15.00%
Fair Value Inputs, Discount Rate	1.06%
Private label residential mortgage-backed securities and CMO's - Non-investment grade \| Discounted cash flow \| Maximum [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair Value Inputs, Prepayment Rate	25.00%
Probability rate of default	5.85%
Loss severity	76.60%
Fair Value Inputs, Discount Rate	9.95%
Private label residential mortgage-backed securities and CMO's - Non-investment grade \| Discounted cash flow \| Weighted Average
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair Value Inputs, Prepayment Rate	16.51%
Probability rate of default	2.31%
Loss severity	29.16%
Fair Value Inputs, Discount Rate	4.91%
Commercial Servicing Rights [Member] \| Discounted cash flow \| Minimum
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair Value Inputs, Prepayment Rate	2.82%
Fair Value Inputs, Discount Rate	4.84%
Commercial Servicing Rights [Member] \| Discounted cash flow \| Maximum [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair Value Inputs, Prepayment Rate	17.09%
Fair Value Inputs, Discount Rate	17.07%
Commercial Servicing Rights [Member] \| Discounted cash flow \| Weighted Average
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair Value Inputs, Prepayment Rate	12.34%
Fair Value Inputs, Discount Rate	13.33%
Fair Value, Inputs, Level 3
Fair Value Inputs Assets Quantitative Information [Line Items]
Total fair value of assets	$ 49,055	$ 88,280
Fair Value, Inputs, Level 3 \| Private label residential mortgage-backed securities and CMO's - Investment grade
Fair Value Inputs Assets Quantitative Information [Line Items]
Total fair value of assets	22,675
Fair Value, Inputs, Level 3 \| Private label residential mortgage-backed securities and CMO's - Non-investment grade
Fair Value Inputs Assets Quantitative Information [Line Items]
Total fair value of assets	12,009
Fair Value, Inputs, Level 3 \| Commercial Servicing Rights [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Total fair value of assets	$ 9,525

Fair Value Measurements (Assets for which Nonrecurring Changes in Fair Value have been Recorded) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
OREO and Repossessed Assets [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	$ 1,571	$ 5,790	$ 12,466
Losses from Nonrecurring Fair Value Changes	(1,864)	(2,078)	(1,156)
OREO and Repossessed Assets [Member] \| Fair Value, Inputs, Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	486	5,790	12,466
OREO and Repossessed Assets [Member] \| Fair Value, Inputs, Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	1,085	0
Impaired Loans [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	36,172	93,051	78,121
Losses from Nonrecurring Fair Value Changes	(6,816)	(65,716)	(25,573)
Impaired Loans [Member] \| Fair Value, Inputs, Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	35,397	93,051	78,121
Impaired Loans [Member] \| Fair Value, Inputs, Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	775	0
Equipment under operating lease
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring			8,173
Losses from Nonrecurring Fair Value Changes			(4,100)
Equipment under operating lease \| Fair Value, Inputs, Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring			8,173
Taxi medallion [Member] \| OREO and Repossessed Assets [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Losses from Nonrecurring Fair Value Changes	(1,000)	(1,300)	(200)
Taxi medallion [Member] \| OREO and Repossessed Assets [Member] \| Fair Value, Inputs, Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	1,100	2,100	2,500
Taxi medallion [Member] \| Impaired Loans [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Losses from Nonrecurring Fair Value Changes	(500)	(62,400)	(12,700)
Taxi medallion [Member] \| Impaired Loans [Member] \| Fair Value, Inputs, Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	$ 800	$ 86,000	$ 50,700

Fair Value Measurements (Carrying Value and Fair Value of Financial Instruments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Document Fiscal Year Focus	2018
Assets:
Investments, Fair Value Disclosure	$ 8,167,127	$ 6,690,832
Non-marketable equity securities	267,052	265,989
Loans and Leases Receivable, Net Amount	21,665,731	20,768,849
FDIC indemnification asset	0	295,635
Derivative assets	96	0
Liabilities:
Time Deposits	6,819,758	6,334,842
Federal Funds Purchased	175,000	0
Derivative liabilities	1,291	215
Fair Value, Inputs, Level 1
Assets:
Cash and cash equivalents	382,073	194,582
Fair Value, Inputs, Level 2
Assets:
Non-marketable equity securities	267,052	265,989
Loans held for sale	39,931	37,847
Derivative assets	29,615	27,627
Liabilities:
Demand, savings and money market deposits	16,654,465	15,543,637
Time Deposits	6,820,355	6,324,010
Federal Funds Purchased	175,000
FHLB advances	4,810,446	4,774,160
Notes Payable, Fair Value Disclosure	416,142	435,361
Derivative liabilities	23,874	25,373
Fair Value, Inputs, Level 3
Assets:
Loans and Leases Receivable, Net Reported Amount, Covered	207,813	922,888
Loans and Leases Receivable, Net Amount	21,660,445	20,759,567
FDIC indemnification asset	0	148,356
Carrying Value
Assets:
Cash and cash equivalents	382,073	194,582
Investments, Fair Value Disclosure	8,166,878	6,690,832
Non-marketable equity securities	267,052	265,989
Loans held for sale	36,992	34,097
Loans and Leases Receivable, Net Reported Amount, Covered	201,346	502,860
Loans and Leases Receivable, Net Amount	21,665,731	20,768,849
FDIC indemnification asset	0	295,635
Derivative assets	29,615	27,627
Liabilities:
Demand, savings and money market deposits	16,654,465	15,543,637
Time Deposits	6,819,758	6,334,842
Federal Funds Purchased	175,000
FHLB advances	4,796,000	4,771,000
Notes Payable, Fair Value Disclosure	402,749	402,830
Derivative liabilities	$ 23,874	$ 25,373

Commitments and Contingencies (Total Lending Related Commitments Outstanding) (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Lending Related Commitments [Line Items]
Unused Commitments to Extend Credit	$ 3,965,005
Commitments to fund loans
Lending Related Commitments [Line Items]
Unused Commitments to Extend Credit	508,074
Commitments to purchase loans
Lending Related Commitments [Line Items]
Unused Commitments to Extend Credit	518,054
Unfunded commitments under lines of credit [Member]
Lending Related Commitments [Line Items]
Unused Commitments to Extend Credit	2,853,431
Commercial and standby letters of credit
Lending Related Commitments [Line Items]
Unused Commitments to Extend Credit	$ 85,446

Condensed Financial Statements of BankUnited, Inc. (Schedule of Condensed Balance Sheet) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Assets:
Cash and cash equivalents	$ 382,073	$ 194,582	$ 448,313	$ 267,500
Investment securities available for sale, at fair value	8,096,359	6,680,832
Other assets	400,842	664,382
Total assets	32,164,326	30,346,986
Liabilities and Stockholders' Equity:
Liabilities	29,240,493	27,320,924
Stockholders' equity	2,923,833	3,026,062	2,418,429	2,243,898
Total liabilities and stockholders' equity	32,164,326	30,346,986
Parent Company [Member]
Assets:
Cash and cash equivalents	143,843	131,696	$ 87,718	$ 82,810
Investment securities available for sale, at fair value	60,519	63,543
Investment in subsidiaries	3,110,638	3,239,717
Deferred tax asset, net	10,088	9,456
Other assets	27,319	8,462
Total assets	3,352,407	3,452,874
Liabilities and Stockholders' Equity:
Notes Payable	394,390	393,725
Liabilities	34,184	33,087
Stockholders' equity	2,923,833	3,026,062
Total liabilities and stockholders' equity	$ 3,352,407	$ 3,452,874

Condensed Financial Statements of BankUnited, Inc. (Schedule of Condensed Statements of Income) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Condensed Income Statements, Captions [Line Items]
Interest Expense - Borrowings									$ 114,488	$ 83,256	$ 69,059
Employee compensation and benefits									254,997	237,824	223,011
Income before income taxes	$ 69,120	$ 118,705	$ 116,994	$ 110,831	$ 118,922	$ 100,031	$ 95,428	$ 90,080	415,650	404,461	335,444
Provision for income taxes	16,717	21,377	27,094	25,596	(298,872)	32,252	29,021	27,787	90,784	(209,812)	109,703
Net income	$ 52,403	$ 97,328	$ 89,900	$ 85,235	$ 417,794	$ 67,779	$ 66,407	$ 62,293	324,866	614,273	225,741
Parent Company [Member]
Condensed Income Statements, Captions [Line Items]
Interest and Dividend Income - Investment securities									3,532	3,580	4,280
Service fees from subsidiaries									21,000	18,787	21,957
Equity in earnings of subsidiaries									349,937	639,250	242,874
Other Income									(2,805)	0	0
Total Income									371,664	661,617	269,111
Interest Expense - Borrowings									20,165	20,132	20,100
Employee compensation and benefits									28,477	27,032	27,143
Other expense									5,617	5,047	4,466
Total expense									54,259	52,211	51,709
Income before income taxes									317,405	609,406	217,402
Provision for income taxes									(7,461)	(4,867)	(8,339)
Net income									$ 324,866	$ 614,273	$ 225,741

Condensed Financial Statements of BankUnited, Inc. (Schedule of Condensed Statements of Cash Flows) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net income	$ 52,403	$ 97,328	$ 89,900	$ 85,235	$ 417,794	$ 67,779	$ 66,407	$ 62,293	$ 324,866	$ 614,273	$ 225,741
Adjustments to reconcile net income to net cash provided by operating activities:
Equity based compensation									23,137	22,692	18,032
Net cash provided by operating activities									824,252	318,626	308,510
Cash flows from investing activities:
Purchase of investment securities available for sale									(4,138,994)	(3,131,798)	(3,058,106)
Proceeds from repayments and calls of investment securities									1,533,951	1,260,444	724,666
Other									(3,184)	(15,572)	21,123
Net cash used in investing activities									(2,041,531)	(2,452,576)	(3,826,231)
Cash flows from financing activities:
Dividends paid									(91,305)	(91,628)	(89,824)
Exercise of stock options									7,727	62,095	791
Other									(7,424)	(8,837)	5,178
Net cash provided by financing activities									1,404,770	1,880,219	3,698,534
Net increase (decrease) in cash and cash equivalents									187,491	(253,731)	180,813
Cash and cash equivalents, beginning of period				194,582				448,313	194,582	448,313	267,500
Cash and cash equivalents, end of period	382,073				194,582				382,073	194,582	448,313
Supplemental schedule of non-cash investing and financing activities:
Dividends declared, not paid									21,673	23,055	22,510
Parent Company [Member]
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net income									324,866	614,273	225,741
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed earnings of subsidiaries									70,064	(519,250)	(157,374)
Equity based compensation									23,137	22,692	18,032
Increase (Decrease) in Other Operating Assets and Liabilities, Net									(15,654)	3,343	7,438
Net cash provided by operating activities									402,413	121,058	93,837
Cash flows from investing activities:
Capital contributions to subsidiary									0	55,000	0
Purchase of investment securities available for sale									0	0	(20,150)
Proceeds from repayments and calls of investment securities									0	15,000	19,401
Other									(156)	(250)	(3)
Net cash used in investing activities									(156)	(40,250)	(752)
Cash flows from financing activities:
Proceeds from Issuance of Long-term Debt									(91,305)	(91,628)	(89,824)
Dividends paid									7,727	62,095	791
Exercise of stock options									(299,972)	0	0
Other									(6,560)	(7,297)	856
Net cash provided by financing activities									(390,110)	(36,830)	(88,177)
Net increase (decrease) in cash and cash equivalents									12,147	43,978	4,908
Cash and cash equivalents, beginning of period				$ 131,696				$ 87,718	131,696	87,718	82,810
Cash and cash equivalents, end of period	$ 143,843				$ 131,696				143,843	131,696	87,718
Supplemental schedule of non-cash investing and financing activities:
Dividends declared, not paid									$ 21,673	$ 23,055	$ 22,510

Condensed Financial Statements of BankUnited, Inc. (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash Dividends Paid to Parent Company by Consolidated Subsidiaries	$ (420)	$ (120)	$ (86)

Quarterly Financial Information (Unaudited) (Schedule of Quarterly Financial Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Interest and Dividend Income, Operating	$ 414,796	$ 357,717	$ 348,855	$ 327,776	$ 312,645	$ 309,443	$ 298,835	$ 283,538	$ 1,449,144	$ 1,204,461	$ 1,059,217
Interest Expense	119,743	105,749	93,592	79,967	73,819	68,179	59,246	52,945	399,051	254,189	188,832
Interest Income (Expense), Net	295,053	251,968	255,263	247,809	238,826	241,264	239,589	230,593	1,050,093	950,272	870,385
Provision for loan losses	12,583	1,200	8,995	3,147	5,174	37,854	13,619	12,100	25,925	68,747	50,911
Interest Income (Expense), after Provision for Loan Loss	282,470	250,768	246,268	244,662	233,652	203,410	225,970	218,493	1,024,168	881,525	819,474
Noninterest Income	33,328	38,735	31,973	27,986	46,541	53,326	29,893	28,144	132,022	157,904	106,417
Noninterest Expense	246,678	170,798	161,247	161,817	161,271	156,705	160,435	156,557	740,540	634,968	590,447
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	69,120	118,705	116,994	110,831	118,922	100,031	95,428	90,080	415,650	404,461	335,444
Provision for income taxes	16,717	21,377	27,094	25,596	(298,872)	32,252	29,021	27,787	90,784	(209,812)	109,703
Net income	$ 52,403	$ 97,328	$ 89,900	$ 85,235	$ 417,794	$ 67,779	$ 66,407	$ 62,293	$ 324,866	$ 614,273	$ 225,741
Earnings Per Share, Basic	$ 0.50	$ 0.90	$ 0.82	$ 0.78	$ 3.80	$ 0.62	$ 0.60	$ 0.57	$ 3.01	$ 5.60	$ 2.11
Earnings Per Share, Diluted	$ 0.50	$ 0.90	$ 0.82	$ 0.77	$ 3.79	$ 0.62	$ 0.60	$ 0.57	$ 2.99	$ 5.58	$ 2.09
Discrete Income Tax Benefit									$ 0	$ 327,945	$ 0

Loans and Allowance for Loan and Lease Losses (Schedule of Credit Exposure for Non-Covered Loans Based on Original LTV and FICO Score) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	$ 21,775,632	$ 20,913,386
Non-Covered [Domain] \| 1-4 single family residential
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	4,463,544	4,145,879
Non-Covered [Domain] \| FICO, 720 or less \| 1-4 single family residential
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	400,665	358,156
Non-Covered [Domain] \| FICO, 721 to 740 \| 1-4 single family residential
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	471,241	434,177
Non-Covered [Domain] \| FICO, 741 to 760 \| 1-4 single family residential
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	779,057	685,670
Non-Covered [Domain] \| FICO, 761 or greater \| 1-4 single family residential
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	2,812,581	2,667,876
60% or less \| Non-Covered [Domain] \| 1-4 single family residential
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	1,241,125	1,210,171
60% or less \| Non-Covered [Domain] \| FICO, 720 or less \| 1-4 single family residential
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	105,812	91,965
60% or less \| Non-Covered [Domain] \| FICO, 721 to 740 \| 1-4 single family residential
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	123,877	117,318
60% or less \| Non-Covered [Domain] \| FICO, 741 to 760 \| 1-4 single family residential
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	197,492	185,096
60% or less \| Non-Covered [Domain] \| FICO, 761 or greater \| 1-4 single family residential
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	813,944	815,792
60% - 70% \| Non-Covered [Domain] \| 1-4 single family residential
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	998,379	942,287
60% - 70% \| Non-Covered [Domain] \| FICO, 720 or less \| 1-4 single family residential
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	120,982	100,866
60% - 70% \| Non-Covered [Domain] \| FICO, 721 to 740 \| 1-4 single family residential
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	109,207	103,387
60% - 70% \| Non-Covered [Domain] \| FICO, 741 to 760 \| 1-4 single family residential
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	170,531	147,541
60% - 70% \| Non-Covered [Domain] \| FICO, 761 or greater \| 1-4 single family residential
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	597,659	590,493
70% - 80% \| Non-Covered [Domain] \| 1-4 single family residential
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	1,998,442	1,797,059
70% - 80% \| Non-Covered [Domain] \| FICO, 720 or less \| 1-4 single family residential
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	156,519	149,209
70% - 80% \| Non-Covered [Domain] \| FICO, 721 to 740 \| 1-4 single family residential
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	203,121	183,064
70% - 80% \| Non-Covered [Domain] \| FICO, 741 to 760 \| 1-4 single family residential
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	374,311	324,884
70% - 80% \| Non-Covered [Domain] \| FICO, 761 or greater \| 1-4 single family residential
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	1,264,491	1,139,902
More than 80% \| Non-Covered [Domain] \| 1-4 single family residential
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	225,598	196,362
More than 80% \| Non-Covered [Domain] \| FICO, 720 or less \| 1-4 single family residential
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	17,352	16,116
More than 80% \| Non-Covered [Domain] \| FICO, 721 to 740 \| 1-4 single family residential
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	35,036	30,408
More than 80% \| Non-Covered [Domain] \| FICO, 741 to 760 \| 1-4 single family residential
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	36,723	28,149
More than 80% \| Non-Covered [Domain] \| FICO, 761 or greater \| 1-4 single family residential
Financing Receivable, Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	$ 136,487	$ 121,689

Loans and Allowance for Loan and Lease Losses (Schedule of Commercial Credit Exposure Based on Internal Risk Ratings) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	$ 21,775,632	$ 20,913,386
Multi-family
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	2,585,421	3,218,953
Multi-family \| Pass
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	2,547,835	3,124,819
Multi-family \| Special mention
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	2,932	34,837
Multi-family \| Substandard
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	34,654	59,297
Multi-family \| Doubtful
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	0	0
Commercial real estate, Non-owner occupied
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	4,688,880	4,474,801
Commercial real estate, Non-owner occupied \| Pass
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	4,611,029	4,360,827
Commercial real estate, Non-owner occupied \| Special mention
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	16,516	33,094
Commercial real estate, Non-owner occupied \| Substandard
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	61,335	80,880
Commercial real estate, Non-owner occupied \| Doubtful
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	0	0
Construction and land
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	226,840	310,484
Construction and land \| Pass
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	216,917	305,043
Construction and land \| Special mention
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	0	0
Construction and land \| Substandard
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	9,923	5,441
Construction and land \| Doubtful
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	0	0
Commercial real estate, Owner occupied
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	2,119,880	2,012,742
Commercial real estate, Owner occupied \| Pass
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	2,077,611	1,954,464
Commercial real estate, Owner occupied \| Special mention
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	13,368	22,161
Commercial real estate, Owner occupied \| Substandard
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	28,901	33,145
Commercial real estate, Owner occupied \| Doubtful
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	0	2,972
Taxi medallion [Member]
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	775	106,067
Taxi medallion [Member] \| Pass
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	0	0
Taxi medallion [Member] \| Special mention
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	0	0
Taxi medallion [Member] \| Substandard
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	775	104,682
Taxi medallion [Member] \| Doubtful
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	0	1,385
Other Commercial and industrial [Member]
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	4,789,425	4,031,760
Other Commercial and industrial [Member] \| Pass
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	4,706,666	3,965,241
Other Commercial and industrial [Member] \| Special mention
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	38,097	37,591
Other Commercial and industrial [Member] \| Substandard
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	42,916	27,010
Other Commercial and industrial [Member] \| Doubtful
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	1,746	1,918
Pinnacle Public Finance [Member]
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	1,462,655	1,524,622
Pinnacle Public Finance [Member] \| Pass
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	1,462,655	1,524,622
Pinnacle Public Finance [Member] \| Special mention
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	0	0
Pinnacle Public Finance [Member] \| Substandard
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	0	0
Pinnacle Public Finance [Member] \| Doubtful
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	0	0
Bridge Funding Group [Member]
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	1,154,143	1,037,877
Bridge Funding Group [Member] \| Pass
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	1,105,821	954,376
Bridge Funding Group [Member] \| Special mention
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	10,157	55,551
Bridge Funding Group [Member] \| Substandard
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	31,522	27,950
Bridge Funding Group [Member] \| Doubtful
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	6,643	0
Commercial
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	17,028,019	16,717,306
Commercial \| Pass
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	16,728,534	16,189,392
Commercial \| Special mention
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	81,070	183,234
Commercial \| Substandard
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	210,026	338,405
Commercial \| Doubtful
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	$ 8,389	$ 6,275