BankUnited (BKU) 10-K 26 Feb 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
	Dec. 31, 2014	Feb. 24, 2015	Jun. 30, 2014
Document and Entity Information [Abstract]
Entity Registrant Name	BankUnited, Inc.
Entity Central Index Key	1504008
Current Fiscal Year End Date	-19
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Amendment Flag	FALSE
Entity Common Stock Shares Outstanding		102,182,306
Entity Public Float			$3,320,080,057
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No

CONSOLIDATED_BALANCE_SHEETS

CONSOLIDATED BALANCE SHEETS (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Cash and due from banks:
Non-interest bearing	$46,268	$45,976
Interest bearing	33,979	14,590
Interest bearing deposits at Federal Reserve Bank	100,596	190,075
Federal funds sold	6,674	2,108
Cash and cash equivalents	187,517	252,749
Investment securities available for sale, at fair value (including covered securities of $205,769 at December 31, 2013)	4,585,694	3,637,124
Investment securities held to maturity	10,000	0
Non-marketable equity securities	191,674	152,066
Loans held for sale	1,399	194
Loans (including covered loans of $1,043,864 and $1,483,888)	12,414,769	9,053,609
Allowance for loan and lease losses	-95,542	-69,725
Loans, net	12,319,227	8,983,884
FDIC indemnification asset	974,704	1,205,117
Bank owned life insurance	215,065	206,759
Equipment under operating lease, net	314,558	196,483
Other real estate owned (including covered OREO of $13,645 and $39,672)	13,780	40,570
Deferred tax asset, net	117,215	70,626
Goodwill and other intangible assets	68,414	69,067
Other assets	211,282	232,010
Total assets	19,210,529	15,046,649
Demand deposits:
Non-interest bearing	2,714,127	2,171,335
Interest bearing	899,696	676,079
Savings and money market	5,896,007	4,402,987
Time	4,001,925	3,282,027
Total deposits	13,511,755	10,532,428
Federal Home Loan Bank advances and other borrowings	3,318,559	2,414,313
Other liabilities	327,681	171,210
Total liabilities	17,157,995	13,117,951
Commitments and contingencies
Stockholders' equity:
Common stock, par value $0.01 per share, 400,000,000 shares authorized; 101,656,702 and 101,013,014 shares issued and outstanding	1,017	1,010
Paid-in capital	1,353,538	1,334,945
Retained earnings	651,627	535,263
Accumulated other comprehensive income	46,352	57,480
Total stockholders' equity	2,052,534	1,928,698
Total liabilities and stockholders' equity	$19,210,529	$15,046,649

CONSOLIDATED_BALANCE_SHEETS_Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
ASSETS
Covered investment securities available for sale	$0	$205,769
Covered loans	1,043,864	1,483,888
Covered OREO	$13,645	$39,672
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)	101,656,702	101,013,014
Common stock, shares outstanding (in Shares)	101,656,702	101,013,014

CONSOLIDATED_STATEMENTS_OF_INC

CONSOLIDATED STATEMENTS OF INCOME (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest income:
Loans	$667,237	$618,944	$584,727
Investment securities	108,662	114,535	131,198
Other	7,845	5,342	4,931
Total interest income	783,744	738,821	720,856
Interest expense:
Deposits	72,961	60,566	66,178
Borrowings	33,690	32,045	57,091
Total interest expense	106,651	92,611	123,269
Net interest income before provision for loan losses	677,093	646,210	597,587
Provision for (recovery of) loan losses (including $(243), $(1,738) and $(503) for covered loans)	41,505	31,964	18,896
Net interest income after provision for loan losses	635,588	614,246	578,691
Non-interest income:
Income from resolution of covered assets, net	49,082	78,862	51,016
Net loss on FDIC indemnification	-46,396	-50,638	-6,030
FDIC reimbursement of costs of resolution of covered assets	4,440	9,397	19,569
Service charges and fees	16,612	14,255	12,716
Gain (loss) on sale of loans, net (including gain (loss) related to covered loans of $20,369, $(16,195), and $(29,270))	21,047	-15,469	-28,657
Gain on investment securities available for sale, net (including loss related to covered securities of $(963) for the year ended December 31, 2013)	3,859	8,629	17,039
Loss on extinguishment of debt	0	0	-14,175
Loss on termination of interest rate swap	0	0	-8,701
Operating Leases, Income Statement, Lease Revenue	21,601	8,214	791
Other non-interest income	13,920	14,799	30,373
Total non-interest income	84,165	68,049	73,941
Non-interest expense:
Employee compensation and benefits	195,218	173,763	173,261
Occupancy and equipment	70,520	63,766	54,465
Amortization (accretion) of FDIC indemnification asset	69,470	36,943	-15,306
(Gain) loss on other real estate owned, net (including (gain) loss related to covered OREO of $(2,744), $(7,629), and $5,762)	-2,617	-7,629	5,762
Foreclosure and other real estate owned expense	4,976	10,442	20,268
Deposit insurance expense	9,348	7,648	7,248
Professional fees	13,178	21,934	15,468
Telecommunications and data processing	13,381	13,034	12,462
Other non-interest expense	53,029	44,392	34,139
Total non-interest expense	426,503	364,293	307,767
Income before income taxes	293,250	318,002	344,865
Provision for income taxes	89,035	109,066	133,605
Net income	204,215	208,936	211,260
Preferred stock dividends	0	0	3,899
Net income available to common stockholders	$204,215	$208,936	$207,361
Earnings per common share, basic (in Dollars per Share)	$1.95	$2.03	$2.05
Earnings per common share, diluted (in Dollars per Share)	$1.95	$2.01	$2.05
Cash dividends declared per common share (in Dollars per Share)	$0.84	$0.84	$0.72

CONSOLIDATED_STATEMENTS_OF_INC1

CONSOLIDATED STATEMENTS OF INCOME (Parenthetical) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Provision (recovery of) for covered loans	($243)	($1,738)	($503)
Non-interest income:
Gain (loss) on sale of covered loans	20,369	-16,195	-29,270
Loss on investment securities available for sale, covered		-963
Non-interest expense:
(Gain) loss on covered OREO, net	($2,744)	($7,629)	$5,762

CONSOLIDATED_STATEMENTS_OF_COM

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net income	$204,215	$208,936	$211,260
Unrealized gains on investment securities available for sale:
Net unrealized holding gain (loss) arising during the period	1,939	-39,546	68,893
Reclassification adjustment for net securities gains realized in income	-2,370	-5,300	-10,466
Net change in unrealized gains on securities available for sale	-431	-44,846	58,427
Unrealized losses on derivative instruments:
Net unrealized holding gain (loss) arising during the period	-27,080	4,942	-8,848
Reclassification adjustment for net losses realized in income	16,383	13,408	16,378
Net change in unrealized losses on derivative instruments	-10,697	18,350	7,530
Other comprehensive income (loss)	-11,128	-26,496	65,957
Comprehensive income	$193,087	$182,440	$277,217

CONSOLIDATED_STATEMENTS_OF_CAS

CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$204,215	$208,936	$211,260
Adjustments to reconcile net income to net cash used in operating activities:
Amortization and accretion, net	-258,433	-373,988	-476,185
Provision for loan losses	41,505	31,964	18,896
Income from resolution of covered assets, net	-49,082	-78,862	-51,016
Net loss on FDIC indemnification	46,396	50,638	6,030
(Gain) loss on sale of loans, net	-21,047	15,469	28,657
Increase in cash surrender value of bank owned life insurance	-3,009	-2,472	-3,532
Gain on investment securities available for sale, net	-3,859	-8,629	-17,039
Loss on extinguishment of debt	0	0	14,175
(Gain) loss on other real estate owned	-2,617	-7,629	5,762
Equity based compensation	15,551	13,936	23,204
Depreciation and amortization	31,552	23,184	15,056
Deferred income taxes	-39,577	8,237	-72,228
Proceeds from sale of loans held for sale	22,387	36,752	42,920
Loans originated for sale, net of repayments	-23,088	-34,091	-39,735
Realized tax benefits from dividend equivalents and equity based compensation	-2,123	-2,795	-1,612
Gain on acquisition	0	0	-5,288
Other:
(Increase) decrease in other assets	-32,709	-4,324	3,100
Increase (decrease) in other liabilities	24,192	56,567	-54,031
Net cash used in operating activities	-49,746	-67,107	-351,606
Cash flows from investing activities:
Purchase of investment securities	-1,549,649	-1,095,477	-1,300,485
Proceeds from repayments of investment securities available for sale	362,552	680,780	659,044
Proceeds from sale of investment securities available for sale	355,798	874,876	835,745
Maturities and calls of investment securities available for sale	0	5,751	78,623
Purchase of non-marketable equity securities	-82,800	-40,137	-45,389
Proceeds from redemption of non-marketable equity securities	43,192	21,131	61,670
Purchases of loans	-955,995	-1,141,808	-709,388
Loan originations, repayments and resolutions, net	-2,617,273	-2,067,791	-204,530
Proceeds from sale of loans, net	624,362	116,611	103,796
Decrease in FDIC indemnification asset for claims filed	114,916	164,872	600,857
Purchase of premises and equipment, net	-24,012	-22,079	-31,958
Acquisition of equipment under operating lease	-126,834	-162,009	-39,154
Proceeds from sale of other real estate owned	55,971	111,165	193,255
Other investing activities	-8,035	-52,869	-1,086
Net cash provided by (used in) investing activities	-3,807,807	-2,606,984	201,000
Cash flows from financing activities:
Net increase in deposits	2,979,340	1,994,404	738,332
Additions to Federal Home Loan Bank advances and other borrowings	4,100,000	2,625,000	2,612,969
Repayments of Federal Home Loan Bank advances and other borrowings	-3,206,933	-2,137,882	-2,923,607
Dividends paid	-87,716	-65,225	-89,021
Realized tax benefits from dividend equivalents and equity based compensation	2,123	2,795	1,612
Exercise of stock options	926	9,905	3,597
Other financing activities	4,581	2,490	-1,665
Net cash provided by financing activities	3,792,321	2,431,487	342,217
Net increase (decrease) in cash and cash equivalents	-65,232	-242,604	191,611
Cash and cash equivalents, beginning of period	252,749	495,353	303,742
Cash and cash equivalents, end of period	187,517	252,749	495,353
Supplemental disclosure of cash flow information:
Interest paid	105,386	93,735	143,161
Income taxes paid	129,987	97,631	257,960
Supplemental schedule of non-cash investing and financing activities:
Transfers from loans to other real estate owned	26,564	68,084	151,302
Transfers from loans held for sale to portfolio	0		4,023
Assets received in satisfaction of loans	0	0	4,772
Disbursement of loan proceeds from escrow	52,500	0
Dividends declared, not paid	21,968	21,833
Equity consideration issued in business combination	0	0	39,861
Unsettled securities trades	124,767	0
Acquisition of assets under capital lease	$9,035	$1,820

CONSOLIDATED_STATEMENTS_OF_STO

CONSOLIDATED STATEMENTS OF STOCKHOLDERSb EQUITY (USD $)	Total	Common Stock	Preferred Stock	Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income
In Thousands, except Share data, unless otherwise specified
Balance at Dec. 31, 2011	$1,535,280	$977	$0	$1,240,068	$276,216	$18,019
Balance (in Shares) at Dec. 31, 2011		97,700,829	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	277,217				211,260	65,957
Conversion of preferred shares to common shares (in Shares)		-5,415,794	5,415,794
Conversion of preferred shares to common shares		-54	54
Equity consideration issued in business combination (in Shares)		1,676,060
Equity consideration issued in business combination	39,861	17		39,844
Dividends	-74,091				-74,091
Equity based compensation (in Shares)		885,143
Equity based compensation	23,204	8		23,196
Forfeiture of unvested shares (in Shares)		-90,629
Forfeiture of unvested shares	0	-1		1
Exercise of stock options (in Shares)	251,120	251,120
Exercise of stock options	3,597	3		3,594
Tax benefits from dividend equivalents and equity based compensation	1,612			1,612
Balance at Dec. 31, 2012	1,806,680	950	54	1,308,315	413,385	83,976
Balance (in Shares) at Dec. 31, 2012		95,006,729	5,415,794
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	182,440				208,936	-26,496
Conversion of preferred shares to common shares (in Shares)		5,415,794	-5,415,794
Conversion of preferred shares to common shares		54	-54
Equity consideration issued in business combination	0
Dividends	-87,058				-87,058
Equity based compensation (in Shares)		109,585
Equity based compensation	13,936	1		13,935
Forfeiture of unvested shares (in Shares)		-58,682
Exercise of stock options (in Shares)	539,588	539,588
Exercise of stock options	9,905	5		9,900
Tax benefits from dividend equivalents and equity based compensation	2,795			2,795
Balance at Dec. 31, 2013	1,928,698	1,010	0	1,334,945	535,263	57,480
Balance (in Shares) at Dec. 31, 2013		101,013,014	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	193,087				204,215	-11,128
Equity consideration issued in business combination	0
Dividends	-87,851				-87,851
Equity based compensation (in Shares)		699,529
Equity based compensation	15,551	7		15,544
Forfeiture of unvested shares (in Shares)		-111,264
Forfeiture of unvested shares		-1		1
Exercise of stock options (in Shares)	55,423	55,423
Exercise of stock options	926	1		925
Tax benefits from dividend equivalents and equity based compensation	2,123			2,123
Balance at Dec. 31, 2014	$2,052,534	$1,017		$1,353,538	$651,627	$46,352
Balance (in Shares) at Dec. 31, 2014		101,656,702

Basis_of_Presentation_and_Summ

Basis of Presentation and Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation and Summary of Significant Accounting Policies	Basis of Presentation and Summary of Significant Accounting Policies
	BankUnited, Inc. ("BankUnited, Inc." or "BKU"), is a national bank holding company with one wholly-owned subsidiary, BankUnited, National Association ("BankUnited" or the "Bank"), 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 through 100 branches located in 15 Florida counties and 6 banking centers located in the New York metropolitan area at December 31, 2014.
	On May 21, 2009, BankUnited acquired substantially all of the assets and assumed all of the non-brokered deposits and substantially all of the other liabilities of BankUnited, FSB from the Federal Deposit Insurance Corporation ("FDIC") in a transaction referred to as the "FSB Acquisition." Neither the Company nor the Bank had any substantive operations prior to May 21, 2009. In connection with the FSB Acquisition, BankUnited entered into two loss sharing agreements with the FDIC (the "Loss Sharing Agreements"). The Loss Sharing Agreements consist of a single family shared-loss agreement (the "Single Family Shared-Loss Agreement"), and a commercial and other loans shared-loss agreement, (the "Commercial Shared-Loss Agreement"). The Single Family Shared-Loss Agreement provides for FDIC loss sharing and the Bank’s reimbursement for recoveries to the FDIC through May 21, 2019 for single family residential loans and other real estate owned ("OREO"). Loss sharing under the Commercial Shared-Loss Agreement terminated on May 21, 2014. The Commercial Shared-Loss Agreement continues to provide for the Bank’s reimbursement of recoveries to the FDIC through May 21, 2017 for all other covered assets, including commercial real estate, commercial and industrial and consumer loans, certain investment securities and commercial OREO. Gains realized on the sale of formerly covered investment securities are included in recoveries subject to reimbursement. The assets covered under the Loss Sharing Agreements are collectively referred to as the “covered assets.” Pursuant to the terms of the Loss Sharing Agreements, the covered assets are subject to a stated loss threshold whereby the FDIC will reimburse 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 U.S. generally accepted accounting principles ("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 allowance for loan and lease losses ("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. Management has used information provided by third party valuation specialists to assist in the determination of the fair values of investment securities.
	Significant estimates were also made in the determination of the fair values of assets acquired and liabilities assumed in the FSB Acquisition, the most significant of which related to loans acquired with evidence of deterioration in credit quality since origination, the FDIC indemnification asset and certain investment securities.
	Principles of Consolidation
	The consolidated financial statements include the accounts of BankUnited, Inc., its wholly-owned subsidiary and BankUnited Investment Services, Inc. ("BUIS"). BUIS was a Florida insurance agency providing wealth management and financial planning services. The operations of BUIS were discontinued in May 2013 and were not significant to the consolidated results of operations or financial position of the Company for any period presented. All significant intercompany balances and transactions have been eliminated in consolidation.
	Fair Value Measurements
	Certain of the Company's assets and liabilities are reflected in the financial statements at fair value on either a recurring or non-recurring basis. Investment securities available for sale 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, loans held for sale, goodwill, mortgage servicing rights ("MSRs") and assets acquired and liabilities assumed in business combinations. These non-recurring fair value measurements typically involve the application of acquisition accounting, 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.
	Transfers between levels of the fair value hierarchy are recorded as of the end of the reporting period.
	Cash and Cash Equivalents
	Cash and cash equivalents include cash and due from banks, both interest bearing and non-interest bearing, amounts on deposit at the Federal Reserve Bank and federal funds sold. Cash equivalents have original maturities of three months or less.
	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 and marketable equity securities 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 accumulated other comprehensive income ("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 or 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. 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 other-than-temporary impairment ("OTTI") on a quarterly basis or more frequently if events and circumstances indicate that a potential impairment may have occurred. 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. 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. 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.
	The evaluation of OTTI of marketable equity securities focuses on whether evidence supports recovery of the unrealized loss within a timeframe consistent with temporary impairment. The entire amount by which cost basis exceeds the fair value of an equity security that is considered to be other-than-temporarily impaired is recognized in earnings.
	Federal Reserve Bank Stock
	The Bank, as a member of the Federal Reserve Bank ("FRB") system, is required to maintain an investment in the stock of the FRB. No market exists for this stock, and the investment can be liquidated only through redemption by the FRB, at the discretion of and subject to conditions imposed by the FRB. The stock has no readily determinable fair value and is carried at cost.
	Federal Home Loan Bank Stock
	The Bank, as a member of the Federal Home Loan Bank ("FHLB") system, is required to maintain an investment in the stock of the FHLB. No market exists for this stock, and the investment can be liquidated only through redemption by the FHLB, at the discretion of and subject to conditions imposed by the FHLB. The stock has no readily determinable fair value and is carried at cost. Historically, FHLB 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
	Mortgage loans originated with the intent to sell in the secondary market are carried at the lower of cost or fair value, determined in the aggregate. These loans are generally sold on a non-recourse basis. Loans were generally sold with servicing released prior to March 31, 2014 and generally sold with servicing retained subsequent to that date. Gains and losses on the sale of loans recognized in earnings are measured based on the difference between proceeds received, including the value of retained servicing, and the carrying amount of the loans, inclusive of deferred origination fees and costs, if any.
	Loans not originated for sale in the secondary market and not 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, home equity loans and lines of credit, multi-family, owner and non-owner occupied commercial real estate, construction and land, commercial and industrial and consumer loans and direct financing leases. A portion of the Company's loan portfolio consists of loans acquired from the FDIC in the FSB Acquisition, the substantial majority of which are covered under the Loss Sharing Agreements. Loans covered under the Loss Sharing Agreements are referred to as covered loans. The Company segregates its loan portfolio between covered and non-covered loans. Non-covered loans include those originated or purchased since the FSB Acquisition ("new loans") and loans acquired in the FSB Acquisition for which loss share coverage has terminated. Loans acquired in the FSB Acquisition are further segregated between those acquired with evidence of deterioration in credit quality since origination (Acquired Credit Impaired or "ACI" loans) and those acquired without evidence of deterioration in credit quality since origination ("non-ACI" loans).
	New Loans
	New loans are those originated or purchased by the Company since the FSB Acquisition. New loans are carried at the unpaid principal balance ("UPB"), net of premiums, discounts, unearned income, deferred loan origination fees and costs, and the ALLL.
	Interest income on new 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 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 the time of the FSB Acquisition, measured as the present value of all cash flows expected to be received, discounted at an appropriately risk-weighted 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 adjustable rate mortgages ("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 a significant 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 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.
	Non-ACI Loans
Loans acquired 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
New commercial 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. New and non-ACI residential and consumer 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. 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. When a residential or consumer loan is returned to accrual status, interest accrued at the date the loan was placed on non-accrual status along with interest foregone during the non-accrual period are recognized as interest income. 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
New and non-ACI 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 $750,000 that have internal risk ratings of substandard or doubtful and are on non-accrual status are individually evaluated for impairment. 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 troubled-debt restructuring ("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 has no history of missed payments for six months prior to the restructuring. If the borrower performs pursuant to the modified loan terms for at least six months and the remaining loan balance is considered collectible, the loan is returned to accrual status. 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 losses inherent in the loan portfolio at the balance sheet date. The ALLL relates to (i) new loans, (ii) estimated additional losses arising on non-ACI loans subsequent to the FSB Acquisition and (iii) impairment recognized as a result of decreases in expected cash flows on ACI loans due to further credit deterioration since acquisition. 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 new open- and closed-end loans secured by residential real estate and 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. 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.
New and Non-ACI Loans
The new residential and home equity portfolio segments have not yet developed an observable loss trend. Due to several factors, there is a lack of similarity between the risk characteristics of new loans and covered loans in the residential and home equity portfolios. Those factors include elimination of wholesale origination channels, elimination of Alt-A and no document loans, enhancements to real estate appraisal policies, elimination of option ARMs and tightening of underwriting policies. Therefore, management does not believe it is appropriate to use the historical performance of the covered residential loans as a basis for calculating the ALLL applicable to the new loans. The ALLL for new 1-4 single family residential loans is based on average annual loss rates on prime residential mortgage securitizations issued between 2003 and 2008. Loans included in these securitizations have credit characteristics, such as loan-to-value ("LTV") and FICO scores, considered by management to be comparable to characteristics of loans in the new 1-4 single family residential portfolio. The ALLL for new home equity loans is based on peer group average historical loss rates as described further below.
Calculated loss frequency and severity percentages are applied to the UPB of non-ACI 1-4 single family residential mortgages and home equity loans and lines of credit to calculate the ALLL. Based on an analysis of historical portfolio performance, OREO and short sale data and other internal and external factors, management has concluded that historical performance by portfolio class is the best indicator of incurred loss for the non-ACI 1-4 single family residential and home equity portfolio classes. For each of these portfolio classes, a quarterly roll rate matrix is used to measure the rate at which loans move from one delinquency bucket to the next during a given quarter. An average four quarter roll rate matrix is used to estimate the amount within each delinquency bucket expected to roll to 120+ days delinquent. Loss severity given default is estimated based on internal data about short sales and OREO sales for the most recent twelve months. The ALLL calculation incorporates a 100% loss severity assumption for home equity loans and lines of credit projected to roll to 120 days delinquency.
The credit quality of loans in the residential portfolio segment may be impacted by fluctuations in home values, unemployment, general economic conditions, borrowers' financial circumstances and fluctuations in interest rates.
The new commercial loan portfolio has limited delinquency history and has not exhibited an observable loss trend. The credit quality of loans in this portfolio segment is impacted by general economic conditions and other factors that may influence debt service coverage generated by the borrowers' businesses as well as fluctuations in the value of real estate and other collateral. For loans evaluated individually for impairment and determined to be impaired, a specific allowance is established based on the present value of expected cash flows discounted at the loan's effective interest rate, the estimated fair value of the loan, or for collateral dependent loans, the estimated fair value of collateral less costs to sell. Loans not individually determined to be impaired are grouped based on common risk characteristics. The ALLL for these portfolio segments is based primarily on peer group average historical loss rates and the Bank's internal credit risk rating system, using a four quarter loss emergence period and a twelve quarter loss experience period. The ALLL for municipal loans and lease receivables is based on a cumulative municipal default curve for obligations of credit quality comparable to those in the Company's portfolio, using a twelve quarter loss emergence period.
The peer group used to calculate average annual historical net charge-off rates that form the basis for the Bank's general reserves for new commercial, home equity and consumer loans is a group of 34 banks made up of the banks included in the OCC Midsize Bank Group and two additional banks in the New York region that management believes to be comparable based on size and nature of lending operations.
Qualitative adjustments are made to the ALLL when, based on management's judgment and experience, there are internal or external factors impacting incurred losses not taken into account by the quantitative calculations. Management has categorized potential qualitative adjustments into the following categories:
•	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;
•	Economic factors, including unemployment rates and GDP growth rates;
•	Changes in the value of underlying collateral for loans secured by real estate;
•	Quality of risk ratings, as measured by changes in risk rating identified by our independent loan review function;
•	Credit concentrations;
•	Changes in 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 requirements.
Revisions to ALLL inputs
Management revised the source or determination of inputs to the ALLL methodology in 2014, as follows:
•	The peer group used in calculating annual historical net charge-off rates used in determining general reserves for the majority of the new commercial, home equity and consumer portfolio segments was changed. Prior to 2014, a peer group of banks in the Southeast region of the U.S. was used for loans originated in the Florida market and a peer group of banks in the U.S. New York region was used for loans originated in the New York market. Management determined there was no longer a sufficient number of banks in the regional peer sets comparable to BankUnited in size and nature of lending operations.
•	The loss experience period used to calculate average historical net charge-off rates was extended from eight to twelve quarters to include sufficient history and better capture a range of observations reflecting the performance of loans originated in the current economic cycle.
ACI Loans
A specific valuation allowance related to an ACI loan or pool is established when quarterly evaluations of expected cash flows indicate it is probable that the Company will be unable to collect all of the cash flows expected at acquisition plus any additional cash flows expected to be collected arising from changes in estimate after acquisition. The amount of any necessary valuation allowance is measured by comparing the carrying value of the loan or pool to the updated net present value of expected cash flows for the loan or pool. In calculating the present value of expected cash flows for this purpose, changes in cash flows related to credit related factors are isolated from those related to changes in interest rate indices or prepayment assumptions. Alternatively, an improvement in the expected cash flows related to ACI loans results in a reduction of any previously established specific allowance with a corresponding credit to the provision for loan losses. A charge-off is taken for an individual ACI commercial loan when it is deemed probable that the loan will be resolved for an amount less than its carrying value.
Expected cash flows are estimated on a pool basis for ACI 1-4 single family residential and home equity loans. The analysis of expected pool cash flows incorporates updated pool level expected prepayment rate, default rate, delinquency level and loss severity given default assumptions. Prepayment, delinquency and default curves are derived primarily from roll rates generated from the historical performance of the portfolio over the immediately preceding four quarters. Loss severity given default is also generated from the historical performance of the portfolio over the immediately preceding four quarters. Estimates of default probability also incorporate updated LTV ratios, at the loan level, based on Case-Shiller Home Price Indices for the relevant Metropolitan Statistical Area ("MSA"). Costs and fees represent an additional component of loss on default and are projected using the "Making Home Affordable" cost factors provided by the Federal government.
The primary assumptions underlying estimates of expected cash flows for commercial ACI loans are default probability and severity of loss given default. Generally, updated cash flow assumptions are based primarily on net realizable value analyses prepared at the individual loan level. These analyses incorporate information about loan performance, collateral values, the financial condition of the borrower and other available information that may impact sources of repayment.
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 new 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, consisting of loans, OREO and certain investment securities acquired from the FDIC. 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 transferrable 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, covered investment securities 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."
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.
Other Real Estate Owned
OREO consists of real estate assets acquired through, or in lieu of, loan foreclosure. 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 foreclosure, periodic valuations are performed and the assets are carried at the lower of the carrying amount at the date of foreclosure 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 foreclosed properties are expensed as incurred.
Goodwill and Other Intangible Assets
Goodwill of $67 million at December 31, 2014 and 2013 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 of goodwill over its implied 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.
Intangible assets with determinable lives include core deposit intangible assets and other customer relationship intangible assets. These assets are amortized over their estimated useful lives using the straight-line method, or for certain core deposit intangible assets using an accelerated method based on an exponential attrition curve. Intangible assets with determinable lives are evaluated for impairment when events or changes in circumstances indicate the carrying amount of the assets may not be recoverable.
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 impairment is the amount by which the carrying amount exceeds the fair value of the asset. Fair value is based upon discounted cash flow analysis and available market data.
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. 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 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;
•	computer equipment - 3 to 5 years; and
•	software and software licensing rights - 3 to 5 years.
Mortgage Servicing Rights
The Company may acquire MSRs through purchases or retention of servicing in connection with sales of originated loans in the secondary market. All newly acquired MSRs are initially measured at fair value. MSRs are subsequently measured using the amortization method. MSRs are amortized in proportion to and over the period of estimated net servicing revenue. Amortization is adjusted prospectively in response to changes in estimated future cash flows.
MSRs are periodically evaluated for impairment based on a comparison of the amortized balance to fair value. For purposes of impairment evaluation and measurement, MSRs are stratified based on predominant risk characteristics such as product type, interest rate and term. If, by individual stratum, the carrying amount of MSRs exceeds fair value, a valuation allowance is established. The valuation allowance is subsequently adjusted to reflect changes in the measurement of impairment.
MSRs are included in other assets in the accompanying consolidated balance sheets. Servicing fee income is recorded net of amortization of MSRs in other non-interest income. Neither the MSR asset nor related income have had a material impact on the Company's financial statements to date.
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 in the provision for income taxes.
Equity Based Compensation
The Company periodically grants nonqualified stock options or unvested or restricted shares of common stock to key employees. 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. Compensation cost related to awards that embody performance conditions is recognized if it is probable that the performance condition will be achieved.
The fair value of unvested shares is based on the closing market price of the Company's common stock at the date of grant. The value of shares granted with post-vesting restrictions as to transferability is reduced by a discount for lack of marketability. The fair value of stock options is estimated at the date of grant using a Black-Scholes option pricing model. This model requires assumptions as to expected volatility, expected term, dividend yield, and risk free interest rates. Since the Company's common stock has limited trading history, the measurement of expected volatility incorporates the volatility of the common stock of peer companies. The expected term represents the period of time that options are expected to be outstanding from the grant date and is based on the contractual term of the options and employees' anticipated exercise behavior. The risk free interest rate is based on the U.S. Treasury constant maturity rate corresponding to the expected term of the options at the date of grant. The expected dividend yield is determined based on historical dividend rates and dividends expected to be declared in the foreseeable future.
Derivative Financial Instruments and Hedging Activities
Interest rate swap agreements
Interest rate swaps are contracts in which a series of interest cash flows are exchanged over a prescribed period. Interest rate swaps 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 effective portion of the gain or loss on 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 ineffective portion of the gain or loss on the derivative instruments, if any, is recognized currently in earnings. Hedge effectiveness is assessed using the hypothetical derivative method. Assessments of hedge effectiveness and measurements of hedge ineffectiveness are performed quarterly.
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 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 swaps not designated as, or not qualifying as, hedging instruments are recognized currently in earnings.
Derivative loan commitments
Interest rate lock commitments to originate mortgage loans to be held for sale upon funding are derivative instruments and are recognized in the consolidated balance sheets at fair value with changes in fair value reflected in earnings.
Forward loan sale commitments
Mandatory delivery forward loan sale commitments and best efforts forward loan sale commitments for which the loan to the underlying borrower has closed are derivative instruments and are reflected in the consolidated balance sheets at fair value with changes in fair value reflected 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 and stock option awards with non-forfeitable rights to dividends or dividend equivalents, whether paid or unpaid, and participating preferred stock 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 and by the dilutive effect of convertible preferred stock using the if-converted 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.
Reclassifications
Certain amounts presented for prior periods have been reclassified to conform to the current period presentation.
Recent Accounting Pronouncements
In 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2014-04, Receivables—Troubled Debt Restructurings by Creditors and ASU 2014-14, Receivables-Troubled Debt Restructurings by Creditors (Subtopic 310-40) . The amendments in ASU 2014-04 clarify that an in substance repossession or foreclosure occurs, and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan, upon either (1) the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure or (2) the borrower conveying all interest in the residential real estate property to the creditor to satisfy the loan through a deed in lieu of foreclosure or other similar legal agreement. In addition, entities are required to disclose the recorded investment in residential mortgage loans for which formal foreclosure proceedings are in process. The amendments in ASU 2014-14 require that a mortgage loan be derecognized and that a separate receivable be recognized upon foreclosure if the loan has a government guarantee that is not separable from the loan before foreclosure and certain other conditions are met. The amendments in these updates are effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2014, with early adoption permitted. The Company intends to adopt these updates prospectively effective January 1, 2015. Management does not expect adoption will have a material impact on the Company's consolidated financial position, results of operations or cash flows.
In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606), which will supersede 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, including leases and insurance 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. The amendments also require expanded disclosures concerning the nature, amount, timing and uncertainty of revenues and cash flows arising from contracts with customers. For public entities, the amendments in this update are effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period, and must be applied retrospectively. Early application is not permitted. Management is currently evaluating the impact of adoption.

Earnings_Per_Common_Share

Earnings Per Common Share	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Earnings Per Common Share	Earnings Per Common Share
	The computation of basic and diluted earnings per common share is presented below for the years ended December 31, 2014, 2013 and 2012 (in thousands, except share and per share data):
	c	2014			2013				2012
	Basic earnings per common share:
	Numerator:
	Net income	$	204,215		$	208,936			$	211,260
	Preferred stock dividends	—			—				(3,899		)
	Net income available to common stockholders	204,215			208,936				207,361
	Distributed and undistributed earnings allocated to participating securities	(7,991		)	(9,380		)		(15,081		)
	Income allocated to common stockholders for basic earnings per common share	$	196,224		$	199,556			$	192,280
	Denominator:
	Weighted average common shares outstanding	101,574,076			99,587,970				94,791,484
	Less average unvested stock awards	(1,117,869		)	(1,093,930		)		(1,137,210		)
	Weighted average shares for basic earnings per common share	100,456,207			98,494,040				93,654,274
	Basic earnings per common share	$	1.95		$	2.03			$	2.05
	Diluted earnings per common share:
	Numerator:
	Income allocated to common stockholders for basic earnings per common share	$	196,224		$	199,556			$	192,280
	Adjustment for earnings reallocated from participating securities	16			1,265				20
	Income used in calculating diluted earnings per common share	$	196,240		$	200,821			$	192,300
	Denominator:
	Weighted average shares for basic earnings per common share	100,456,207			98,494,040				93,654,274
	Dilutive effect of stock options and preferred shares	139,606			1,257,565				174,509
	Weighted average shares for diluted earnings per common share	100,595,813			99,751,605				93,828,783
	Diluted earnings per common share	$	1.95		$	2.01			$	2.05
	The following potentially dilutive securities were outstanding at December 31, 2014, 2013 and 2012, but excluded from the calculation of diluted earnings per common share for the years then ended because their inclusion would have been anti-dilutive:
			2014		2013			2012
	Unvested shares		881,693		752,609			1,248,707
	Stock options and warrants		6,386,424		6,386,815			6,950,735
	Convertible preferred shares		—		—			5,415,794

Acquisition_Activity

Acquisition Activity	12 Months Ended
	Dec. 31, 2014
Business Combinations [Abstract]
Acquisition Activity	Acquisition Activity
	On February 29, 2012, BKU completed the acquisition of Herald National Bank ("Herald") for a purchase price of $65 million consisting of cash of $25 million, 1,676,060 shares of common stock valued at $39 million and stock options and warrants valued at $1 million. The acquisition of Herald was determined to be a business combination and was accounted for using the acquisition method of accounting; accordingly, the assets acquired and liabilities assumed were recorded at their estimated fair values at the acquisition date.
	The estimated fair values of assets acquired and liabilities assumed totaled $508 million and $438 million, respectively, resulting in the recognition of a gain of $5.3 million on the acquisition of 100% of Herald, representing the excess of the fair value of net assets acquired over the value of consideration issued. Pursuant to the terms of the merger agreement between BKU and Herald, the determination of the final purchase price was dependent on the price of BKU's common stock for the ten trading days preceding the merger. A decline in the stock price between the execution of the agreement and consummation of the acquisition led to this gain, which is included in the consolidated statement of income line item "other non-interest income" for the year ended December 31, 2012.

Investment_Securities

Investment Securities	12 Months Ended
	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities
	Investment securities available for sale at December 31, 2014 and 2013 consisted of the following (in thousands):
		2014
		Amortized Cost			Gross Unrealized						Fair Value
					Gains			Losses
	U.S. Treasury securities	$	54,924		$	43		$	—		$	54,967
	U.S. Government agency and sponsored enterprise residential mortgage-backed securities	1,501,504			29,613			(6,401		)	1,524,716
	U.S. Government agency and sponsored enterprise commercial mortgage-backed securities	101,089			769			—			101,858
	Resecuritized real estate mortgage investment conduits (“Re-Remics”)	179,664			3,613			(5		)	183,272
	Private label residential mortgage-backed securities and collateralized mortgage obligations ("CMOs")	350,300			54,222			(543		)	403,979
	Private label commercial mortgage-backed securities	1,134,854			9,470			(4,935		)	1,139,389
	Single family rental real estate-backed securities	446,079			468			(3,530		)	443,017
	Collateralized loan obligations	174,767			—			(435		)	174,332
	Non-mortgage asset-backed securities	117,562			4,608			(6		)	122,164
	Mutual funds and preferred stocks	96,294			9,148			—			105,442
	State and municipal obligations	15,317			385			—			15,702
	Small Business Administration securities	298,424			10,540			(236		)	308,728
	Other debt securities	3,712			4,416			—			8,128
		$	4,474,490		$	127,295		$	(16,091	)	$	4,585,694
		2013
		Covered Securities												Non-Covered Securities
		Amortized Cost			Gross Unrealized						Fair Value			Amortized Cost		Gross Unrealized						Fair Value
					Gains			Losses								Gains			Losses
	U.S. Government agency and sponsored enterprise residential mortgage-backed securities	$	—		$	—		$	—		$	—		$	1,548,671	$	34,191		$	(8,559	)	$	1,574,303
	U.S. Government agency and sponsored enterprise commercial mortgage-backed securities	—			—			—			—			27,132		—			(355		)	26,777
	Re-Remics	—			—			—			—			267,525		4,261			(1		)	271,785
	Private label residential mortgage-backed securities and CMOs	119,434			56,539			(110		)	175,863			135,750		329			(1,824		)	134,255
	Private label commercial mortgage-backed securities	—			—			—			—			814,114		7,638			(12,980		)	808,772
	Non-mortgage asset-backed securities	—			—			—			—			172,329		6,676			(11		)	178,994
	Mutual funds and preferred stocks	15,419			6,726			—			22,145			125,387		4,015			(1,870		)	127,532
	Small Business Administration securities	—			—			—			—			295,892		13,045			—			308,937
	Other debt securities	3,542			4,219			—			7,761			—		—			—			—
		$	138,395		$	67,484		$	(110	)	$	205,769		$	3,386,800	$	70,155		$	(25,600	)	$	3,431,355
	As discussed in Note 1, FDIC loss sharing on covered investment securities ended on May 21, 2014. Investment securities formerly covered under the Commercial Shared-Loss Agreement had an aggregate fair value of $168 million, amortized cost of $108 million and gross unrealized gains of $60 million as of December 31, 2014.
	Investment securities held to maturity at December 31, 2014 consisted of one State of Israel bond with a carrying value of $10 million. Fair value approximated carrying value at December 31, 2014. The bond matures in 2024.
	At December 31, 2014, 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	$	510,919		$	529,197
	Due after one year through five years	2,576,280			2,620,431
	Due after five years through ten years	1,028,754			1,050,596
	Due after ten years	262,243			280,028
	Mutual funds and preferred stocks with no stated maturity	96,294			105,442
		$	4,474,490		$	4,585,694
	Based on the Company’s proprietary assumptions, the estimated weighted average life of the investment portfolio as of December 31, 2014 was 4.1 years. The effective duration of the investment portfolio as of December 31, 2014 was 1.7 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, securities sold under agreements to repurchase and to secure borrowing capacity at the FRB totaled $1.0 billion at December 31, 2014 and $0.9 billion at December 31, 2013.
	The following table provides information about gains and losses on investment securities available for sale for the years ended December 31, 2014, 2013 and 2012 (in thousands):
		2014			2013			2012
	Proceeds from sale of investment securities available for sale	$	355,798		$	874,876		$	835,745
	Gross realized gains	$	4,987		$	11,119		$	17,338
	Gross realized losses	(1,128		)	(1,527		)	(299		)
	Net realized gain	3,859			9,592			17,039
	OTTI	—			(963		)	—
	Gain on investment securities available for sale, net	$	3,859		$	8,629		$	17,039
	During the year ended December 31, 2013, OTTI was recognized on an intermediate term mortgage mutual fund.  Due primarily to the length of time the investment had been in a continuous unrealized loss position and an increasing measure of impairment, the Company determined the impairment to be other than temporary.  This security was covered under the Commercial Shared-Loss Agreement; therefore, the impact of the impairment was significantly mitigated by an increase of $770 thousand in the FDIC indemnification asset, reflected in the consolidated statement of income line item “Net loss on FDIC indemnification.”
	The following tables present the aggregate fair value and the aggregate amount by which amortized cost exceeded fair value for investment securities in unrealized loss positions at December 31, 2014 and 2013, aggregated by investment category and length of time that individual securities had been in continuous unrealized loss positions (in thousands):
		2014
		Less than 12 Months						12 Months or Greater						Total
		Fair Value			Unrealized Losses			Fair Value			Unrealized Losses			Fair Value		Unrealized Losses
	U.S. Government agency and sponsored enterprise residential mortgage-backed securities	$	7,058		$	(34	)	$	300,057		$	(6,367	)	$	307,115	$	(6,401	)
	Re-Remics	—			—			335			(5		)	335		(5		)
	Private label residential mortgage-backed securities and CMOs	60,076			(189		)	14,653			(354		)	74,729		(543		)
	Private label commercial mortgage-backed securities	103,900			(1,150		)	239,456			(3,785		)	343,356		(4,935		)
	Single family rental real estate-backed securities	233,012			(3,530		)	—			—			233,012		(3,530		)
	Collateralized loan obligations	49,565			(435		)	—			—			49,565		(435		)
Non-mortgage asset-backed securities	2,796			(6		)	—			—			2,796		(6		)
Small Business Administration securities	49,851			(236		)	—			—			49,851		(236		)
	$	506,258		$	(5,580	)	$	554,501		$	(10,511	)	$	1,060,759	$	(16,091	)
	2013
	Less than 12 Months						12 Months or Greater						Total
	Fair Value			Unrealized Losses			Fair Value			Unrealized Losses			Fair Value		Unrealized Losses
U.S. Government agency and sponsored enterprise residential mortgage-backed securities	$	414,361		$	(8,559	)	$	—		$	—		$	414,361	$	(8,559	)
U.S. Government agency and sponsored enterprise commercial mortgage-backed securities	26,777			(355		)	—			—			26,777		(355		)
Re-Remics	11,037			(1		)	—			—			11,037		(1		)
Private label residential mortgage-backed securities and CMOs	79,048			(1,696		)	10,303			(238		)	89,351		(1,934		)
Private label commercial mortgage-backed securities	511,778			(12,980		)	—			—			511,778		(12,980		)
Non-mortgage asset-backed securities	1,516			(11		)	—			—			1,516		(11		)
Mutual funds and preferred stocks	67,513			(1,870		)	—			—			67,513		(1,870		)
	$	1,112,030		$	(25,472	)	$	10,303		$	(238	)	$	1,122,333	$	(25,710	)
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, 2014 and 2012. As discussed above, one security was determined to be other-than-temporarily impaired during the year ended December 31, 2013.  The Company does not intend to sell securities that are in significant unrealized loss positions 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, 2014, 42 securities were in unrealized loss positions. Unrealized losses on investment securities available for sale at December 31, 2014 were primarily attributable to an increase in medium and long-term market interest rates subsequent to the date the securities were acquired. The amount of impairment related to seven of these securities was considered insignificant, totaling approximately $53 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 mortgage-backed securities:
At December 31, 2014, eight U.S. Government agency and sponsored enterprise residential mortgage-backed securities were in unrealized loss positions. The amount of impairment of each of the individual securities was 5% or less of amortized cost.  The timely payment of principal and interest on these securities is explicitly or implicitly guaranteed by the U.S. Government. Given the limited severity of impairment and the expectation of timely payment of principal and interest, the impairments were considered to be temporary.
Private label residential mortgage-backed securities and CMOs:
At December 31, 2014, four private label residential mortgage-backed securities were in unrealized loss positions.  These securities were assessed for OTTI using third-party developed credit and prepayment behavioral models and 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 that would result in the Company recovering less than its amortized cost basis related to any of these securities as of December 31, 2014. Given the limited severity of impairment and the expectation of timely recovery of outstanding principal, the impairments were considered to be temporary.
Private label commercial mortgage-backed securities:
At December 31, 2014, thirteen private label commercial mortgage-backed securities were in unrealized loss positions. The amount of impairment of each of the individual securities was 2% or less of amortized cost.  These securities were assessed for OTTI using third-party developed 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.
Single family rental real estate-backed securities:
At December 31, 2014, seven single family rental real estate-backed securities were in unrealized loss positions. The securities had been in unrealized loss positions for six months or less and the amount of impairment of each of the individual securities was 2% or less of amortized cost.  Given the limited duration and severity of impairment and the absence of projected credit losses, the impairments were considered to be temporary.
Collateralized loan obligations:
At December 31, 2014, one collateralized loan obligation was in an unrealized loss position. This security had been in an unrealized loss position for four months and the amount of impairment was less than 1% of amortized cost. Given the limited duration and severity of impairment, the impairment was considered to be temporary.
Small Business Administration securities:
At December 31, 2014, two Small Business Administration securities were in unrealized loss positions. These securities had been in unrealized loss positions for less than three months and the amount of impairment was less than 1% of amortized cost. The timely payment of principal and interest on these securities is guaranteed by this U.S. Government agency. Given the limited severity and duration of impairment and the expectation of timely payment of principal and interest, the impairment was considered to be temporary.

Loans_and_Allowance_for_Loan_a

Loans and Allowance for Loan and Lease Losses	12 Months Ended
	Dec. 31, 2014
Receivables [Abstract]
Loans and Allowance for Loan and Lease Losses	Loans and Allowance for Loan and Lease Losses
	At December 31, 2014 and 2013, loans consisted of the following (dollars in thousands):
		2014
		Non-Covered Loans						Covered Loans										Percent of Total
		New Loans			ACI			ACI			Non-ACI				Total
	Residential:
	1-4 single family residential	$	2,486,272		$	—		$	874,522		$	56,138			$	3,416,932		27.6	%
	Home equity loans and lines of credit	1,827			—			22,657			101,142				125,626			1	%
		2,488,099			—			897,179			157,280				3,542,558			28.6	%
	Commercial:
	Multi-family	1,927,225			24,964			—			—				1,952,189			15.8	%
	Commercial real estate
	Owner occupied	1,008,930			34,440			—			—				1,043,370			8.4	%
	Non-owner occupied	1,753,317			30,762			—			—				1,784,079			14.4	%
	Construction and land	167,713			2,007			—			—				169,720			1.4	%
	Commercial and industrial	2,402,064			1,229			—			—				2,403,293			19.4	%
	Commercial finance subsidiaries	1,456,751			—			—			—				1,456,751			11.8	%
		8,716,000			93,402			—			—				8,809,402			71.2	%
	Consumer	26,293			14			—			—				26,307			0.2	%
	Total loans	11,230,392			93,416			897,179			157,280				12,378,267			100	%
	Premiums, discounts and deferred fees and costs, net	47,097			—			—			(10,595		)		36,502
	Loans net of premiums, discounts and deferred fees and costs	11,277,489			93,416			897,179			146,685				12,414,769
	Allowance for loan and lease losses	(91,350		)	—			—			(4,192		)		(95,542		)
	Loans, net	$	11,186,139		$	93,416		$	897,179		$	142,493			$	12,319,227
		2013
		Non-Covered Loans						Covered Loans										Percent of Total
		New Loans			ACI			ACI			Non-ACI				Total
	Residential:
	1-4 single family residential	$	1,800,332		$	—		$	1,057,012		$	70,378			$	2,927,722		32.4	%
	Home equity loans and lines of credit	1,535			—			39,602			127,807				168,944			1.9	%
		1,801,867			—			1,096,614			198,185				3,096,666			34.3	%
	Commercial:
	Multi-family	1,097,872			8,093			33,354			—				1,139,319			12.6	%
	Commercial real estate
	Owner occupied	712,844			5,318			49,861			689				768,712			8.5	%
	Non-owner occupied	946,543			1,449			93,089			52				1,041,133			11.5	%
	Construction and land	138,091			—			10,600			729				149,420			1.7	%
	Commercial and industrial	1,651,739			—			6,050			6,234				1,664,023			18.5	%
	Commercial finance subsidiaries	952,050			—			—			—				952,050			10.5	%
		5,499,139			14,860			192,954			7,704				5,714,657			63.3	%
	Consumer	213,107			—			1,679			—				214,786			2.4	%
	Total loans	7,514,113			14,860			1,291,247			205,889				9,026,109			100	%
	Premiums, discounts and deferred fees and costs, net	40,748			—			—			(13,248		)		27,500
	Loans net of premiums, discounts and deferred fees and costs	7,554,861			14,860			1,291,247			192,641				9,053,609
	Allowance for loan and lease losses	(57,330		)	—			(2,893		)	(9,502		)		(69,725		)
	Loans, net	$	7,497,531		$	14,860		$	1,288,354		$	183,139			$	8,983,884
	Through three subsidiaries, the Bank provides commercial and municipal equipment financing utilizing both loan and lease structures. At December 31, 2014 and 2013, the commercial finance subsidiaries portfolio included a net investment in direct financing leases of $458 million and $340 million, respectively.
	The following table presents the components of the net investment in direct financing leases as of December 31, 2014 and 2013 (in thousands):
		2014			2013
	Total minimum lease payments to be received	$	489,892		$	360,584
	Unearned income	(37,277		)	(23,202		)
	Initial direct costs	5,567			2,980
		$	458,182		$	340,362
	As of December 31, 2014, future minimum lease payments to be received under direct financing leases were as follows (in thousands):
	Years Ending December 31:
	2015	$	146,475
	2016	123,036
	2017	75,867
	2018	42,365
	2019	24,070
	Thereafter	78,079
		$	489,892
	During the years ended December 31, 2014 and 2013, the Company purchased 1-4 single family residential loans totaling $921 million and $1.1 billion, respectively.
	At December 31, 2014, the Company had pledged real estate loans with UPB of approximately $6.9 billion and recorded investment of approximately $5.5 billion as security for FHLB advances.
At December 31, 2014 and 2013, the UPB of ACI loans was $2.6 billion and $3.3 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, 2014, 2013 and 2012 were as follows (in thousands):
Balance, December 31, 2011	$	1,523,615
Reclassifications from non-accretable difference	206,934
Accretion	(444,483		)
Balance, December 31, 2012	1,286,066
Reclassifications from non-accretable difference	282,952
Accretion	(410,446		)
Balance, December 31, 2013	1,158,572
Reclassifications from non-accretable difference	185,604
Accretion	(338,864		)
Balance, December 31, 2014	$	1,005,312
Loan sales
During the years ended December 31, 2014, 2013 and 2012, the Company sold covered 1-4 single family residential loans to third parties on a non-recourse basis. The following table summarizes the impact of these transactions (in thousands):
	2014			2013			2012
UPB of loans sold	$	269,143		$	230,031		$	239,135
Cash proceeds, net of transaction costs	$	177,560		$	116,611		$	103,796
Recorded investment in loans sold	144,231			82,160			103,127
Net pre-tax impact on earnings, excluding gain (loss) on FDIC indemnification	$	33,329		$	34,451		$	669
Gain (loss) on sale of covered loans	$	2,398		$	(16,195	)	$	(29,270	)
Proceeds recorded in interest income	30,931			50,646			29,939
	$	33,329		$	34,451		$	669
Gain (loss) on FDIC indemnification	$	(809	)	$	21,021		$	30,725
For the years ended December 31, 2014, 2013 and 2012, covered 1-4 single family residential loans with UPB of $50 million, $102 million and $73 million, respectively, were sold from a pool of ACI loans with a zero carrying value. Proceeds of the sale of loans from this pool, representing realization of accretable yield, were recorded in interest income. The gain or loss on the sale of loans from the remaining pools, representing the difference between the recorded investment and consideration received, was recorded in “Gain (loss) on sale of loans, net” in the accompanying consolidated statements of income.
During the year ended December 31, 2014, in accordance with the terms of the Commercial Shared-Loss Agreement, the Bank requested and received approval from the FDIC to sell certain covered commercial and consumer loans. These loans were transferred to loans held for sale at the lower of carrying value or fair value, determined at the individual loan level, upon receipt of FDIC approval and sold in March 2014. The reduction of carrying value to fair value for specific loans was recognized in the provision for loan losses.
The following table summarizes the pre-tax impact of these sales, as reflected in the consolidated statements of income for the year ended December 31, 2014 (in thousands):
Cash proceeds, net of transaction costs	$	101,023
Carrying value of loans transferred to loans held for sale	86,521
Provision for loan losses recorded upon transfer to loans held for sale	(3,469		)
Recorded investment in loans sold	83,052
Gain on sale of covered loans	$	17,971
Loss on FDIC indemnification	$	(2,085	)
During the year ended December 31, 2014, the Company made the decision to terminate its indirect auto lending activities and sold indirect auto loans with a recorded investment of $302.8 million. The total impact of this transaction on pre-tax earnings was not material.
Allowance for loan and lease losses
Activity in the ALLL for the years ended December 31, 2014, 2013 and 2012 is summarized as follows (in thousands):
	2014
	Residential			Commercial			Consumer			Total
Beginning balance	$	15,353		$	52,185		$	2,187		$	69,725
Provision for (recovery of) loan losses:
ACI loans	—			1,987			324			2,311
Non-ACI loans	(1,891		)	(663		)	—			(2,554		)
New loans	850			42,310			(1,412		)	41,748
Total provision	(1,041		)	43,634			(1,088		)	41,505
Charge-offs:
ACI loans	—			(4,880		)	(324		)	(5,204		)
Non-ACI loans	(3,006		)	(490		)	—			(3,496		)
New loans	—			(7,671		)	(1,083		)	(8,754		)
Total charge-offs	(3,006		)	(13,041		)	(1,407		)	(17,454		)
Recoveries:
Non-ACI loans	19			721			—			740
New loans	—			528			498			1,026
Total recoveries	19			1,249			498			1,766
Ending balance	$	11,325		$	84,027		$	190		$	95,542
	2013
	Residential			Commercial			Consumer			Total
Beginning balance	$	19,164		$	39,543		$	414		$	59,121
Provision for (recovery of) loan losses:
ACI loans	—			(2,891		)	—			(2,891		)
Non-ACI loans	4,043			(2,890		)	—			1,153
New loans	(3,800		)	35,368			2,134			33,702
Total provision	243			29,587			2,134			31,964
Charge-offs:
ACI loans	—			(2,235		)	—			(2,235		)
Non-ACI loans	(4,134		)	(171		)	—			(4,305		)
New loans	(10		)	(17,987		)	(484		)	(18,481		)
Total charge-offs	(4,144		)	(20,393		)	(484		)	(25,021		)
Recoveries:
Non-ACI loans	90			2,690			—			2,780
New loans	—			758			123			881
Total recoveries	90			3,448			123			3,661
Ending balance	$	15,353		$	52,185		$	2,187		$	69,725
	2012
	Residential			Commercial			Consumer			Total
Beginning balance	$	10,175		$	38,176		$	51		$	48,402
Provision for (recovery of) loan losses:
ACI loans	—			(4,347		)	—			(4,347		)
Non-ACI loans	6,175			(2,331		)	—			3,844
New loans	6,060			12,979			360			19,399
Total provision	12,235			6,301			360			18,896
Charge-offs:
ACI loans	—			(3,966		)	—			(3,966		)
Non-ACI loans	(3,275		)	(316		)	—			(3,591		)
New loans	—			(2,929		)	—			(2,929		)
Total charge-offs	(3,275		)	(7,211		)	—			(10,486		)
Recoveries:
Non-ACI loans	29			1,850			—			1,879
New loans	—			427			3			430
Total recoveries	29			2,277			3			2,309
Ending balance	$	19,164		$	39,543		$	414		$	59,121
Revisions to ALLL inputs, as described in Note 1, resulted in increased provisions of approximately $10 million for the year ended December 31, 2014.
The following table presents information about the balance of the ALLL and related loans as of December 31, 2014 and 2013 (in thousands):
	2014													2013
	Residential			Commercial			Consumer			Total				Residential			Commercial		Consumer		Total
Allowance for loan and lease losses:
Ending balance	$	11,325		$	84,027		$	190		$	95,542			$	15,353		$	52,185	$	2,187	$	69,725
Ending balance: non-ACI and new loans individually evaluated for impairment	$	1,083		$	6,878		$	—		$	7,961			$	855		$	9,467	$	—	$	10,322
Ending balance: non-ACI and new loans collectively evaluated for impairment	$	10,242		$	77,149		$	190		$	87,581			$	14,498		$	39,825	$	2,187	$	56,510
Ending balance: ACI	$	—		$	—		$	—		$	—			$	—		$	2,893	$	—	$	2,893
Ending balance: non-ACI	$	4,192		$	—		$	—		$	4,192			$	9,070		$	432	$	—	$	9,502
Ending balance: new loans	$	7,133		$	84,027		$	190		$	91,350			$	6,283		$	48,860	$	2,187	$	57,330
Loans:																					0
Ending balance	$	3,568,529		$	8,819,980		$	26,260		$	12,414,769			$	3,111,167		$	5,720,722	$	221,720	$	9,053,609
Ending balance: non-ACI and new loans individually evaluated for impairment	$	6,406		$	28,978		$	—		$	35,384			$	5,663		$	22,584	$	—	$	28,247
Ending balance: non-ACI and new loans collectively evaluated for impairment	$	2,664,944		$	8,697,600		$	26,246		$	11,388,790			$	2,008,890		$	5,490,324	$	220,041	$	7,719,255
Ending balance: ACI loans	$	897,179		$	93,402		$	14		$	990,595			$	1,096,614		$	207,814	$	1,679	$	1,306,107
Credit quality information
The tables below present information about loans or ACI pools identified as impaired as of December 31, 2014 and 2013 (in thousands):
	2014									2013
	Recorded			UPB			Related			Recorded				UPB			Related
	Investment						Specific			Investment							Specific
							Allowance										Allowance
New loans:
With no specific allowance recorded:
Commercial real estate
Owner occupied	$	2,984		$	2,961		$	—		$	1,751			$	1,754		$	—
Non-owner occupied	1,326			1,326			—			1,444				1,444			—
Commercial and industrial	4,830			4,826			—			—				—			—
Commercial finance subsidiaries	1,790			1,790			—			—				—			—
With a specific allowance recorded:
Commercial and industrial	11,152			11,157			4,054			16,048				16,055			8,696
Commercial finance subsidiaries	6,896			6,896			2,824			1,345				1,345			771
Total:
Residential	$	—		$	—		$	—		$	—			$	—		$	—
Commercial	28,978			28,956			6,878			20,588				20,598			9,467
Consumer	—			—			—			—				—			—
	$	28,978		$	28,956		$	6,878		$	20,588			$	20,598		$	9,467
Non-ACI loans:
With no specific allowance recorded:
1-4 single family residential	$	358		$	426		$	—		$	168			$	198		$	—
Home equity loans and lines of credit	1,621			1,647			—			1,703				1,734			—
Commercial and industrial	—			—			—			1,996				1,999			—
With a specific allowance recorded:
1-4 single family residential	3,493			4,158			945			3,564				4,203			827
Home equity loans and lines of credit	934			949			138			228				232			28
Total:
Residential	$	6,406		$	7,180		$	1,083		$	5,663			$	6,367		$	855
Commercial	—			—			—			1,996				1,999			—
	$	6,406		$	7,180		$	1,083		$	7,659			$	8,366		$	855
ACI loans:
With no specific allowance recorded:
Commercial real estate
Non-owner occupied	$	—		$	—		$	—		$	384			$	406		$	—
Construction and land	—			—			—			567				588			—
With a specific allowance recorded:
Multi-family	—			—			—			3,478				3,459			323
Commercial real estate
Owner occupied	—			—			—			2,643				2,812			369
Non-owner occupied	—			—			—			32,436				37,392			1,444
Construction and land	—			—			—			1,686				1,500			192
Commercial and industrial	—			—			—			3,932				4,262			565
	$	—		$	—		$	—		$	45,126			$	50,419		$	2,893
Interest income recognized on impaired loans after impairment was not significant for any of the periods presented.
The following table presents the average recorded investment in impaired loans for the years ended December 31, 2014, 2013 and 2012 (in thousands):
	2014									2013									2012
	New Loans			Non-ACI			ACI Loans			New Loans				Non-ACI			ACI Loans		New Loans		Non-ACI		ACI Loans
				Loans										Loans							Loans
Residential:
1-4 single family residential	$	—		$	3,748		$	—		$	—			$	3,891		$	—	$	—	$	2,757	$	—
Home equity loans and lines of credit	—			2,417			—			—				1,494			—		—		119		—
	—			6,165			—			—				5,385			—		—		2,876		—
Commercial:
Multi-family	—			—			696			730				—			4,804		4,614		—		11,936
Commercial real estate
Owner occupied	2,949			—			529			—				—			3,260		—		—		5,754
Non-owner occupied	1,385			—			6,564			2,224				—			22,883		1,291		143		36,198
Construction and land	—			—			451			—				—			3,873		190		1,074		12,482
Commercial and industrial	15,058			399			786			16,837				2,424			5,744		7,274		3,749		12,825
Commercial finance subsidiaries	2,680			—			—			1,478				—			—		671		—		—
	22,072			399			9,026			21,269				2,424			40,564		14,040		4,966		79,195
	$	22,072		$	6,564		$	9,026		$	21,269			$	7,809		$	40,564	$	14,040	$	7,842	$	79,195
The following table presents the recorded investment in new and non-ACI loans on non-accrual status as of December 31, 2014 and 2013 (in thousands):
	2014						2013
	New			Non-ACI			New			Non-ACI
	Loans			Loans			Loans			Loans
Residential:
1-4 single family residential	$	49		$	604		$	194		$	293
Home equity loans and lines of credit	—			3,808			—			6,559
	49			4,412			194			6,852
Commercial:
Commercial real estate
Owner occupied	3,362			—			2,785			—
Non-owner occupied	1,326			—			1,444			52
Construction and land	209			—			244			—
Commercial and industrial	13,666			—			16,448			2,765
Commercial finance subsidiaries	9,226			—			1,534			—
	27,789			—			22,455			2,817
Consumer	173			—			75			—
	$	28,011		$	4,412		$	22,724		$	9,669
As of December 31, 2013, discount was no longer being accreted on ACI commercial real estate loans with a carrying value of $1 million.
There were no new and non-ACI loans contractually delinquent by 90 days or more and still accruing at December 31, 2014. New and non-ACI loans contractually delinquent by 90 days or more and still accruing totaled $0.5 million at December 31, 2013.  The amount of additional interest income that would have been recognized on non-accrual loans had they performed in accordance with their contractual terms is not material.
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 new 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. Relationships with balances in excess of $1 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 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, 2014 and 2013. Amounts are net of premiums, discounts and deferred fees and costs (in thousands):
1-4 Single Family Residential credit exposure for new loans, based on original LTV and FICO score:
		2014
		FICO
LTV		720 or less			721 - 740			741 - 760			761 or				Total
											greater
60% or less		$	64,590		$	79,518		$	128,115		$	596,843			$	869,066
60% - 70%		55,075			63,642			102,054			424,487				645,258
70% - 80%		43,316			98,052			170,305			650,165				961,838
More than 80%		28,218			3,261			3,450			11,747				46,676
		$	191,199		$	244,473		$	403,924		$	1,683,242			$	2,522,838
		2013
		FICO
LTV		720 or less			721 - 740			741 - 760			761 or				Total
											greater
60% or less		$	37,293		$	60,626		$	86,920		$	473,250			$	658,089
60% - 70%		25,861			45,485			77,253			308,242				456,841
70% - 80%		19,610			60,021			116,332			472,279				668,242
More than 80%		26,492			5,487			3,166			9,463				44,608
		$	109,256		$	171,619		$	283,671		$	1,263,234			$	1,827,780
Commercial credit exposure, based on internal risk rating:
	2014
				Commercial Real Estate
	Multi-Family			Owner Occupied			Non-Owner Occupied			Construction				Commercial			Commercial Finance Subsidiaries		Total
										and Land				and
														Industrial
New loans:
Pass	$	1,930,324		$	995,062		$	1,750,753		$	166,929			$	2,364,792		$	1,441,670	$	8,649,530
Special mention	—			8,303			—			—				9,165			7,155		24,623
Substandard	408			6,426			1,326			209				21,501			11,044		40,914
Doubtful	—			—			—			—				5,121			6,390		11,511
	$	1,930,732		$	1,009,791		$	1,752,079		$	167,138			$	2,400,579		$	1,466,259	$	8,726,578
ACI loans:
Pass	$	22,762		$	34,440		$	30,101		$	2,007			$	1,156		$	—	$	90,466
Special mention	—			—			509			—				—			—		509
Substandard	2,202			—			152			—				67			—		2,421
Doubtful	—			—			—			—				6			—		6
	$	24,964		$	34,440		$	30,762		$	2,007			$	1,229		$	—	$	93,402
	2013
				Commercial Real Estate
	Multi-Family			Owner Occupied			Non-Owner Occupied			Construction				Commercial			Commercial Finance Subsidiaries		Total
										and Land				and
														Industrial
New loans:
Pass	$	1,098,383		$	704,403		$	946,208		$	137,513			$	1,624,492		$	950,831	$	5,461,830
Special mention	—			—			—			—				3,513			4,379		7,892
Substandard	770			7,080			1,444			244				15,672			833		26,043
Doubtful	—			51			—			—				8,918			771		9,740
	$	1,099,153		$	711,534		$	947,652		$	137,757			$	1,652,595		$	956,814	$	5,505,505
Non-ACI loans:
Pass	$	—		$	687		$	—		$	688			$	3,177		$	—	$	4,552
Substandard	—			—			52			—				2,379			—		2,431
Doubtful	—			—			—			—				420			—		420
	$	—		$	687		$	52		$	688			$	5,976		$	—	$	7,403
ACI loans:
Pass	$	31,002		$	40,725		$	53,238		$	7,373			$	1,824		$	—	$	134,162
Special mention	—			1,000			3,361			—				—			—		4,361
Substandard	10,445			13,454			37,845			3,227				4,206			—		69,177
Doubtful	—			—			94			—				20			—		114
	$	41,447		$	55,179		$	94,538		$	10,600			$	6,050		$	—	$	207,814
Aging of loans:
The following table presents an aging of loans as of December 31, 2014 and 2013. Amounts are net of premiums, discounts and deferred fees and costs (in thousands):
	2014																2013
	Current			30 - 59			60 - 89			90 Days or				Total			Current		30 - 59		60 - 89		90 Days or		Total
				Days Past			Days Past			More Past									Days Past		Days Past		More Past
				Due			Due			Due or in									Due		Due		Due or in
										Foreclosure													Foreclosure
New loans:
1-4 single family residential	$	2,518,357		$	4,432		$	—		$	49			$	2,522,838		$	1,824,084	$	2,990	$	109	$	597	$	1,827,780
Home equity loans and lines of credit	1,827			—			—			—				1,827			1,535		—		—		—		1,535
Multi-family	1,929,546			1,186			—			—				1,930,732			1,099,153		—		—		—		1,099,153
Commercial real estate
Owner occupied	1,008,576			836			—			379				1,009,791			710,938		—		—		596		711,534
Non-owner occupied	1,752,079			—			—			—				1,752,079			947,652		—		—		—		947,652
Construction and land	167,138			—			—			—				167,138			137,757		—		—		—		137,757
Commercial and industrial	2,396,549			1,696			327			2,007				2,400,579			1,644,292		494		165		7,644		1,652,595
Commercial finance subsidiaries	1,458,890			5,208			246			1,915				1,466,259			956,673		116		25		—		956,814
Consumer	26,116			2			10			118				26,246			219,083		766		161		31		220,041
	$	11,259,078		$	13,360		$	583		$	4,468			$	11,277,489		$	7,541,167	$	4,366	$	460	$	8,868	$	7,554,861
Non-ACI loans:
1-4 single family residential	$	45,959		$	602		$	563		$	41			$	47,165		$	56,248	$	3,129	$	293	$	—	$	59,670
Home equity loans and lines of credit	93,427			1,739			546			3,808				99,520			116,036		2,417		556		6,559		125,568
Commercial real estate
Owner occupied	—			—			—			—				—			687		—		—		—		687
Non-owner occupied	—			—			—			—				—			52		—		—		—		52
Construction and land	—			—			—			—				—			688		—		—		—		688
Commercial and industrial	—			—			—			—				—			3,722		—		4		2,250		5,976
	$	139,386		$	2,341		$	1,109		$	3,849			$	146,685		$	177,433	$	5,546	$	853	$	8,809	$	192,641
ACI loans:
1-4 single family residential	$	829,412		$	18,463		$	4,689		$	21,958			$	874,522		$	957,791	$	33,067	$	10,279	$	55,875	$	1,057,012
Home equity loans and lines of credit	20,474			558			125			1,500				22,657			33,967		1,150		329		4,156		39,602
Multi-family	24,964			—			—			—				24,964			38,877		—		—		2,570		41,447
Commercial real estate
Owner occupied	34,440			—			—			—				34,440			54,501		253		—		425		55,179
Non-owner occupied	30,746			9			—			7				30,762			81,754		3,245		—		9,539		94,538
Construction and land	2,007			—			—			—				2,007			7,373		—		—		3,227		10,600
Commercial and industrial	1,196			3			—			30				1,229			3,193		—		—		2,857		6,050
Consumer	14			—			—			—				14			1,477		—		201		1		1,679
	$	943,253		$	19,033		$	4,814		$	23,495			$	990,595		$	1,178,933	$	37,715	$	10,809	$	78,650	$	1,306,107
1-4 single family residential and home equity ACI loans that are contractually delinquent by more than 90 days and accounted for in pools that are on accrual status because discount continues to be accreted totaled $23 million and $60 million at December 31, 2014 and 2013, respectively. The recorded investment in commercial and commercial real estate ACI loans that were contractually delinquent in excess of ninety days but still classified as accruing loans due to discount accretion totaled $18 million at December 31, 2013.
Loan Concentrations
At December 31, 2014 and 2013, 1-4 single family residential loans outstanding were to customers domiciled in the following states (dollars in thousands)
	2014
										Percent of Total
	New Loans			Covered Loans			Total			New Loans			Total Loans
California	$	1,045,430		$	66,105		$	1,111,535		41.4	%		32.3	%
Florida	335,073			483,297			818,370			13.3	%		23.8	%
New York	318,484			27,568			346,052			12.6	%		10	%
Others	823,851			344,717			1,168,568			32.7	%		33.9	%
	$	2,522,838		$	921,687		$	3,444,525		100	%		100	%
	2013
										Percent of Total
	New Loans			Covered Loans			Total			New Loans			Total Loans
California	$	865,342		$	80,919		$	946,261		47.3	%		32.1	%
Florida	241,827			604,384			846,211			13.2	%		28.7	%
New York	119,147			31,406			150,553			6.5	%		5.1	%
Others	601,464			399,973			1,001,437			33	%		34.1	%
	$	1,827,780		$	1,116,682		$	2,944,462		100	%		100	%
No other state represented borrowers with more than 5.0% of new or total 1-4 single family residential loans outstanding at December 31, 2014. At December 31, 2014, 48.3% and 36.6%, respectively, of loans in the new commercial portfolio were to borrowers in Florida and the New York tri-state area, respectively.
Troubled debt restructurings:
Modifications during the years ended December 31, 2014, 2013 and 2012 included restructuring of the amount and timing of required periodic payments, extensions of maturity and residential modifications under the U.S. Treasury Department’s Home Affordable Modification Program (“HAMP”).  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. Because of the immateriality of the number and dollar amount of loans modified in TDRs and nature of the modifications, the modifications did not have a material impact on the Company’s consolidated financial statements or on the determination of the amount of the ALLL for the years ended December 31, 2014, 2013 and 2012.

FDIC_Indemnification_Asset

FDIC Indemnification Asset	12 Months Ended
	Dec. 31, 2014
FDIC Indemnification Asset [Abstract]
FDIC Indemnification Asset	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 carrying value of the loans is recognized in the 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 OREO and covered loans and their 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.
	In addition, recoveries of previously indemnified losses on commercial loans and gains on the sale of investment securities that were previously covered under the Commercial Shared-Loss Agreement result in reimbursements due to the FDIC. These transactions are included in the tables below. Amounts payable to the FDIC resulting from these transactions are recognized in other liabilities in the consolidated balance sheet at December 31, 2014.
	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, 2014, 2013 and 2012 (in thousands):
		2014
		Transaction				Net Loss on FDIC			Net Impact
		Income				Indemnification			on Pre-tax
									Earnings
	Recovery of losses on covered loans (1)	$	33			$	(54	)	$	(21	)
	Income from resolution of covered assets, net	49,082				(39,127		)	9,955
	Gain on sale of covered loans	20,369				(5,338		)	15,031
	Gain on covered investment securities available for sale	209				(167		)	42
	Gain on covered OREO	2,744				(1,710		)	1,034
		$	72,437			$	(46,396	)	$	26,041
	-1	Transaction income includes provisions of $210 related to unfunded loan commitments included in other non-interest expense in the accompanying consolidated income statement.
		2013
		Transaction				Net Loss on FDIC			Net Impact
		Income (Loss)				Indemnification			on Pre-tax
									Earnings
	Recovery of losses on covered loans	$	1,738			$	(1,574	)	$	164
	Income from resolution of covered assets, net	78,862				(64,793		)	14,069
	Loss on sale of covered loans	(16,195		)		21,021			4,826
	Loss on covered investment securities available for sale	(963		)		770			(193		)
	Gain on covered OREO	7,629				(6,062		)	1,567
		$	71,071			$	(50,638	)	$	20,433
		2012
		Transaction				Net Loss on FDIC			Net Impact
		Income (Loss)				Indemnification			on Pre-tax
									Earnings
	Recovery of losses on covered loans	$	503			$	344		$	847
	Income from resolution of covered assets, net	51,016				(41,962		)	9,054
	Loss on sale of covered loans	(29,270		)		30,725			1,455
	Loss on covered OREO	(5,762		)		4,863			(899		)
		$	16,487			$	(6,030	)	$	10,457
	For a number of reasons, the gain or loss on FDIC indemnification may not bear the relationship to net income or loss from transactions in the covered assets that might generally be expected based on the Loss Sharing Agreements. These reasons include, but are not limited to, the fact that the amount of indemnification from the resolution of covered loans is generally based on the UPB of the loans rather than carrying value and proceeds in excess of the contractual UPB of the loans are not subject to loss sharing.
	Changes in the FDIC indemnification asset and in the liability to the FDIC for recoveries related to assets previously covered under the Commercial Shared-Loss Agreement for the years ended December 31, 2014, 2013 and 2012, were as follows (in thousands):
	Balance at December 31, 2011		$	2,049,151
	Accretion		15,306
	Reduction for claims filed		(600,857		)
	Net loss on FDIC indemnification		(6,030		)
	Balance at December 31, 2012		1,457,570
	Amortization		(36,943		)
	Reduction for claims filed		(164,872		)
	Net loss on FDIC indemnification		(50,638		)
	Balance at December 31, 2013		1,205,117
	Amortization		(69,470		)
	Reduction for claims filed		(114,916		)
	Net loss on FDIC indemnification		(46,396		)
	Balance at December 31, 2014		$	974,335
	The balance at December 31, 2014 is reflected in the consolidated balance sheet as follows (in thousands):
	FDIC indemnification asset		$	974,704
	Other liabilities		(369		)
			$	974,335

Equipment_Under_Operating_Leas

Equipment Under Operating Lease	12 Months Ended
	Dec. 31, 2014
Leases [Abstract]
Equipment Under Operating Lease	Equipment Under Operating Lease
	Equipment under operating lease consists of rail cars. The components of equipment under operating lease as of December 31, 2014 and 2013 are summarized as follows (in thousands):
		2014			2013
	Equipment under operating lease	$	324,295		$	201,163
	Less: accumulated depreciation	(9,737		)	(4,680		)
	Equipment under operating lease, net	$	314,558		$	196,483
	Depreciation expense related to equipment under operating lease was $8.8 million, $4.3 million and $0.4 million for the years ended December 31, 2014, 2013 and 2012, respectively.
	At December 31, 2014, scheduled minimum rental payments under operating leases were as follows (in thousands):
	Years Ending December 31:
	2015	$	23,902
	2016	23,792
	2017	21,583
	2018	18,992
	2019	16,511
	Thereafter through 2024	24,243
		$	129,023

Other_Real_Estate_Owned

Other Real Estate Owned	12 Months Ended
	Dec. 31, 2014
Other Real Estate [Abstract]
Other Real Estate Owned	Other Real Estate Owned
	An analysis of OREO activity for the years ended December 31, 2014, 2013 and 2012 follows (in thousands):
		2014			2013			2012
	Balance, beginning of period	$	40,570		$	76,022		$	123,737
	Transfers from loan portfolio	26,564			68,084			151,302
	Sales	(52,119		)	(101,597		)	(189,091		)
	Impairment	(1,235		)	(1,939		)	(9,926		)
	Balance, end of period	$	13,780		$	40,570		$	76,022

Premises_and_Equipment_and_Lea

Premises and Equipment and Lease Commitments	12 Months Ended
	Dec. 31, 2014
Premises and Equipment and Lease Commitments [Abstract]
Premises and Equipment and Lease Commitments	Premises and Equipment and Lease Commitments
	Premises and equipment are included in other assets in the accompanying consolidated balance sheets and are summarized as follows as of December 31, 2014 and 2013 (in thousands):
		2014			2013
	Buildings and improvements	$	25,739		$	18,049
	Leasehold improvements	61,336			47,912
	Construction in progress	149			3,293
	Furniture, fixtures and equipment	34,542			29,880
	Computer equipment	13,555			11,212
	Software and software licensing rights	31,672			26,855
		166,993			137,201
	Less: accumulated depreciation	(61,808		)	(42,923		)
	Premises and equipment, net	$	105,185		$	94,278
	Buildings and improvements includes $11 million and $2 million related to property under capital lease at December 31, 2014 and 2013, respectively.
	Depreciation and amortization expense related to premises and equipment, including amortization of assets recorded under capital leases, was $22.1 million, $18.2 million and $14.0 million for the years ended December 31, 2014, 2013 and 2012, 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, 2014, 2013 and 2012 was $25.4 million, $26.0 million and $23.3 million, respectively.
	As of December 31, 2014, 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:
	2015	$	20,834
	2016	20,350
	2017	20,188
	2018	18,989
	2019	17,383
	Thereafter through 2034	81,756
		$	179,500

Deposits

Deposits	12 Months Ended
	Dec. 31, 2014
Banking and Thrift [Abstract]
Deposits	Deposits
	The following table presents average balances and weighted average rates paid on deposits for the years ended December 31, 2014, 2013 and 2012 (dollars in thousands):
		2014				2013					2012
		Average		Average		Average			Average		Average		Average
		Balance		Rate		Balance			Rate		Balance		Rate
				Paid					Paid				Paid
	Demand deposits:
	Non-interest bearing	$	2,366,621	—	%	$	1,586,007		—	%	$	1,099,448	—	%
	Interest bearing	773,655		0.42	%	582,623			0.46	%	504,614		0.63	%
	Money market	4,444,753		0.54	%	3,403,276			0.51	%	2,838,735		0.63	%
	Savings	647,691		0.3	%	877,255			0.37	%	1,073,709		0.58	%
	Time	3,716,611		1.18	%	2,844,377			1.31	%	2,632,451		1.48	%
		$	11,949,331	0.61	%	$	9,293,538		0.65	%	$	8,148,957	0.81	%
	Time deposit accounts with balances of $100,000 or more totaled approximately $2.9 billion and $2.1 billion at December 31, 2014 and 2013, respectively. Time deposit accounts with balances of $250,000 or more totaled $1.3 billion and $829 million at December 31, 2014 and 2013, respectively.
	The following table presents maturities of time deposits as of December 31, 2014 (in thousands):
	Maturing in:
	2015	$	3,205,042
	2016	478,714
	2017	289,236
	2018	11,023
	2019	17,774
	Thereafter through 2023	136
		$	4,001,925
	Included in deposits at December 31, 2014 are public funds deposits of $1.8 billion and brokered deposits of $345 million. Investment securities available for sale with a carrying value of $456 million and a standby letter of credit issued by the FHLB on the Bank's behalf in the amount of $400 million were pledged as security for public funds deposits at December 31, 2014.
	Interest expense on deposits for the years ended December 31, 2014, 2013 and 2012 was as follows (in thousands):
		2014		2013			2012
	Interest bearing demand	$	3,254	$	2,698		$	3,155
	Money market	23,944		17,355			17,878
	Savings	1,971		3,265			6,215
	Time	43,792		37,248			38,930
		$	72,961	$	60,566		$	66,178

Federal_Home_Loan_Bank_Advance

Federal Home Loan Bank Advances and Other Borrowings	12 Months Ended
	Dec. 31, 2014
Advances from Federal Home Loan Banks [Abstract]
Federal Home Loan Bank Advances and Other Borrowings	Federal Home Loan Bank Advances and Other Borrowings
	At December 31, 2014 and 2013 outstanding FHLB advances and other borrowings consisted of the following (dollars in thousands):
		2014			2013
	FHLB advances	$	3,307,932		$	2,412,050
	Securities sold under agreements to repurchase	—			346
	Capital lease obligations	10,627			1,917
		$	3,318,559		$	2,414,313
	Securities sold under agreements to repurchase are offered to certain deposit customers, generally mature daily, and are not a significant source of funds for the Company. As of December 31, 2014 and 2013, the Company had pledged securities with a carrying value of approximately $21 million and $23 million, respectively, as collateral for securities sold under agreements to repurchase.
	The following table presents information about outstanding FHLB advances as of December 31, 2014 (dollars in thousands):
					Range of Interest Rates
									Weighted
		Amount			Minimum		Maximum		Average Rate
	Maturing in:
	2015—31 days or less	$	525,000		0.17	%	0.26	%	0.22	%
	2015—Over 31 days	2,080,350			—	%	0.79	%	0.31	%
	2016	450,000			0.51	%	0.79	%	0.63	%
	2017	255,000			0.95	%	1.31	%	1.05	%
	Total contractual balance outstanding	3,310,350
	Unamortized modification costs	(2,418		)
	Carrying value	$	3,307,932
	During 2012, the Company modified FHLB advances with an outstanding balance of $105 million, extending the maturity and reducing the rate on the advances, incurring modification fees of $5.3 million. Additionally, during 2012, the Company elected to prepay $520 million of FHLB advances with a carrying value of $524 million for an aggregate cash payment of $538 million. The Company recorded a loss of $14.2 million on this extinguishment of debt.
	Deferred modification costs on FHLB advances are being amortized as adjustments to interest expense over the remaining terms of the related advances using the effective yield method. Prior to 2014, acquisition accounting fair value adjustments were also being amortized. The amortization of these adjustments and costs increased (reduced) interest expense by $882 thousand, $131 thousand and $(14.8) million during the years ended December 31, 2014, 2013 and 2012, respectively.
	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, 2014, the Company had pledged investment securities and real estate loans with an aggregate carrying amount of approximately $5.9 billion as collateral for advances from the FHLB.
	At December 31, 2014, BankUnited had available borrowing capacity at the FHLB of approximately $1.5 billion, unused borrowing capacity at the FRB of approximately $88 million and unused Federal funds lines of credit with other financial institutions totaling $175 million.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes
	The components of the provision for income taxes for the years ended December 31, 2014, 2013 and 2012 were as follows (in thousands):
		2014			2013				2012
	Current:
	Federal	$	121,063		$	94,724			$	170,973
	State	7,549			6,105				34,860
		128,612			100,829				205,833
	Deferred:
	Federal	(27,468		)	5,028				(60,985		)
	State	(12,109		)	3,209				(11,243		)
		(39,577		)	8,237				(72,228		)
		$	89,035		$	109,066			$	133,605
	A reconciliation of expected income tax expense at the statutory federal income tax rate of 35% to the Company’s effective income tax rate for the years ended December 31, 2014, 2013 and 2012 follows (dollars in thousands):
		2014						2013						2012
		Amount			Percent			Amount				Percent		Amount			Percent
	Tax expense calculated at the statutory federal income tax rate	$	102,637		35	%		$	111,301			35	%	$	120,703		35	%
	Increases (decreases) resulting from:
	Income not subject to tax	(10,056		)	(3.43	)%		(7,065		)		(2.22	)%	(6,019		)	(1.75	)%
	State income taxes, net of federal tax benefit	6,259			2.13	%		9,896				3.11	%	12,967			3.76	%
	Uncertain tax positions - lapse of statute of limitations	(5,098		)	(1.74	)%		(3,597		)		(1.13	)%	—			—	%
	Other, net	(4,707		)	(1.60	)%		(1,469		)		(0.46	)%	5,954			1.73	%
		89,035			30.36	%		109,066				34.3	%	133,605			38.74	%
	The components of deferred tax assets and liabilities at December 31, 2014 and 2013 were as follows (in thousands):
		2014			2013
	Deferred tax assets:
	Excess of tax basis over carrying value of acquired loans	$	152,870		$	199,715
	Allowance for loan and lease losses	37,091			26,639
	Acquisition costs	11,257			12,119
	Net operating loss and tax credit carryforwards	10,525			6,894
	Net unrealized losses on derivatives designated as cash flow hedges	13,836			7,080
	Other	21,171			19,210
	Gross deferred tax assets	246,750			271,657
	Deferred tax liabilities:
	Deferred tax gain resulting from the FSB Acquisition	—			107,512
	Net unrealized gains on investment securities available for sale	43,123			43,177
	Lease financing, due to differences in depreciation	71,024			34,624
	Premises and equipment, due to differences in depreciation	8,851			10,457
	Other	6,537			5,261
	Gross deferred tax liabilities	129,535			201,031
	Net deferred tax asset	$	117,215		$	70,626
	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, 2014, remaining net operating loss and tax credit carryforwards included federal net operating loss carryforwards resulting from the acquisition of Herald in the amount of $16.9 million, expiring from 2029 through 2032, Florida net operating loss carryforwards in the amount of $85.7 million, expiring from 2030 through 2034, and state tax credit carryforwards of $1.6 million, expiring in 2018. The Company established deferred tax assets of $2.9 million for the year ended December 31, 2014 related to Florida net operating losses and recognized current tax benefits of $0.8 million related to the usage of federal net operating losses for each of the years ended December 31, 2014, 2013 and 2012.
	Deferred tax benefits of $2.4 million were recognized for the year ended December 31, 2014 related to enacted changes in state tax laws.
	The Company has a liability for unrecognized tax benefits relating to uncertain tax positions primarily for state tax contingencies in several jurisdictions. A reconciliation of the beginning and ending amount of gross unrecognized tax benefits for the years ended December 31, 2014, 2013 and 2012 follows (in thousands):
		2014			2013				2012
	Balance, beginning of period	$	21,898		$	24,790			$	20,961
	Additions for tax positions related to the current year	3,797			699				1,246
	Additions for tax positions related to prior periods	22,089			—				—
	Reductions due to settlements with taxing authorities	(3,807		)	—				(41		)
	Reductions due to lapse of the statute of limitations	(4,739		)	(3,340		)		—
		39,238			22,149				22,166
	Interest and penalties	(2,616		)	(251		)		2,624
	Balance, end of period	$	36,622		$	21,898			$	24,790
	As of December 31, 2014, 2013 and 2012, the Company had $21.3 million, $10.0 million and $11.7 million of unrecognized 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, 2014 as a result of the lapse in the statute of limitations total approximately $5.8 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, 2014 and 2013, accrued interest and penalties included in the consolidated balance sheets, net of federal tax benefits, were $3.2 million and $5.5 million, respectively. The total amounts of interest and penalties, net of federal tax benefits, recognized through income tax expense were $(2.3) million, $(0.3) million and $2.1 million in 2014, 2013 and 2012, respectively, including the reversal of $3.2 million and $1.4 million of interest and penalties due to lapse of the statute of limitations in 2014 and 2013, 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. In June 2013, the federal income tax audit for the 2009 tax year was closed, with no material adjustments required. Income tax returns for the tax years ended December 31, 2014, 2013, 2012, 2011 and 2010 remain subject to examination in the U.S. Federal and various state tax jurisdictions. The tax year ended December 31, 2009 remains subject to examination by the state of Florida.

Derivatives_and_Hedging_Activi

Derivatives and Hedging Activities	12 Months Ended
	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives and Hedging Activities	Derivatives and Hedging Activities
	The Company uses interest rate swaps to manage interest rate risk related to variable rate FHLB advances and certificates of deposit with maturities of one year, which 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.
	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, 2014, 2013 and 2012 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 International Swaps and Derivatives Association ("ISDA") master agreements 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 following tables set forth certain information concerning the Company’s interest rate contract derivative financial instruments and related hedged items at December 31, 2014 and 2013 (dollars in thousands):
		2014
				Weighted	Weighted		Weighted
				Average Pay Rate	Average Receive Rate		Average
							Remaining	Notional Amount			Balance Sheet Location		Fair value
		Hedged Item					Life in Years						Asset				Liability
	Derivatives designated as cash flow hedges:
	Pay-fixed interest rate swaps	Variability of interest cash flows on certificates of deposit		3.11%	12-Month Libor		0.8	$	225,000		Other liabilities		$	—			$	(5,741	)
	Pay-fixed interest rate swaps	Variability of interest cash flows on variable rate borrowings		1.61%	3-Month Libor		2.8	1,505,000			Other assets / Other liabilities		4,083				(19,639		)
	Pay-fixed forward-starting interest rate swaps	Variability of interest cash flows on variable rate borrowings		3.43%	3-Month Libor		12.5	300,000			Other assets / Other liabilities		—				(18,115		)
	Derivatives not designated as hedges:
	Pay-fixed interest rate swaps and caps			4.34%	Indexed to 1-month Libor		6.3	537,368			Other assets / Other liabilities		60				(25,622		)
	Pay-variable interest rate swaps and caps			Indexed to 1-month Libor	4.34%		6.3	537,368			Other assets / Other liabilities		25,622				(60		)
								$	3,104,736				$	29,765			$	(69,177	)
		2013
				Weighted	Weighted		Weighted
				Average Pay Rate	Average Receive Rate		Average
							Remaining	Notional Amount			Balance Sheet Location		Fair value
		Hedged Item					Life in Years						Asset				Liability
	Derivatives designated as cash flow hedges:
	Pay-fixed interest rate swaps	Variability of interest cash flows on certificates of deposit		3.11%	12-Month Libor		1.9	$	225,000		Other liabilities		$	—			$	(10,591	)
	Pay-fixed interest rate swaps	Variability of interest cash flows on variable rate borrowings		1.61%	3-Month Libor		3.8	1,505,000			Other assets / Other liabilities		16,960				(28,326		)
	Derivatives not designated as hedges:
	Pay-fixed interest rate swaps and caps			4.62%	Indexed to 1-month Libor		6.4	283,751			Other assets / Other liabilities		1,055				(3,816		)
	Pay-variable interest rate swaps and caps			Indexed to 1-month Libor	4.62%		6.4	283,751			Other assets / Other liabilities		3,816				(1,055		)
								$	2,297,502				$	21,831			$	(43,788	)
	The following table provides information about gains and losses related to interest rate contract derivative instruments designated as cash flow hedges for the years ended December 31, 2014, 2013 and 2012 (in thousands):
		2014			2013			2012
	Amount of loss reclassified from AOCI into interest expense during the period (effective portion)	$	(26,671	)	$	(21,827	)	$	(17,962	)
	Amount of loss related to termination of cash flow hedges reclassified from AOCI into non-interest income during the period	$	—		$	—		$	(8,701	)
	Amount of gain (loss) recognized in income during the period (ineffective portion)	$	—		$	—		$	—
	During the years ended December 31, 2014 and 2013, 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. During the year ended December 31, 2012, a derivative position designated as a cash flow hedge with a notional amount of $120 million was discontinued and a loss of $8.7 million was reclassified from AOCI into earnings as a result of the discontinuance of the cash flow hedge and the early extinguishment of related variable rate debt. As of December 31, 2014, the amount expected to be reclassified from AOCI into income during the next twelve months was $22.9 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. The Company does not offset assets and liabilities under these agreements for financial reporting purposes. Currently, there are no circumstances that would trigger these provisions of the agreements. Information on interest rate swaps subject to master netting agreements is as follows at December 31, 2014 and 2013 (in thousands):
		2014
					Gross Amounts Offset in Balance			Net Amounts Presented in			Gross Amounts Not Offset in
					Sheet			Balance Sheet			Balance Sheet
		Gross Amounts									Derivative				Collateral				Net Amount
		Recognized									Instruments				Pledged
	Derivative assets	$	4,143		$	—		$	4,143		$	(4,143	)		$	—			$	—
	Derivative liabilities	(69,117		)	—			(69,117		)	4,143				64,974				—
		$	(64,974	)	$	—		$	(64,974	)	$	—			$	64,974			$	—
		2013
					Gross Amounts Offset in Balance			Net Amounts Presented in			Gross Amounts Not Offset in
					Sheet			Balance Sheet			Balance Sheet
		Gross Amounts									Derivative				Collateral				Net Amount
		Recognized									Instruments				Pledged
	Derivative assets	$	18,015		$	—		$	18,015		$	(2,010	)		$	(14,714	)		$	1,291
	Derivative liabilities	(42,733		)	—			(42,733		)	2,010				40,723				—
		$	(24,718	)	$	—		$	(24,718	)	$	—			$	26,009			$	1,291
	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, 2014, the Company has pledged investment securities available for sale with a carrying amount of $53 million and cash on deposit of $33 million as collateral for interest rate swaps in a liability position. No financial collateral was pledged by counterparties to the Company for interest rate swaps in an asset position.  The amount of collateral required to be posted by the Company varies based on the settlement value of outstanding swaps and in some cases may include initial margin requirements.
	The Company enters into commitments to fund residential mortgage loans with the intention that these loans will subsequently be sold into the secondary market. A mortgage loan commitment binds the Company to lend funds to a potential borrower at a specified interest rate within a specified period of time, generally 30 to 75 days. These commitments are considered derivative instruments. The notional amount of outstanding mortgage loan commitment derivatives was $3 million at both December 31, 2014 and 2013. Outstanding derivative loan commitments expose the Company to the risk that the price of the loans arising from exercise of the commitments might decline from inception of the commitment to funding of the loan. To protect against the price risk inherent in derivative loan commitments, the Company utilizes “best efforts” forward loan sale commitments. Under a “best efforts” contract, the Company commits to deliver an individual mortgage loan to an investor if the loan to the underlying borrower closes. Generally, the price the investor will pay the Company for a loan is specified prior to the loan being funded. These commitments are considered derivative instruments once the underlying loans are funded.  The notional amount of forward loan sale commitment derivatives was $1.4 million and $0.2 million at December 31, 2014 and 2013, respectively. The fair value of loan commitment and forward sale commitment derivatives was nominal at December 31, 2014 and 2013.

Stockholders_Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2014
Equity [Abstract]
Stockholders' Equity	Stockholders’ Equity
	In conjunction with the acquisition of Herald, the Company issued 1,834,160 warrants to purchase its common stock to certain former shareholders of Herald. The warrants expire in November 2018. Each warrant is exercisable at an exercise price of $9.47, in exchange for which the holder is entitled to receive 0.0827 shares of BKU common stock and cash of $1.73.
	Accumulated Other Comprehensive Income
	Changes in AOCI for the years ended December 31, 2014, 2013 and 2012 are summarized as follows (in thousands):
		2014
		Before Tax			Tax Effect			Net of Tax
	Unrealized gains on investment securities available for sale:
	Net unrealized holding gain arising during the period	$	3,134		$	(1,195	)	$	1,939
	Amounts reclassified to gain on investment securities available for sale, net	(3,859		)	1,489			(2,370		)
	Net change in unrealized gains on investment securities available for sale	(725		)	294			(431		)
	Unrealized losses on derivative instruments:
	Net unrealized holding loss arising during the period	(44,086		)	17,006			(27,080		)
	Amounts reclassified to interest expense on deposits	5,675			(2,189		)	3,486
	Amounts reclassified to interest expense on borrowings	20,996			(8,099		)	12,897
	Net change in unrealized losses on derivative instruments	(17,415		)	6,718			(10,697		)
	Other comprehensive loss	$	(18,140	)	$	7,012		$	(11,128	)
		2013
		Before Tax			Tax Effect			Net of Tax
	Unrealized gains on investment securities available for sale:
	Net unrealized holding loss arising during the period	$	(64,330	)	$	24,784		$	(39,546	)
	Amounts reclassified to gain on investment securities available for sale, net	(8,629		)	3,329			(5,300		)
	Net change in unrealized gains on investment securities available for sale	(72,959		)	28,113			(44,846		)
	Unrealized losses on derivative instruments:
	Net unrealized holding gain arising during the period	8,046			(3,104		)	4,942
	Amounts reclassified to interest expense on deposits	5,140			(1,982		)	3,158
	Amounts reclassified to interest expense on borrowings	16,687			(6,437		)	10,250
	Net change in unrealized losses on derivative instruments	29,873			(11,523		)	18,350
	Other comprehensive loss	$	(43,086	)	$	16,590		$	(26,496	)
		2012
		Before Tax			Tax Effect			Net of Tax
	Unrealized gains on investment securities available for sale:
	Net unrealized holding gain arising during the period	$	112,165		$	(43,272	)	$	68,893
	Amounts reclassified to gain on investment securities available for sale, net	(17,039		)	6,573			(10,466		)
	Net change in unrealized gains on investment securities available for sale	95,126			(36,699		)	58,427
	Unrealized losses on derivative instruments:
	Net unrealized holding loss arising during the period	(14,405		)	5,557			(8,848		)
	Amounts reclassified to interest expense on deposits	4,904			(1,892		)	3,012
	Amounts reclassified to interest expense on borrowings	13,058			(5,037		)	8,021
	Amounts reclassified to loss on termination of interest rate swap	8,701			(3,356		)	5,345
	Net change in unrealized losses on derivative instruments	12,258			(4,728		)	7,530
	Other comprehensive income	$	107,384		$	(41,427	)	$	65,957
	The categories of AOCI and changes therein are presented below for the years ended December 31, 2014, 2013 and 2012 (in thousands):
		Unrealized Gains on			Unrealized Losses			Total
		Investment Securities			on Derivative
		Available for Sale			Instruments
	Balance at December 31, 2011	$	55,172		$	(37,153	)	$	18,019
	Other comprehensive income	58,427			7,530			65,957
	Balance at December 31, 2012	$	113,599		$	(29,623	)	$	83,976
	Other comprehensive loss	(44,846		)	18,350			(26,496		)
	Balance at December 31, 2013	$	68,753		$	(11,273	)	$	57,480
	Other comprehensive loss	(431		)	(10,697		)	(11,128		)
	Balance at December 31, 2014	$	68,322		$	(21,970	)	$	46,352

Equity_Based_Compensation

Equity Based Compensation	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Equity Based Compensation	Equity Based Compensation
	Description of Equity Based Compensation Plans
	In connection with the initial public offering of the Company's common stock in 2011 ("IPO"), the Company adopted the BankUnited, Inc. 2010 Omnibus Equity Incentive Plan (the "2010 Plan"). In 2014, the Board of Directors and the Company's stockholders approved the BankUnited, Inc. 2014 Omnibus Equity Incentive Plan (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, share appreciation rights ("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 589,644 shares remain available for issuance as of December 31, 2014. The number of shares of common stock available for issuance under the 2014 Plan is 4,000,000. As of December 31, 2014, the Company has not granted any share awards under the 2014 Plan. 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.
	At the time of acquisition by BankUnited, Inc., Herald had an existing stock option plan, the Heritage Bank, N.A. 2008 Stock Incentive Plan (the "Herald Plan"). Replacement options issued to employees and directors of Herald in conjunction with the acquisition were issued under the Herald Plan. No further awards are available for issuance under the Herald Plan.
	Compensation Expense Related to Equity Based Awards
	The following table summarizes compensation cost related to equity based awards for the years ended December 31, 2014, 2013 and 2012 (in thousands):
		2014				2013			2012
	Compensation cost of equity based awards:
	Unvested and restricted share awards	$	14,474			$	11,618		$	7,389
	Option awards	609				1,362			2,671
	Performance share awards	550				798			507
	Instruments issued in exchange for Profits Interest Units ("PIUs")	—				—			13,235
	Total compensation cost of equity based awards	15,633				13,778			23,802
	Related tax benefits	(5,677		)		(5,021		)	(4,887		)
	Compensation cost of equity based awards, net of tax	$	9,956			$	8,757		$	18,915
	Compensation expense for the year ended December 31, 2012 included $13.2 million related to PIUs issued to certain members of executive management. In conjunction with the IPO, the PIUs were exchanged for a combination of vested and unvested common shares and vested and unvested stock options.
	The following table summarizes total unrecognized compensation cost and the weighted average remaining period over which compensation cost will be recognized for share awards outstanding at December 31, 2014:
		Unrecognized				Weighted
		Compensation				Average
		Cost				Remaining
						Period
	Unvested and restricted share awards	$	17,359			1.91
	Performance share awards	$	1,265			2.5
	Share Awards
	Unvested share awards
	A summary of activity related to unvested share awards for the years ended December 31, 2014, 2013 and 2012 follows:
		Number of			Weighted
		Share			Average Grant
		Awards			Date Fair Value
	Unvested share awards outstanding, December 31, 2011	1,663,822			$	25.97
	Granted	885,143			23.06
	Vested	(1,268,440	)		26.28
	Canceled or forfeited	(90,629	)		24.18
	Unvested share awards outstanding, December 31, 2012	1,189,896			23.61
	Granted	109,585			28.77
	Vested	(534,363	)		24.12
	Canceled or forfeited	(58,682	)		23.61
	Unvested share awards outstanding, December 31, 2013	706,436			24.02
	Granted	699,529			31.71
	Vested	(465,476	)		24.22
	Canceled or forfeited	(111,264	)		26.51
	Unvested share awards outstanding, December 31, 2014	829,225			$	30.06
	Included in the table above are 22,913 shares granted in 2014 as employment inducement awards outside of the 2010 Plan, but subject to the same terms and conditions as awards granted under the 2010 Plan.
	Included in the table above are restricted share awards granted by the Company in 2012 which were fully vested at December 31, 2014. The restricted shares were valued at the closing price of the Company's common stock at the date of grant, less a discount for lack of marketability ("DLOM") related to post-vesting transferability restrictions. The model used to calculate the DLOM first determines an estimated volatility based on historical and implied volatility of the Company's common stock and then, utilizing the estimated volatility, calculates the DLOM using both the "protective put method" and the "Asian put method." Discounts applied in valuing restricted shares granted during 2012 ranged from 7.10% to 11.55%. The aggregate fair value of restricted shares granted was $6.2 million, net of a $0.8 million DLOM. Vested and unvested restricted shares participate in dividends declared on the Company's common stock on a one-for-one basis.
	Unvested share awards are generally valued at the closing price of the Company's common stock on the date of grant. The following table summarizes the closing price of the Company's stock on the date of grant and the aggregate grant date fair value of shares vesting during the years ended December 31, 2014, 2013 and 2012 (in thousands, except per share data):
		2014				2013			2012
	Range of the closing price on date of grant	$30.34 - $34.04				$24.53 - $30.72			$23.08 - $25.20
	Aggregate grant date fair value of shares vesting	$	11,273			$	10,714		$	31,346
	Substantially all of the shares vest in equal annual installments over a period of three years from the date of grant. Unvested shares participate in dividends declared on the Company's common stock on a one-for-one basis.
	Performance share awards
	Certain of the Company's executive officers are eligible to receive performance share awards at the end of each twelve-month performance period ending on June 30. The dollar value of share awards to be granted is based on the achievement of certain performance criteria pre-established annually by the Company's Compensation Committee. The number of performance shares 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 in the Company's consolidated balance sheets. The awards vest over varying schedules of up to three years.
	The first annual performance period ended on June 30, 2013, resulting in awards with an aggregate value of $2.0 million. The second annual performance period ended on June 30, 2014, resulting in awards with an aggregate value of $1.5 million. Based on the closing price of the Company's common stock on the date of grant, 50,099 and 66,822 share awards were granted in 2014 and 2013, respectively. These shares are included in the summary of activity related to unvested share awards above. The maximum aggregate value of performance shares that may be granted for the performance period ending June 30, 2015 is $1.5 million. As of December 31, 2014, a liability of $255 thousand related to these performance share awards was reflected in the consolidated balance sheet based on management's assessment of the probability that the defined performance criteria will be achieved and the vesting terms of the awards to be granted.
	Option Awards
	A summary of activity related to stock option awards for the years ended December 31, 2014, 2013 and 2012 follows:
		Number of			Weighted
		Option			Average
		Awards			Exercise Price
	Option awards outstanding, December 31, 2011	5,738,122			$	25.2
	Replacement options issued in conjunction with the acquisition of Herald	256,028			31.32
	Exercised	(251,120	)		14.32
	Canceled or forfeited	(44,242	)		34.31
	Option awards outstanding, December 31, 2012	5,698,788			25.89
	Exercised	(539,588	)		18.37
	Canceled or forfeited	(88,261	)		43.3
Option awards outstanding, December 31, 2013	5,070,939			26.38
Exercised	(55,423	)		16.71
Canceled or forfeited	(469	)		63.74
Option awards outstanding, December 31, 2014	5,015,047			$	26.49
Exercisable at December 31, 2014	5,015,047			$	26.49
Included in options outstanding at December 31, 2014 are 3,023,314 options exchanged for PIUs that participate in dividends on the Company's common stock on a one-for-one basis. The intrinsic value of options exercised during the years ended December 31, 2014, 2013 and 2012 was $0.9 million, $6.1 million and $2.6 million, respectively.
There were no option awards granted during the years ended December 31, 2014 and 2013. The grant-date fair value of option awards granted during the year ended December 31, 2012 was determined using a Black-Scholes option pricing model incorporating the following weighted average assumptions:
Expected volatility	35.97		%
Expected dividend yield	2.95		%
Expected term in years	1.7
Risk-free interest rate	0.27		%
Weighted average grant date fair value	$	4.7
Prior to the IPO, the Company's common stock was not traded on an exchange. Due to limited trading history in the Company's common stock, expected volatility for options granted subsequent to the IPO was estimated using both the volatility of the Company's common stock since it began trading and the volatility of peer companies. At the time these options were granted, the Company had limited exercise history related to stock option awards. Therefore, the simplified method provided for in Staff Accounting Bulletin 14 was used to estimate the expected term.
Additional information about options outstanding and exercisable at December 31, 2014 is presented in the following table:
	Outstanding and Exercisable Options
Range of Exercise Prices	Number of			Weighted		Aggregate
	Options			Average		Intrinsic
				Remaining		Value (in
				Contractual		thousands)
				Term (in
				years)
$10.00 - $13.39	54,660			4.73		$	974,588
$15.94 - $19.97	96,618			5.39		1,070,988
$21.36 - $22.31	311,583			6.69		2,080,620
$27	4,534,970			6.09		8,933,891
$63.74	17,216			3.94		—
	5,015,047			6.09		$	13,060,087
Deferred Compensation Plan
The Company has non-qualified deferred compensation plans 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 plans provide for discretionary Company contributions. Generally, the Company has elected not to make contributions; however, for a small group of employees, the Company makes contributions equal to 100% of the first 1% plus 70% of the next 5% of eligible compensation deferred. 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 $543 thousand, $373 thousand and $312 thousand for the years ended December 31, 2014, 2013 and 2012, respectively. Deferred compensation liabilities of $6 million and $2 million were included in other liabilities in the accompanying consolidated balance sheets at December 31, 2014 and 2013, respectively.
BankUnited 401(k) Plan
The Company sponsors the BankUnited 401(k) Plan, a tax-qualified, deferred compensation plan (the "401(k) Plan"). Under the terms of the 401(k) Plan, 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, 2014, 2013 and 2012, BankUnited made matching contributions to the 401(k) Plan of approximately $4.5 million, $4.1 million and $3.6 million, respectively.

Regulatory_Requirements_and_Re

Regulatory Requirements and Restrictions	12 Months Ended
	Dec. 31, 2014
Regulatory Requirements and Restrictions [Abstract]
Regulatory Requirements and Restrictions	Regulatory Requirements and Restrictions
	The Company and its banking subsidiaries 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 its banking subsidiaries 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, 2014 and 2013, all capital ratios of the Company and its banking subsidiaries 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 its banking subsidiaries to maintain minimum amounts and ratios of total 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 its banking subsidiary as of December 31, 2014 and 2013 (dollars in thousands):
		2014
		Actual				Required to be								Required to be
						Considered Well								Considered
						Capitalized								Adequately
														Capitalized
		Amount		Ratio		Amount				Ratio				Amount		Ratio
	BankUnited, Inc.:
	Tier 1 leverage	$	1,937,480	10.7	%	N/A		(1	)	N/A		(1	)	$	725,784	4	%
	Tier 1 risk-based capital	$	1,937,480	15.45	%	$	752,257			6	%			$	501,505	4	%
	Total risk based capital	$	2,039,523	16.27	%	$	1,253,761			10	%			$	1,003,009	8	%
	BankUnited:
	Tier 1 leverage	$	1,636,481	9.1	%	$	898,708			5	%			$	718,967	4	%
	Tier 1 risk-based capital	$	1,636,481	13.18	%	$	744,754			6	%			$	496,502	4	%
	Total risk based capital	$	1,736,076	13.99	%	$	1,241,256			10	%			$	993,005	8	%
		2013
		Actual				Required to be								Required to be
						Considered Well								Considered
						Capitalized								Adequately
														Capitalized
		Amount		Ratio		Amount				Ratio				Amount		Ratio
	BankUnited, Inc.:
	Tier 1 leverage	$	1,801,848	12.42	%	N/A		(1	)	N/A		(1	)	$	580,454	4	%
	Tier 1 risk-based capital	$	1,801,848	21.06	%	$	513,439			6	%			$	342,293	4	%
	Total risk based capital	$	1,876,640	21.93	%	$	855,732			10	%			$	684,586	8	%
	BankUnited:
	Tier 1 leverage	$	1,519,285	10.58	%	$	718,098			5	%			$	574,479	4	%
	Tier 1 risk-based capital	$	1,519,285	18.06	%	$	504,822			6	%			$	336,548	4	%
	Total risk based capital	$	1,592,564	18.93	%	$	841,371			10	%			$	673,097	8	%
	-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.
	On July 2, 2013 the Federal Reserve Board approved a final rule that implements the Basel III changes to the regulatory capital framework for all U.S. banking organizations. The Company is required to implement the final rule on January 1, 2015, with a phase-in period extending through January 1, 2019. The rule will add another risk-based capital category, common equity tier 1 capital, increase the required tier 1 capital level, increase risk weights for certain of the Company’s loans, other assets and off-balance sheet commitments and add some complexity to the risk-based capital calculations. In addition, a capital conservation buffer will be phased in beginning in 2016. In order to avoid limitations on capital distributions, including dividend payments and certain discretionary bonus payments to executive officers, a banking organization must hold this capital conservation buffer composed of common equity tier 1 capital above its minimum risk-based capital requirements. As of December 31, 2014, the adoption of the rule would not have impacted the Company's or the Bank's capital categories.
	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.
	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, 2014, the reserve requirement for BankUnited was $26 million.

Fair_Value_Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Fair Value Measurements	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—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, certain preferred stocks and mutual funds. 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 mortgage-backed securities, 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 mortgage-backed securities and CMOs, Re-Remics, private label commercial mortgage-backed securities, 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 mortgage-backed securities 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.
	Derivative financial instruments—Interest rate swaps are predominantly traded in over-the-counter markets and, as such, values 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. Loan commitment derivatives are priced based on a bid pricing convention adjusted based on the Company’s historical fallout rates. Fallout rates are a significant unobservable input; therefore, these fair value measurements are classified within level 3 of the fair value hierarchy. The fair value of loan commitment derivatives is nominal.
	The following tables present assets and liabilities measured at fair value on a recurring basis at December 31, 2014 and 2013 (in thousands):
		2014
		Level 1				Level 2				Level 3				Total
	Investment securities available for sale:
	U.S. Treasury securities	$	54,967			$	—			$	—			$	54,967
	U.S. Government agency and sponsored enterprise residential mortgage-backed securities	—				1,524,716				—				1,524,716
	U.S. Government agency and sponsored enterprise commercial mortgage-backed securities	—				101,858				—				101,858
	Re-Remics	—				183,272				—				183,272
	Private label residential mortgage-backed securities and CMOs	—				235,902				168,077				403,979
	Private label commercial mortgage-backed securities	—				1,139,389				—				1,139,389
	Single family rental real estate-backed securities	—				443,017				—				443,017
	Collateralized loan obligations	—				174,332				—				174,332
	Non-mortgage asset-backed securities	—				122,164				—				122,164
	Mutual funds and preferred stocks	104,754				688				—				105,442
	State and municipal obligations	—				15,702				—				15,702
	Small Business Administration securities	—				308,728				—				308,728
	Other debt securities	—				3,210				4,918				8,128
	Derivative assets	—				29,765				49				29,814
	Total assets at fair value	$	159,721			$	4,282,743			$	173,044			$	4,615,508
	Derivative liabilities	$	—			$	69,177			$	1			$	69,178
	Total liabilities at fair value	$	—			$	69,177			$	1			$	69,178
		2013
		Level 1				Level 2				Level 3				Total
	Investment securities available for sale:
	U.S. Government agency and sponsored enterprise residential mortgage-backed securities	$	—			$	1,574,303			$	—			$	1,574,303
	U.S. Government agency and sponsored enterprise commercial mortgage-backed securities	—				26,777				—				26,777
	Re-Remics	—				271,785				—				271,785
	Private label residential mortgage-backed securities and CMOs	—				110,710				199,408				310,118
	Private label commercial mortgage-backed securities	—				808,772				—				808,772
	Non-mortgage asset-backed securities	—				178,994				—				178,994
	Mutual funds and preferred stocks	149,427				250				—				149,677
	Small Business Administration securities	—				308,937				—				308,937
	Other debt securities	—				3,160				4,601				7,761
	Derivative assets	—				21,831				35				21,866
	Total assets at fair value	$	149,427			$	3,305,519			$	204,044			$	3,658,990
	Derivative liabilities	$	—			$	43,788			$	3			$	43,791
	Total liabilities at fair value	$	—			$	43,788			$	3			$	43,791
	There were no transfers of financial assets between levels of the fair value hierarchy during the years ended December 31, 2014 and 2013.
	The following tables reconcile 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 for the years ended December 31, 2014, 2013 and 2012 (in thousands):
		2014
		Private Label				Other Debt				Derivative Assets				Derivative
		Residential				Securities								Liabilities
		Mortgage-Backed
		Securities
	Balance at beginning of period	$	199,408			$	4,601			$	35			$	(3	)
	Gains (losses) for the period included in:
	Net income	—				—				14				2
	Other comprehensive income (loss)	(4,890		)		235				—				—
	Premium and discount (amortization) accretion	8,010				173				—				—
	Purchases or issuances	—				—				—				—
	Sales	(7,787		)		—				—				—
	Settlements	(26,664		)		(91		)		—				—
	Transfers into level 3	—				—				—				—
	Transfers out of level 3	—				—				—				—
	Balance at end of period	$	168,077			$	4,918			$	49			$	(1	)
		2013
		Private Label				Other Debt				Derivative Assets				Derivative
		Residential				Securities								Liabilities
		Mortgage-Backed
Securities
Balance at beginning of period	$	243,058			$	4,173			$	—			$	(29	)
Gains (losses) for the period included in:
Net income	—				—				35				26
Other comprehensive income (loss)	(2,157		)		691				—				—
Premium and discount (amortization) accretion	12,470				61				—				—
Purchases or issuances	—				—				—				—
Sales	—				—				—				—
Settlements	(53,963		)		(324		)		—				—
Transfers into level 3	—				—				—				—
Transfers out of level 3	—				—				—				—
Balance at end of period	$	199,408			$	4,601			$	35			$	(3	)
	2012
	Private Label				Non-Mortgage Asset-Backed Securities				Other Debt				Derivative
	Residential								Securities				Liabilities
	Mortgage-Backed
	Securities
Balance at beginning of period	$	387,687			$	79,870			$	3,159			$	—
Gains (losses) for the period included in:
Net income	—				—				—				(29		)
Other comprehensive income (loss)	16,629				1,482				1,234				—
Premium and discount (amortization) accretion	12,713				443				63				—
Purchases or issuances	167,300				—				—				—
Sales	—				—				—				—
Settlements	(136,244		)		(15,499		)		(283		)		—
Transfers into level 3	—				—				—				—
Transfers out of level 3	(205,027		)		(66,296		)		—				—
Balance at end of period	$	243,058			$	—			$	4,173			$	(29	)
Changes in the fair value of derivatives are included in the consolidated statement of income line item “Other non-interest income.”
Securities for which fair value measurements are categorized in level 3 of the fair value hierarchy at December 31, 2014 consisted of pooled trust preferred securities with a fair value of $5 million and private label residential mortgage-backed securities and CMOs with a fair value of $168 million. The trust preferred securities are not material to the Company’s financial statements. Private label residential mortgage-backed securities consisted of senior and mezzanine tranches collateralized by prime fixed rate and hybrid 1-4 single family residential mortgages originated before 2005, some of which contain option-arm features. Substantially all of these securities maintain variable rate coupons. Weighted average subordination levels at December 31, 2014 were 15.7%, 10.6% and 3.6% for investment grade, non-investment grade and option-arm securities, respectively. There were $27 million of option-arm securities with a subordination level of zero at December 31, 2014.
The following table provides information about the valuation techniques and unobservable inputs used in the valuation of private label residential mortgage-backed securities and CMOs falling within level 3 of the fair value hierarchy as of December 31, 2014 (dollars in thousands):
		Fair Value at				Valuation Technique		Unobservable		Range (Weighted
		31-Dec-14						Input		Average)
Investment grade		$	89,468			Discounted cash flow		Voluntary prepayment rate		0.06% - 10.96% (6.86%)
								Probability of default		0.02% - 10.62% (4.00%)
								Loss severity		0.00% - 42.40% (2.93%)
Non-investment grade		$	44,812			Discounted cash flow		Voluntary prepayment rate		0.33% - 11.57% (5.77%)
								Probability of default		0.02% - 22.99% (5.26%)
								Loss severity		0.00% - 31.08% (2.50%)
Option-arm (non-investment grade)		$	33,797			Discounted cash flow		Voluntary prepayment rate		3.69% - 3.72% (3.71%)
								Probability of default		2.76% - 2.97% (2.81%)
								Loss severity		16.84% - 32.37% (20.75%)
The significant unobservable inputs impacting the fair value measurement of private label residential mortgage-backed securities and CMOs include voluntary prepayment rates, probability of default and loss severity given default. Generally, increases in probability of default or loss severity would result in a lower fair value measurement.  Alternatively, decreases in probability of default or loss severity 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, while securities with lower levels of subordination will show a higher degree of sensitivity to changes in these unobservable inputs.  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 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. When there are price discrepancies, the final determination of fair value is based on careful consideration of the assumptions and inputs employed by each of the pricing sources.
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 and OREO - The carrying amount of collateral dependent impaired loans is typically based on the fair value of the underlying collateral, which may be real estate 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 are typically based on 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 collateral consisting of other business assets is generally based on appraisals that use market approaches to valuation incorporating primarily unobservable inputs. Fair value measurements related to collateral dependent impaired loans and OREO are classified within level 3 of the fair value hierarchy.
Mortgage Servicing Rights-Fair value is estimated using a discounted cash flow technique that incorporates market‑based assumptions including estimated prepayment speeds, contractual servicing fees, cost to service, discount rates, escrow account earnings, ancillary income, and estimated defaults. No adjustments to fair value were recognized during the years ended December 31, 2014 or 2013.
The following tables present assets for which non-recurring changes in fair value have been recorded for the years ended December 31, 2014, 2013 and 2012 (in thousands):
	2014
	Level 1				Level 2				Level 3				Total				Gains (losses) from Fair Value
																	Changes
OREO	$	—			$	—			$	10,606			$	10,606			$	(2,791	)
Impaired loans	$	—			$	—			$	11,727			$	11,727			$	2,539
	2013
	Level 1				Level 2				Level 3				Total				Gains (losses) from Fair Value
																	Changes
OREO	$	—			$	—			$	40,570			$	40,570			$	(1,939	)
Impaired loans	$	—			$	—			$	7,320			$	7,320			$	(22,865	)
	2012
	Level 1				Level 2				Level 3				Total				Gains (losses) from Fair Value
																	Changes
OREO	$	—			$	—			$	76,022			$	76,022			$	(9,926	)
Impaired loans	$	—			$	—			$	5,956			$	5,956			$	(1,600	)
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 as of December 31, 2014 and 2013 (dollars in thousands):
			2014								2013
	Level		Carrying Value				Fair Value				Carrying Value				Fair Value
Assets:
Cash and cash equivalents	1		$	187,517			$	187,517			$	252,749			$	252,749
Investment securities available for sale	1/2/03		4,585,694				4,585,694				3,637,124				3,637,124
Investment securities held to maturity	3		10,000				10,000				—				—
Non-marketable equity securities	2		191,674				191,674				152,066				152,066
Loans held for sale	2		1,399				1,445				194				197
Loans:
Covered	3		1,039,672				1,763,132				1,471,493				2,199,683
Non-covered	3		11,279,555				11,443,408				7,512,391				7,424,698
FDIC Indemnification asset	3		974,704				595,847				1,205,117				854,703
Accrued interest receivable	2		32,636				32,636				25,150				25,150
Derivative assets	3-Feb		29,814				29,814				21,866				21,866
Liabilities:
Demand, savings and money market deposits	2		$	9,509,830			$	9,509,830			$	7,250,401			$	7,250,401
Time deposits	2		4,001,925				4,017,476				3,282,027				3,303,358
FHLB advances and other borrowings	2		3,318,559				3,320,338				2,414,313				2,417,566
Accrued interest payable	2		1,997				1,997				1,643				1,643
Derivative liabilities	3-Feb		69,178				69,178				43,791				43,791
The following methods and assumptions were used to estimate the fair value of each class of financial instruments, other than those described above:
The carrying amounts of certain financial instruments approximate fair value due to their short-term nature and generally negligible credit risk. These financial instruments include cash and cash equivalents, accrued interest receivable, short-term borrowings and accrued interest payable.
Investment securities held to maturity:
Investment securities held to maturity includes one bond issued by the State of Israel, with fair value obtained from a third party pricing service.
Non-marketable equity securities:
Non-marketable equity securities include FHLB and FRB stock. There is no market for these securities, which can be liquidated only by redemption by the issuer. These securities are carried at par, which has historically represented the redemption price and is therefore considered to approximate fair value. Non-marketable equity securities are evaluated quarterly for potential impairment.
Loans held for sale:
The fair value of conforming loans originated and held for sale is based on pricing currently available to the Company in the secondary market.
ACI and non-ACI loans:
Fair values are estimated based on a discounted cash flow analysis. Estimates of future cash flows incorporate various factors that may include the type of loan and related collateral, estimated collateral values, estimated default probability and loss severity given default, internal risk rating, whether the interest rate is fixed or variable, term of loan and whether or not the loan is amortizing. The fair values of loans accounted for in pools are estimated on a pool basis. Other loans may be grouped based on risk characteristics and fair value estimated in the aggregate when applying discounted cash flow valuation techniques. Discount rates for residential loans are based on estimated yields obtained from participants active in the secondary market. Discount rates for commercial loans reflect indicative yields based on pricing obtained in the commercial loan sale in March 2014, adjusted for changes in market rates subsequent to the sale.
New loans:
Fair values of residential loans are estimated using a discounted cash flow analysis with discount rates based on yields at which similar loans are trading in the secondary market, which reflect assumptions about credit risk. Fair values of commercial and consumer loans are estimated using a discounted cash flow analysis with discount rates based on interest rates currently being offered for loans with similar terms to borrowers of similar credit quality. The ALLL related to commercial and consumer loans is considered a reasonable estimate of the required adjustment to fair value to reflect the impact of credit risk. This estimate may not represent an exit value as defined in ASC 820.
FDIC indemnification asset:
The fair value of the FDIC indemnification asset has been estimated using a discounted cash flow technique incorporating assumptions about the timing and amount of future projected cash payments from the FDIC related to the resolution of covered assets. The factors that impact estimates of future cash flows are similar to those impacting estimated cash flows from covered loans. The discount rate is determined by adjusting the risk free rate to incorporate uncertainty in the estimate of the timing and amount of future cash flows and illiquidity.
Deposits:
The fair value of demand deposits, savings accounts and money market deposits is the amount payable on demand at the reporting date. The fair value of time deposits is estimated using a discounted cash flow technique based on rates currently offered for deposits of similar remaining maturities.
Federal Home Loan Bank advances:
Fair value is estimated by discounting contractual future cash flows using the current rate at which borrowings with similar terms and remaining maturities could be obtained by the Company.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	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. Certain amounts funded under non-cancellable commitments in effect at the date of the FSB Acquisition are covered under the Single Family Shared-Loss Agreement if prescribed conditions are met.
	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. Fees collected on standby letters of credit represent the fair value of those commitments and are deferred and amortized over their term, which is typically one year or less. 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, 2014 were as follows (in thousands):
		Covered		Non-Covered		Total
	Commitments to fund loans	$	—	$	493,222	$	493,222
	Commitments to purchase loans	—		117,193		117,193
	Unfunded commitments under lines of credit	25,765		1,252,863		1,278,628
	Commercial and standby letters of credit	—		57,670		57,670
		$	25,765	$	1,920,948	$	1,946,713
	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

Condensed Financial Statements of BankUnited, Inc.	12 Months Ended
	Dec. 31, 2014
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Financial Statements of BankUnited, Inc.	Condensed Financial Statements of BankUnited, Inc.
	Condensed financial statements of BankUnited, Inc. are presented below (in thousands):
	Condensed Balance Sheets
		31-Dec-14			31-Dec-13
	Assets:
	Cash and cash equivalents	$	178,444		$	132,293
	Investment securities available for sale, at fair value	126,888			132,262
	Investment in subsidiaries	1,747,992			1,643,939
	Deferred tax asset, net	14,534			15,043
	Other assets	8,593			31,254
	Total assets	$	2,076,451		$	1,954,791
	Liabilities and Stockholders' Equity:
	Liabilities	$	23,917		$	26,093
	Stockholders' equity	2,052,534			1,928,698
	Total liabilities and stockholders' equity	$	2,076,451		$	1,954,791
	Condensed Statements of Income
		Years Ended December 31,
		2014			2013			2012
	Income:
	Interest and dividends on investment securities available for sale	$	5,560		$	5,647		$	3,890
	Service fees from subsidiaries	15,746			6,293			14,043
	Equity in earnings of subsidiaries	208,934			216,240			218,154
	Other	—			68			5,905
	Total	230,240			228,248			241,992
	Expense:
	Employee compensation and benefits	21,388			18,465			26,928
	Other	4,571			6,806			6,914
	Total	25,959			25,271			33,842
	Income before income taxes	204,281			202,977			208,150
	Provision (benefit) for income taxes	66			(5,959		)	(3,110		)
	Net income	$	204,215		$	208,936		$	211,260
	Condensed Statements of Cash Flows
		Years Ended December 31,
		2014			2013			2012
	Cash flows from operating activities:
	Net income	$	204,215		$	208,936		$	211,260
	Adjustments to reconcile net income to net cash provided by operating activities:
	Equity in undistributed earnings of subsidiaries	(116,934		)	(116,240		)	(118,154		)
	Equity based compensation	15,551			13,936			23,204
	Other	20,804			5,267			(5,529		)
	Net cash provided by operating activities	123,636			111,899			110,781
	Cash flows from investing activities:
	Capital contributions to subsidiary	—			—			(30,000		)
	Purchase of investment securities available for sale	—			—			(99,710		)
	Proceeds from repayments, sale, maturities and calls of investment securities available for sale	7,319			19,851			53,094
	Cash paid in business combination	—			—			(25,164		)
	Other	(137		)	79			(326		)
	Net cash provided by (used in) investing activities	7,182			19,930			(102,106		)
	Cash flows from financing activities:
	Dividends paid	(87,716		)	(65,225		)	(89,021		)
	Other	3,049			12,700			5,209
	Net cash used in financing activities	(84,667		)	(52,525		)	(83,812		)
	Net increase (decrease) in cash and cash equivalents	46,151			79,304			(75,137		)
	Cash and cash equivalents, beginning of period	132,293			52,989			128,126
	Cash and cash equivalents, end of period	$	178,444		$	132,293		$	52,989
	Supplemental schedule of non-cash investing and financing activities:
	Dividends declared, not paid	$	21,968		$	21,833		$	—
	Equity consideration issued in business combination	$	—		$	—		$	39,861
	BankUnited, Inc.'s investment in the Bank totaled $1.7 billion and $1.6 billion at December 31, 2014 and 2013. Dividends received by BankUnited, Inc. from the Bank totaled $92 million for the year ended December 31, 2014 and $100 million for the years ended December 31, 2013 and 2012.

Quarterly_Financial_Informatio

Quarterly Financial Information (Unaudited)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Information (Unaudited)	Quarterly Financial Information (Unaudited)
	Financial information by quarter for the years ended December 31, 2014 and 2013 follows (in thousands, except per share data:
		2014
		Fourth		Third		Second		First		Total
		Quarter		Quarter		Quarter		Quarter
	Interest income	$	200,227	$	201,222	$	191,733	$	190,562	$	783,744
	Interest expense	28,725		27,973		25,855		24,098		106,651
	Net interest income before provision for loan losses	171,502		173,249		165,878		166,464		677,093
	Provision for loan losses	20,523		5,387		7,192		8,403		41,505
	Net interest income after provision for loan losses	150,979		167,862		158,686		158,061		635,588
	Non-interest income	19,046		14,451		20,478		30,190		84,165
	Non-interest expense	108,489		108,933		106,620		102,461		426,503
	Income before income taxes	61,536		73,380		72,544		85,790		293,250
	Provision for income taxes	14,702		19,813		24,001		30,519		89,035
	Net income	$	46,834	$	53,567	$	48,543	$	55,271	$	204,215
	Earnings per common share, basic	$	0.45	$	0.51	$	0.46	$	0.53	$	1.95
	Earnings per common share, diluted	$	0.45	$	0.51	$	0.46	$	0.53	$	1.95
		2013
		Fourth		Third		Second		First		Total
		Quarter		Quarter		Quarter		Quarter
	Interest income	$	188,664	$	187,684	$	186,098	$	176,375	$	738,821
	Interest expense	24,409		23,566		22,048		22,588		92,611
	Net interest income before provision for loan losses	164,255		164,118		164,050		153,787		646,210
	Provision for loan losses	12,512		2,604		4,881		11,967		31,964
	Net interest income after provision for loan losses	151,743		161,514		159,169		141,820		614,246
	Non-interest income	21,009		13,687		13,230		20,123		68,049
	Non-interest expense	99,363		96,644		85,497		82,789		364,293
	Income before income taxes	73,389		78,557		86,902		79,154		318,002
	Provision for income taxes	20,996		24,248		32,894		30,928		109,066
	Net income	$	52,393	$	54,309	$	54,008	$	48,226	$	208,936
	Earnings per common share, basic	$	0.5	$	0.52	$	0.52	$	0.48	$	2.03
	Earnings per common share, diluted	$	0.5	$	0.52	$	0.52	$	0.47	$	2.01

Basis_of_Presentation_and_Summ1

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accounting Estimates	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 allowance for loan and lease losses ("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. Management has used information provided by third party valuation specialists to assist in the determination of the fair values of investment securities.
	Significant estimates were also made in the determination of the fair values of assets acquired and liabilities assumed in the FSB Acquisition, the most significant of which related to loans acquired with evidence of deterioration in credit quality since origination, the FDIC indemnification asset and certain investment securities.
Principles of Consolidation	Principles of Consolidation
	The consolidated financial statements include the accounts of BankUnited, Inc., its wholly-owned subsidiary and BankUnited Investment Services, Inc. ("BUIS"). BUIS was a Florida insurance agency providing wealth management and financial planning services. The operations of BUIS were discontinued in May 2013 and were not significant to the consolidated results of operations or financial position of the Company for any period presented. All significant intercompany balances and transactions have been eliminated in consolidation.
Fair Value Measurements	Fair Value Measurements
	Certain of the Company's assets and liabilities are reflected in the financial statements at fair value on either a recurring or non-recurring basis. Investment securities available for sale 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, loans held for sale, goodwill, mortgage servicing rights ("MSRs") and assets acquired and liabilities assumed in business combinations. These non-recurring fair value measurements typically involve the application of acquisition accounting, 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.
	Transfers between levels of the fair value hierarchy are recorded as of the end of the reporting period.
Cash and Cash Equivalents	Cash and Cash Equivalents
	Cash and cash equivalents include cash and due from banks, both interest bearing and non-interest bearing, amounts on deposit at the Federal Reserve Bank and federal funds sold. Cash equivalents have original maturities of three months or less.
Investment Securities	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 and marketable equity securities 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 accumulated other comprehensive income ("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 or 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. 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 other-than-temporary impairment ("OTTI") on a quarterly basis or more frequently if events and circumstances indicate that a potential impairment may have occurred. 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. 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. 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.
	The evaluation of OTTI of marketable equity securities focuses on whether evidence supports recovery of the unrealized loss within a timeframe consistent with temporary impairment. The entire amount by which cost basis exceeds the fair value of an equity security that is considered to be other-than-temporarily impaired is recognized in earnings.
Federal Reserve Bank Stock	Federal Reserve Bank Stock
	The Bank, as a member of the Federal Reserve Bank ("FRB") system, is required to maintain an investment in the stock of the FRB. No market exists for this stock, and the investment can be liquidated only through redemption by the FRB, at the discretion of and subject to conditions imposed by the FRB. The stock has no readily determinable fair value and is carried at cost.
Federal Home Loan Bank Stock	Federal Home Loan Bank Stock
	The Bank, as a member of the Federal Home Loan Bank ("FHLB") system, is required to maintain an investment in the stock of the FHLB. No market exists for this stock, and the investment can be liquidated only through redemption by the FHLB, at the discretion of and subject to conditions imposed by the FHLB. The stock has no readily determinable fair value and is carried at cost. Historically, FHLB 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	Loans Held for Sale
	Mortgage loans originated with the intent to sell in the secondary market are carried at the lower of cost or fair value, determined in the aggregate. These loans are generally sold on a non-recourse basis. Loans were generally sold with servicing released prior to March 31, 2014 and generally sold with servicing retained subsequent to that date. Gains and losses on the sale of loans recognized in earnings are measured based on the difference between proceeds received, including the value of retained servicing, and the carrying amount of the loans, inclusive of deferred origination fees and costs, if any.
	Loans not originated for sale in the secondary market and not 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	Loans
	The Company's loan portfolio contains 1-4 single family residential first mortgages, home equity loans and lines of credit, multi-family, owner and non-owner occupied commercial real estate, construction and land, commercial and industrial and consumer loans and direct financing leases. A portion of the Company's loan portfolio consists of loans acquired from the FDIC in the FSB Acquisition, the substantial majority of which are covered under the Loss Sharing Agreements. Loans covered under the Loss Sharing Agreements are referred to as covered loans. The Company segregates its loan portfolio between covered and non-covered loans. Non-covered loans include those originated or purchased since the FSB Acquisition ("new loans") and loans acquired in the FSB Acquisition for which loss share coverage has terminated. Loans acquired in the FSB Acquisition are further segregated between those acquired with evidence of deterioration in credit quality since origination (Acquired Credit Impaired or "ACI" loans) and those acquired without evidence of deterioration in credit quality since origination ("non-ACI" loans).
ACI Loans	ACI Loans
	ACI loans 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 the time of the FSB Acquisition, measured as the present value of all cash flows expected to be received, discounted at an appropriately risk-weighted 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 adjustable rate mortgages ("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 a significant 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 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.
Non-ACI Loans	Non-ACI Loans
	Loans acquired 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	Non-accrual Loans
	New commercial 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. New and non-ACI residential and consumer 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. 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. When a residential or consumer loan is returned to accrual status, interest accrued at the date the loan was placed on non-accrual status along with interest foregone during the non-accrual period are recognized as interest income. 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	Impaired Loans
	New and non-ACI 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 $750,000 that have internal risk ratings of substandard or doubtful and are on non-accrual status are individually evaluated for impairment. 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	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 troubled-debt restructuring ("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 has no history of missed payments for six months prior to the restructuring. If the borrower performs pursuant to the modified loan terms for at least six months and the remaining loan balance is considered collectible, the loan is returned to accrual status. 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	Allowance for Loan and Lease Losses
	The ALLL represents the amount considered adequate by management to absorb probable losses inherent in the loan portfolio at the balance sheet date. The ALLL relates to (i) new loans, (ii) estimated additional losses arising on non-ACI loans subsequent to the FSB Acquisition and (iii) impairment recognized as a result of decreases in expected cash flows on ACI loans due to further credit deterioration since acquisition. 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 new open- and closed-end loans secured by residential real estate and 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. 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.
	New and Non-ACI Loans
	The new residential and home equity portfolio segments have not yet developed an observable loss trend. Due to several factors, there is a lack of similarity between the risk characteristics of new loans and covered loans in the residential and home equity portfolios. Those factors include elimination of wholesale origination channels, elimination of Alt-A and no document loans, enhancements to real estate appraisal policies, elimination of option ARMs and tightening of underwriting policies. Therefore, management does not believe it is appropriate to use the historical performance of the covered residential loans as a basis for calculating the ALLL applicable to the new loans. The ALLL for new 1-4 single family residential loans is based on average annual loss rates on prime residential mortgage securitizations issued between 2003 and 2008. Loans included in these securitizations have credit characteristics, such as loan-to-value ("LTV") and FICO scores, considered by management to be comparable to characteristics of loans in the new 1-4 single family residential portfolio. The ALLL for new home equity loans is based on peer group average historical loss rates as described further below.
	Calculated loss frequency and severity percentages are applied to the UPB of non-ACI 1-4 single family residential mortgages and home equity loans and lines of credit to calculate the ALLL. Based on an analysis of historical portfolio performance, OREO and short sale data and other internal and external factors, management has concluded that historical performance by portfolio class is the best indicator of incurred loss for the non-ACI 1-4 single family residential and home equity portfolio classes. For each of these portfolio classes, a quarterly roll rate matrix is used to measure the rate at which loans move from one delinquency bucket to the next during a given quarter. An average four quarter roll rate matrix is used to estimate the amount within each delinquency bucket expected to roll to 120+ days delinquent. Loss severity given default is estimated based on internal data about short sales and OREO sales for the most recent twelve months. The ALLL calculation incorporates a 100% loss severity assumption for home equity loans and lines of credit projected to roll to 120 days delinquency.
	The credit quality of loans in the residential portfolio segment may be impacted by fluctuations in home values, unemployment, general economic conditions, borrowers' financial circumstances and fluctuations in interest rates.
	The new commercial loan portfolio has limited delinquency history and has not exhibited an observable loss trend. The credit quality of loans in this portfolio segment is impacted by general economic conditions and other factors that may influence debt service coverage generated by the borrowers' businesses as well as fluctuations in the value of real estate and other collateral. For loans evaluated individually for impairment and determined to be impaired, a specific allowance is established based on the present value of expected cash flows discounted at the loan's effective interest rate, the estimated fair value of the loan, or for collateral dependent loans, the estimated fair value of collateral less costs to sell. Loans not individually determined to be impaired are grouped based on common risk characteristics. The ALLL for these portfolio segments is based primarily on peer group average historical loss rates and the Bank's internal credit risk rating system, using a four quarter loss emergence period and a twelve quarter loss experience period. The ALLL for municipal loans and lease receivables is based on a cumulative municipal default curve for obligations of credit quality comparable to those in the Company's portfolio, using a twelve quarter loss emergence period.
	The peer group used to calculate average annual historical net charge-off rates that form the basis for the Bank's general reserves for new commercial, home equity and consumer loans is a group of 34 banks made up of the banks included in the OCC Midsize Bank Group and two additional banks in the New York region that management believes to be comparable based on size and nature of lending operations.
	Qualitative adjustments are made to the ALLL when, based on management's judgment and experience, there are internal or external factors impacting incurred losses not taken into account by the quantitative calculations. Management has categorized potential qualitative adjustments into the following categories:
	•	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;
	•	Economic factors, including unemployment rates and GDP growth rates;
	•	Changes in the value of underlying collateral for loans secured by real estate;
	•	Quality of risk ratings, as measured by changes in risk rating identified by our independent loan review function;
	•	Credit concentrations;
	•	Changes in 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 requirements.
	Revisions to ALLL inputs
	Management revised the source or determination of inputs to the ALLL methodology in 2014, as follows:
	•	The peer group used in calculating annual historical net charge-off rates used in determining general reserves for the majority of the new commercial, home equity and consumer portfolio segments was changed. Prior to 2014, a peer group of banks in the Southeast region of the U.S. was used for loans originated in the Florida market and a peer group of banks in the U.S. New York region was used for loans originated in the New York market. Management determined there was no longer a sufficient number of banks in the regional peer sets comparable to BankUnited in size and nature of lending operations.
	•	The loss experience period used to calculate average historical net charge-off rates was extended from eight to twelve quarters to include sufficient history and better capture a range of observations reflecting the performance of loans originated in the current economic cycle.
	ACI Loans
	A specific valuation allowance related to an ACI loan or pool is established when quarterly evaluations of expected cash flows indicate it is probable that the Company will be unable to collect all of the cash flows expected at acquisition plus any additional cash flows expected to be collected arising from changes in estimate after acquisition. The amount of any necessary valuation allowance is measured by comparing the carrying value of the loan or pool to the updated net present value of expected cash flows for the loan or pool. In calculating the present value of expected cash flows for this purpose, changes in cash flows related to credit related factors are isolated from those related to changes in interest rate indices or prepayment assumptions. Alternatively, an improvement in the expected cash flows related to ACI loans results in a reduction of any previously established specific allowance with a corresponding credit to the provision for loan losses. A charge-off is taken for an individual ACI commercial loan when it is deemed probable that the loan will be resolved for an amount less than its carrying value.
	Expected cash flows are estimated on a pool basis for ACI 1-4 single family residential and home equity loans. The analysis of expected pool cash flows incorporates updated pool level expected prepayment rate, default rate, delinquency level and loss severity given default assumptions. Prepayment, delinquency and default curves are derived primarily from roll rates generated from the historical performance of the portfolio over the immediately preceding four quarters. Loss severity given default is also generated from the historical performance of the portfolio over the immediately preceding four quarters. Estimates of default probability also incorporate updated LTV ratios, at the loan level, based on Case-Shiller Home Price Indices for the relevant Metropolitan Statistical Area ("MSA"). Costs and fees represent an additional component of loss on default and are projected using the "Making Home Affordable" cost factors provided by the Federal government.
	The primary assumptions underlying estimates of expected cash flows for commercial ACI loans are default probability and severity of loss given default. Generally, updated cash flow assumptions are based primarily on net realizable value analyses prepared at the individual loan level. These analyses incorporate information about loan performance, collateral values, the financial condition of the borrower and other available information that may impact sources of repayment.
	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 new 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	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, consisting of loans, OREO and certain investment securities acquired from the FDIC. 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 transferrable 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, covered investment securities 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."
Bank Owned Life Insurance	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.
Other Real Estate Owned	Other Real Estate Owned
	OREO consists of real estate assets acquired through, or in lieu of, loan foreclosure. 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 foreclosure, periodic valuations are performed and the assets are carried at the lower of the carrying amount at the date of foreclosure 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 foreclosed properties are expensed as incurred.
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets
	Goodwill of $67 million at December 31, 2014 and 2013 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 of goodwill over its implied 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.
	Intangible assets with determinable lives include core deposit intangible assets and other customer relationship intangible assets. These assets are amortized over their estimated useful lives using the straight-line method, or for certain core deposit intangible assets using an accelerated method based on an exponential attrition curve. Intangible assets with determinable lives are evaluated for impairment when events or changes in circumstances indicate the carrying amount of the assets may not be recoverable.
Equipment Under Operating Lease	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.
Premises and Equipment	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. 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 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;
	•	computer equipment - 3 to 5 years; and
	•	software and software licensing rights - 3 to 5 years.
Income Taxes	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 in the provision for income taxes.
Equity Based Compensation	Equity Based Compensation
	The Company periodically grants nonqualified stock options or unvested or restricted shares of common stock to key employees. 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. Compensation cost related to awards that embody performance conditions is recognized if it is probable that the performance condition will be achieved.
	The fair value of unvested shares is based on the closing market price of the Company's common stock at the date of grant. The value of shares granted with post-vesting restrictions as to transferability is reduced by a discount for lack of marketability. The fair value of stock options is estimated at the date of grant using a Black-Scholes option pricing model. This model requires assumptions as to expected volatility, expected term, dividend yield, and risk free interest rates. Since the Company's common stock has limited trading history, the measurement of expected volatility incorporates the volatility of the common stock of peer companies. The expected term represents the period of time that options are expected to be outstanding from the grant date and is based on the contractual term of the options and employees' anticipated exercise behavior. The risk free interest rate is based on the U.S. Treasury constant maturity rate corresponding to the expected term of the options at the date of grant. The expected dividend yield is determined based on historical dividend rates and dividends expected to be declared in the foreseeable future.
Derivative Financial Instruments and Hedging Activities	Derivative Financial Instruments and Hedging Activities
	Interest rate swap agreements
	Interest rate swaps are contracts in which a series of interest cash flows are exchanged over a prescribed period. Interest rate swaps 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 effective portion of the gain or loss on 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 ineffective portion of the gain or loss on the derivative instruments, if any, is recognized currently in earnings. Hedge effectiveness is assessed using the hypothetical derivative method. Assessments of hedge effectiveness and measurements of hedge ineffectiveness are performed quarterly.
	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 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 swaps not designated as, or not qualifying as, hedging instruments are recognized currently in earnings.
	Derivative loan commitments
	Interest rate lock commitments to originate mortgage loans to be held for sale upon funding are derivative instruments and are recognized in the consolidated balance sheets at fair value with changes in fair value reflected in earnings.
	Forward loan sale commitments
	Mandatory delivery forward loan sale commitments and best efforts forward loan sale commitments for which the loan to the underlying borrower has closed are derivative instruments and are reflected in the consolidated balance sheets at fair value with changes in fair value reflected in earnings.
Transfers of Financial Assets	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
	Advertising costs are expensed as incurred.
Earnings per Common Share	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 and stock option awards with non-forfeitable rights to dividends or dividend equivalents, whether paid or unpaid, and participating preferred stock 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 and by the dilutive effect of convertible preferred stock using the if-converted 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.
Reclassifications	Reclassifications
	Certain amounts presented for prior periods have been reclassified to conform to the current period presentation.
Recent Accounting Pronouncements	Recent Accounting Pronouncements
	In 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2014-04, Receivables—Troubled Debt Restructurings by Creditors and ASU 2014-14, Receivables-Troubled Debt Restructurings by Creditors (Subtopic 310-40) . The amendments in ASU 2014-04 clarify that an in substance repossession or foreclosure occurs, and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan, upon either (1) the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure or (2) the borrower conveying all interest in the residential real estate property to the creditor to satisfy the loan through a deed in lieu of foreclosure or other similar legal agreement. In addition, entities are required to disclose the recorded investment in residential mortgage loans for which formal foreclosure proceedings are in process. The amendments in ASU 2014-14 require that a mortgage loan be derecognized and that a separate receivable be recognized upon foreclosure if the loan has a government guarantee that is not separable from the loan before foreclosure and certain other conditions are met. The amendments in these updates are effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2014, with early adoption permitted. The Company intends to adopt these updates prospectively effective January 1, 2015. Management does not expect adoption will have a material impact on the Company's consolidated financial position, results of operations or cash flows.
	In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606), which will supersede 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, including leases and insurance 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. The amendments also require expanded disclosures concerning the nature, amount, timing and uncertainty of revenues and cash flows arising from contracts with customers. For public entities, the amendments in this update are effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period, and must be applied retrospectively. Early application is not permitted. Management is currently evaluating the impact of adoption.

Earnings_Per_Common_Share_Tabl

Earnings Per Common Share (Tables)	12 Months Ended
	Dec. 31, 2014
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, 2014, 2013 and 2012 (in thousands, except share and per share data):
	c	2014			2013				2012
	Basic earnings per common share:
	Numerator:
	Net income	$	204,215		$	208,936			$	211,260
	Preferred stock dividends	—			—				(3,899		)
	Net income available to common stockholders	204,215			208,936				207,361
	Distributed and undistributed earnings allocated to participating securities	(7,991		)	(9,380		)		(15,081		)
	Income allocated to common stockholders for basic earnings per common share	$	196,224		$	199,556			$	192,280
	Denominator:
	Weighted average common shares outstanding	101,574,076			99,587,970				94,791,484
	Less average unvested stock awards	(1,117,869		)	(1,093,930		)		(1,137,210		)
	Weighted average shares for basic earnings per common share	100,456,207			98,494,040				93,654,274
	Basic earnings per common share	$	1.95		$	2.03			$	2.05
	Diluted earnings per common share:
	Numerator:
	Income allocated to common stockholders for basic earnings per common share	$	196,224		$	199,556			$	192,280
	Adjustment for earnings reallocated from participating securities	16			1,265				20
	Income used in calculating diluted earnings per common share	$	196,240		$	200,821			$	192,300
	Denominator:
	Weighted average shares for basic earnings per common share	100,456,207			98,494,040				93,654,274
	Dilutive effect of stock options and preferred shares	139,606			1,257,565				174,509
	Weighted average shares for diluted earnings per common share	100,595,813			99,751,605				93,828,783
	Diluted earnings per common share	$	1.95		$	2.01			$	2.05
Potentially Dilutive Securities Outstanding Categorized	The following potentially dilutive securities were outstanding at December 31, 2014, 2013 and 2012, but excluded from the calculation of diluted earnings per common share for the years then ended because their inclusion would have been anti-dilutive:
			2014		2013			2012
	Unvested shares		881,693		752,609			1,248,707
	Stock options and warrants		6,386,424		6,386,815			6,950,735
	Convertible preferred shares		—		—			5,415,794

Investment_Securities_Tables

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Schedule of Available-for-sale Securities Reconciliation	Investment securities available for sale at December 31, 2014 and 2013 consisted of the following (in thousands):
		2014
		Amortized Cost			Gross Unrealized						Fair Value
					Gains			Losses
	U.S. Treasury securities	$	54,924		$	43		$	—		$	54,967
	U.S. Government agency and sponsored enterprise residential mortgage-backed securities	1,501,504			29,613			(6,401		)	1,524,716
	U.S. Government agency and sponsored enterprise commercial mortgage-backed securities	101,089			769			—			101,858
	Resecuritized real estate mortgage investment conduits (“Re-Remics”)	179,664			3,613			(5		)	183,272
	Private label residential mortgage-backed securities and collateralized mortgage obligations ("CMOs")	350,300			54,222			(543		)	403,979
	Private label commercial mortgage-backed securities	1,134,854			9,470			(4,935		)	1,139,389
	Single family rental real estate-backed securities	446,079			468			(3,530		)	443,017
	Collateralized loan obligations	174,767			—			(435		)	174,332
	Non-mortgage asset-backed securities	117,562			4,608			(6		)	122,164
	Mutual funds and preferred stocks	96,294			9,148			—			105,442
	State and municipal obligations	15,317			385			—			15,702
	Small Business Administration securities	298,424			10,540			(236		)	308,728
	Other debt securities	3,712			4,416			—			8,128
		$	4,474,490		$	127,295		$	(16,091	)	$	4,585,694
		2013
		Covered Securities												Non-Covered Securities
		Amortized Cost			Gross Unrealized						Fair Value			Amortized Cost		Gross Unrealized						Fair Value
					Gains			Losses								Gains			Losses
	U.S. Government agency and sponsored enterprise residential mortgage-backed securities	$	—		$	—		$	—		$	—		$	1,548,671	$	34,191		$	(8,559	)	$	1,574,303
	U.S. Government agency and sponsored enterprise commercial mortgage-backed securities	—			—			—			—			27,132		—			(355		)	26,777
	Re-Remics	—			—			—			—			267,525		4,261			(1		)	271,785
	Private label residential mortgage-backed securities and CMOs	119,434			56,539			(110		)	175,863			135,750		329			(1,824		)	134,255
	Private label commercial mortgage-backed securities	—			—			—			—			814,114		7,638			(12,980		)	808,772
	Non-mortgage asset-backed securities	—			—			—			—			172,329		6,676			(11		)	178,994
	Mutual funds and preferred stocks	15,419			6,726			—			22,145			125,387		4,015			(1,870		)	127,532
	Small Business Administration securities	—			—			—			—			295,892		13,045			—			308,937
	Other debt securities	3,542			4,219			—			7,761			—		—			—			—
		$	138,395		$	67,484		$	(110	)	$	205,769		$	3,386,800	$	70,155		$	(25,600	)	$	3,431,355
Investments Classified by Contractual Maturity Date	At December 31, 2014, 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	$	510,919		$	529,197
	Due after one year through five years	2,576,280			2,620,431
	Due after five years through ten years	1,028,754			1,050,596
	Due after ten years	262,243			280,028
	Mutual funds and preferred stocks with no stated maturity	96,294			105,442
		$	4,474,490		$	4,585,694
Schedule of Realized Gain (Loss)	The following table provides information about gains and losses on investment securities available for sale for the years ended December 31, 2014, 2013 and 2012 (in thousands):
		2014			2013			2012
	Proceeds from sale of investment securities available for sale	$	355,798		$	874,876		$	835,745
	Gross realized gains	$	4,987		$	11,119		$	17,338
	Gross realized losses	(1,128		)	(1,527		)	(299		)
	Net realized gain	3,859			9,592			17,039
	OTTI	—			(963		)	—
	Gain on investment securities available for sale, net	$	3,859		$	8,629		$	17,039
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	The following tables present the aggregate fair value and the aggregate amount by which amortized cost exceeded fair value for investment securities in unrealized loss positions at December 31, 2014 and 2013, aggregated by investment category and length of time that individual securities had been in continuous unrealized loss positions (in thousands):
		2014
		Less than 12 Months						12 Months or Greater						Total
		Fair Value			Unrealized Losses			Fair Value			Unrealized Losses			Fair Value		Unrealized Losses
	U.S. Government agency and sponsored enterprise residential mortgage-backed securities	$	7,058		$	(34	)	$	300,057		$	(6,367	)	$	307,115	$	(6,401	)
	Re-Remics	—			—			335			(5		)	335		(5		)
	Private label residential mortgage-backed securities and CMOs	60,076			(189		)	14,653			(354		)	74,729		(543		)
	Private label commercial mortgage-backed securities	103,900			(1,150		)	239,456			(3,785		)	343,356		(4,935		)
	Single family rental real estate-backed securities	233,012			(3,530		)	—			—			233,012		(3,530		)
	Collateralized loan obligations	49,565			(435		)	—			—			49,565		(435		)
	Non-mortgage asset-backed securities	2,796			(6		)	—			—			2,796		(6		)
	Small Business Administration securities	49,851			(236		)	—			—			49,851		(236		)
		$	506,258		$	(5,580	)	$	554,501		$	(10,511	)	$	1,060,759	$	(16,091	)
		2013
		Less than 12 Months						12 Months or Greater						Total
		Fair Value			Unrealized Losses			Fair Value			Unrealized Losses			Fair Value		Unrealized Losses
	U.S. Government agency and sponsored enterprise residential mortgage-backed securities	$	414,361		$	(8,559	)	$	—		$	—		$	414,361	$	(8,559	)
	U.S. Government agency and sponsored enterprise commercial mortgage-backed securities	26,777			(355		)	—			—			26,777		(355		)
	Re-Remics	11,037			(1		)	—			—			11,037		(1		)
	Private label residential mortgage-backed securities and CMOs	79,048			(1,696		)	10,303			(238		)	89,351		(1,934		)
	Private label commercial mortgage-backed securities	511,778			(12,980		)	—			—			511,778		(12,980		)
	Non-mortgage asset-backed securities	1,516			(11		)	—			—			1,516		(11		)
	Mutual funds and preferred stocks	67,513			(1,870		)	—			—			67,513		(1,870		)
		$	1,112,030		$	(25,472	)	$	10,303		$	(238	)	$	1,122,333	$	(25,710	)

Loans_and_Allowance_for_Loan_a1

Loans and Allowance for Loan and Lease Losses (Tables)	12 Months Ended
	Dec. 31, 2014
Receivables [Abstract]
Schedule of Loans Categorized	At December 31, 2014 and 2013, 1-4 single family residential loans outstanding were to customers domiciled in the following states (dollars in thousands)
		2014
											Percent of Total
		New Loans			Covered Loans			Total			New Loans			Total Loans
	California	$	1,045,430		$	66,105		$	1,111,535		41.4	%		32.3	%
	Florida	335,073			483,297			818,370			13.3	%		23.8	%
	New York	318,484			27,568			346,052			12.6	%		10	%
	Others	823,851			344,717			1,168,568			32.7	%		33.9	%
		$	2,522,838		$	921,687		$	3,444,525		100	%		100	%
		2013
											Percent of Total
		New Loans			Covered Loans			Total			New Loans			Total Loans
	California	$	865,342		$	80,919		$	946,261		47.3	%		32.1	%
	Florida	241,827			604,384			846,211			13.2	%		28.7	%
	New York	119,147			31,406			150,553			6.5	%		5.1	%
	Others	601,464			399,973			1,001,437			33	%		34.1	%
		$	1,827,780		$	1,116,682		$	2,944,462		100	%		100	%
	No oth
	The following table summarizes the pre-tax impact of these sales, as reflected in the consolidated statements of income for the year ended December 31, 2014 (in thousands):
	Cash proceeds, net of transaction costs	$	101,023
	Carrying value of loans transferred to loans held for sale	86,521
	Provision for loan losses recorded upon transfer to loans held for sale	(3,469		)
	Recorded investment in loans sold	83,052
	Gain on sale of covered loans	$	17,971
	Loss on FDIC indemnification	$	(2,085	)
	At December 31, 2014 and 2013, loans consisted of the following (dollars in thousands):
		2014
		Non-Covered Loans						Covered Loans										Percent of Total
		New Loans			ACI			ACI			Non-ACI				Total
	Residential:
	1-4 single family residential	$	2,486,272		$	—		$	874,522		$	56,138			$	3,416,932		27.6	%
	Home equity loans and lines of credit	1,827			—			22,657			101,142				125,626			1	%
		2,488,099			—			897,179			157,280				3,542,558			28.6	%
	Commercial:
	Multi-family	1,927,225			24,964			—			—				1,952,189			15.8	%
	Commercial real estate
	Owner occupied	1,008,930			34,440			—			—				1,043,370			8.4	%
	Non-owner occupied	1,753,317			30,762			—			—				1,784,079			14.4	%
	Construction and land	167,713			2,007			—			—				169,720			1.4	%
	Commercial and industrial	2,402,064			1,229			—			—				2,403,293			19.4	%
	Commercial finance subsidiaries	1,456,751			—			—			—				1,456,751			11.8	%
		8,716,000			93,402			—			—				8,809,402			71.2	%
	Consumer	26,293			14			—			—				26,307			0.2	%
	Total loans	11,230,392			93,416			897,179			157,280				12,378,267			100	%
	Premiums, discounts and deferred fees and costs, net	47,097			—			—			(10,595		)		36,502
	Loans net of premiums, discounts and deferred fees and costs	11,277,489			93,416			897,179			146,685				12,414,769
	Allowance for loan and lease losses	(91,350		)	—			—			(4,192		)		(95,542		)
	Loans, net	$	11,186,139		$	93,416		$	897,179		$	142,493			$	12,319,227
		2013
		Non-Covered Loans						Covered Loans										Percent of Total
		New Loans			ACI			ACI			Non-ACI				Total
	Residential:
	1-4 single family residential	$	1,800,332		$	—		$	1,057,012		$	70,378			$	2,927,722		32.4	%
	Home equity loans and lines of credit	1,535			—			39,602			127,807				168,944			1.9	%
		1,801,867			—			1,096,614			198,185				3,096,666			34.3	%
	Commercial:
	Multi-family	1,097,872			8,093			33,354			—				1,139,319			12.6	%
	Commercial real estate
	Owner occupied	712,844			5,318			49,861			689				768,712			8.5	%
	Non-owner occupied	946,543			1,449			93,089			52				1,041,133			11.5	%
	Construction and land	138,091			—			10,600			729				149,420			1.7	%
	Commercial and industrial	1,651,739			—			6,050			6,234				1,664,023			18.5	%
	Commercial finance subsidiaries	952,050			—			—			—				952,050			10.5	%
		5,499,139			14,860			192,954			7,704				5,714,657			63.3	%
Consumer	213,107			—			1,679			—				214,786			2.4	%
Total loans	7,514,113			14,860			1,291,247			205,889				9,026,109			100	%
Premiums, discounts and deferred fees and costs, net	40,748			—			—			(13,248		)		27,500
Loans net of premiums, discounts and deferred fees and costs	7,554,861			14,860			1,291,247			192,641				9,053,609
Allowance for loan and lease losses	(57,330		)	—			(2,893		)	(9,502		)		(69,725		)
Loans, net	$	7,497,531		$	14,860		$	1,288,354		$	183,139			$	8,983,884
During the years ended December 31, 2014, 2013 and 2012, the Company sold covered 1-4 single family residential loans to third parties on a non-recourse basis. The following table summarizes the impact of these transactions (in thousands):
	2014			2013			2012
UPB of loans sold	$	269,143		$	230,031		$	239,135
Cash proceeds, net of transaction costs	$	177,560		$	116,611		$	103,796
Recorded investment in loans sold	144,231			82,160			103,127
Net pre-tax impact on earnings, excluding gain (loss) on FDIC indemnification	$	33,329		$	34,451		$	669
Gain (loss) on sale of covered loans	$	2,398		$	(16,195	)	$	(29,270	)
Proceeds recorded in interest income	30,931			50,646			29,939
	$	33,329		$	34,451		$	669
Gain (loss) on FDIC indemnification	$	(809	)	$	21,021		$	30,725
Changes in the accretable yield on ACI loans for the years ended December 31, 2014, 2013 and 2012 were as follows (in thousands):
Balance, December 31, 2011	$	1,523,615
Reclassifications from non-accretable difference	206,934
Accretion	(444,483		)
Balance, December 31, 2012	1,286,066
Reclassifications from non-accretable difference	282,952
Accretion	(410,446		)
Balance, December 31, 2013	1,158,572
Reclassifications from non-accretable difference	185,604
Accretion	(338,864		)
Balance, December 31, 2014	$	1,005,312
Allowance for Credit Losses on Financing Receivables	Activity in the ALLL for the years ended December 31, 2014, 2013 and 2012 is summarized as follows (in thousands):
		2014
		Residential			Commercial			Consumer			Total
	Beginning balance	$	15,353		$	52,185		$	2,187		$	69,725
	Provision for (recovery of) loan losses:
	ACI loans	—			1,987			324			2,311
	Non-ACI loans	(1,891		)	(663		)	—			(2,554		)
	New loans	850			42,310			(1,412		)	41,748
	Total provision	(1,041		)	43,634			(1,088		)	41,505
	Charge-offs:
	ACI loans	—			(4,880		)	(324		)	(5,204		)
	Non-ACI loans	(3,006		)	(490		)	—			(3,496		)
	New loans	—			(7,671		)	(1,083		)	(8,754		)
	Total charge-offs	(3,006		)	(13,041		)	(1,407		)	(17,454		)
	Recoveries:
	Non-ACI loans	19			721			—			740
	New loans	—			528			498			1,026
	Total recoveries	19			1,249			498			1,766
	Ending balance	$	11,325		$	84,027		$	190		$	95,542
		2013
		Residential			Commercial			Consumer			Total
	Beginning balance	$	19,164		$	39,543		$	414		$	59,121
	Provision for (recovery of) loan losses:
	ACI loans	—			(2,891		)	—			(2,891		)
	Non-ACI loans	4,043			(2,890		)	—			1,153
	New loans	(3,800		)	35,368			2,134			33,702
	Total provision	243			29,587			2,134			31,964
	Charge-offs:
	ACI loans	—			(2,235		)	—			(2,235		)
	Non-ACI loans	(4,134		)	(171		)	—			(4,305		)
	New loans	(10		)	(17,987		)	(484		)	(18,481		)
	Total charge-offs	(4,144		)	(20,393		)	(484		)	(25,021		)
	Recoveries:
	Non-ACI loans	90			2,690			—			2,780
	New loans	—			758			123			881
	Total recoveries	90			3,448			123			3,661
	Ending balance	$	15,353		$	52,185		$	2,187		$	69,725
		2012
		Residential			Commercial			Consumer			Total
	Beginning balance	$	10,175		$	38,176		$	51		$	48,402
	Provision for (recovery of) loan losses:
	ACI loans	—			(4,347		)	—			(4,347		)
	Non-ACI loans	6,175			(2,331		)	—			3,844
	New loans	6,060			12,979			360			19,399
	Total provision	12,235			6,301			360			18,896
	Charge-offs:
	ACI loans	—			(3,966		)	—			(3,966		)
	Non-ACI loans	(3,275		)	(316		)	—			(3,591		)
	New loans	—			(2,929		)	—			(2,929		)
	Total charge-offs	(3,275		)	(7,211		)	—			(10,486		)
	Recoveries:
	Non-ACI loans	29			1,850			—			1,879
	New loans	—			427			3			430
	Total recoveries	29			2,277			3			2,309
	Ending balance	$	19,164		$	39,543		$	414		$	59,121
	The following table presents information about the balance of the ALLL and related loans as of December 31, 2014 and 2013 (in thousands):
		2014													2013
		Residential			Commercial			Consumer			Total				Residential			Commercial		Consumer		Total
	Allowance for loan and lease losses:
	Ending balance	$	11,325		$	84,027		$	190		$	95,542			$	15,353		$	52,185	$	2,187	$	69,725
	Ending balance: non-ACI and new loans individually evaluated for impairment	$	1,083		$	6,878		$	—		$	7,961			$	855		$	9,467	$	—	$	10,322
	Ending balance: non-ACI and new loans collectively evaluated for impairment	$	10,242		$	77,149		$	190		$	87,581			$	14,498		$	39,825	$	2,187	$	56,510
	Ending balance: ACI	$	—		$	—		$	—		$	—			$	—		$	2,893	$	—	$	2,893
	Ending balance: non-ACI	$	4,192		$	—		$	—		$	4,192			$	9,070		$	432	$	—	$	9,502
Ending balance: new loans	$	7,133		$	84,027		$	190		$	91,350			$	6,283		$	48,860	$	2,187	$	57,330
Loans:																					0
Ending balance	$	3,568,529		$	8,819,980		$	26,260		$	12,414,769			$	3,111,167		$	5,720,722	$	221,720	$	9,053,609
Ending balance: non-ACI and new loans individually evaluated for impairment	$	6,406		$	28,978		$	—		$	35,384			$	5,663		$	22,584	$	—	$	28,247
Ending balance: non-ACI and new loans collectively evaluated for impairment	$	2,664,944		$	8,697,600		$	26,246		$	11,388,790			$	2,008,890		$	5,490,324	$	220,041	$	7,719,255
Ending balance: ACI loans	$	897,179		$	93,402		$	14		$	990,595			$	1,096,614		$	207,814	$	1,679	$	1,306,107
Impaired Financing Receivables	The following table presents the average recorded investment in impaired loans for the years ended December 31, 2014, 2013 and 2012 (in thousands):
		2014									2013									2012
		New Loans			Non-ACI			ACI Loans			New Loans				Non-ACI			ACI Loans		New Loans		Non-ACI		ACI Loans
					Loans										Loans							Loans
	Residential:
	1-4 single family residential	$	—		$	3,748		$	—		$	—			$	3,891		$	—	$	—	$	2,757	$	—
	Home equity loans and lines of credit	—			2,417			—			—				1,494			—		—		119		—
		—			6,165			—			—				5,385			—		—		2,876		—
	Commercial:
	Multi-family	—			—			696			730				—			4,804		4,614		—		11,936
	Commercial real estate
	Owner occupied	2,949			—			529			—				—			3,260		—		—		5,754
	Non-owner occupied	1,385			—			6,564			2,224				—			22,883		1,291		143		36,198
	Construction and land	—			—			451			—				—			3,873		190		1,074		12,482
	Commercial and industrial	15,058			399			786			16,837				2,424			5,744		7,274		3,749		12,825
	Commercial finance subsidiaries	2,680			—			—			1,478				—			—		671		—		—
		22,072			399			9,026			21,269				2,424			40,564		14,040		4,966		79,195
		$	22,072		$	6,564		$	9,026		$	21,269			$	7,809		$	40,564	$	14,040	$	7,842	$	79,195
	The following table presents the recorded investment in new and non-ACI loans on non-accrual status as of December 31, 2014 and 2013 (in thousands):
		2014						2013
		New			Non-ACI			New			Non-ACI
		Loans			Loans			Loans			Loans
	Residential:
	1-4 single family residential	$	49		$	604		$	194		$	293
	Home equity loans and lines of credit	—			3,808			—			6,559
		49			4,412			194			6,852
	Commercial:
	Commercial real estate
	Owner occupied	3,362			—			2,785			—
	Non-owner occupied	1,326			—			1,444			52
	Construction and land	209			—			244			—
	Commercial and industrial	13,666			—			16,448			2,765
	Commercial finance subsidiaries	9,226			—			1,534			—
		27,789			—			22,455			2,817
	Consumer	173			—			75			—
		$	28,011		$	4,412		$	22,724		$	9,669
	The tables below present information about loans or ACI pools identified as impaired as of December 31, 2014 and 2013 (in thousands):
		2014									2013
		Recorded			UPB			Related			Recorded				UPB			Related
		Investment						Specific			Investment							Specific
								Allowance										Allowance
	New loans:
	With no specific allowance recorded:
	Commercial real estate
	Owner occupied	$	2,984		$	2,961		$	—		$	1,751			$	1,754		$	—
	Non-owner occupied	1,326			1,326			—			1,444				1,444			—
	Commercial and industrial	4,830			4,826			—			—				—			—
	Commercial finance subsidiaries	1,790			1,790			—			—				—			—
	With a specific allowance recorded:
	Commercial and industrial	11,152			11,157			4,054			16,048				16,055			8,696
	Commercial finance subsidiaries	6,896			6,896			2,824			1,345				1,345			771
	Total:
	Residential	$	—		$	—		$	—		$	—			$	—		$	—
	Commercial	28,978			28,956			6,878			20,588				20,598			9,467
	Consumer	—			—			—			—				—			—
		$	28,978		$	28,956		$	6,878		$	20,588			$	20,598		$	9,467
	Non-ACI loans:
	With no specific allowance recorded:
	1-4 single family residential	$	358		$	426		$	—		$	168			$	198		$	—
	Home equity loans and lines of credit	1,621			1,647			—			1,703				1,734			—
	Commercial and industrial	—			—			—			1,996				1,999			—
	With a specific allowance recorded:
	1-4 single family residential	3,493			4,158			945			3,564				4,203			827
	Home equity loans and lines of credit	934			949			138			228				232			28
Total:
Residential	$	6,406		$	7,180		$	1,083		$	5,663			$	6,367		$	855
Commercial	—			—			—			1,996				1,999			—
	$	6,406		$	7,180		$	1,083		$	7,659			$	8,366		$	855
ACI loans:
With no specific allowance recorded:
Commercial real estate
Non-owner occupied	$	—		$	—		$	—		$	384			$	406		$	—
Construction and land	—			—			—			567				588			—
With a specific allowance recorded:
Multi-family	—			—			—			3,478				3,459			323
Commercial real estate
Owner occupied	—			—			—			2,643				2,812			369
Non-owner occupied	—			—			—			32,436				37,392			1,444
Construction and land	—			—			—			1,686				1,500			192
Commercial and industrial	—			—			—			3,932				4,262			565
	$	—		$	—		$	—		$	45,126			$	50,419		$	2,893
Financing Receivable Credit Quality Indicators	The following tables summarize key indicators of credit quality for the Company's loans as of December 31, 2014 and 2013. Amounts are net of premiums, discounts and deferred fees and costs (in thousands):
	1-4 Single Family Residential credit exposure for new loans, based on original LTV and FICO score:
			2014
			FICO
	LTV		720 or less			721 - 740			741 - 760			761 or				Total
												greater
	60% or less		$	64,590		$	79,518		$	128,115		$	596,843			$	869,066
	60% - 70%		55,075			63,642			102,054			424,487				645,258
	70% - 80%		43,316			98,052			170,305			650,165				961,838
	More than 80%		28,218			3,261			3,450			11,747				46,676
			$	191,199		$	244,473		$	403,924		$	1,683,242			$	2,522,838
			2013
			FICO
	LTV		720 or less			721 - 740			741 - 760			761 or				Total
												greater
	60% or less		$	37,293		$	60,626		$	86,920		$	473,250			$	658,089
	60% - 70%		25,861			45,485			77,253			308,242				456,841
	70% - 80%		19,610			60,021			116,332			472,279				668,242
	More than 80%		26,492			5,487			3,166			9,463				44,608
			$	109,256		$	171,619		$	283,671		$	1,263,234			$	1,827,780
	Commercial credit exposure, based on internal risk rating:
		2014
					Commercial Real Estate
		Multi-Family			Owner Occupied			Non-Owner Occupied			Construction				Commercial			Commercial Finance Subsidiaries		Total
											and Land				and
															Industrial
	New loans:
	Pass	$	1,930,324		$	995,062		$	1,750,753		$	166,929			$	2,364,792		$	1,441,670	$	8,649,530
	Special mention	—			8,303			—			—				9,165			7,155		24,623
	Substandard	408			6,426			1,326			209				21,501			11,044		40,914
	Doubtful	—			—			—			—				5,121			6,390		11,511
		$	1,930,732		$	1,009,791		$	1,752,079		$	167,138			$	2,400,579		$	1,466,259	$	8,726,578
	ACI loans:
	Pass	$	22,762		$	34,440		$	30,101		$	2,007			$	1,156		$	—	$	90,466
	Special mention	—			—			509			—				—			—		509
	Substandard	2,202			—			152			—				67			—		2,421
	Doubtful	—			—			—			—				6			—		6
		$	24,964		$	34,440		$	30,762		$	2,007			$	1,229		$	—	$	93,402
		2013
					Commercial Real Estate
		Multi-Family			Owner Occupied			Non-Owner Occupied			Construction				Commercial			Commercial Finance Subsidiaries		Total
											and Land				and
															Industrial
	New loans:
	Pass	$	1,098,383		$	704,403		$	946,208		$	137,513			$	1,624,492		$	950,831	$	5,461,830
	Special mention	—			—			—			—				3,513			4,379		7,892
	Substandard	770			7,080			1,444			244				15,672			833		26,043
	Doubtful	—			51			—			—				8,918			771		9,740
		$	1,099,153		$	711,534		$	947,652		$	137,757			$	1,652,595		$	956,814	$	5,505,505
	Non-ACI loans:
	Pass	$	—		$	687		$	—		$	688			$	3,177		$	—	$	4,552
	Substandard	—			—			52			—				2,379			—		2,431
	Doubtful	—			—			—			—				420			—		420
		$	—		$	687		$	52		$	688			$	5,976		$	—	$	7,403
	ACI loans:
	Pass	$	31,002		$	40,725		$	53,238		$	7,373			$	1,824		$	—	$	134,162
	Special mention	—			1,000			3,361			—				—			—		4,361
	Substandard	10,445			13,454			37,845			3,227				4,206			—		69,177
	Doubtful	—			—			94			—				20			—		114
		$	41,447		$	55,179		$	94,538		$	10,600			$	6,050		$	—	$	207,814
Schedule of Past Due Financing Receivables	The following table presents an aging of loans as of December 31, 2014 and 2013. Amounts are net of premiums, discounts and deferred fees and costs (in thousands):
		2014																2013
		Current			30 - 59			60 - 89			90 Days or				Total			Current		30 - 59		60 - 89		90 Days or		Total
					Days Past			Days Past			More Past									Days Past		Days Past		More Past
					Due			Due			Due or in									Due		Due		Due or in
											Foreclosure													Foreclosure
	New loans:
	1-4 single family residential	$	2,518,357		$	4,432		$	—		$	49			$	2,522,838		$	1,824,084	$	2,990	$	109	$	597	$	1,827,780
	Home equity loans and lines of credit	1,827			—			—			—				1,827			1,535		—		—		—		1,535
	Multi-family	1,929,546			1,186			—			—				1,930,732			1,099,153		—		—		—		1,099,153
	Commercial real estate
	Owner occupied	1,008,576			836			—			379				1,009,791			710,938		—		—		596		711,534
	Non-owner occupied	1,752,079			—			—			—				1,752,079			947,652		—		—		—		947,652
	Construction and land	167,138			—			—			—				167,138			137,757		—		—		—		137,757
	Commercial and industrial	2,396,549			1,696			327			2,007				2,400,579			1,644,292		494		165		7,644		1,652,595
	Commercial finance subsidiaries	1,458,890			5,208			246			1,915				1,466,259			956,673		116		25		—		956,814
	Consumer	26,116			2			10			118				26,246			219,083		766		161		31		220,041
		$	11,259,078		$	13,360		$	583		$	4,468			$	11,277,489		$	7,541,167	$	4,366	$	460	$	8,868	$	7,554,861
	Non-ACI loans:
	1-4 single family residential	$	45,959		$	602		$	563		$	41			$	47,165		$	56,248	$	3,129	$	293	$	—	$	59,670
	Home equity loans and lines of credit	93,427			1,739			546			3,808				99,520			116,036		2,417		556		6,559		125,568
	Commercial real estate
	Owner occupied	—			—			—			—				—			687		—		—		—		687
	Non-owner occupied	—			—			—			—				—			52		—		—		—		52
	Construction and land	—			—			—			—				—			688		—		—		—		688
	Commercial and industrial	—			—			—			—				—			3,722		—		4		2,250		5,976
		$	139,386		$	2,341		$	1,109		$	3,849			$	146,685		$	177,433	$	5,546	$	853	$	8,809	$	192,641
	ACI loans:
	1-4 single family residential	$	829,412		$	18,463		$	4,689		$	21,958			$	874,522		$	957,791	$	33,067	$	10,279	$	55,875	$	1,057,012
	Home equity loans and lines of credit	20,474			558			125			1,500				22,657			33,967		1,150		329		4,156		39,602
	Multi-family	24,964			—			—			—				24,964			38,877		—		—		2,570		41,447
	Commercial real estate
	Owner occupied	34,440			—			—			—				34,440			54,501		253		—		425		55,179
	Non-owner occupied	30,746			9			—			7				30,762			81,754		3,245		—		9,539		94,538
	Construction and land	2,007			—			—			—				2,007			7,373		—		—		3,227		10,600
	Commercial and industrial	1,196			3			—			30				1,229			3,193		—		—		2,857		6,050
	Consumer	14			—			—			—				14			1,477		—		201		1		1,679
		$	943,253		$	19,033		$	4,814		$	23,495			$	990,595		$	1,178,933	$	37,715	$	10,809	$	78,650	$	1,306,107
	1

FDIC_Indemnification_Asset_Tab

FDIC Indemnification Asset (Tables)	12 Months Ended
	Dec. 31, 2014
FDIC Indemnification Asset [Abstract]
Summary of the Gains and Losses Associated with Covered Assets	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, 2014, 2013 and 2012 (in thousands):
		2014
		Transaction				Net Loss on FDIC			Net Impact
		Income				Indemnification			on Pre-tax
									Earnings
	Recovery of losses on covered loans (1)	$	33			$	(54	)	$	(21	)
	Income from resolution of covered assets, net	49,082				(39,127		)	9,955
	Gain on sale of covered loans	20,369				(5,338		)	15,031
	Gain on covered investment securities available for sale	209				(167		)	42
	Gain on covered OREO	2,744				(1,710		)	1,034
		$	72,437			$	(46,396	)	$	26,041
	-1	Transaction income includes provisions of $210 related to unfunded loan commitments included in other non-interest expense in the accompanying consolidated income statement.
		2013
		Transaction				Net Loss on FDIC			Net Impact
		Income (Loss)				Indemnification			on Pre-tax
									Earnings
	Recovery of losses on covered loans	$	1,738			$	(1,574	)	$	164
	Income from resolution of covered assets, net	78,862				(64,793		)	14,069
	Loss on sale of covered loans	(16,195		)		21,021			4,826
	Loss on covered investment securities available for sale	(963		)		770			(193		)
	Gain on covered OREO	7,629				(6,062		)	1,567
		$	71,071			$	(50,638	)	$	20,433
		2012
		Transaction				Net Loss on FDIC			Net Impact
		Income (Loss)				Indemnification			on Pre-tax
									Earnings
	Recovery of losses on covered loans	$	503			$	344		$	847
	Income from resolution of covered assets, net	51,016				(41,962		)	9,054
	Loss on sale of covered loans	(29,270		)		30,725			1,455
	Loss on covered OREO	(5,762		)		4,863			(899		)
		$	16,487			$	(6,030	)	$	10,457
Changes in the FDIC Indemnification Asset	Changes in the FDIC indemnification asset and in the liability to the FDIC for recoveries related to assets previously covered under the Commercial Shared-Loss Agreement for the years ended December 31, 2014, 2013 and 2012, were as follows (in thousands):
	Balance at December 31, 2011		$	2,049,151
	Accretion		15,306
	Reduction for claims filed		(600,857		)
	Net loss on FDIC indemnification		(6,030		)
	Balance at December 31, 2012		1,457,570
	Amortization		(36,943		)
	Reduction for claims filed		(164,872		)
	Net loss on FDIC indemnification		(50,638		)
	Balance at December 31, 2013		1,205,117
	Amortization		(69,470		)
	Reduction for claims filed		(114,916		)
	Net loss on FDIC indemnification		(46,396		)
	Balance at December 31, 2014		$	974,335
FDIC Asset and Liability	The balance at December 31, 2014 is reflected in the consolidated balance sheet as follows (in thousands):
	FDIC indemnification asset		$	974,704
	Other liabilities		(369		)
			$	974,335

Equipment_Under_Operating_Leas1

Equipment Under Operating Lease (Tables)	12 Months Ended
	Dec. 31, 2014
Leases [Abstract]
Schedule of Property Subject to or Available for Operating Lease	Equipment under operating lease consists of rail cars. The components of equipment under operating lease as of December 31, 2014 and 2013 are summarized as follows (in thousands):
		2014			2013
	Equipment under operating lease	$	324,295		$	201,163
	Less: accumulated depreciation	(9,737		)	(4,680		)
	Equipment under operating lease, net	$	314,558		$	196,483
Schedule of Future Minimum Rental Payments for Operating Leases	At December 31, 2014, scheduled minimum rental payments under operating leases were as follows (in thousands):
	Years Ending December 31:
	2015	$	23,902
	2016	23,792
	2017	21,583
	2018	18,992
	2019	16,511
	Thereafter through 2024	24,243
		$	129,023

Other_Real_Estate_Owned_Tables

Other Real Estate Owned (Tables)	12 Months Ended
	Dec. 31, 2014
Other Real Estate [Abstract]
Other Real Estate, Roll Forward	An analysis of OREO activity for the years ended December 31, 2014, 2013 and 2012 follows (in thousands):
		2014			2013			2012
	Balance, beginning of period	$	40,570		$	76,022		$	123,737
	Transfers from loan portfolio	26,564			68,084			151,302
	Sales	(52,119		)	(101,597		)	(189,091		)
	Impairment	(1,235		)	(1,939		)	(9,926		)
	Balance, end of period	$	13,780		$	40,570		$	76,022

Premises_and_Equipment_and_Lea1

Premises and Equipment and Lease Commitments (Tables)	12 Months Ended
	Dec. 31, 2014
Premises and Equipment and Lease Commitments [Abstract]
Property, Plant and Equipment	Premises and equipment are included in other assets in the accompanying consolidated balance sheets and are summarized as follows as of December 31, 2014 and 2013 (in thousands):
		2014			2013
	Buildings and improvements	$	25,739		$	18,049
	Leasehold improvements	61,336			47,912
	Construction in progress	149			3,293
	Furniture, fixtures and equipment	34,542			29,880
	Computer equipment	13,555			11,212
	Software and software licensing rights	31,672			26,855
		166,993			137,201
	Less: accumulated depreciation	(61,808		)	(42,923		)
	Premises and equipment, net	$	105,185		$	94,278
Operating Leases of Lessee Disclosure	As of December 31, 2014, 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:
	2015	$	20,834
	2016	20,350
	2017	20,188
	2018	18,989
	2019	17,383
	Thereafter through 2034	81,756
		$	179,500

Deposits_Tables

Deposits (Tables)	12 Months Ended
	Dec. 31, 2014
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, 2014, 2013 and 2012 (dollars in thousands):
		2014				2013					2012
		Average		Average		Average			Average		Average		Average
		Balance		Rate		Balance			Rate		Balance		Rate
				Paid					Paid				Paid
	Demand deposits:
	Non-interest bearing	$	2,366,621	—	%	$	1,586,007		—	%	$	1,099,448	—	%
	Interest bearing	773,655		0.42	%	582,623			0.46	%	504,614		0.63	%
	Money market	4,444,753		0.54	%	3,403,276			0.51	%	2,838,735		0.63	%
	Savings	647,691		0.3	%	877,255			0.37	%	1,073,709		0.58	%
	Time	3,716,611		1.18	%	2,844,377			1.31	%	2,632,451		1.48	%
		$	11,949,331	0.61	%	$	9,293,538		0.65	%	$	8,148,957	0.81	%
Schedule of Maturities of Time Deposits with Balances Equal or Greater than $100,000	The following table presents maturities of time deposits as of December 31, 2014 (in thousands):
	Maturing in:
	2015	$	3,205,042
	2016	478,714
	2017	289,236
	2018	11,023
	2019	17,774
	Thereafter through 2023	136
		$	4,001,925
Schedule of Interest Expense on Deposits	Interest expense on deposits for the years ended December 31, 2014, 2013 and 2012 was as follows (in thousands):
		2014		2013			2012
	Interest bearing demand	$	3,254	$	2,698		$	3,155
	Money market	23,944		17,355			17,878
	Savings	1,971		3,265			6,215
	Time	43,792		37,248			38,930
		$	72,961	$	60,566		$	66,178

Federal_Home_Loan_Bank_Advance1

Federal Home Loan Bank Advances and Other Borrowings (Tables)	12 Months Ended
	Dec. 31, 2014
Advances from Federal Home Loan Banks [Abstract]
Schedule of Federal Home Loan Bank, Advances, by Branch of FHLB Bank	At December 31, 2014 and 2013 outstanding FHLB advances and other borrowings consisted of the following (dollars in thousands):
		2014			2013
	FHLB advances	$	3,307,932		$	2,412,050
	Securities sold under agreements to repurchase	—			346
	Capital lease obligations	10,627			1,917
		$	3,318,559		$	2,414,313
	nformation about outstanding FHLB advances as of December 31, 2014 (dollars in thousands):
					Range of Interest Rates
									Weighted
		Amount			Minimum		Maximum		Average Rate
	Maturing in:
	2015—31 days or less	$	525,000		0.17	%	0.26	%	0.22	%
	2015—Over 31 days	2,080,350			—	%	0.79	%	0.31	%
	2016	450,000			0.51	%	0.79	%	0.63	%
	2017	255,000			0.95	%	1.31	%	1.05	%
	Total contractual balance outstanding	3,310,350
	Unamortized modification costs	(2,418		)
	Carrying value	$	3,307,932

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Expense (Benefit)	The components of the provision for income taxes for the years ended December 31, 2014, 2013 and 2012 were as follows (in thousands):
		2014			2013				2012
	Current:
	Federal	$	121,063		$	94,724			$	170,973
	State	7,549			6,105				34,860
		128,612			100,829				205,833
	Deferred:
	Federal	(27,468		)	5,028				(60,985		)
	State	(12,109		)	3,209				(11,243		)
		(39,577		)	8,237				(72,228		)
		$	89,035		$	109,066			$	133,605
Schedule of Effective Income Tax Rate Reconciliation	A reconciliation of expected income tax expense at the statutory federal income tax rate of 35% to the Company’s effective income tax rate for the years ended December 31, 2014, 2013 and 2012 follows (dollars in thousands):
		2014						2013						2012
		Amount			Percent			Amount				Percent		Amount			Percent
	Tax expense calculated at the statutory federal income tax rate	$	102,637		35	%		$	111,301			35	%	$	120,703		35	%
	Increases (decreases) resulting from:
	Income not subject to tax	(10,056		)	(3.43	)%		(7,065		)		(2.22	)%	(6,019		)	(1.75	)%
	State income taxes, net of federal tax benefit	6,259			2.13	%		9,896				3.11	%	12,967			3.76	%
	Uncertain tax positions - lapse of statute of limitations	(5,098		)	(1.74	)%		(3,597		)		(1.13	)%	—			—	%
	Other, net	(4,707		)	(1.60	)%		(1,469		)		(0.46	)%	5,954			1.73	%
		89,035			30.36	%		109,066				34.3	%	133,605			38.74	%
Schedule of Deferred Tax Assets and Liabilities	The components of deferred tax assets and liabilities at December 31, 2014 and 2013 were as follows (in thousands):
		2014			2013
	Deferred tax assets:
	Excess of tax basis over carrying value of acquired loans	$	152,870		$	199,715
	Allowance for loan and lease losses	37,091			26,639
	Acquisition costs	11,257			12,119
	Net operating loss and tax credit carryforwards	10,525			6,894
	Net unrealized losses on derivatives designated as cash flow hedges	13,836			7,080
	Other	21,171			19,210
	Gross deferred tax assets	246,750			271,657
	Deferred tax liabilities:
	Deferred tax gain resulting from the FSB Acquisition	—			107,512
	Net unrealized gains on investment securities available for sale	43,123			43,177
	Lease financing, due to differences in depreciation	71,024			34,624
	Premises and equipment, due to differences in depreciation	8,851			10,457
	Other	6,537			5,261
	Gross deferred tax liabilities	129,535			201,031
	Net deferred tax asset	$	117,215		$	70,626
Schedule of Unrecognized Tax Benefits Roll Forward	A reconciliation of the beginning and ending amount of gross unrecognized tax benefits for the years ended December 31, 2014, 2013 and 2012 follows (in thousands):
		2014			2013				2012
	Balance, beginning of period	$	21,898		$	24,790			$	20,961
	Additions for tax positions related to the current year	3,797			699				1,246
	Additions for tax positions related to prior periods	22,089			—				—
	Reductions due to settlements with taxing authorities	(3,807		)	—				(41		)
	Reductions due to lapse of the statute of limitations	(4,739		)	(3,340		)		—
		39,238			22,149				22,166
	Interest and penalties	(2,616		)	(251		)		2,624
	Balance, end of period	$	36,622		$	21,898			$	24,790

Derivatives_and_Hedging_Activi1

Derivatives and Hedging Activities (Tables)	12 Months Ended
	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Interest Rate Contract Derivative Financial Instruments and Related Hedged Items	The following tables set forth certain information concerning the Company’s interest rate contract derivative financial instruments and related hedged items at December 31, 2014 and 2013 (dollars in thousands):
		2014
				Weighted	Weighted		Weighted
				Average Pay Rate	Average Receive Rate		Average
							Remaining	Notional Amount			Balance Sheet Location		Fair value
		Hedged Item					Life in Years						Asset				Liability
	Derivatives designated as cash flow hedges:
	Pay-fixed interest rate swaps	Variability of interest cash flows on certificates of deposit		3.11%	12-Month Libor		0.8	$	225,000		Other liabilities		$	—			$	(5,741	)
	Pay-fixed interest rate swaps	Variability of interest cash flows on variable rate borrowings		1.61%	3-Month Libor		2.8	1,505,000			Other assets / Other liabilities		4,083				(19,639		)
	Pay-fixed forward-starting interest rate swaps	Variability of interest cash flows on variable rate borrowings		3.43%	3-Month Libor		12.5	300,000			Other assets / Other liabilities		—				(18,115		)
	Derivatives not designated as hedges:
	Pay-fixed interest rate swaps and caps			4.34%	Indexed to 1-month Libor		6.3	537,368			Other assets / Other liabilities		60				(25,622		)
	Pay-variable interest rate swaps and caps			Indexed to 1-month Libor	4.34%		6.3	537,368			Other assets / Other liabilities		25,622				(60		)
								$	3,104,736				$	29,765			$	(69,177	)
		2013
				Weighted	Weighted		Weighted
				Average Pay Rate	Average Receive Rate		Average
							Remaining	Notional Amount			Balance Sheet Location		Fair value
		Hedged Item					Life in Years						Asset				Liability
	Derivatives designated as cash flow hedges:
	Pay-fixed interest rate swaps	Variability of interest cash flows on certificates of deposit		3.11%	12-Month Libor		1.9	$	225,000		Other liabilities		$	—			$	(10,591	)
	Pay-fixed interest rate swaps	Variability of interest cash flows on variable rate borrowings		1.61%	3-Month Libor		3.8	1,505,000			Other assets / Other liabilities		16,960				(28,326		)
	Derivatives not designated as hedges:
	Pay-fixed interest rate swaps and caps			4.62%	Indexed to 1-month Libor		6.4	283,751			Other assets / Other liabilities		1,055				(3,816		)
	Pay-variable interest rate swaps and caps			Indexed to 1-month Libor	4.62%		6.4	283,751			Other assets / Other liabilities		3,816				(1,055		)
								$	2,297,502				$	21,831			$	(43,788	)
Schedule of Gains and Losses Related to Interest Rate Contract Derivative Instruments	The following table provides information about gains and losses related to interest rate contract derivative instruments designated as cash flow hedges for the years ended December 31, 2014, 2013 and 2012 (in thousands):
		2014			2013			2012
	Amount of loss reclassified from AOCI into interest expense during the period (effective portion)	$	(26,671	)	$	(21,827	)	$	(17,962	)
	Amount of loss related to termination of cash flow hedges reclassified from AOCI into non-interest income during the period	$	—		$	—		$	(8,701	)
	Amount of gain (loss) recognized in income during the period (ineffective portion)	$	—		$	—		$	—
Schedule of Interest Rate Swaps Subject to Master Netting Agreements	Information on interest rate swaps subject to master netting agreements is as follows at December 31, 2014 and 2013 (in thousands):
		2014
					Gross Amounts Offset in Balance			Net Amounts Presented in			Gross Amounts Not Offset in
					Sheet			Balance Sheet			Balance Sheet
		Gross Amounts									Derivative				Collateral				Net Amount
		Recognized									Instruments				Pledged
	Derivative assets	$	4,143		$	—		$	4,143		$	(4,143	)		$	—			$	—
	Derivative liabilities	(69,117		)	—			(69,117		)	4,143				64,974				—
		$	(64,974	)	$	—		$	(64,974	)	$	—			$	64,974			$	—
		2013
					Gross Amounts Offset in Balance			Net Amounts Presented in			Gross Amounts Not Offset in
					Sheet			Balance Sheet			Balance Sheet
		Gross Amounts									Derivative				Collateral				Net Amount
		Recognized									Instruments				Pledged
	Derivative assets	$	18,015		$	—		$	18,015		$	(2,010	)		$	(14,714	)		$	1,291
	Derivative liabilities	(42,733		)	—			(42,733		)	2,010				40,723				—
		$	(24,718	)	$	—		$	(24,718	)	$	—			$	26,009			$	1,291

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2014
Equity [Abstract]
Schedule of Changes in AOCI	Changes in AOCI for the years ended December 31, 2014, 2013 and 2012 are summarized as follows (in thousands):
		2014
		Before Tax			Tax Effect			Net of Tax
	Unrealized gains on investment securities available for sale:
	Net unrealized holding gain arising during the period	$	3,134		$	(1,195	)	$	1,939
	Amounts reclassified to gain on investment securities available for sale, net	(3,859		)	1,489			(2,370		)
	Net change in unrealized gains on investment securities available for sale	(725		)	294			(431		)
	Unrealized losses on derivative instruments:
	Net unrealized holding loss arising during the period	(44,086		)	17,006			(27,080		)
	Amounts reclassified to interest expense on deposits	5,675			(2,189		)	3,486
	Amounts reclassified to interest expense on borrowings	20,996			(8,099		)	12,897
	Net change in unrealized losses on derivative instruments	(17,415		)	6,718			(10,697		)
	Other comprehensive loss	$	(18,140	)	$	7,012		$	(11,128	)
		2013
		Before Tax			Tax Effect			Net of Tax
	Unrealized gains on investment securities available for sale:
	Net unrealized holding loss arising during the period	$	(64,330	)	$	24,784		$	(39,546	)
	Amounts reclassified to gain on investment securities available for sale, net	(8,629		)	3,329			(5,300		)
	Net change in unrealized gains on investment securities available for sale	(72,959		)	28,113			(44,846		)
	Unrealized losses on derivative instruments:
	Net unrealized holding gain arising during the period	8,046			(3,104		)	4,942
	Amounts reclassified to interest expense on deposits	5,140			(1,982		)	3,158
	Amounts reclassified to interest expense on borrowings	16,687			(6,437		)	10,250
	Net change in unrealized losses on derivative instruments	29,873			(11,523		)	18,350
	Other comprehensive loss	$	(43,086	)	$	16,590		$	(26,496	)
		2012
		Before Tax			Tax Effect			Net of Tax
	Unrealized gains on investment securities available for sale:
	Net unrealized holding gain arising during the period	$	112,165		$	(43,272	)	$	68,893
	Amounts reclassified to gain on investment securities available for sale, net	(17,039		)	6,573			(10,466		)
	Net change in unrealized gains on investment securities available for sale	95,126			(36,699		)	58,427
	Unrealized losses on derivative instruments:
	Net unrealized holding loss arising during the period	(14,405		)	5,557			(8,848		)
	Amounts reclassified to interest expense on deposits	4,904			(1,892		)	3,012
	Amounts reclassified to interest expense on borrowings	13,058			(5,037		)	8,021
	Amounts reclassified to loss on termination of interest rate swap	8,701			(3,356		)	5,345
	Net change in unrealized losses on derivative instruments	12,258			(4,728		)	7,530
	Other comprehensive income	$	107,384		$	(41,427	)	$	65,957
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, 2014, 2013 and 2012 (in thousands):
		Unrealized Gains on			Unrealized Losses			Total
		Investment Securities			on Derivative
		Available for Sale			Instruments
	Balance at December 31, 2011	$	55,172		$	(37,153	)	$	18,019
	Other comprehensive income	58,427			7,530			65,957
	Balance at December 31, 2012	$	113,599		$	(29,623	)	$	83,976
	Other comprehensive loss	(44,846		)	18,350			(26,496		)
	Balance at December 31, 2013	$	68,753		$	(11,273	)	$	57,480
	Other comprehensive loss	(431		)	(10,697		)	(11,128		)
	Balance at December 31, 2014	$	68,322		$	(21,970	)	$	46,352

Equity_Based_Compensation_Tabl

Equity Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award	The following table summarizes compensation cost related to equity based awards for the years ended December 31, 2014, 2013 and 2012 (in thousands):
		2014				2013			2012
	Compensation cost of equity based awards:
	Unvested and restricted share awards	$	14,474			$	11,618		$	7,389
	Option awards	609				1,362			2,671
	Performance share awards	550				798			507
	Instruments issued in exchange for Profits Interest Units ("PIUs")	—				—			13,235
	Total compensation cost of equity based awards	15,633				13,778			23,802
	Related tax benefits	(5,677		)		(5,021		)	(4,887		)
	Compensation cost of equity based awards, net of tax	$	9,956			$	8,757		$	18,915
Schedule of Unrecognized Compensation Cost, Nonvested Awards	The following table summarizes total unrecognized compensation cost and the weighted average remaining period over which compensation cost will be recognized for share awards outstanding at December 31, 2014:
		Unrecognized				Weighted
		Compensation				Average
		Cost				Remaining
						Period
	Unvested and restricted share awards	$	17,359			1.91
	Performance share awards	$	1,265			2.5
Schedule of Nonvested Share Activity	A summary of activity related to unvested share awards for the years ended December 31, 2014, 2013 and 2012 follows:
		Number of			Weighted
		Share			Average Grant
		Awards			Date Fair Value
	Unvested share awards outstanding, December 31, 2011	1,663,822			$	25.97
	Granted	885,143			23.06
	Vested	(1,268,440	)		26.28
	Canceled or forfeited	(90,629	)		24.18
	Unvested share awards outstanding, December 31, 2012	1,189,896			23.61
	Granted	109,585			28.77
	Vested	(534,363	)		24.12
	Canceled or forfeited	(58,682	)		23.61
	Unvested share awards outstanding, December 31, 2013	706,436			24.02
	Granted	699,529			31.71
	Vested	(465,476	)		24.22
	Canceled or forfeited	(111,264	)		26.51
	Unvested share awards outstanding, December 31, 2014	829,225			$	30.06
	The following table summarizes the closing price of the Company's stock on the date of grant and the aggregate grant date fair value of shares vesting during the years ended December 31, 2014, 2013 and 2012 (in thousands, except per share data):
		2014				2013			2012
	Range of the closing price on date of grant	$30.34 - $34.04				$24.53 - $30.72			$23.08 - $25.20
	Aggregate grant date fair value of shares vesting	$	11,273			$	10,714		$	31,346
Schedule of Share-based Compensation, Stock Options, Activity	A summary of activity related to stock option awards for the years ended December 31, 2014, 2013 and 2012 follows:
		Number of			Weighted
		Option			Average
		Awards			Exercise Price
	Option awards outstanding, December 31, 2011	5,738,122			$	25.2
	Replacement options issued in conjunction with the acquisition of Herald	256,028			31.32
	Exercised	(251,120	)		14.32
	Canceled or forfeited	(44,242	)		34.31
	Option awards outstanding, December 31, 2012	5,698,788			25.89
	Exercised	(539,588	)		18.37
	Canceled or forfeited	(88,261	)		43.3
	Option awards outstanding, December 31, 2013	5,070,939			26.38
	Exercised	(55,423	)		16.71
	Canceled or forfeited	(469	)		63.74
	Option awards outstanding, December 31, 2014	5,015,047			$	26.49
	Exercisable at December 31, 2014	5,015,047			$	26.49
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions	The grant-date fair value of option awards granted during the year ended December 31, 2012 was determined using a Black-Scholes option pricing model incorporating the following weighted average assumptions:
	Expected volatility	35.97		%
	Expected dividend yield	2.95		%
	Expected term in years	1.7
	Risk-free interest rate	0.27		%
	Weighted average grant date fair value	$	4.7
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range	Additional information about options outstanding and exercisable at December 31, 2014 is presented in the following table:
		Outstanding and Exercisable Options
	Range of Exercise Prices	Number of			Weighted		Aggregate
		Options			Average		Intrinsic
					Remaining		Value (in
					Contractual		thousands)
					Term (in
					years)
	$10.00 - $13.39	54,660			4.73		$	974,588
	$15.94 - $19.97	96,618			5.39		1,070,988
	$21.36 - $22.31	311,583			6.69		2,080,620
	$27	4,534,970			6.09		8,933,891
	$63.74	17,216			3.94		—
		5,015,047			6.09		$	13,060,087

Regulatory_Requirements_and_Re1

Regulatory Requirements and Restrictions (Tables)	12 Months Ended
	Dec. 31, 2014
Regulatory Requirements and Restrictions [Abstract]
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations	The following tables provide information regarding regulatory capital for the Company and its banking subsidiary as of December 31, 2014 and 2013 (dollars in thousands):
		2014
		Actual				Required to be								Required to be
						Considered Well								Considered
						Capitalized								Adequately
														Capitalized
		Amount		Ratio		Amount				Ratio				Amount		Ratio
	BankUnited, Inc.:
	Tier 1 leverage	$	1,937,480	10.7	%	N/A		(1	)	N/A		(1	)	$	725,784	4	%
	Tier 1 risk-based capital	$	1,937,480	15.45	%	$	752,257			6	%			$	501,505	4	%
	Total risk based capital	$	2,039,523	16.27	%	$	1,253,761			10	%			$	1,003,009	8	%
	BankUnited:
	Tier 1 leverage	$	1,636,481	9.1	%	$	898,708			5	%			$	718,967	4	%
	Tier 1 risk-based capital	$	1,636,481	13.18	%	$	744,754			6	%			$	496,502	4	%
	Total risk based capital	$	1,736,076	13.99	%	$	1,241,256			10	%			$	993,005	8	%
		2013
		Actual				Required to be								Required to be
						Considered Well								Considered
						Capitalized								Adequately
														Capitalized
		Amount		Ratio		Amount				Ratio				Amount		Ratio
	BankUnited, Inc.:
	Tier 1 leverage	$	1,801,848	12.42	%	N/A		(1	)	N/A		(1	)	$	580,454	4	%
	Tier 1 risk-based capital	$	1,801,848	21.06	%	$	513,439			6	%			$	342,293	4	%
	Total risk based capital	$	1,876,640	21.93	%	$	855,732			10	%			$	684,586	8	%
	BankUnited:
	Tier 1 leverage	$	1,519,285	10.58	%	$	718,098			5	%			$	574,479	4	%
	Tier 1 risk-based capital	$	1,519,285	18.06	%	$	504,822			6	%			$	336,548	4	%
	Total risk based capital	$	1,592,564	18.93	%	$	841,371			10	%			$	673,097	8	%
	-1	There is no tier 1 leverage ratio component in the definition of a well-capitalized bank holding company.

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2014
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 December 31, 2014 and 2013 (in thousands):
		2014
		Level 1				Level 2				Level 3				Total
	Investment securities available for sale:
	U.S. Treasury securities	$	54,967			$	—			$	—			$	54,967
	U.S. Government agency and sponsored enterprise residential mortgage-backed securities	—				1,524,716				—				1,524,716
	U.S. Government agency and sponsored enterprise commercial mortgage-backed securities	—				101,858				—				101,858
	Re-Remics	—				183,272				—				183,272
	Private label residential mortgage-backed securities and CMOs	—				235,902				168,077				403,979
	Private label commercial mortgage-backed securities	—				1,139,389				—				1,139,389
	Single family rental real estate-backed securities	—				443,017				—				443,017
	Collateralized loan obligations	—				174,332				—				174,332
	Non-mortgage asset-backed securities	—				122,164				—				122,164
	Mutual funds and preferred stocks	104,754				688				—				105,442
	State and municipal obligations	—				15,702				—				15,702
	Small Business Administration securities	—				308,728				—				308,728
	Other debt securities	—				3,210				4,918				8,128
	Derivative assets	—				29,765				49				29,814
	Total assets at fair value	$	159,721			$	4,282,743			$	173,044			$	4,615,508
	Derivative liabilities	$	—			$	69,177			$	1			$	69,178
	Total liabilities at fair value	$	—			$	69,177			$	1			$	69,178
		2013
		Level 1				Level 2				Level 3				Total
	Investment securities available for sale:
	U.S. Government agency and sponsored enterprise residential mortgage-backed securities	$	—			$	1,574,303			$	—			$	1,574,303
	U.S. Government agency and sponsored enterprise commercial mortgage-backed securities	—				26,777				—				26,777
	Re-Remics	—				271,785				—				271,785
	Private label residential mortgage-backed securities and CMOs	—				110,710				199,408				310,118
	Private label commercial mortgage-backed securities	—				808,772				—				808,772
	Non-mortgage asset-backed securities	—				178,994				—				178,994
	Mutual funds and preferred stocks	149,427				250				—				149,677
	Small Business Administration securities	—				308,937				—				308,937
	Other debt securities	—				3,160				4,601				7,761
	Derivative assets	—				21,831				35				21,866
	Total assets at fair value	$	149,427			$	3,305,519			$	204,044			$	3,658,990
	Derivative liabilities	$	—			$	43,788			$	3			$	43,791
	Total liabilities at fair value	$	—			$	43,788			$	3			$	43,791
Reconciliation of the Changes in the Fair Value of Assets and Liabilities Measured on a Recurring Basis, Unobservable Input	The following tables reconcile 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 for the years ended December 31, 2014, 2013 and 2012 (in thousands):
		2014
		Private Label				Other Debt				Derivative Assets				Derivative
		Residential				Securities								Liabilities
		Mortgage-Backed
		Securities
	Balance at beginning of period	$	199,408			$	4,601			$	35			$	(3	)
	Gains (losses) for the period included in:
	Net income	—				—				14				2
	Other comprehensive income (loss)	(4,890		)		235				—				—
	Premium and discount (amortization) accretion	8,010				173				—				—
	Purchases or issuances	—				—				—				—
	Sales	(7,787		)		—				—				—
	Settlements	(26,664		)		(91		)		—				—
	Transfers into level 3	—				—				—				—
	Transfers out of level 3	—				—				—				—
	Balance at end of period	$	168,077			$	4,918			$	49			$	(1	)
		2013
		Private Label				Other Debt				Derivative Assets				Derivative
		Residential				Securities								Liabilities
		Mortgage-Backed
		Securities
	Balance at beginning of period	$	243,058			$	4,173			$	—			$	(29	)
	Gains (losses) for the period included in:
	Net income	—				—				35				26
	Other comprehensive income (loss)	(2,157		)		691				—				—
	Premium and discount (amortization) accretion	12,470				61				—				—
	Purchases or issuances	—				—				—				—
	Sales	—				—				—				—
	Settlements	(53,963		)		(324		)		—				—
	Transfers into level 3	—				—				—				—
	Transfers out of level 3	—				—				—				—
	Balance at end of period	$	199,408			$	4,601			$	35			$	(3	)
		2012
		Private Label				Non-Mortgage Asset-Backed Securities				Other Debt				Derivative
		Residential								Securities				Liabilities
		Mortgage-Backed
		Securities
	Balance at beginning of period	$	387,687			$	79,870			$	3,159			$	—
	Gains (losses) for the period included in:
	Net income	—				—				—				(29		)
	Other comprehensive income (loss)	16,629				1,482				1,234				—
	Premium and discount (amortization) accretion	12,713				443				63				—
	Purchases or issuances	167,300				—				—				—
	Sales	—				—				—				—
	Settlements	(136,244		)		(15,499		)		(283		)		—
	Transfers into level 3	—				—				—				—
	Transfers out of level 3	(205,027		)		(66,296		)		—				—
	Balance at end of period	$	243,058			$	—			$	4,173			$	(29	)
Valuation Techniques and Unobservable Inputs Used in the Valuation of Financial Instruments Falling Within Level 3 of the Fair Value Hierarchy	The following table provides information about the valuation techniques and unobservable inputs used in the valuation of private label residential mortgage-backed securities and CMOs falling within level 3 of the fair value hierarchy as of December 31, 2014 (dollars in thousands):
			Fair Value at				Valuation Technique		Unobservable		Range (Weighted
			31-Dec-14						Input		Average)
	Investment grade		$	89,468			Discounted cash flow		Voluntary prepayment rate		0.06% - 10.96% (6.86%)
									Probability of default		0.02% - 10.62% (4.00%)
									Loss severity		0.00% - 42.40% (2.93%)
	Non-investment grade		$	44,812			Discounted cash flow		Voluntary prepayment rate		0.33% - 11.57% (5.77%)
									Probability of default		0.02% - 22.99% (5.26%)
									Loss severity		0.00% - 31.08% (2.50%)
	Option-arm (non-investment grade)		$	33,797			Discounted cash flow		Voluntary prepayment rate		3.69% - 3.72% (3.71%)
									Probability of default		2.76% - 2.97% (2.81%)
									Loss severity		16.84% - 32.37% (20.75%)
Schedule of Assets for Which Nonrecurring Changes in Fair Value have been Recorded	The following tables present assets for which non-recurring changes in fair value have been recorded for the years ended December 31, 2014, 2013 and 2012 (in thousands):
		2014
		Level 1				Level 2				Level 3				Total				Gains (losses) from Fair Value
																		Changes
	OREO	$	—			$	—			$	10,606			$	10,606			$	(2,791	)
	Impaired loans	$	—			$	—			$	11,727			$	11,727			$	2,539
		2013
		Level 1				Level 2				Level 3				Total				Gains (losses) from Fair Value
																		Changes
	OREO	$	—			$	—			$	40,570			$	40,570			$	(1,939	)
	Impaired loans	$	—			$	—			$	7,320			$	7,320			$	(22,865	)
		2012
		Level 1				Level 2				Level 3				Total				Gains (losses) from Fair Value
																		Changes
	OREO	$	—			$	—			$	76,022			$	76,022			$	(9,926	)
	Impaired loans	$	—			$	—			$	5,956			$	5,956			$	(1,600	)
Schedule of the Carrying Value and Fair Value of Financial Instruments	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 as of December 31, 2014 and 2013 (dollars in thousands):
				2014								2013
		Level		Carrying Value				Fair Value				Carrying Value				Fair Value
	Assets:
	Cash and cash equivalents	1		$	187,517			$	187,517			$	252,749			$	252,749
	Investment securities available for sale	1/2/03		4,585,694				4,585,694				3,637,124				3,637,124
	Investment securities held to maturity	3		10,000				10,000				—				—
	Non-marketable equity securities	2		191,674				191,674				152,066				152,066
	Loans held for sale	2		1,399				1,445				194				197
	Loans:
	Covered	3		1,039,672				1,763,132				1,471,493				2,199,683
	Non-covered	3		11,279,555				11,443,408				7,512,391				7,424,698
	FDIC Indemnification asset	3		974,704				595,847				1,205,117				854,703
	Accrued interest receivable	2		32,636				32,636				25,150				25,150
	Derivative assets	3-Feb		29,814				29,814				21,866				21,866
	Liabilities:
	Demand, savings and money market deposits	2		$	9,509,830			$	9,509,830			$	7,250,401			$	7,250,401
	Time deposits	2		4,001,925				4,017,476				3,282,027				3,303,358
	FHLB advances and other borrowings	2		3,318,559				3,320,338				2,414,313				2,417,566
	Accrued interest payable	2		1,997				1,997				1,643				1,643
	Derivative liabilities	3-Feb		69,178				69,178				43,791				43,791

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Schedule of the Total Lending Related Commitments Outstanding	Total lending related commitments outstanding at December 31, 2014 were as follows (in thousands):
		Covered		Non-Covered		Total
	Commitments to fund loans	$	—	$	493,222	$	493,222
	Commitments to purchase loans	—		117,193		117,193
	Unfunded commitments under lines of credit	25,765		1,252,863		1,278,628
	Commercial and standby letters of credit	—		57,670		57,670
		$	25,765	$	1,920,948	$	1,946,713

Condensed_Financial_Statements1

Condensed Financial Statements of BankUnited, Inc. (Tables)	12 Months Ended
	Dec. 31, 2014
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Balance Sheet	Condensed financial statements of BankUnited, Inc. are presented below (in thousands):
	Condensed Balance Sheets
		31-Dec-14			31-Dec-13
	Assets:
	Cash and cash equivalents	$	178,444		$	132,293
	Investment securities available for sale, at fair value	126,888			132,262
	Investment in subsidiaries	1,747,992			1,643,939
	Deferred tax asset, net	14,534			15,043
	Other assets	8,593			31,254
	Total assets	$	2,076,451		$	1,954,791
	Liabilities and Stockholders' Equity:
	Liabilities	$	23,917		$	26,093
	Stockholders' equity	2,052,534			1,928,698
	Total liabilities and stockholders' equity	$	2,076,451		$	1,954,791
Condensed Income Statement	Condensed Statements of Income
		Years Ended December 31,
		2014			2013			2012
	Income:
	Interest and dividends on investment securities available for sale	$	5,560		$	5,647		$	3,890
	Service fees from subsidiaries	15,746			6,293			14,043
	Equity in earnings of subsidiaries	208,934			216,240			218,154
	Other	—			68			5,905
	Total	230,240			228,248			241,992
	Expense:
	Employee compensation and benefits	21,388			18,465			26,928
	Other	4,571			6,806			6,914
	Total	25,959			25,271			33,842
	Income before income taxes	204,281			202,977			208,150
	Provision (benefit) for income taxes	66			(5,959		)	(3,110		)
	Net income	$	204,215		$	208,936		$	211,260
Condensed Cash Flow Statement	Condensed Statements of Cash Flows
		Years Ended December 31,
		2014			2013			2012
	Cash flows from operating activities:
	Net income	$	204,215		$	208,936		$	211,260
	Adjustments to reconcile net income to net cash provided by operating activities:
	Equity in undistributed earnings of subsidiaries	(116,934		)	(116,240		)	(118,154		)
	Equity based compensation	15,551			13,936			23,204
	Other	20,804			5,267			(5,529		)
	Net cash provided by operating activities	123,636			111,899			110,781
	Cash flows from investing activities:
	Capital contributions to subsidiary	—			—			(30,000		)
	Purchase of investment securities available for sale	—			—			(99,710		)
	Proceeds from repayments, sale, maturities and calls of investment securities available for sale	7,319			19,851			53,094
	Cash paid in business combination	—			—			(25,164		)
	Other	(137		)	79			(326		)
	Net cash provided by (used in) investing activities	7,182			19,930			(102,106		)
	Cash flows from financing activities:
	Dividends paid	(87,716		)	(65,225		)	(89,021		)
	Other	3,049			12,700			5,209
	Net cash used in financing activities	(84,667		)	(52,525		)	(83,812		)
	Net increase (decrease) in cash and cash equivalents	46,151			79,304			(75,137		)
	Cash and cash equivalents, beginning of period	132,293			52,989			128,126
	Cash and cash equivalents, end of period	$	178,444		$	132,293		$	52,989
	Supplemental schedule of non-cash investing and financing activities:
	Dividends declared, not paid	$	21,968		$	21,833		$	—
	Equity consideration issued in business combination	$	—		$	—		$	39,861

Quarterly_Financial_Informatio1

Quarterly Financial Information (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Financial Information	Financial information by quarter for the years ended December 31, 2014 and 2013 follows (in thousands, except per share data:
		2014
		Fourth		Third		Second		First		Total
		Quarter		Quarter		Quarter		Quarter
	Interest income	$	200,227	$	201,222	$	191,733	$	190,562	$	783,744
	Interest expense	28,725		27,973		25,855		24,098		106,651
	Net interest income before provision for loan losses	171,502		173,249		165,878		166,464		677,093
	Provision for loan losses	20,523		5,387		7,192		8,403		41,505
	Net interest income after provision for loan losses	150,979		167,862		158,686		158,061		635,588
	Non-interest income	19,046		14,451		20,478		30,190		84,165
	Non-interest expense	108,489		108,933		106,620		102,461		426,503
	Income before income taxes	61,536		73,380		72,544		85,790		293,250
	Provision for income taxes	14,702		19,813		24,001		30,519		89,035
	Net income	$	46,834	$	53,567	$	48,543	$	55,271	$	204,215
	Earnings per common share, basic	$	0.45	$	0.51	$	0.46	$	0.53	$	1.95
	Earnings per common share, diluted	$	0.45	$	0.51	$	0.46	$	0.53	$	1.95
		2013
		Fourth		Third		Second		First		Total
		Quarter		Quarter		Quarter		Quarter
	Interest income	$	188,664	$	187,684	$	186,098	$	176,375	$	738,821
	Interest expense	24,409		23,566		22,048		22,588		92,611
	Net interest income before provision for loan losses	164,255		164,118		164,050		153,787		646,210
	Provision for loan losses	12,512		2,604		4,881		11,967		31,964
	Net interest income after provision for loan losses	151,743		161,514		159,169		141,820		614,246
	Non-interest income	21,009		13,687		13,230		20,123		68,049
	Non-interest expense	99,363		96,644		85,497		82,789		364,293
	Income before income taxes	73,389		78,557		86,902		79,154		318,002
	Provision for income taxes	20,996		24,248		32,894		30,928		109,066
	Net income	$	52,393	$	54,309	$	54,008	$	48,226	$	208,936
	Earnings per common share, basic	$	0.5	$	0.52	$	0.52	$	0.48	$	2.03
	Earnings per common share, diluted	$	0.5	$	0.52	$	0.52	$	0.47	$	2.01

Basis_of_Presentation_and_Summ2

Basis of Presentation and Summary of Significant Accounting Policies (Narrative) (Details) (USD $)	0 Months Ended	3 Months Ended		12 Months Ended
	21-May-09	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	21-May-09
	Agreement	bank		quarter
				subsidiary
				banking_center
				branch
				county
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Subsidiary				1
Number of branches located in Florida (in Branches)				100
Number of Florida counties with branches (in counties)				15
Number of branches located in New York metropolitan area (in Branches)				6
Number of loss sharing agreements	2
Percent FDIC will reimburse for covered losses (in Percent)	80.00%					80.00%
Limit on losses reimbursed at 80%	$4,000,000,000					$4,000,000,000
Percent of losses in excess of limit FDIC will reimburse (in Percent)	95.00%					95.00%
Period of delinquency of principal or interest at which new and non-ACI 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 new and non-ACI residential and consumer 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 principal or interest paid at which new and non-ACI residential loans are returned to accrual status (in Duration)				90 days
Maximum period of loans past due reported as current (in Duration) (less than)				30 days
The value at which non accrual status commercial relationships are evaluated for impairment				750,000
Period of no missed payments, borrower exempt from troubled-debt restructuring (in Duration)				6 months
Period pursuant to modified loan terms of borrower compliance loan is returned to accrual status (in Duration)				6 months
Minimum period of delinquency for new open- and closed-end loans secured by residential real estate, at which an assessment of collateral value is made (in Duration)				120 days
Minimum period of delinquency of any outstanding loan balance in excess of fair value less cost to sell, at which it 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
Minimum period of delinquency at which a four quarter roll matrix is used to estimate the amount within each delinquency bucket (in Duration)				120 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
Percent of loss severity assumption for home equity loans and lines of credit projected to roll to 120 days delinquency (in Percent)				100.00%
Period of delinquency at which 100% loss severity is assumed (in Duration)				120 days
ALLL, loss emergence period				1 year
ALLL, municipal, loss emergence period				3 years
Property, Plant and Equipment [Line Items]
ALL, net charge-off rate calculation, banks used in assumption (in Banks)		34
ALLL, average net charge-off rate calculation, loss emergence period		3 years	2 years
Goodwill				67,000,000	67,000,000
Quarter during which the Company performs its annual goodwill impairment test (in Quarter)				3
Goodwill, impairment loss				$0	$0
Percentage floor, after which the likelihood that the tax benefit related to uncertain tax positions are measured (in Percent)				50.00%
Branch buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life				30 years
Minimum | Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life				5 years
Minimum | Furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life				5 years
Minimum | Computer equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life				3 years
Minimum | Software and software licensing rights
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life				3 years
Maximum | Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life				20 years
Maximum | Furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life				7 years
Maximum | Computer equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life				5 years
Maximum | Software and software licensing rights
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life				5 years
New York
Property, Plant and Equipment [Line Items]
ALL, net charge-off rate calculation, banks used in assumption (in Banks)		2

Earnings_Per_Common_Share_Comp

Earnings Per Common Share (Computation of Basic and Diluted Earnings per Common Share) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Numerator:
Net income	$46,834	$53,567	$48,543	$55,271	$52,393	$54,309	$54,008	$48,226	$204,215	$208,936	$211,260
Preferred stock dividends									0	0	-3,899
Net income available to common stockholders									204,215	208,936	207,361
Distributed and undistributed earnings allocated to participating securities									-7,991	-9,380	-15,081
Income allocated to common stockholders for basic earnings per common share									196,224	199,556	192,280
Denominator:
Weighted average common shares outstanding									101,574,076	99,587,970	94,791,484
Less average unvested stock awards									-1,117,869	-1,093,930	-1,137,210
Weighted average shares for basic earnings per common share									100,456,207	98,494,040	93,654,274
Basic earnings per common share (in Dollars per Share)	$0.45	$0.51	$0.46	$0.53	$0.50	$0.52	$0.52	$0.48	$1.95	$2.03	$2.05
Numerator:
Income allocated to common stockholders for basic earnings per common share									196,224	199,556	192,280
Adjustment for earnings reallocated from participating securities									16	1,265	20
Income used in calculating diluted earnings per common share									$196,240	$200,821	$192,300
Denominator:
Weighted average shares for basic earnings per common share									100,456,207	98,494,040	93,654,274
Dilutive effect of stock options and preferred shares									139,606	1,257,565	174,509
Weighted average shares for diluted earnings per common share									100,595,813	99,751,605	93,828,783
Diluted earnings per common share (in Dollars per Share)	$0.45	$0.51	$0.46	$0.53	$0.50	$0.52	$0.52	$0.47	$1.95	$2.01	$2.05

Earnings_Per_Common_Share_Pote

Earnings Per Common Share (Potentially Dilutive Securities Outstanding) (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Unvested shares
Antidilutive Securities Excluded from Computation of Earnings per Share [Line Items]
Potentially dilutive securities outstanding (in Shares)	881,693	752,609	1,248,707
Stock options and warrants
Antidilutive Securities Excluded from Computation of Earnings per Share [Line Items]
Potentially dilutive securities outstanding (in Shares)	6,386,424	6,386,815	6,950,735
Convertible preferred shares
Antidilutive Securities Excluded from Computation of Earnings per Share [Line Items]
Potentially dilutive securities outstanding (in Shares)	0	0	5,415,794

Acquisition_Activity_Narrative

Acquisition Activity (Narrative) (Details) (USD $)	0 Months Ended	12 Months Ended
	Feb. 29, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 29, 2012
Business Combinations [Abstract]
Business acquisition, effective date of acquisition	29-Feb-12
Business combination, consideration transferred	$65,000,000
Payments to acquire businesses, gross	25,000,000
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Business acquisition, equity interest issued or issuable, value assigned	39,000,000				39,000,000
Business acquisition, value of stock options and warrants issued	1,000,000				1,000,000
Business acquisition, assets acquired	508,000,000				508,000,000
Business acquisition, liabilities assumed	438,000,000				438,000,000
Business combination, bargain purchase, gain recognized, amount	$5,300,000	$0	$0	$5,288,000
Business acquisition, percentage of voting interests acquired	100.00%				100.00%
Common Stock
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Stock issued during period, shares, acquisitions	1,676,060

Investment_Securities_Schedule

Investment Securities (Schedule of Investment Securities Available for Sale) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$4,474,490
Gross Unrealized Gains	127,295
Gross Unrealized Losses	-16,091
Investment securities available for sale, at fair value (including covered securities of $205,769 at December 31, 2013)	4,585,694	3,637,124
Covered Securities, Amortized Cost		138,395
Covered Securities, Gross Unrealized Gains		67,484
Covered Securities, Gross Unrealized Losses		-110
Covered Securities, Fair Value	0	205,769
Non-Covered Securities, Amortized Cost		3,386,800
Non-Covered Securities, Gross Unrealized Gains		70,155
Non-Covered Securities, Gross Unrealized Losses		-25,600
Non-Covered Securities, Fair Value		3,431,355
U.S. Treasury securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	54,924
Gross Unrealized Gains	43
Gross Unrealized Losses	0
Investment securities available for sale, at fair value (including covered securities of $205,769 at December 31, 2013)	54,967
U.S. Government agency and sponsored enterprise residential mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,501,504
Gross Unrealized Gains	29,613
Gross Unrealized Losses	-6,401
Investment securities available for sale, at fair value (including covered securities of $205,769 at December 31, 2013)	1,524,716
Covered Securities, Amortized Cost		0
Covered Securities, Gross Unrealized Gains		0
Covered Securities, Gross Unrealized Losses		0
Covered Securities, Fair Value		0
Non-Covered Securities, Amortized Cost		1,548,671
Non-Covered Securities, Gross Unrealized Gains		34,191
Non-Covered Securities, Gross Unrealized Losses		-8,559
Non-Covered Securities, Fair Value		1,574,303
U.S. Government agency and sponsored enterprise commercial mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	101,089
Gross Unrealized Gains	769
Gross Unrealized Losses	0
Investment securities available for sale, at fair value (including covered securities of $205,769 at December 31, 2013)	101,858
Covered Securities, Amortized Cost		0
Covered Securities, Gross Unrealized Gains		0
Covered Securities, Gross Unrealized Losses		0
Covered Securities, Fair Value		0
Non-Covered Securities, Amortized Cost		27,132
Non-Covered Securities, Gross Unrealized Gains		0
Non-Covered Securities, Gross Unrealized Losses		-355
Non-Covered Securities, Fair Value		26,777
Re-Remics
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	179,664
Gross Unrealized Gains	3,613
Gross Unrealized Losses	-5
Investment securities available for sale, at fair value (including covered securities of $205,769 at December 31, 2013)	183,272
Covered Securities, Amortized Cost		0
Covered Securities, Gross Unrealized Gains		0
Covered Securities, Gross Unrealized Losses		0
Covered Securities, Fair Value		0
Non-Covered Securities, Amortized Cost		267,525
Non-Covered Securities, Gross Unrealized Gains		4,261
Non-Covered Securities, Gross Unrealized Losses		-1
Non-Covered Securities, Fair Value		271,785
Private label residential mortgage-backed securities and CMOs
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	350,300
Gross Unrealized Gains	54,222
Gross Unrealized Losses	-543
Investment securities available for sale, at fair value (including covered securities of $205,769 at December 31, 2013)	403,979
Covered Securities, Amortized Cost		119,434
Covered Securities, Gross Unrealized Gains		56,539
Covered Securities, Gross Unrealized Losses		-110
Covered Securities, Fair Value		175,863
Non-Covered Securities, Amortized Cost		135,750
Non-Covered Securities, Gross Unrealized Gains		329
Non-Covered Securities, Gross Unrealized Losses		-1,824
Non-Covered Securities, Fair Value		134,255
Private label commercial mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,134,854
Gross Unrealized Gains	9,470
Gross Unrealized Losses	-4,935
Investment securities available for sale, at fair value (including covered securities of $205,769 at December 31, 2013)	1,139,389
Covered Securities, Amortized Cost		0
Covered Securities, Gross Unrealized Gains		0
Covered Securities, Gross Unrealized Losses		0
Covered Securities, Fair Value		0
Non-Covered Securities, Amortized Cost		814,114
Non-Covered Securities, Gross Unrealized Gains		7,638
Non-Covered Securities, Gross Unrealized Losses		-12,980
Non-Covered Securities, Fair Value		808,772
Single family rental real estate-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	446,079
Gross Unrealized Gains	468
Gross Unrealized Losses	-3,530
Investment securities available for sale, at fair value (including covered securities of $205,769 at December 31, 2013)	443,017
Collateralized loan obligations
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	174,767
Gross Unrealized Gains	0
Gross Unrealized Losses	-435
Investment securities available for sale, at fair value (including covered securities of $205,769 at December 31, 2013)	174,332
Non-mortgage asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	117,562
Gross Unrealized Gains	4,608
Gross Unrealized Losses	-6
Investment securities available for sale, at fair value (including covered securities of $205,769 at December 31, 2013)	122,164
Covered Securities, Amortized Cost		0
Covered Securities, Gross Unrealized Gains		0
Covered Securities, Gross Unrealized Losses		0
Covered Securities, Fair Value		0
Non-Covered Securities, Amortized Cost		172,329
Non-Covered Securities, Gross Unrealized Gains		6,676
Non-Covered Securities, Gross Unrealized Losses		-11
Non-Covered Securities, Fair Value		178,994
Mutual funds and preferred stocks
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	96,294
Gross Unrealized Gains	9,148
Gross Unrealized Losses	0
Investment securities available for sale, at fair value (including covered securities of $205,769 at December 31, 2013)	105,442
Covered Securities, Amortized Cost		15,419
Covered Securities, Gross Unrealized Gains		6,726
Covered Securities, Gross Unrealized Losses		0
Covered Securities, Fair Value		22,145
Non-Covered Securities, Amortized Cost		125,387
Non-Covered Securities, Gross Unrealized Gains		4,015
Non-Covered Securities, Gross Unrealized Losses		-1,870
Non-Covered Securities, Fair Value		127,532
State and municipal obligations
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	15,317
Gross Unrealized Gains	385
Gross Unrealized Losses	0
Investment securities available for sale, at fair value (including covered securities of $205,769 at December 31, 2013)	15,702
Small Business Administration securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	298,424
Gross Unrealized Gains	10,540
Gross Unrealized Losses	-236
Investment securities available for sale, at fair value (including covered securities of $205,769 at December 31, 2013)	308,728
Covered Securities, Amortized Cost		0
Covered Securities, Gross Unrealized Gains		0
Covered Securities, Gross Unrealized Losses		0
Covered Securities, Fair Value		0
Non-Covered Securities, Amortized Cost		295,892
Non-Covered Securities, Gross Unrealized Gains		13,045
Non-Covered Securities, Gross Unrealized Losses		0
Non-Covered Securities, Fair Value		308,937
Other debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,712
Gross Unrealized Gains	4,416
Gross Unrealized Losses	0
Investment securities available for sale, at fair value (including covered securities of $205,769 at December 31, 2013)	8,128
Covered Securities, Amortized Cost		3,542
Covered Securities, Gross Unrealized Gains		4,219
Covered Securities, Gross Unrealized Losses		0
Covered Securities, Fair Value		7,761
Non-Covered Securities, Amortized Cost		0
Non-Covered Securities, Gross Unrealized Gains		0
Non-Covered Securities, Gross Unrealized Losses		0
Non-Covered Securities, Fair Value		$0

Investment_Securities_Narrativ

Investment Securities (Narrative) (Details) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014
	security	security	security
Schedule of Available-for-sale Securities [Line Items]
Investment securities available for sale	$4,585,694,000	$3,637,124,000		$4,585,694,000
Available-for-sale securities, amortized cost	4,474,490,000			4,474,490,000
Number of held-to-maturity securities	1			1
Investment securities held to maturity	10,000,000	0		10,000,000
Weighted average life of investment portfolio (in Duration)	4 years 1 month 21 days
Effective duration of investment portfolio (in Duration)	1 year 8 months 27 days
Available for sale securities pledged	1,000,000,000	900,000,000		1,000,000,000
Increase in FDIC indemnification asset mitigating impact of impairment	209,000	-963,000
Number of securities determined to be other than temporarily impaired during the period (in Securities)	0	1	0
Total number of securities in unrealized loss positions (in Securities)	42			42
Number of securities which impairment considered insignificant (in Securities)	7			7
Available-for-sale securities, gross unrealized loss, considered insignificant	53,000
Net Loss on FDIC Indemnification
Schedule of Available-for-sale Securities [Line Items]
Increase in FDIC indemnification asset mitigating impact of impairment	-167,000	770,000
Securities requiring reimbursement to the FDIC for recoveries
Schedule of Available-for-sale Securities [Line Items]
Investment securities available for sale	168,000,000			168,000,000
Available-for-sale securities, amortized cost	108,000,000			108,000,000
Available-for-sale securities, gross unrealized gain	60,000,000
U.S. Government agency and sponsored enterprise residential and commercial mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Number of securities in unrealized loss positions (in Securities)	8			8
Unrealized loss as a percent of amortized cost on securities in continuous unrealized loss positions (or less, less than)	5.00%			5.00%
Private label residential mortgage-backed securities and CMOs
Schedule of Available-for-sale Securities [Line Items]
Investment securities available for sale	403,979,000			403,979,000
Available-for-sale securities, amortized cost	350,300,000			350,300,000
Number of securities in unrealized loss positions (in Securities)	4			4
Private label commercial mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Investment securities available for sale	1,139,389,000			1,139,389,000
Available-for-sale securities, amortized cost	1,134,854,000			1,134,854,000
Number of securities in unrealized loss positions (in Securities)	13			13
Unrealized loss as a percent of amortized cost on securities in continuous unrealized loss positions (or less, less than)	2.00%			2.00%
Single family rental real estate-backed securities
Schedule of Available-for-sale Securities [Line Items]
Investment securities available for sale	443,017,000			443,017,000
Available-for-sale securities, amortized cost	446,079,000			446,079,000
Number of securities in unrealized loss positions (in Securities)	7			7
Available-For-Sale, Securities In Unrealized Loss Positions, Period Of Impairment				6 months
Unrealized loss as a percent of amortized cost on securities in continuous unrealized loss positions (or less, less than)	2.00%			2.00%
Collateralized loan obligations
Schedule of Available-for-sale Securities [Line Items]
Investment securities available for sale	174,332,000			174,332,000
Available-for-sale securities, amortized cost	174,767,000			174,767,000
Number of securities in unrealized loss positions (in Securities)	1			1
Available-For-Sale, Securities In Unrealized Loss Positions, Period Of Impairment				4 months
Unrealized loss as a percent of amortized cost on securities in continuous unrealized loss positions (or less, less than)	1.00%			1.00%
Small Business Administration securities
Schedule of Available-for-sale Securities [Line Items]
Investment securities available for sale	308,728,000			308,728,000
Available-for-sale securities, amortized cost	$298,424,000			$298,424,000
Number of securities in unrealized loss positions (in Securities)	2			2
Available-For-Sale, Securities In Unrealized Loss Positions, Period Of Impairment				3 months
Unrealized loss as a percent of amortized cost on securities in continuous unrealized loss positions (or less, less than)	1.00%			1.00%

Investment_Securities_Schedule1

Investment Securities (Schedule of Maturities of Investment Securities Available for Sale) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Investments, Debt and Equity Securities [Abstract]
Due in one year or less, Amortized Cost	$510,919
Due after one year through five years, Amortized Cost	2,576,280
Due after five years through ten years, Amortized Cost	1,028,754
Due after ten years, Amortized Cost	262,243
Mutual funds and preferred stocks with no stated maturity, Amortized Cost	96,294
Amortized Cost	4,474,490
Due in one year or less, Fair Value	529,197
Due after one year through five years, Fair Value	2,620,431
Due after five years through ten years, Fair Value	1,050,596
Due after ten years, Fair Value	280,028
Mutual funds and preferred stocks with no stated maturity, Fair Value	105,442
Fair Value	$4,585,694	$3,637,124

Investment_Securities_Schedule2

Investment Securities (Schedule of Gains and Losses on the Sale and Exchange of Investment Securities Available for Sale) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Investments, Debt and Equity Securities [Abstract]
Proceeds from sale of investment securities available for sale	$355,798	$874,876	$835,745
Gross realized gains	4,987	11,119	17,338
Gross realized losses	-1,128	-1,527	-299
Net realized gain	3,859	9,592	17,039
OTTI	0	-963	0
Gain on investment securities available for sale, net	$3,859	$8,629	$17,039

Investment_Securities_Schedule3

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 $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	$506,258	$1,112,030
Unrealized Losses, Less than 12 Months	-5,580	-25,472
Fair Value,12 Months or Greater	554,501	10,303
Unrealized Losses, 12 Months or Greater	-10,511	-238
Fair Value, Total	1,060,759	1,122,333
Unrealized Losses, Total	-16,091	-25,710
U.S. Government agency and sponsored enterprise residential mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	7,058	414,361
Unrealized Losses, Less than 12 Months	-34	-8,559
Fair Value,12 Months or Greater	300,057	0
Unrealized Losses, 12 Months or Greater	-6,367	0
Fair Value, Total	307,115	414,361
Unrealized Losses, Total	-6,401	-8,559
U.S. Government agency and sponsored enterprise commercial mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months		26,777
Unrealized Losses, Less than 12 Months		-355
Fair Value,12 Months or Greater		0
Unrealized Losses, 12 Months or Greater		0
Fair Value, Total		26,777
Unrealized Losses, Total		-355
Re-Remics
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	0	11,037
Unrealized Losses, Less than 12 Months	0	-1
Fair Value,12 Months or Greater	335	0
Unrealized Losses, 12 Months or Greater	-5	0
Fair Value, Total	335	11,037
Unrealized Losses, Total	-5	-1
Private label residential mortgage-backed securities and CMOs
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	60,076	79,048
Unrealized Losses, Less than 12 Months	-189	-1,696
Fair Value,12 Months or Greater	14,653	10,303
Unrealized Losses, 12 Months or Greater	-354	-238
Fair Value, Total	74,729	89,351
Unrealized Losses, Total	-543	-1,934
Private label commercial mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	103,900	511,778
Unrealized Losses, Less than 12 Months	-1,150	-12,980
Fair Value,12 Months or Greater	239,456	0
Unrealized Losses, 12 Months or Greater	-3,785	0
Fair Value, Total	343,356	511,778
Unrealized Losses, Total	-4,935	-12,980
Single family rental real estate-backed securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	233,012
Unrealized Losses, Less than 12 Months	-3,530
Fair Value,12 Months or Greater	0
Unrealized Losses, 12 Months or Greater	0
Fair Value, Total	233,012
Unrealized Losses, Total	-3,530
Collateralized loan obligations
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	49,565
Unrealized Losses, Less than 12 Months	-435
Fair Value,12 Months or Greater	0
Unrealized Losses, 12 Months or Greater	0
Fair Value, Total	49,565
Unrealized Losses, Total	-435
Non-mortgage asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	2,796	1,516
Unrealized Losses, Less than 12 Months	-6	-11
Fair Value,12 Months or Greater	0	0
Unrealized Losses, 12 Months or Greater	0	0
Fair Value, Total	2,796	1,516
Unrealized Losses, Total	-6	-11
Small Business Administration securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months	49,851
Unrealized Losses, Less than 12 Months	-236
Fair Value,12 Months or Greater	0
Unrealized Losses, 12 Months or Greater	0
Fair Value, Total	49,851
Unrealized Losses, Total	-236
Mutual funds and preferred stocks
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 Months		67,513
Unrealized Losses, Less than 12 Months		-1,870
Fair Value,12 Months or Greater		0
Unrealized Losses, 12 Months or Greater		0
Fair Value, Total		67,513
Unrealized Losses, Total		($1,870)

Loans_and_Allowance_for_Loan_a2

Loans and Allowance for Loan and Lease Losses (Schedule of Accounts Notes Loans and Financing Receivable) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounts Notes And Loans Receivable [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs	$1,043,864	$1,483,888
Loans, gross	12,378,267	9,026,109
Premiums, discounts and deferred fees and costs, net	36,502	27,500
Loans net of premiums, discounts and deferred fees and costs	12,414,769	9,053,609
Allowance for loan and lease losses	-95,542	-69,725
Loans, net	12,319,227	8,983,884
Percent of Total	100.00%	100.00%
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Gain (loss) on sale of covered loans	20,369	-16,195	-29,270
Net Investment in Direct Financing Leases [Abstract]
Total minimum lease payments to be received	489,892	360,584
Unearned income	-37,277	-23,202
Initial direct costs	5,567	2,980
Net investment in direct financing leases, total	458,182	340,362
Capital Leases, Future Minimum Payments Receivable, Fiscal Year Maturity [Abstract]
2015	146,475
2016	123,036
2017	75,867
2018	42,365
2019	24,070
Thereafter	78,079
Total minimum lease payments to be received	489,892	360,584
1-4 single family residential
Accounts Notes And Loans Receivable [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs	921,687	1,116,682
Loans, gross	3,416,932	2,927,722
Loans net of premiums, discounts and deferred fees and costs	3,444,525	2,944,462
Percent of Total	27.60%	32.40%
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
UPB of loans sold	269,143	230,031	239,135
Cash proceeds, net of transaction costs	177,560	116,611	103,796
Recorded investment in loans sold	144,231	82,160	103,127
Net pre-tax impact on earnings, excluding gain on FDIC indemnification	33,329	34,451	669
Gain (loss) on sale of covered loans	2,398	-16,195	-29,270
Proceeds recorded in interest income	30,931	50,646	29,939
Excess of proceeds recorded in interest income over recorded loss on sale of covered loans	33,329	34,451	669
Gain (loss) on FDIC indemnification	-809	21,021	30,725
Percent of loans net of premiums, discounts and deferred fees and costs, covered and non-covered (in Percent)	100.00%	100.00%
1-4 single family residential | California
Accounts Notes And Loans Receivable [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs	66,105	80,919
Loans net of premiums, discounts and deferred fees and costs	1,111,535	946,261
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Percent of loans net of premiums, discounts and deferred fees and costs, covered and non-covered (in Percent)	32.30%	32.10%
1-4 single family residential | Florida
Accounts Notes And Loans Receivable [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs	483,297	604,384
Loans net of premiums, discounts and deferred fees and costs	818,370	846,211
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Percent of loans net of premiums, discounts and deferred fees and costs, covered and non-covered (in Percent)	23.80%	28.70%
1-4 single family residential | New York
Accounts Notes And Loans Receivable [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs	27,568	31,406
Loans net of premiums, discounts and deferred fees and costs	346,052	150,553
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Percent of loans net of premiums, discounts and deferred fees and costs, covered and non-covered (in Percent)	10.00%	5.10%
1-4 single family residential | Others
Accounts Notes And Loans Receivable [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs	344,717	399,973
Loans net of premiums, discounts and deferred fees and costs	1,168,568	1,001,437
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Percent of loans net of premiums, discounts and deferred fees and costs, covered and non-covered (in Percent)	33.90%	34.10%
Home equity loans and lines of credit
Accounts Notes And Loans Receivable [Line Items]
Loans, gross	125,626	168,944
Percent of Total	1.00%	1.90%
Residential
Accounts Notes And Loans Receivable [Line Items]
Loans, gross	3,542,558	3,096,666
Loans net of premiums, discounts and deferred fees and costs	3,568,529	3,111,167
Percent of Total	28.60%	34.30%
Multi-family
Accounts Notes And Loans Receivable [Line Items]
Loans, gross	1,952,189	1,139,319
Percent of Total	15.80%	12.60%
Commercial real estate, Owner occupied
Accounts Notes And Loans Receivable [Line Items]
Loans, gross	1,043,370	768,712
Percent of Total	8.40%	8.50%
Commercial real estate, Non-owner occupied
Accounts Notes And Loans Receivable [Line Items]
Loans, gross	1,784,079	1,041,133
Percent of Total	14.40%	11.50%
Construction and land
Accounts Notes And Loans Receivable [Line Items]
Loans, gross	169,720	149,420
Percent of Total	1.40%	1.70%
Commercial and industrial
Accounts Notes And Loans Receivable [Line Items]
Loans, gross	2,403,293	1,664,023
Percent of Total	19.40%	18.50%
Commercial finance subsidiaries
Accounts Notes And Loans Receivable [Line Items]
Loans, gross	1,456,751	952,050
Percent of Total	11.80%	10.50%
Commercial
Accounts Notes And Loans Receivable [Line Items]
Loans, gross	8,809,402	5,714,657
Loans net of premiums, discounts and deferred fees and costs	8,819,980	5,720,722
Percent of Total	71.20%	63.30%
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Cash proceeds, net of transaction costs	101,023
Carrying value of loans transferred to loans held for sale	86,521
Provision for loan losses recorded upon transfer to loans held for sale	-3,469
Recorded investment in loans sold	83,052
Gain (loss) on sale of covered loans	17,971
Gain (loss) on FDIC indemnification	-2,085
Consumer
Accounts Notes And Loans Receivable [Line Items]
Loans, gross	26,307	214,786
Loans net of premiums, discounts and deferred fees and costs	26,260	221,720
Percent of Total	0.20%	2.40%
New Loans
Accounts Notes And Loans Receivable [Line Items]
Non-covered loans, gross	11,230,392	7,514,113
Non-covered premiums, discounts and deferred fees and costs, net	47,097	40,748
Non-covered loans, net of premiums, discounts and deferred fees and costs	11,277,489	7,554,861
Non-covered Allowance for loan and lease losses	-91,350	-57,330
Non-covered loans, net	11,186,139	7,497,531
New Loans | 1-4 single family residential
Accounts Notes And Loans Receivable [Line Items]
Non-covered loans, gross	2,486,272	1,800,332
Non-covered loans, net of premiums, discounts and deferred fees and costs	2,522,838	1,827,780
Percent of Total	100.00%	100.00%
New Loans | 1-4 single family residential | California
Accounts Notes And Loans Receivable [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	1,045,430	865,342
Percent of Total	41.40%	47.30%
New Loans | 1-4 single family residential | Florida
Accounts Notes And Loans Receivable [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	335,073	241,827
Percent of Total	13.30%	13.20%
New Loans | 1-4 single family residential | New York
Accounts Notes And Loans Receivable [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	318,484	119,147
Percent of Total	12.60%	6.50%
New Loans | 1-4 single family residential | Others
Accounts Notes And Loans Receivable [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	823,851	601,464
Percent of Total	32.70%	33.00%
New Loans | Home equity loans and lines of credit
Accounts Notes And Loans Receivable [Line Items]
Non-covered loans, gross	1,827	1,535
Non-covered loans, net of premiums, discounts and deferred fees and costs	1,827	1,535
New Loans | Residential
Accounts Notes And Loans Receivable [Line Items]
Non-covered loans, gross	2,488,099	1,801,867
New Loans | Multi-family
Accounts Notes And Loans Receivable [Line Items]
Non-covered loans, gross	1,927,225	1,097,872
Non-covered loans, net of premiums, discounts and deferred fees and costs	1,930,732	1,099,153
New Loans | Commercial real estate, Owner occupied
Accounts Notes And Loans Receivable [Line Items]
Non-covered loans, gross	1,008,930	712,844
Non-covered loans, net of premiums, discounts and deferred fees and costs	1,009,791	711,534
New Loans | Commercial real estate, Non-owner occupied
Accounts Notes And Loans Receivable [Line Items]
Non-covered loans, gross	1,753,317	946,543
Non-covered loans, net of premiums, discounts and deferred fees and costs	1,752,079	947,652
New Loans | Construction and land
Accounts Notes And Loans Receivable [Line Items]
Non-covered loans, gross	167,713	138,091
Non-covered loans, net of premiums, discounts and deferred fees and costs	167,138	137,757
New Loans | Commercial and industrial
Accounts Notes And Loans Receivable [Line Items]
Non-covered loans, gross	2,402,064	1,651,739
Non-covered loans, net of premiums, discounts and deferred fees and costs	2,400,579	1,652,595
New Loans | Commercial finance subsidiaries
Accounts Notes And Loans Receivable [Line Items]
Non-covered loans, gross	1,456,751	952,050
Non-covered loans, net of premiums, discounts and deferred fees and costs	1,466,259	956,814
New Loans | Commercial
Accounts Notes And Loans Receivable [Line Items]
Non-covered loans, gross	8,716,000	5,499,139
Non-covered loans, net of premiums, discounts and deferred fees and costs	8,726,578	5,505,505
New Loans | Consumer
Accounts Notes And Loans Receivable [Line Items]
Non-covered loans, gross	26,293	213,107
Non-covered loans, net of premiums, discounts and deferred fees and costs	26,246	220,041
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Recorded investment in loans sold	302,800
ACI loans
Accounts Notes And Loans Receivable [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs		1,306,107
Loans net of premiums, discounts and deferred fees and costs	990,595	1,306,107
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Beginning Balance	1,158,572	1,286,066	1,523,615
Reclassifications from non-accretable difference	185,604	282,952	206,934
Accretion	-338,864	-410,446	-444,483
Ending Balance	1,005,312	1,158,572	1,286,066
ACI loans | 1-4 single family residential
Accounts Notes And Loans Receivable [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs	874,522	1,057,012
ACI loans | Home equity loans and lines of credit
Accounts Notes And Loans Receivable [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs	22,657	39,602
ACI loans | Residential
Accounts Notes And Loans Receivable [Line Items]
Loans net of premiums, discounts and deferred fees and costs	897,179	1,096,614
ACI loans | Multi-family
Accounts Notes And Loans Receivable [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs		41,447
Non-covered loans, net of premiums, discounts and deferred fees and costs	24,964
ACI loans | Commercial real estate, Owner occupied
Accounts Notes And Loans Receivable [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs		55,179
Non-covered loans, net of premiums, discounts and deferred fees and costs	34,440
ACI loans | Commercial real estate, Non-owner occupied
Accounts Notes And Loans Receivable [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs		94,538
Non-covered loans, net of premiums, discounts and deferred fees and costs	30,762
ACI loans | Construction and land
Accounts Notes And Loans Receivable [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs		10,600
Non-covered loans, net of premiums, discounts and deferred fees and costs	2,007
ACI loans | Commercial and industrial
Accounts Notes And Loans Receivable [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs		6,050
Non-covered loans, net of premiums, discounts and deferred fees and costs	1,229
ACI loans | Commercial finance subsidiaries
Accounts Notes And Loans Receivable [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs		0
Non-covered loans, net of premiums, discounts and deferred fees and costs	0
ACI loans | Commercial
Accounts Notes And Loans Receivable [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs		207,814
Non-covered loans, net of premiums, discounts and deferred fees and costs	93,402
Loans net of premiums, discounts and deferred fees and costs	93,402	207,814
ACI loans | Consumer
Accounts Notes And Loans Receivable [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs		1,679
Non-covered loans, net of premiums, discounts and deferred fees and costs	14
Loans net of premiums, discounts and deferred fees and costs	14	1,679
ACI Loans, Non-Covered
Accounts Notes And Loans Receivable [Line Items]
Non-covered loans, gross	93,416	14,860
Non-covered premiums, discounts and deferred fees and costs, net	0	0
Non-covered loans, net of premiums, discounts and deferred fees and costs	93,416	14,860
Non-covered Allowance for loan and lease losses	0	0
Non-covered loans, net	93,416	14,860
ACI Loans, Non-Covered | 1-4 single family residential
Accounts Notes And Loans Receivable [Line Items]
Non-covered loans, gross	0	0
ACI Loans, Non-Covered | Home equity loans and lines of credit
Accounts Notes And Loans Receivable [Line Items]
Non-covered loans, gross	0	0
ACI Loans, Non-Covered | Residential
Accounts Notes And Loans Receivable [Line Items]
Non-covered loans, gross	0	0
ACI Loans, Non-Covered | Multi-family
Accounts Notes And Loans Receivable [Line Items]
Non-covered loans, gross	24,964	8,093
ACI Loans, Non-Covered | Commercial real estate, Owner occupied
Accounts Notes And Loans Receivable [Line Items]
Non-covered loans, gross	34,440	5,318
ACI Loans, Non-Covered | Commercial real estate, Non-owner occupied
Accounts Notes And Loans Receivable [Line Items]
Non-covered loans, gross	30,762	1,449
ACI Loans, Non-Covered | Construction and land
Accounts Notes And Loans Receivable [Line Items]
Non-covered loans, gross	2,007	0
ACI Loans, Non-Covered | Commercial and industrial
Accounts Notes And Loans Receivable [Line Items]
Non-covered loans, gross	1,229	0
ACI Loans, Non-Covered | Commercial finance subsidiaries
Accounts Notes And Loans Receivable [Line Items]
Non-covered loans, gross	0	0
ACI Loans, Non-Covered | Commercial
Accounts Notes And Loans Receivable [Line Items]
Non-covered loans, gross	93,402	14,860
ACI Loans, Non-Covered | Consumer
Accounts Notes And Loans Receivable [Line Items]
Non-covered loans, gross	14	0
ACI Loans, Covered
Accounts Notes And Loans Receivable [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs	897,179	1,291,247
Covered loans, gross	897,179	1,291,247
Covered premiums, discounts and deferred fees and costs, net	0	0
Covered Allowance for loan and lease losses	0	-2,893
Covered loans, net	897,179	1,288,354
ACI Loans, Covered | 1-4 single family residential
Accounts Notes And Loans Receivable [Line Items]
Covered loans, gross	874,522	1,057,012
ACI Loans, Covered | Home equity loans and lines of credit
Accounts Notes And Loans Receivable [Line Items]
Covered loans, gross	22,657	39,602
ACI Loans, Covered | Residential
Accounts Notes And Loans Receivable [Line Items]
Covered loans, gross	897,179	1,096,614
ACI Loans, Covered | Multi-family
Accounts Notes And Loans Receivable [Line Items]
Covered loans, gross	0	33,354
ACI Loans, Covered | Commercial real estate, Owner occupied
Accounts Notes And Loans Receivable [Line Items]
Covered loans, gross	0	49,861
ACI Loans, Covered | Commercial real estate, Non-owner occupied
Accounts Notes And Loans Receivable [Line Items]
Covered loans, gross	0	93,089
ACI Loans, Covered | Construction and land
Accounts Notes And Loans Receivable [Line Items]
Covered loans, gross	0	10,600
ACI Loans, Covered | Commercial and industrial
Accounts Notes And Loans Receivable [Line Items]
Covered loans, gross	0	6,050
ACI Loans, Covered | Commercial finance subsidiaries
Accounts Notes And Loans Receivable [Line Items]
Covered loans, gross	0	0
ACI Loans, Covered | Commercial
Accounts Notes And Loans Receivable [Line Items]
Covered loans, gross	0	192,954
ACI Loans, Covered | Consumer
Accounts Notes And Loans Receivable [Line Items]
Covered loans, gross	0	1,679
Non-ACI Loans, Covered
Accounts Notes And Loans Receivable [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs	146,685	192,641
Covered loans, gross	157,280	205,889
Covered premiums, discounts and deferred fees and costs, net	-10,595	-13,248
Covered Allowance for loan and lease losses	-4,192	-9,502
Covered loans, net	142,493	183,139
Non-ACI Loans, Covered | 1-4 single family residential
Accounts Notes And Loans Receivable [Line Items]
Covered loans, gross	56,138	70,378
Non-ACI Loans, Covered | Home equity loans and lines of credit
Accounts Notes And Loans Receivable [Line Items]
Covered loans, gross	101,142	127,807
Non-ACI Loans, Covered | Residential
Accounts Notes And Loans Receivable [Line Items]
Covered loans, gross	157,280	198,185
Non-ACI Loans, Covered | Multi-family
Accounts Notes And Loans Receivable [Line Items]
Covered loans, gross	0	0
Non-ACI Loans, Covered | Commercial real estate, Owner occupied
Accounts Notes And Loans Receivable [Line Items]
Covered loans, gross	0	689
Non-ACI Loans, Covered | Commercial real estate, Non-owner occupied
Accounts Notes And Loans Receivable [Line Items]
Covered loans, gross	0	52
Non-ACI Loans, Covered | Construction and land
Accounts Notes And Loans Receivable [Line Items]
Covered loans, gross	0	729
Non-ACI Loans, Covered | Commercial and industrial
Accounts Notes And Loans Receivable [Line Items]
Covered loans, gross	0	6,234
Non-ACI Loans, Covered | Commercial finance subsidiaries
Accounts Notes And Loans Receivable [Line Items]
Covered loans, gross	0	0
Non-ACI Loans, Covered | Commercial
Accounts Notes And Loans Receivable [Line Items]
Covered loans, gross	0	7,704
Non-ACI Loans, Covered | Consumer
Accounts Notes And Loans Receivable [Line Items]
Covered loans, gross	$0	$0

Loans_and_Allowance_for_Loan_a3

Loans and Allowance for Loan and Lease Losses (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable Investment Past Due [Line Items]
Capital Leases, Net Investment in Direct Financing Leases	$458,182,000	$340,362,000
Unpaid principal balance of ACI loans	2,600,000,000	3,300,000,000
Purchases of loans	955,995,000	1,141,808,000	709,388,000
Unpaid principal balance of real estate loans pledged as security for FHLB advances	6,900,000,000
Unpaid principal balance of real estate loans pledged as security for FHLB advances	5,500,000,000
Unpaid principal balance of loans sold from pool of ACI loans with zero carrying value	50,000,000	102,000,000	73,000,000
Financing Receivable, Allowance for Credit Losses, Period Increase (Decrease)	10,000,000
Financing receivable credit quality indicator, the value at which relationships are reevaluated at least annually	1,000,000
Carrying value of 1-4 single family residential and home equity ACI loans delinquent more than 90 days and on accrual status	23,000,000	60,000,000
Carrying value of commercial and commercial real estate ACI loans that are delinquent more than 90 days and on accrual status		18,000,000
Maximum percent of one to four single family residential loans of any state not otherwise disclosed (in Percent) (more than)	5.00%
1-4 single family residential
Financing Receivable Investment Past Due [Line Items]
Recorded investment in loans sold	144,231,000	82,160,000	103,127,000
Cash proceeds, net of transaction costs	177,560,000	116,611,000	103,796,000
Net pretax impact on earnings from loans sold	33,329,000	34,451,000	669,000
Percent of loans net of premiums, discounts and deferred fees and costs, covered and non-covered (in Percent)	100.00%	100.00%
Commercial
Financing Receivable Investment Past Due [Line Items]
Recorded investment in loans sold	83,052,000
Cash proceeds, net of transaction costs	101,023,000
Commercial | FLORIDA
Financing Receivable Investment Past Due [Line Items]
Percent of loans net of premiums, discounts and deferred fees and costs, covered and non-covered (in Percent)	48.30%
Commercial | New York
Financing Receivable Investment Past Due [Line Items]
Percent of loans net of premiums, discounts and deferred fees and costs, covered and non-covered (in Percent)	36.60%
New Loans
Financing Receivable Investment Past Due [Line Items]
Non-covered loans, gross	11,230,392,000	7,514,113,000
New Loans | Commercial finance subsidiaries
Financing Receivable Investment Past Due [Line Items]
Non-covered loans, gross	1,456,751,000	952,050,000
New Loans | 1-4 single family residential
Financing Receivable Investment Past Due [Line Items]
Non-covered loans, gross	2,486,272,000	1,800,332,000
Purchases of loans	921,000,000	1,100,000,000
New Loans | Consumer
Financing Receivable Investment Past Due [Line Items]
Non-covered loans, gross	26,293,000	213,107,000
Recorded investment in loans sold	302,800,000
New Loans | Commercial
Financing Receivable Investment Past Due [Line Items]
Non-covered loans, gross	8,716,000,000	5,499,139,000
ACI loans | Commercial real estate
Financing Receivable Investment Past Due [Line Items]
Carrying value of ACI commercial real estate loans at which discount is no longer being accreted		1,000,000
New and Non-ACI loans
Financing Receivable Investment Past Due [Line Items]
Loans 90 days past due and still accruing	$0	$500,000

Loans_and_Allowance_for_Loan_a4

Loans and Allowance for Loan and Lease Losses (Allowance for Credit Losses on Financing Receivables) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance				$69,725				$59,121	$69,725	$59,121	$48,402
Provision for (recovery of) loan losses	20,523	5,387	7,192	8,403	12,512	2,604	4,881	11,967	41,505	31,964	18,896
Charge-offs									-17,454	-25,021	-10,486
Recoveries									1,766	3,661	2,309
Ending Balance	95,542				69,725				95,542	69,725	59,121
Loans net of premiums, discounts and deferred fees and costs	12,414,769				9,053,609				12,414,769	9,053,609
Residential
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance				15,353				19,164	15,353	19,164	10,175
Provision for (recovery of) loan losses									-1,041	243	12,235
Charge-offs									-3,006	-4,144	-3,275
Recoveries									19	90	29
Ending Balance	11,325				15,353				11,325	15,353	19,164
Loans net of premiums, discounts and deferred fees and costs	3,568,529				3,111,167				3,568,529	3,111,167
Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance				52,185				39,543	52,185	39,543	38,176
Provision for (recovery of) loan losses									43,634	29,587	6,301
Charge-offs									-13,041	-20,393	-7,211
Recoveries									1,249	3,448	2,277
Ending Balance	84,027				52,185				84,027	52,185	39,543
Loans net of premiums, discounts and deferred fees and costs	8,819,980				5,720,722				8,819,980	5,720,722
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance				2,187				414	2,187	414	51
Provision for (recovery of) loan losses									-1,088	2,134	360
Charge-offs									-1,407	-484
Recoveries									498	123	3
Ending Balance	190				2,187				190	2,187	414
Loans net of premiums, discounts and deferred fees and costs	26,260				221,720				26,260	221,720
ACI loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance				2,893					2,893
Provision for (recovery of) loan losses									2,311	-2,891	-4,347
Charge-offs									-5,204	-2,235	-3,966
Ending Balance					2,893					2,893
Loans net of premiums, discounts and deferred fees and costs	990,595				1,306,107				990,595	1,306,107
ACI loans | Residential
Allowance for Loan and Lease Losses [Roll Forward]
Loans net of premiums, discounts and deferred fees and costs	897,179				1,096,614				897,179	1,096,614
ACI loans | Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance				2,893					2,893
Provision for (recovery of) loan losses									1,987	-2,891	-4,347
Charge-offs									-4,880	-2,235	-3,966
Ending Balance					2,893					2,893
Loans net of premiums, discounts and deferred fees and costs	93,402				207,814				93,402	207,814
ACI loans | Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Provision for (recovery of) loan losses									324
Charge-offs									-324
Loans net of premiums, discounts and deferred fees and costs	14				1,679				14	1,679
Non-ACI loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance				9,502					9,502
Provision for (recovery of) loan losses									-2,554	1,153	3,844
Charge-offs									-3,496	-4,305	-3,591
Recoveries									740	2,780	1,879
Ending Balance	4,192				9,502				4,192	9,502
Non-ACI loans | Residential
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance				9,070					9,070
Provision for (recovery of) loan losses									-1,891	4,043	6,175
Charge-offs									-3,006	-4,134	-3,275
Recoveries									19	90	29
Ending Balance	4,192				9,070				4,192	9,070
Non-ACI loans | Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance				432					432
Provision for (recovery of) loan losses									-663	-2,890	-2,331
Charge-offs									-490	-171	-316
Recoveries									721	2,690	1,850
Ending Balance					432					432
New Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance				57,330					57,330
Provision for (recovery of) loan losses									41,748	33,702	19,399
Charge-offs									-8,754	-18,481	-2,929
Recoveries									1,026	881	430
Ending Balance	91,350				57,330				91,350	57,330
New Loans | Residential
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance				6,283					6,283
Provision for (recovery of) loan losses									850	-3,800	6,060
Charge-offs										-10
Ending Balance	7,133				6,283				7,133	6,283
New Loans | Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance				48,860					48,860
Provision for (recovery of) loan losses									42,310	35,368	12,979
Charge-offs									-7,671	-17,987	-2,929
Recoveries									528	758	427
Ending Balance	84,027				48,860				84,027	48,860
New Loans | Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance				2,187					2,187
Provision for (recovery of) loan losses									-1,412	2,134	360
Charge-offs									-1,083	-484
Recoveries									498	123	3
Ending Balance	190				2,187				190	2,187
New and Non-ACI loans
Allowance for Loan and Lease Losses [Roll Forward]
Allowance, balance, loans individually evaluated for impairment	7,961				10,322				7,961	10,322
Allowance, balance, loans collectively evaluated for impairment	87,581				56,510				87,581	56,510
Loans individually evaluated for impairment, balance	35,384				28,247				35,384	28,247
Loans collectively evaluated for impairment, balance	11,388,790				7,719,255				11,388,790	7,719,255
Loans net of premiums, discounts and deferred fees and costs	12,414,769				9,053,609				12,414,769	9,053,609
New and Non-ACI loans | Residential
Allowance for Loan and Lease Losses [Roll Forward]
Allowance, balance, loans individually evaluated for impairment	1,083				855				1,083	855
Allowance, balance, loans collectively evaluated for impairment	10,242				14,498				10,242	14,498
Loans individually evaluated for impairment, balance	6,406				5,663				6,406	5,663
Loans collectively evaluated for impairment, balance	2,664,944				2,008,890				2,664,944	2,008,890
New and Non-ACI loans | Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Allowance, balance, loans individually evaluated for impairment	6,878				9,467				6,878	9,467
Allowance, balance, loans collectively evaluated for impairment	77,149				39,825				77,149	39,825
Loans individually evaluated for impairment, balance	28,978				22,584				28,978	22,584
Loans collectively evaluated for impairment, balance	8,697,600				5,490,324				8,697,600	5,490,324
New and Non-ACI loans | Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Allowance, balance, loans collectively evaluated for impairment	190				2,187				190	2,187
Loans collectively evaluated for impairment, balance	$26,246				$220,041				$26,246	$220,041

Loans_and_Allowance_for_Loan_a5

Loans and Allowance for Loan and Lease Losses (Impaired Financing Receivables) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
New Loans
Financing Receivable Impaired [Line Items]
Recorded Investment, Total	$28,978	$20,588
UPB, Total	28,956	20,598
Related Specific Allowance, Impaired loans	6,878	9,467
Average recorded investment in impaired loans	22,072	21,269	14,040
Recorded investment in loans on non-accrual status	28,011	22,724
New Loans | Commercial real estate, Owner occupied
Financing Receivable Impaired [Line Items]
Recorded Investment, With no specific allowance recorded	2,984	1,751
UPB, With no specific allowance recorded	2,961	1,754
Average recorded investment in impaired loans	2,949	0	0
Recorded investment in loans on non-accrual status	3,362	2,785
New Loans | Commercial real estate, Non-owner occupied
Financing Receivable Impaired [Line Items]
Recorded Investment, With no specific allowance recorded	1,326	1,444
UPB, With no specific allowance recorded	1,326	1,444
Average recorded investment in impaired loans	1,385	2,224	1,291
Recorded investment in loans on non-accrual status	1,326	1,444
New Loans | Commercial and industrial
Financing Receivable Impaired [Line Items]
Recorded Investment, With no specific allowance recorded	4,830	0
Recorded Investment, With a specific allowance recorded	11,152	16,048
UPB, With no specific allowance recorded	4,826	0
UPB, With a specific allowance recorded	11,157	16,055
Related Specific Allowance, Impaired loans	4,054	8,696
Average recorded investment in impaired loans	15,058	16,837	7,274
Recorded investment in loans on non-accrual status	13,666	16,448
New Loans | Commercial finance subsidiaries
Financing Receivable Impaired [Line Items]
Recorded Investment, With no specific allowance recorded	1,790	0
Recorded Investment, With a specific allowance recorded	6,896	1,345
UPB, With no specific allowance recorded	1,790	0
UPB, With a specific allowance recorded	6,896	1,345
Related Specific Allowance, Impaired loans	2,824	771
Average recorded investment in impaired loans	2,680	1,478	671
Recorded investment in loans on non-accrual status	9,226	1,534
New Loans | Commercial
Financing Receivable Impaired [Line Items]
Recorded Investment, Total	28,978	20,588
UPB, Total	28,956	20,598
Related Specific Allowance, Impaired loans	6,878	9,467
Average recorded investment in impaired loans	22,072	21,269	14,040
Recorded investment in loans on non-accrual status	27,789	22,455
New Loans | 1-4 single family residential
Financing Receivable Impaired [Line Items]
Average recorded investment in impaired loans	0	0	0
Recorded investment in loans on non-accrual status	49	194
New Loans | Home equity loans and lines of credit
Financing Receivable Impaired [Line Items]
Average recorded investment in impaired loans	0	0	0
Recorded investment in loans on non-accrual status	0	0
New Loans | Residential
Financing Receivable Impaired [Line Items]
Average recorded investment in impaired loans	0	0	0
Recorded investment in loans on non-accrual status	49	194
New Loans | Construction and land
Financing Receivable Impaired [Line Items]
Average recorded investment in impaired loans	0	0	190
Recorded investment in loans on non-accrual status	209	244
New Loans | Multi-family
Financing Receivable Impaired [Line Items]
Average recorded investment in impaired loans	0	730	4,614
New Loans | Consumer
Financing Receivable Impaired [Line Items]
Recorded investment in loans on non-accrual status	173	75
Non-ACI loans
Financing Receivable Impaired [Line Items]
Recorded Investment, Total	6,406	7,659
UPB, Total	7,180	8,366
Related Specific Allowance, Impaired loans	1,083	855
Average recorded investment in impaired loans	6,564	7,809	7,842
Recorded investment in loans on non-accrual status	4,412	9,669
Non-ACI loans | Commercial real estate, Owner occupied
Financing Receivable Impaired [Line Items]
Average recorded investment in impaired loans	0	0	0
Recorded investment in loans on non-accrual status	0	0
Non-ACI loans | Commercial real estate, Non-owner occupied
Financing Receivable Impaired [Line Items]
Average recorded investment in impaired loans	0	0	143
Recorded investment in loans on non-accrual status	0	52
Non-ACI loans | Commercial and industrial
Financing Receivable Impaired [Line Items]
Recorded Investment, With no specific allowance recorded	0	1,996
UPB, With no specific allowance recorded	0	1,999
Average recorded investment in impaired loans	399	2,424	3,749
Recorded investment in loans on non-accrual status	0	2,765
Non-ACI loans | Commercial finance subsidiaries
Financing Receivable Impaired [Line Items]
Average recorded investment in impaired loans	0	0	0
Recorded investment in loans on non-accrual status	0	0
Non-ACI loans | Commercial
Financing Receivable Impaired [Line Items]
Recorded Investment, Total	0	1,996
UPB, Total	0	1,999
Related Specific Allowance, Impaired loans	0
Average recorded investment in impaired loans	399	2,424	4,966
Recorded investment in loans on non-accrual status	0	2,817
Non-ACI loans | 1-4 single family residential
Financing Receivable Impaired [Line Items]
Recorded Investment, With no specific allowance recorded	358	168
Recorded Investment, With a specific allowance recorded	3,493	3,564
UPB, With no specific allowance recorded	426	198
UPB, With a specific allowance recorded	4,158	4,203
Related Specific Allowance, Impaired loans	945	827
Average recorded investment in impaired loans	3,748	3,891	2,757
Recorded investment in loans on non-accrual status	604	293
Non-ACI loans | Home equity loans and lines of credit
Financing Receivable Impaired [Line Items]
Recorded Investment, With no specific allowance recorded	1,621	1,703
Recorded Investment, With a specific allowance recorded	934	228
UPB, With no specific allowance recorded	1,647	1,734
UPB, With a specific allowance recorded	949	232
Related Specific Allowance, Impaired loans	138	28
Average recorded investment in impaired loans	2,417	1,494	119
Recorded investment in loans on non-accrual status	3,808	6,559
Non-ACI loans | Residential
Financing Receivable Impaired [Line Items]
Recorded Investment, Total	6,406	5,663
UPB, Total	7,180	6,367
Related Specific Allowance, Impaired loans	1,083	855
Average recorded investment in impaired loans	6,165	5,385	2,876
Recorded investment in loans on non-accrual status	4,412	6,852
Non-ACI loans | Construction and land
Financing Receivable Impaired [Line Items]
Average recorded investment in impaired loans	0	0	1,074
Recorded investment in loans on non-accrual status	0	0
Non-ACI loans | Multi-family
Financing Receivable Impaired [Line Items]
Average recorded investment in impaired loans	0	0	0
Non-ACI loans | Consumer
Financing Receivable Impaired [Line Items]
Recorded investment in loans on non-accrual status	0	0
ACI loans
Financing Receivable Impaired [Line Items]
Recorded Investment, Total		45,126
UPB, Total		50,419
Related Specific Allowance, Impaired loans		2,893
Average recorded investment in impaired loans	9,026	40,564	79,195
ACI loans | Commercial real estate, Owner occupied
Financing Receivable Impaired [Line Items]
Recorded Investment, With a specific allowance recorded	0	2,643
UPB, With a specific allowance recorded	0	2,812
Related Specific Allowance, Impaired loans	0	369
Average recorded investment in impaired loans	529	3,260	5,754
ACI loans | Commercial real estate, Non-owner occupied
Financing Receivable Impaired [Line Items]
Recorded Investment, With no specific allowance recorded	0	384
Recorded Investment, With a specific allowance recorded	0	32,436
UPB, With no specific allowance recorded	0	406
UPB, With a specific allowance recorded	0	37,392
Related Specific Allowance, Impaired loans	0	1,444
Average recorded investment in impaired loans	6,564	22,883	36,198
ACI loans | Commercial and industrial
Financing Receivable Impaired [Line Items]
Recorded Investment, With a specific allowance recorded	0	3,932
UPB, With a specific allowance recorded	0	4,262
Related Specific Allowance, Impaired loans	0	565
Average recorded investment in impaired loans	786	5,744	12,825
ACI loans | Commercial finance subsidiaries
Financing Receivable Impaired [Line Items]
Average recorded investment in impaired loans	0	0	0
ACI loans | Commercial
Financing Receivable Impaired [Line Items]
Average recorded investment in impaired loans	9,026	40,564	79,195
ACI loans | 1-4 single family residential
Financing Receivable Impaired [Line Items]
Average recorded investment in impaired loans	0	0	0
ACI loans | Home equity loans and lines of credit
Financing Receivable Impaired [Line Items]
Average recorded investment in impaired loans	0	0	0
ACI loans | Residential
Financing Receivable Impaired [Line Items]
Average recorded investment in impaired loans	0	0	0
ACI loans | Construction and land
Financing Receivable Impaired [Line Items]
Recorded Investment, With no specific allowance recorded	0	567
Recorded Investment, With a specific allowance recorded	0	1,686
UPB, With no specific allowance recorded	0	588
UPB, With a specific allowance recorded	0	1,500
Related Specific Allowance, Impaired loans	0	192
Average recorded investment in impaired loans	451	3,873	12,482
ACI loans | Multi-family
Financing Receivable Impaired [Line Items]
Recorded Investment, With a specific allowance recorded	0	3,478
UPB, With a specific allowance recorded	0	3,459
Related Specific Allowance, Impaired loans	0	323
Average recorded investment in impaired loans	$696	$4,804	$11,936

Loans_and_Allowance_for_Loan_a6

Loans and Allowance for Loan and Lease Losses (Financing Receivable Credit Quality Indicators) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable Recorded Investment [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs	$1,043,864	$1,483,888
1-4 single family residential
Financing Receivable Recorded Investment [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs	921,687	1,116,682
New Loans
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	11,277,489	7,554,861
New Loans | 1-4 single family residential
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	2,522,838	1,827,780
New Loans | Commercial
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	8,726,578	5,505,505
New Loans | Commercial | Pass
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	8,649,530	5,461,830
New Loans | Commercial | Special mention
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	24,623	7,892
New Loans | Commercial | Substandard
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	40,914	26,043
New Loans | Commercial | Doubtful
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	11,511	9,740
New Loans | Multi-family
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	1,930,732	1,099,153
New Loans | Multi-family | Pass
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	1,930,324	1,098,383
New Loans | Multi-family | Special mention
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	0	0
New Loans | Multi-family | Substandard
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	408	770
New Loans | Multi-family | Doubtful
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	0	0
New Loans | Commercial real estate, Owner occupied
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	1,009,791	711,534
New Loans | Commercial real estate, Owner occupied | Pass
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	995,062	704,403
New Loans | 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	8,303	0
New Loans | Commercial real estate, Owner occupied | Substandard
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	6,426	7,080
New Loans | 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	51
New Loans | Commercial real estate, Non-owner occupied
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	1,752,079	947,652
New Loans | 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	1,750,753	946,208
New Loans | 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	0	0
New Loans | 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	1,326	1,444
New Loans | 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
New Loans | Construction and land
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	167,138	137,757
New Loans | Construction and land | Pass
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	166,929	137,513
New Loans | 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
New Loans | Construction and land | Substandard
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	209	244
New Loans | Construction and land | Doubtful
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	0	0
New Loans | Commercial and industrial
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	2,400,579	1,652,595
New Loans | Commercial and industrial | Pass
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	2,364,792	1,624,492
New Loans | Commercial and industrial | Special mention
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	9,165	3,513
New Loans | Commercial and industrial | Substandard
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	21,501	15,672
New Loans | Commercial and industrial | Doubtful
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	5,121	8,918
New Loans | Commercial finance subsidiaries
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	1,466,259	956,814
New Loans | Commercial finance subsidiaries | Pass
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	1,441,670	950,831
New Loans | Commercial finance subsidiaries | Special mention
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	7,155	4,379
New Loans | Commercial finance subsidiaries | Substandard
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	11,044	833
New Loans | Commercial finance subsidiaries | Doubtful
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	6,390	771
New Loans | 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	191,199	109,256
New Loans | 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	244,473	171,619
New Loans | 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	403,924	283,671
New Loans | 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	1,683,242	1,263,234
Non-ACI loans
Financing Receivable Recorded Investment [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs	146,685	192,641
Non-ACI loans | 1-4 single family residential
Financing Receivable Recorded Investment [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs	47,165	59,670
Non-ACI loans | Commercial
Financing Receivable Recorded Investment [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs		7,403
Non-ACI loans | Commercial | Pass
Financing Receivable Recorded Investment [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs		4,552
Non-ACI loans | Commercial | Substandard
Financing Receivable Recorded Investment [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs		2,431
Non-ACI loans | Commercial | Doubtful
Financing Receivable Recorded Investment [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs		420
Non-ACI loans | Multi-family
Financing Receivable Recorded Investment [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs		0
Non-ACI loans | Multi-family | Pass
Financing Receivable Recorded Investment [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs		0
Non-ACI loans | Multi-family | Substandard
Financing Receivable Recorded Investment [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs		0
Non-ACI loans | Multi-family | Doubtful
Financing Receivable Recorded Investment [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs		0
Non-ACI loans | Commercial real estate, Owner occupied
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	0
Covered loans net of premiums, discounts and deferred fees and costs		687
Non-ACI loans | Commercial real estate, Owner occupied | Pass
Financing Receivable Recorded Investment [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs		687
Non-ACI loans | Commercial real estate, Owner occupied | Substandard
Financing Receivable Recorded Investment [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs		0
Non-ACI loans | Commercial real estate, Owner occupied | Doubtful
Financing Receivable Recorded Investment [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs		0
Non-ACI loans | Commercial real estate, Non-owner occupied
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	0
Covered loans net of premiums, discounts and deferred fees and costs		52
Non-ACI loans | Commercial real estate, Non-owner occupied | Pass
Financing Receivable Recorded Investment [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs		0
Non-ACI loans | Commercial real estate, Non-owner occupied | Substandard
Financing Receivable Recorded Investment [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs		52
Non-ACI loans | Commercial real estate, Non-owner occupied | Doubtful
Financing Receivable Recorded Investment [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs		0
Non-ACI loans | Construction and land
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	0
Covered loans net of premiums, discounts and deferred fees and costs		688
Non-ACI loans | Construction and land | Pass
Financing Receivable Recorded Investment [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs		688
Non-ACI loans | Construction and land | Substandard
Financing Receivable Recorded Investment [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs		0
Non-ACI loans | Construction and land | Doubtful
Financing Receivable Recorded Investment [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs		0
Non-ACI loans | Commercial and industrial
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	0
Covered loans net of premiums, discounts and deferred fees and costs		5,976
Non-ACI loans | Commercial and industrial | Pass
Financing Receivable Recorded Investment [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs		3,177
Non-ACI loans | Commercial and industrial | Substandard
Financing Receivable Recorded Investment [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs		2,379
Non-ACI loans | Commercial and industrial | Doubtful
Financing Receivable Recorded Investment [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs		420
Non-ACI loans | Commercial finance subsidiaries
Financing Receivable Recorded Investment [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs		0
Non-ACI loans | Commercial finance subsidiaries | Pass
Financing Receivable Recorded Investment [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs		0
Non-ACI loans | Commercial finance subsidiaries | Substandard
Financing Receivable Recorded Investment [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs		0
Non-ACI loans | Commercial finance subsidiaries | Doubtful
Financing Receivable Recorded Investment [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs		0
ACI loans
Financing Receivable Recorded Investment [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs		1,306,107
ACI loans | 1-4 single family residential
Financing Receivable Recorded Investment [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs	874,522	1,057,012
ACI loans | Commercial
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	93,402
Covered loans net of premiums, discounts and deferred fees and costs		207,814
ACI loans | Commercial | Pass
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	90,466
Covered loans net of premiums, discounts and deferred fees and costs		134,162
ACI loans | Commercial | Special mention
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	509
Covered loans net of premiums, discounts and deferred fees and costs		4,361
ACI loans | Commercial | Substandard
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	2,421
Covered loans net of premiums, discounts and deferred fees and costs		69,177
ACI loans | Commercial | Doubtful
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	6
Covered loans net of premiums, discounts and deferred fees and costs		114
ACI loans | Multi-family
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	24,964
Covered loans net of premiums, discounts and deferred fees and costs		41,447
ACI loans | Multi-family | Pass
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	22,762
Covered loans net of premiums, discounts and deferred fees and costs		31,002
ACI loans | Multi-family | Special mention
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	0
Covered loans net of premiums, discounts and deferred fees and costs		0
ACI loans | Multi-family | Substandard
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	2,202
Covered loans net of premiums, discounts and deferred fees and costs		10,445
ACI loans | Multi-family | Doubtful
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	0
Covered loans net of premiums, discounts and deferred fees and costs		0
ACI loans | Commercial real estate, Owner occupied
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	34,440
Covered loans net of premiums, discounts and deferred fees and costs		55,179
ACI loans | Commercial real estate, Owner occupied | Pass
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	34,440
Covered loans net of premiums, discounts and deferred fees and costs		40,725
ACI loans | 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	0
Covered loans net of premiums, discounts and deferred fees and costs		1,000
ACI loans | Commercial real estate, Owner occupied | Substandard
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	0
Covered loans net of premiums, discounts and deferred fees and costs		13,454
ACI loans | 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
Covered loans net of premiums, discounts and deferred fees and costs		0
ACI loans | Commercial real estate, Non-owner occupied
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	30,762
Covered loans net of premiums, discounts and deferred fees and costs		94,538
ACI loans | 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	30,101
Covered loans net of premiums, discounts and deferred fees and costs		53,238
ACI loans | 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	509
Covered loans net of premiums, discounts and deferred fees and costs		3,361
ACI loans | 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	152
Covered loans net of premiums, discounts and deferred fees and costs		37,845
ACI loans | 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
Covered loans net of premiums, discounts and deferred fees and costs		94
ACI loans | Construction and land
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	2,007
Covered loans net of premiums, discounts and deferred fees and costs		10,600
ACI loans | Construction and land | Pass
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	2,007
Covered loans net of premiums, discounts and deferred fees and costs		7,373
ACI loans | Construction and land | Special mention
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	0
Covered loans net of premiums, discounts and deferred fees and costs		0
ACI loans | Construction and land | Substandard
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	0
Covered loans net of premiums, discounts and deferred fees and costs		3,227
ACI loans | Construction and land | Doubtful
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	0
Covered loans net of premiums, discounts and deferred fees and costs		0
ACI loans | Commercial and industrial
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	1,229
Covered loans net of premiums, discounts and deferred fees and costs		6,050
ACI loans | Commercial and industrial | Pass
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	1,156
Covered loans net of premiums, discounts and deferred fees and costs		1,824
ACI loans | Commercial and industrial | Special mention
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	0
Covered loans net of premiums, discounts and deferred fees and costs		0
ACI loans | Commercial and industrial | Substandard
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	67
Covered loans net of premiums, discounts and deferred fees and costs		4,206
ACI loans | Commercial and industrial | Doubtful
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	6
Covered loans net of premiums, discounts and deferred fees and costs		20
ACI loans | Commercial finance subsidiaries
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	0
Covered loans net of premiums, discounts and deferred fees and costs		0
ACI loans | Commercial finance subsidiaries | Pass
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	0
Covered loans net of premiums, discounts and deferred fees and costs		0
ACI loans | Commercial finance subsidiaries | Special mention
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	0
Covered loans net of premiums, discounts and deferred fees and costs		0
ACI loans | Commercial finance subsidiaries | Substandard
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	0
Covered loans net of premiums, discounts and deferred fees and costs		0
ACI loans | Commercial finance subsidiaries | Doubtful
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	0
Covered loans net of premiums, discounts and deferred fees and costs		0
60% or less | New Loans | 1-4 single family residential
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	869,066	658,089
60% or less | New Loans | 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	64,590	37,293
60% or less | New Loans | 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	79,518	60,626
60% or less | New Loans | 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	128,115	86,920
60% or less | New Loans | 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	596,843	473,250
60% - 70% | New Loans | 1-4 single family residential
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	645,258	456,841
60% - 70% | New Loans | 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	55,075	25,861
60% - 70% | New Loans | 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	63,642	45,485
60% - 70% | New Loans | 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	102,054	77,253
60% - 70% | New Loans | 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	424,487	308,242
70% - 80% | New Loans | 1-4 single family residential
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	961,838	668,242
70% - 80% | New Loans | 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	43,316	19,610
70% - 80% | New Loans | 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	98,052	60,021
70% - 80% | New Loans | 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	170,305	116,332
70% - 80% | New Loans | 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	650,165	472,279
More than 80% | New Loans | 1-4 single family residential
Financing Receivable Recorded Investment [Line Items]
Non-covered loans, net of premiums, discounts and deferred fees and costs	46,676	44,608
More than 80% | New Loans | 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	28,218	26,492
More than 80% | New Loans | 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	3,261	5,487
More than 80% | New Loans | 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	3,450	3,166
More than 80% | New Loans | 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	$11,747	$9,463

Loans_and_Allowance_for_Loan_a7

Loans and Allowance for Loan and Lease Losses (Schedule of Financing Receivables Past Due) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable Investment Past Due [Line Items]
Loans net of premiums, discounts and deferred fees and costs	$12,414,769	$9,053,609
Covered loans net of premiums, discounts and deferred fees and costs	1,043,864	1,483,888
1-4 single family residential
Financing Receivable Investment Past Due [Line Items]
Loans net of premiums, discounts and deferred fees and costs	3,444,525	2,944,462
Covered loans net of premiums, discounts and deferred fees and costs	921,687	1,116,682
Consumer
Financing Receivable Investment Past Due [Line Items]
Loans net of premiums, discounts and deferred fees and costs	26,260	221,720
New Loans
Financing Receivable Investment Past Due [Line Items]
Loans, Current	11,259,078	7,541,167
Loans, 30-59 Days Past Due	13,360	4,366
Loans, 60-89 Days Past Due	583	460
Loans, 90 Days or More Past Due or in Foreclosure	4,468	8,868
Non-covered loans, net of premiums, discounts and deferred fees and costs	11,277,489	7,554,861
New Loans | 1-4 single family residential
Financing Receivable Investment Past Due [Line Items]
Loans, Current	2,518,357	1,824,084
Loans, 30-59 Days Past Due	4,432	2,990
Loans, 60-89 Days Past Due	0	109
Loans, 90 Days or More Past Due or in Foreclosure	49	597
Non-covered loans, net of premiums, discounts and deferred fees and costs	2,522,838	1,827,780
New Loans | Home equity loans and lines of credit
Financing Receivable Investment Past Due [Line Items]
Loans, Current	1,827	1,535
Loans, 30-59 Days Past Due	0	0
Loans, 60-89 Days Past Due	0	0
Loans, 90 Days or More Past Due or in Foreclosure	0	0
Non-covered loans, net of premiums, discounts and deferred fees and costs	1,827	1,535
New Loans | Multi-family
Financing Receivable Investment Past Due [Line Items]
Loans, Current	1,929,546	1,099,153
Loans, 30-59 Days Past Due	1,186	0
Loans, 60-89 Days Past Due	0	0
Loans, 90 Days or More Past Due or in Foreclosure	0	0
Non-covered loans, net of premiums, discounts and deferred fees and costs	1,930,732	1,099,153
New Loans | Commercial real estate, Owner occupied
Financing Receivable Investment Past Due [Line Items]
Loans, Current	1,008,576	710,938
Loans, 30-59 Days Past Due	836	0
Loans, 60-89 Days Past Due	0	0
Loans, 90 Days or More Past Due or in Foreclosure	379	596
Non-covered loans, net of premiums, discounts and deferred fees and costs	1,009,791	711,534
New Loans | Commercial real estate, Non-owner occupied
Financing Receivable Investment Past Due [Line Items]
Loans, Current	1,752,079	947,652
Loans, 30-59 Days Past Due	0	0
Loans, 60-89 Days Past Due	0	0
Loans, 90 Days or More Past Due or in Foreclosure	0	0
Non-covered loans, net of premiums, discounts and deferred fees and costs	1,752,079	947,652
New Loans | Construction and land
Financing Receivable Investment Past Due [Line Items]
Loans, Current	167,138	137,757
Loans, 30-59 Days Past Due	0	0
Loans, 60-89 Days Past Due	0	0
Loans, 90 Days or More Past Due or in Foreclosure	0	0
Non-covered loans, net of premiums, discounts and deferred fees and costs	167,138	137,757
New Loans | Commercial and industrial
Financing Receivable Investment Past Due [Line Items]
Loans, Current	2,396,549	1,644,292
Loans, 30-59 Days Past Due	1,696	494
Loans, 60-89 Days Past Due	327	165
Loans, 90 Days or More Past Due or in Foreclosure	2,007	7,644
Non-covered loans, net of premiums, discounts and deferred fees and costs	2,400,579	1,652,595
New Loans | Commercial finance subsidiaries
Financing Receivable Investment Past Due [Line Items]
Loans, Current	1,458,890	956,673
Loans, 30-59 Days Past Due	5,208	116
Loans, 60-89 Days Past Due	246	25
Loans, 90 Days or More Past Due or in Foreclosure	1,915	0
Non-covered loans, net of premiums, discounts and deferred fees and costs	1,466,259	956,814
New Loans | Consumer
Financing Receivable Investment Past Due [Line Items]
Loans, Current	26,116	219,083
Loans, 30-59 Days Past Due	2	766
Loans, 60-89 Days Past Due	10	161
Loans, 90 Days or More Past Due or in Foreclosure	118	31
Non-covered loans, net of premiums, discounts and deferred fees and costs	26,246	220,041
Non-ACI loans
Financing Receivable Investment Past Due [Line Items]
Loans, Current	139,386	177,433
Loans, 30-59 Days Past Due	2,341	5,546
Loans, 60-89 Days Past Due	1,109	853
Loans, 90 Days or More Past Due or in Foreclosure	3,849	8,809
Covered loans net of premiums, discounts and deferred fees and costs	146,685	192,641
Non-ACI loans | 1-4 single family residential
Financing Receivable Investment Past Due [Line Items]
Loans, Current	45,959	56,248
Loans, 30-59 Days Past Due	602	3,129
Loans, 60-89 Days Past Due	563	293
Loans, 90 Days or More Past Due or in Foreclosure	41	0
Covered loans net of premiums, discounts and deferred fees and costs	47,165	59,670
Non-ACI loans | Home equity loans and lines of credit
Financing Receivable Investment Past Due [Line Items]
Loans, Current	93,427	116,036
Loans, 30-59 Days Past Due	1,739	2,417
Loans, 60-89 Days Past Due	546	556
Loans, 90 Days or More Past Due or in Foreclosure	3,808	6,559
Covered loans net of premiums, discounts and deferred fees and costs	99,520	125,568
Non-ACI loans | Multi-family
Financing Receivable Investment Past Due [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs		0
Non-ACI loans | Commercial real estate, Owner occupied
Financing Receivable Investment Past Due [Line Items]
Loans, Current	0	687
Loans, 30-59 Days Past Due	0	0
Loans, 60-89 Days Past Due	0	0
Loans, 90 Days or More Past Due or in Foreclosure	0	0
Covered loans net of premiums, discounts and deferred fees and costs		687
Non-covered loans, net of premiums, discounts and deferred fees and costs	0
Non-ACI loans | Commercial real estate, Non-owner occupied
Financing Receivable Investment Past Due [Line Items]
Loans, Current	0	52
Loans, 30-59 Days Past Due	0	0
Loans, 60-89 Days Past Due	0	0
Loans, 90 Days or More Past Due or in Foreclosure	0	0
Covered loans net of premiums, discounts and deferred fees and costs		52
Non-covered loans, net of premiums, discounts and deferred fees and costs	0
Non-ACI loans | Construction and land
Financing Receivable Investment Past Due [Line Items]
Loans, Current	0	688
Loans, 30-59 Days Past Due	0	0
Loans, 60-89 Days Past Due	0	0
Loans, 90 Days or More Past Due or in Foreclosure	0	0
Covered loans net of premiums, discounts and deferred fees and costs		688
Non-covered loans, net of premiums, discounts and deferred fees and costs	0
Non-ACI loans | Commercial and industrial
Financing Receivable Investment Past Due [Line Items]
Loans, Current	0	3,722
Loans, 30-59 Days Past Due	0	0
Loans, 60-89 Days Past Due	0	4
Loans, 90 Days or More Past Due or in Foreclosure	0	2,250
Covered loans net of premiums, discounts and deferred fees and costs		5,976
Non-covered loans, net of premiums, discounts and deferred fees and costs	0
Non-ACI loans | Commercial finance subsidiaries
Financing Receivable Investment Past Due [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs		0
ACI loans
Financing Receivable Investment Past Due [Line Items]
Loans, Current	943,253	1,178,933
Loans, 30-59 Days Past Due	19,033	37,715
Loans, 60-89 Days Past Due	4,814	10,809
Loans, 90 Days or More Past Due or in Foreclosure	23,495	78,650
Loans net of premiums, discounts and deferred fees and costs	990,595	1,306,107
Covered loans net of premiums, discounts and deferred fees and costs		1,306,107
ACI loans | 1-4 single family residential
Financing Receivable Investment Past Due [Line Items]
Loans, Current	829,412	957,791
Loans, 30-59 Days Past Due	18,463	33,067
Loans, 60-89 Days Past Due	4,689	10,279
Loans, 90 Days or More Past Due or in Foreclosure	21,958	55,875
Covered loans net of premiums, discounts and deferred fees and costs	874,522	1,057,012
ACI loans | Home equity loans and lines of credit
Financing Receivable Investment Past Due [Line Items]
Loans, Current	20,474	33,967
Loans, 30-59 Days Past Due	558	1,150
Loans, 60-89 Days Past Due	125	329
Loans, 90 Days or More Past Due or in Foreclosure	1,500	4,156
Covered loans net of premiums, discounts and deferred fees and costs	22,657	39,602
ACI loans | Multi-family
Financing Receivable Investment Past Due [Line Items]
Loans, Current	24,964	38,877
Loans, 30-59 Days Past Due	0	0
Loans, 60-89 Days Past Due	0	0
Loans, 90 Days or More Past Due or in Foreclosure	0	2,570
Covered loans net of premiums, discounts and deferred fees and costs		41,447
Non-covered loans, net of premiums, discounts and deferred fees and costs	24,964
ACI loans | Commercial real estate, Owner occupied
Financing Receivable Investment Past Due [Line Items]
Loans, Current	34,440	54,501
Loans, 30-59 Days Past Due	0	253
Loans, 60-89 Days Past Due	0	0
Loans, 90 Days or More Past Due or in Foreclosure	0	425
Covered loans net of premiums, discounts and deferred fees and costs		55,179
Non-covered loans, net of premiums, discounts and deferred fees and costs	34,440
ACI loans | Commercial real estate, Non-owner occupied
Financing Receivable Investment Past Due [Line Items]
Loans, Current	30,746	81,754
Loans, 30-59 Days Past Due	9	3,245
Loans, 60-89 Days Past Due	0	0
Loans, 90 Days or More Past Due or in Foreclosure	7	9,539
Covered loans net of premiums, discounts and deferred fees and costs		94,538
Non-covered loans, net of premiums, discounts and deferred fees and costs	30,762
ACI loans | Construction and land
Financing Receivable Investment Past Due [Line Items]
Loans, Current	2,007	7,373
Loans, 30-59 Days Past Due	0	0
Loans, 60-89 Days Past Due	0	0
Loans, 90 Days or More Past Due or in Foreclosure	0	3,227
Covered loans net of premiums, discounts and deferred fees and costs		10,600
Non-covered loans, net of premiums, discounts and deferred fees and costs	2,007
ACI loans | Commercial and industrial
Financing Receivable Investment Past Due [Line Items]
Loans, Current	1,196	3,193
Loans, 30-59 Days Past Due	3	0
Loans, 60-89 Days Past Due	0	0
Loans, 90 Days or More Past Due or in Foreclosure	30	2,857
Covered loans net of premiums, discounts and deferred fees and costs		6,050
Non-covered loans, net of premiums, discounts and deferred fees and costs	1,229
ACI loans | Commercial finance subsidiaries
Financing Receivable Investment Past Due [Line Items]
Covered loans net of premiums, discounts and deferred fees and costs		0
Non-covered loans, net of premiums, discounts and deferred fees and costs	0
ACI loans | Consumer
Financing Receivable Investment Past Due [Line Items]
Loans, Current	14	1,477
Loans, 30-59 Days Past Due	0	0
Loans, 60-89 Days Past Due	0	201
Loans, 90 Days or More Past Due or in Foreclosure	0	1
Loans net of premiums, discounts and deferred fees and costs	14	1,679
Covered loans net of premiums, discounts and deferred fees and costs		1,679
Non-covered loans, net of premiums, discounts and deferred fees and costs	$14

FDIC_Indemnification_Asset_Gai

FDIC Indemnification Asset (Gains and Losses Associated with Covered Assets) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Guarantor Obligations [Line Items]
Recovery of losses on covered loans	$33	$1,738	$503
Income from resolution of covered assets, net	49,082	78,862	51,016
Gain (loss) on sale of covered loans	20,369	-16,195	-29,270
Gain (loss) on covered investment securities available for sale	209	-963
(Gain) loss on covered OREO	2,744	7,629	-5,762
Gain (Loss) Associated With Covered Assets	72,437	71,071	16,487
Provision For Unfunded Commitments	-210
Net Loss on FDIC Indemnification
Guarantor Obligations [Line Items]
Recovery of losses on covered loans	-54	-1,574	344
Income from resolution of covered assets, net	-39,127	-64,793	-41,962
Gain (loss) on sale of covered loans	-5,338	21,021	30,725
Gain (loss) on covered investment securities available for sale	-167	770
(Gain) loss on covered OREO	-1,710	-6,062	4,863
Gain (Loss) Associated With Covered Assets	-46,396	-50,638	-6,030
Net Impact on Pre-tax Earnings
Guarantor Obligations [Line Items]
Recovery of losses on covered loans	-21	164	847
Income from resolution of covered assets, net	9,955	14,069	9,054
Gain (loss) on sale of covered loans	15,031	4,826	1,455
Gain (loss) on covered investment securities available for sale	42	-193
(Gain) loss on covered OREO	1,034	1,567	-899
Gain (Loss) Associated With Covered Assets	$26,041	$20,433	$10,457

FDIC_Indemnification_Asset_Cha

FDIC Indemnification Asset (Changes in the FDIC Indemnification Asset) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
FDIC Indemnification Asset [Roll Forward]
FDIC Indemnification Asset and Liability, net	$1,205,117	$1,457,570	$2,049,151
Amortization	-69,470	-36,943	15,306
Reduction for claims filed	-114,916	-164,872	-600,857
Net loss on FDIC indemnification	-46,396	-50,638	-6,030
FDIC Indemnification Asset and Liability, net	974,335	1,205,117	1,457,570
FDIC indemnification asset	974,704	1,205,117
Other Liabilities	($369)

Equipment_Under_Operating_Leas2

Equipment Under Operating Lease (Schedule of Equipment Under Operating Lease) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Leases [Abstract]
Equipment under operating lease	$324,295	$201,163
Less: accumulated depreciation	-9,737	-4,680
Equipment under operating lease, net	$314,558	$196,483

Equipment_Under_Operating_Leas3

Equipment Under Operating Lease (Narrative) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Leases [Abstract]
Operating Leases, Income Statement, Depreciation Expense on Property Subject to or Held-for-lease	$8.80	$4.30	$0.40

Equipment_Under_Operating_Leas4

Equipment Under Operating Lease (Schedule of Future Minimum Rental Payments) (Details) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Years Ending December 31:
2015	$23,902
2016	23,792
2017	21,583
2018	18,992
2019	16,511
Thereafter through 2024	24,243
Total	$129,023

Other_Real_Estate_Owned_Schedu

Other Real Estate Owned (Schedule of OREO, Roll Forward) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other Real Estate [Roll Forward]
Beginning Balance	$40,570	$76,022	$123,737
Transfers from loan portfolio	26,564	68,084	151,302
Sales	-52,119	-101,597	-189,091
Impairment	-1,235	-1,939	-9,926
Ending Balance	$13,780	$40,570	$76,022

Premises_and_Equipment_and_Lea2

Premises and Equipment and Lease Commitments (Summary of Premises and Equipment) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$166,993	$137,201
Less: accumulated depreciation	-61,808	-42,923
Premises and equipment, net	105,185	94,278
Buildings and improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	25,739	18,049
Leasehold improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	61,336	47,912
Construction in progress
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	149	3,293
Furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	34,542	29,880
Computer equipment
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	13,555	11,212
Software and software licensing rights
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$31,672	$26,855

Premises_and_Equipment_and_Lea3

Premises and Equipment and Lease Commitments (Narrative) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Premises and Equipment and Lease Commitments [Abstract]
Amount included in buildings and improvements recorded under capital lease	$11	$2
Depreciation and amortization expense related to premises and equipment	22.1	18.2	14
Rent expense under operating leases	$25.40	$26	$23.30

Premises_and_Equipment_and_Lea4

Premises and Equipment and Lease Commitments (Schedule of Future Minimum Rentals Under Non-Cancelable Operating Leases) (Details) (Land And Building, USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Land And Building
Operating Leased Assets [Line Items]
2015	$20,834
2016	20,350
2017	20,188
2018	18,989
2019	17,383
Thereafter through 2034	81,756
Operating leases due, total	$179,500

Deposits_Summary_of_Average_Ba

Deposits (Summary of Average Balances and Weighted Average Rates Paid on Deposits) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Demand deposits:
Non-interest bearing, Average Balance	$2,366,621	$1,586,007	$1,099,448
Interest bearing, Average Balance	773,655	582,623	504,614
Non-interest bearing, Average Rate (in Percent)	0.00%	0.00%	0.00%
Interest-bearing, Average Rate (in Percent)	0.42%	0.46%	0.63%
Money market, Average Balance	4,444,753	3,403,276	2,838,735
Savings, Average Balance	647,691	877,255	1,073,709
Time, Average Balance	3,716,611	2,844,377	2,632,451
Total, Average Balance	$11,949,331	$9,293,538	$8,148,957
Money market, Average Rate (in Percent)	0.54%	0.51%	0.63%
Savings, Average Rate (in Percent)	0.30%	0.37%	0.58%
Time, Average Rate (in Percent)	1.18%	1.31%	1.48%
Total, Average Rate (in Percent)	0.61%	0.65%	0.81%

Deposits_Narrative_Details

Deposits (Narrative) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Banking and Thrift [Abstract]
Time deposit accounts with balances of $100,000 or more	$2,879,934,000	$2,100,000,000
Time deposit accounts with balances of $250,000 or more	1,300,000,000	829,000,000
Public funds deposits included in deposits	1,800,000,000
Brokered deposits included in deposits	345,000,000
Carrying value of investment securities available for sale pledged as security for time deposits issued to State of Florida and other public funds deposits	456,000,000
Letter of credit issued by FHLB pledged as security for public funds deposits	$400,000,000

Deposits_Schedule_of_Maturitie

Deposits (Schedule of Maturities of Time Deposits with Balances Equal or Greater than 100000) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Banking and Thrift [Abstract]
2015	$3,205,042
2016	478,714
2017	289,236
2018	11,023
2019	17,774
Thereafter through 2023	136
Total time deposits	$4,001,925	$3,282,027

Deposits_Schedule_of_Interest_

Deposits (Schedule of Interest Expense on Deposits) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Banking and Thrift [Abstract]
Interest bearing demand	$3,254	$2,698	$3,155
Money market	23,944	17,355	17,878
Savings	1,971	3,265	6,215
Time	43,792	37,248	38,930
Total interest expense on deposits	$72,961	$60,566	$66,178

Federal_Home_Loan_Bank_Advance2

Federal Home Loan Bank Advances and Other Borrowings (Schedule of Outstanding FHLB Advances and Other Borrowings) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Advances from Federal Home Loan Banks [Abstract]
FHLB advances	$3,307,932	$2,412,050
Securities sold under agreements to repurchase	0	346
Capital lease obligations	10,627	1,917
FHLB Advances and Other Borrowings, Total	$3,318,559	$2,414,313

Federal_Home_Loan_Bank_Advance3

Federal Home Loan Bank Advances and Other Borrowings (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Advances from Federal Home Loan Banks [Abstract]
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements	$21,000,000	$23,000,000
FHLB advances, amount outstanding, modified			105,000,000
FHLB advances, modification fees incurred			5,300,000
Pre-payment of FHLB advances			520,000,000
Carrying value of pre-payment of FHLB advances			524,000,000
Aggregate cash payment of FHLB advances			538,000,000
Loss on extinguishment of debt	0	0	14,175,000
Interest expense increased (reduced) from amortization of fair value adjustment	882,000	131,000	-14,800,000
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	100.00%
Pledged Financial Instruments, Not Separately Reported, Securities for Federal Home Loan Bank	5,900,000,000
Available borrowing capacity	1,500,000,000
Federal Reserve Bank Advances
Debt Instrument [Line Items]
Unused borrowing capacity	88,000,000
Federal Funds Lines of Credit
Debt Instrument [Line Items]
Unused borrowing capacity	$175,000,000

Federal_Home_Loan_Bank_Advance4

Federal Home Loan Bank Advances and Other Borrowings (Schedule of Outstanding FHLB Advances) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Advances from Federal Home Loan Banks [Abstract]
Maturing in 2015 - 31 days or less	$525,000
Maturing in 2015 - Over 31 days	2,080,350
Maturing in 2016	450,000
Maturing in 2017	255,000
Total contractual balance outstanding	3,310,350
Unamortized modification costs	-2,418
Carrying value	$3,307,932	$2,412,050
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Maturing in 2015 - 31 days or less, Weighted Average Rate (in Percent)	0.22%
Maturing in 2015 - Over 31 days, Weighted Average Rate (in Percent)	0.31%
Maturing in 2016, Weighted Average Rate (in Percent)	0.63%
Maturing in 2017, Weighted Average Rate (in Percent)	1.05%
Minimum
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Maturing in 2015 - 31 days or less, range of interest rates (in Percent)	0.17%
Maturing in 2015 - Over 31 days, range of interest rates (in Percent)	0.00%
Maturing in 2016, range of interest rates (in Percent)	0.51%
Maturing in 2017, range of interest rates (in Percent)	0.95%
Maximum
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Maturing in 2015 - 31 days or less, range of interest rates (in Percent)	0.26%
Maturing in 2015 - Over 31 days, range of interest rates (in Percent)	0.79%
Maturing in 2016, range of interest rates (in Percent)	0.79%
Maturing in 2017, range of interest rates (in Percent)	1.31%

Income_Taxes_Schedule_of_Compo

Income Taxes (Schedule of Components of the Provision for Income Taxes) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Current federal									$121,063	$94,724	$170,973
Current state									7,549	6,105	34,860
Total Current									128,612	100,829	205,833
Deferred:
Deferred federal									-27,468	5,028	-60,985
Deferred state									-12,109	3,209	-11,243
Total Deferred									-39,577	8,237	-72,228
Provision for income taxes	$14,702	$19,813	$24,001	$30,519	$20,996	$24,248	$32,894	$30,928	$89,035	$109,066	$133,605

Income_Taxes_Narrative_Details

Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Statutory federal income tax rate (in Percent)	35.00%	35.00%	35.00%
Operating Loss Carryforwards [Line Items]
Net operating loss and tax credit carryforwards	$10,525,000	$6,894,000
Tax Credit Carryforward [Line Items]
Tax benefit recognized, net operating loss	800,000	800,000	800,000
Deferred State and Local Income Tax Benefit, Tax Law Changes	2,400,000
Unrecognized state tax benefits that if recognized would have impacted the effective tax rate	21,300,000	10,000,000	11,700,000
Unrecognized tax benefits that may decrease subsequent to current period	5,800,000
Accrued interest and penalties, net of federal and state tax benefits	3,200,000	5,500,000
Accrued interest and penalties, recognized through income tax expense	-2,300,000	-300,000	2,100,000
Reversal of interest and penalties due to lapse of the statute of limitations	3,200,000	1,400,000
General Business Tax Credit Carryforward
Tax Credit Carryforward [Line Items]
Tax Credit Carryforward, Amount	1,600,000
Internal Revenue Service (IRS)
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	16,900,000
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	85,700,000
Net operating loss and tax credit carryforwards	$2,900,000

Income_Taxes_Schedule_of_Effec

Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Tax expense calculated at the statutory federal income tax rate, Amount									$102,637	$111,301	$120,703
Tax expense calculated at the statutory federal income tax rate, Percent									35.00%	35.00%	35.00%
Increases (decreases) resulting from:
Income not subject to tax, Amount									-10,056	-7,065	-6,019
State income taxes, net of federal tax benefit, Amount									6,259	9,896	12,967
Uncertain tax positions - lapse of statute of limitations, Amount									-5,098	-3,597	0
Other, net, Amount									-4,707	-1,469	5,954
Provision for income taxes	$14,702	$19,813	$24,001	$30,519	$20,996	$24,248	$32,894	$30,928	$89,035	$109,066	$133,605
Income not subject to tax, Percent									-3.43%	-2.22%	-1.75%
State income taxes, net of federal tax benefit, Percent									2.13%	3.11%	3.76%
Uncertain tax positions - lapse of statute of limitations, Percent									-1.74%	-1.13%	0.00%
Other, net, Percent									-1.60%	-0.46%	1.73%
Income tax expense, Percent									30.36%	34.30%	38.74%

Income_Taxes_Schedule_of_Defer

Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Deferred tax assets:
Excess of tax basis over carrying value of acquired loans	$152,870	$199,715
Allowance for loan and lease losses	37,091	26,639
Acquisition costs	11,257	12,119
Net operating loss and tax credit carryforwards	10,525	6,894
Net unrealized losses on derivatives designated as cash flow hedges	13,836	7,080
Other	21,171	19,210
Gross deferred tax assets	246,750	271,657
Deferred tax liabilities:
Deferred tax gain resulting from the FSB Acquisition	0	107,512
Net unrealized gains on investment securities available for sale	43,123	43,177
Lease financing, due to differences in depreciation	71,024	34,624
Premises and equipment, due to differences in depreciation	8,851	10,457
Other	6,537	5,261
Gross deferred tax liabilities	129,535	201,031
Net deferred tax asset	$117,215	$70,626

Income_Taxes_Schedule_of_Unrec

Income Taxes (Schedule of Unrecognized Tax Benefits, Roll Forward) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance, beginning of period	$21,898	$24,790	$20,961
Additions for tax positions related to the current year	3,797	699	1,246
Additions for tax positions related to prior periods	22,089	0	0
Reductions due to settlements with taxing authorities	-3,807	0	-41
Reductions due to lapse of the statute of limitations	-4,739	-3,340	0
Increases and decreases	39,238	22,149	22,166
Interest and penalties	-2,616	-251	2,624
Balance, end of period	$36,622	$21,898	$24,790

Derivatives_and_Hedging_Activi2

Derivatives and Hedging Activities (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Life of certificates of deposit hedged (in Years)	1 year
Discontinuation of Cash Flow Hedge	0	0
Gains and losses reported in AOCI that were reclassified into earnings as a result of discontinuance of cash flow hedges or early extinguishment of debt	$0	$0
Discontinuation of cash flow hedge, notional amount			120,000,000
Amount of gain (loss) related to termination of cash flow hedges reclassified from AOCI into non-interest income during the period		0	-8,701,000
Amount expected to be reclassified from AOCI into income	22,900,000
Available for Sale Securities Pledged as Collateral for Interest Rate Swaps	53,000,000
Cash pledged as collateral for interest rate swaps	33,000,000
Mortgage loan commitment time period, minimum (in Duration)	30 days
Mortgage loan commitment time period, maximum (in Duration)	75 days
Derivative [Line Items]
Derivative, Notional Amount	3,104,736,000	2,297,502,000
Mortgage Loan Funding Commitment
Derivative [Line Items]
Derivative, Notional Amount	3,000,000	3,000,000
Forward Loan Sale Commitment Derivative
Derivative [Line Items]
Derivative, Notional Amount	$1,400,000	$200,000

Derivatives_and_Hedging_Activi3

Derivatives and Hedging Activities (Interest Rate Contract Derivative Financial Instruments and Related Hedged Items) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Derivatives Fair Value [Line Items]
Notional amount of interest rate swap derivatives	$3,104,736	$2,297,502
Interest rate derivative assets, fair value	29,765	21,831
Interest rate derivative liabilities, fair value	-69,177	-43,788
Derivatives designated as cash flow hedges | Pay-Fixed interest Rate Swaps - CDs
Derivatives Fair Value [Line Items]
Weighted average fixed rate of interest rate swaps (in Percent)	3.11%	3.11%
Description of variable rate (in Description)	12-Month Libor	12-Month Libor
Weighted average remaining maturity of interest rate swap derivatives (in Duration)	0 years 10 months 6 days	1 year 10 months 24 days
Notional amount of interest rate swap derivatives	225,000	225,000
Derivatives designated as cash flow hedges | Pay-Fixed interest Rate Swaps - CDs | Other Liabilities
Derivatives Fair Value [Line Items]
Interest rate derivative liabilities, fair value	-5,741	-10,591
Derivatives designated as cash flow hedges | Pay-Fixed interest rate swaps - Borrowings
Derivatives Fair Value [Line Items]
Weighted average fixed rate of interest rate swaps (in Percent)	1.61%	1.61%
Description of variable rate (in Description)	3-Month Libor	3-Month Libor
Weighted average remaining maturity of interest rate swap derivatives (in Duration)	2 years 10 months 1 day	3 years 9 months 18 days
Notional amount of interest rate swap derivatives	1,505,000	1,505,000
Derivatives designated as cash flow hedges | Pay-Fixed interest rate swaps - Borrowings | Other Liabilities
Derivatives Fair Value [Line Items]
Interest rate derivative liabilities, fair value	-19,639	-28,326
Derivatives designated as cash flow hedges | Pay-Fixed interest rate swaps - Borrowings | Other Assets
Derivatives Fair Value [Line Items]
Interest rate derivative assets, fair value	4,083	16,960
Derivatives designated as cash flow hedges | Pay-Fixed Forward-Starting Swap - Borrowings
Derivatives Fair Value [Line Items]
Weighted average fixed rate of interest rate swaps (in Percent)	3.43%
Description of variable rate (in Description)	3-Month Libor
Weighted average remaining maturity of interest rate swap derivatives (in Duration)	12 years 5 months 16 days
Notional amount of interest rate swap derivatives	300,000
Derivatives designated as cash flow hedges | Pay-Fixed Forward-Starting Swap - Borrowings | Other Liabilities
Derivatives Fair Value [Line Items]
Interest rate derivative liabilities, fair value	-18,115
Derivatives not designated as hedges | Pay-fixed interest rate swaps and caps
Derivatives Fair Value [Line Items]
Weighted average fixed rate of interest rate swaps (in Percent)	4.34%	4.62%
Description of variable rate (in Description)	Indexed to 1-month Libor	Indexed to 1-month Libor
Weighted average remaining maturity of interest rate swap derivatives (in Duration)	6 years 4 months 6 days	6 years 4 months 24 days
Notional amount of interest rate swap derivatives	537,368	283,751
Derivatives not designated as hedges | Pay-fixed interest rate swaps and caps | Other Liabilities
Derivatives Fair Value [Line Items]
Interest rate derivative liabilities, fair value	-25,622	-3,816
Derivatives not designated as hedges | Pay-fixed interest rate swaps and caps | Other Assets
Derivatives Fair Value [Line Items]
Interest rate derivative assets, fair value	60	1,055
Derivatives not designated as hedges | Pay-variable interest rate swaps and caps
Derivatives Fair Value [Line Items]
Weighted average fixed rate of interest rate swaps (in Percent)	4.34%	4.62%
Description of variable rate (in Description)	Indexed to 1-month Libor	Indexed to 1-month Libor
Weighted average remaining maturity of interest rate swap derivatives (in Duration)	6 years 4 months 6 days	6 years 4 months 24 days
Notional amount of interest rate swap derivatives	537,368	283,751
Derivatives not designated as hedges | Pay-variable interest rate swaps and caps | Other Liabilities
Derivatives Fair Value [Line Items]
Interest rate derivative liabilities, fair value	-60	-1,055
Derivatives not designated as hedges | Pay-variable interest rate swaps and caps | Other Assets
Derivatives Fair Value [Line Items]
Interest rate derivative assets, fair value	$25,622	$3,816

Derivatives_and_Hedging_Activi4

Derivatives and Hedging Activities (Gains and Losses Related to Interest Rate Contract Derivative Instruments) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Amount of loss reclassified from AOCI into interest expense during the period (effective portion)	($26,671)	($21,827)	($17,962)
Amount of loss related to termination of cash flow hedges reclassified from AOCI into non-interest income during the period		0	-8,701
Amount of gain (loss) recognized in income during the period (ineffective portion)	$0	$0	$0

Derivatives_and_Hedging_Activi5

Derivatives and Hedging Activities (Interest Rate Swaps Subject to Master Netting Agreements) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Gross Amounts Recognized, Derivative assets	$4,143	$18,015
Gross Amounts Recognized, Derivative liabilities	-69,117	-42,733
Gross Amounts Recognized, Derivative assets and liabilities	-64,974	-24,718
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	4,143	18,015
Net Amounts Presented in Balance Sheet, Derivative liabilities	-69,117	-42,733
Net Amounts Presented in Balance Sheet, Derivative assets and liabilities	-64,974	-24,718
Gross Amounts Not Offset in Balance Sheet
Derivative Instruments, Derivative assets	-4,143	-2,010
Derivative Instruments, Derivative liabilities	4,143	2,010
Derivative Instruments, Derivative assets and liabilities	0	0
Collateral Pledged, Derivative assets	0	-14,714
Collateral Pledged, Derivative liabilities	64,974	40,723
Collateral Pledged, Derivative assets and liabilities	64,974	26,009
Net Amount, Derivative assets	0	1,291
Net Amount, Derivative liabilities	0	0
Net Amount, Derivative assets and liabilities	$0	$1,291

Stockholders_Equity_Narrative_

Stockholders' Equity (Narrative) (Details)	0 Months Ended
	Feb. 29, 2012	Feb. 29, 2012
Equity [Abstract]
Warrants issued in conjunction with acquisition of Herald (in Shares)	1,834,160
Exercise price of warrants issued in conjunction with acquisition of Herald (in Dollars per Unit)		9.47
Shares of common stock called by each warrant (in Shares)	0.0827
Cash amount holder entitled to receive per warrant (in Dollars per Unit)	1.73

Stockholders_Equity_Changes_in

Stockholders' Equity (Changes in Accumulated Other Comprehensive Income) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Unrealized gains on investment securities available for sale:
Net unrealized holding gain (loss) arising during the period, Before Tax	$3,134	($64,330)	$112,165
Amounts reclassified to gain on investment securities available for sale, net, Before Tax	-3,859	-8,629	-17,039
Net change in unrealized gains on securities available for sale, Before Tax	-725	-72,959	95,126
Net unrealized holding gain (loss) arising during the period, Tax Effect	-1,195	24,784	-43,272
Amounts reclassified to gain on investment securities available for sale, net, Tax Effect	1,489	3,329	6,573
Net change in unrealized gains on securities available for sale, Tax Effect	294	28,113	-36,699
Net unrealized holding gain (loss) arising during the period, Net of Tax	1,939	-39,546	68,893
Amounts reclassified to gain on investment securities available for sale, net, Net of Tax	-2,370	-5,300	-10,466
Net change in unrealized gains on securities available for sale	-431	-44,846	58,427
Unrealized losses on derivative instruments:
Net unrealized holding gain (loss) arising during the period, Before Tax	-44,086	8,046	-14,405
Amounts reclassified to interest expense on deposits, Before Tax	5,675	5,140	4,904
Amounts reclassified to interest expense on borrowings, Before Tax	20,996	16,687	13,058
Amounts reclassified to loss on termination of interest rate swap, Before Tax			8,701
Net change in unrealized losses on derivative instruments, Before Tax	-17,415	29,873	12,258
Net unrealized holding gain (loss) arising during the period, Tax Effect	17,006	-3,104	5,557
Amounts reclassified to interest expense on deposits, Tax Effect	-2,189	-1,982	-1,892
Amounts reclassified to interest expense on borrowings, Tax Effect	-8,099	-6,437	-5,037
Amounts reclassified to loss on termination of interest rate swap, Tax Effect			-3,356
Net change in unrealized losses on derivative instruments, Tax Effect	6,718	-11,523	-4,728
Net unrealized holding gain (loss) arising during the period, Net of Tax	-27,080	4,942	-8,848
Amounts reclassified to interest expense on deposits, Net of Tax	3,486	3,158	3,012
Amounts reclassified to interest expense on borrowings, Net of Tax	12,897	10,250	8,021
Amounts reclassified to loss on termination of interest rate swap, Net of Tax			5,345
Net change in unrealized losses on derivative instruments	-10,697	18,350	7,530
Other comprehensive income (loss), Before Tax	-18,140	-43,086	107,384
Other comprehensive income (loss), Tax Effect	7,012	16,590	-41,427
Other comprehensive income (loss)	($11,128)	($26,496)	$65,957

Stockholders_Equity_Categories

Stockholders' Equity (Categories of Other Comprehensive Income) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Other comprehensive income, Beginning Balance	$57,480	$83,976	$18,019
Other comprehensive income	-11,128	-26,496	65,957
Other comprehensive income, Ending Balance	46,352	57,480	83,976
Unrealized Gains on Investment Securities Available for Sale
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Other comprehensive income, Beginning Balance	68,753	113,599	55,172
Other comprehensive income	-431	-44,846	58,427
Other comprehensive income, Ending Balance	68,322	68,753	113,599
Unrealized Losses on Derivative Instruments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Other comprehensive income, Beginning Balance	-11,273	-29,623	-37,153
Other comprehensive income	-10,697	18,350	7,530
Other comprehensive income, Ending Balance	($21,970)	($11,273)	($29,623)

Equity_Based_Compensation_Narr

Equity Based Compensation (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$15,633,000	$13,778,000	$23,802,000
Shares granted, vesting period (Duration)	10 years
Cash dividends declared per common share (in Dollars per Share)	$0.84	$0.84	$0.72
Option awards outstanding (in Shares)	5,015,047	5,070,939	5,698,788			5,738,122
Options exercised, intrinsic value	900,000	6,100,000	2,600,000
Other Liabilities
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Deferred compensation liability, current and noncurrent	6,000,000	2,000,000
Deferred compensation plan
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Rate of annual interest accrued for defined compensation plan (in Percent)		6.00%	6.00%
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%
Vesting period of employer contributions (in Duration)	2 years
Elected, specified, period at which distributions can be made, from date of deferral and matching, except for the provision that earlier distributions are made at separation from service (in Duration)	3 years
Deferred compensation expense	543,000	373,000	312,000
Deferred Compensation Plan, First 1% Of Eligible Compensation
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Deferred compensation arrangement with Individual, cash awards granted, percentage	100.00%
Deferred Compensation Plan, 2% To 6% Of Eligible Compensation
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Deferred compensation arrangement with Individual, cash awards granted, percentage	70.00%
401(k) Plan
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Vesting period of employer contributions (in Duration)	2 years
Deferred compensation arrangement with individual, employer contribution	4,500,000	4,100,000	3,600,000
401(k) Plan, First 1% Of Eligible Compensation
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Deferred compensation arrangement with Individual, cash awards granted, percentage	100.00%
401(k) Plan, 2% To 6% Of Eligible Compensation
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Deferred compensation arrangement with Individual, cash awards granted, percentage	70.00%
Unvested Share Awards, Employment Inducing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock granted under plan (in Shares)	22,913
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	550,000	798,000	507,000
Shares granted, vesting period (Duration)	3 years
Stock granted under plan (in Shares)	50,099	66,822
Aggregate fair value of share awards granted				1,500,000	2,000,000
Performance period, ending each year on June 30 (in Duration)	12 months
Maximum aggregate value of shares that may be granted for the next annual performance period	1,500,000
Liability recorded for share awards	255,000
Employee Stock Option Exchanged For PIUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option awards outstanding (in Shares)	3,023,314
2010 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized	7,500,000
Number of shares available for grant	589,644
2010 Plan | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate fair value of share awards granted			6,200,000
Discount for lack of marketability of share awards, amount			$800,000
Cash dividends declared per common share (in Dollars per Share)			$1
2010 Plan | Unvested Share Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted, vesting period (Duration)	3 years
2010 Plan | Minimum | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Discount for lack of marketability of share awards, valuation percentage applied (in Percent)			7.10%
2010 Plan | Maximum | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Discount for lack of marketability of share awards, valuation percentage applied (in Percent)			11.55%
2014 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized	4,000,000
Number of shares available for grant	4,000,000
Herald Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized	0

Equity_Based_Compensation_Sche

Equity Based Compensation (Schedule of Compensation Costs Related to Equity Based Awards) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation cost of equity based awards	$15,633	$13,778	$23,802
Related tax benefits	-5,677	-5,021	-4,887
Compensation cost of equity based awards, net of tax	9,956	8,757	18,915
Unvested and restricted share awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation cost of equity based awards	14,474	11,618	7,389
Option awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation cost of equity based awards	609	1,362	2,671
Performance share awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation cost of equity based awards	550	798	507
Instruments issued in exchange for Profits Interest Units (PIUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation cost of equity based awards	$0	$0	$13,235

Equity_Based_Compensation_Sche1

Equity Based Compensation (Schedule of Unrecognized Compensation Costs) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014
Unvested and restricted share awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Cost	$17,359
Weighted Average Remaining Period (in Duration)	1 year 10 months 28 days
Performance share awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Cost	$1,265
Weighted Average Remaining Period (in Duration)	2 years 6 months

Equity_Based_Compensation_Sche2

Equity Based Compensation (Schedule of Nonvested Share Activity) (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
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)	$30.34	$24.53	$23.08
Range of the closing price on date of grant, maximum (in Dollars per Share)	$34.04	$30.72	$25.20
Aggregate grant date fair value of shares vesting	$11,273	$10,714	$31,346
Unvested Share Awards
Number of Share Awards
Unvested share awards outstanding, beginning balance (in Shares)	706,436	1,189,896	1,663,822
Granted (in Shares)	699,529	109,585	885,143
Vested (in Shares)	-465,476	-534,363	-1,268,440
Canceled or forfeited (in Shares)	-111,264	-58,682	-90,629
Unvested share awards outstanding, ending balance (in Shares)	829,225	706,436	1,189,896
Weighted Average Grant Date Fair Value
Unvested share awards outstanding (in Dollars per Share)	$24.02	$23.61	$25.97
Granted (in Dollars per Share)	$31.71	$28.77	$23.06
Vested (in Dollars per Share)	$24.22	$24.12	$26.28
Canceled or forfeited (in Dollars per Share)	$26.51	$23.61	$24.18
Unvested share awards outstanding (in Dollars per Share)	$30.06	$24.02	$23.61

Equity_Based_Compensation_Sche3

Equity Based Compensation (Schedule of Stock Options Activity) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Number of Option Awards
Option awards outstanding (in Shares)	5,070,939	5,698,788	5,738,122
Replacement options issued in conjunction with the acquisition of Herald (in Shares)			256,028
Exercised (in Shares)	-55,423	-539,588	-251,120
Canceled or forfeited (in Shares)	-469	-88,261	-44,242
Option awards outstanding (in Shares)	5,015,047	5,070,939	5,698,788
Exercisable (in Shares)	5,015,047
Weighted Average Exercise Price
Option awards outstanding (in Dollars per Share)	$26.38	$25.89	$25.20
Replacement options issued in conjunction with the acquisition of Herald (in Dollars per Share)			$31.32
Exercised (in Dollars per Share)	$16.71	$18.37	$14.32
Canceled or forfeited (in Dollars per Share)	$63.74	$43.30	$34.31
Option awards outstanding (in Dollars per Share)	$26.49	$26.38	$25.89
Exercisable (in Dollars per Share)	$26.49

Equity_Based_Compensation_Sche4

Equity Based Compensation (Schedule of Share Based Payment Award, Stock Options Valuation Assumptions) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012
Options Granted
Expected volatility (in Percent)	35.97%
Expected dividend yield (in Percent)	2.95%
Expected term in years (in Duration)	1 year 8 months 12 days
Risk-free interest rate (in Percent)	0.27%
Weighted average grant date fair value (in Dollars per Share)	$4.70

Equity_Based_Compensation_Sche5

Equity Based Compensation (Schedule of Options Outstanding and Exercisable, Additional Information) (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, number of options outstanding	5,015,047
Weighted average remaining contractual term in years, options outstanding	6 years 1 month 2 days
Aggregate intrinsic value, options outstanding	$13,060,087
Exercise Price Range 10.00-13.39
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower limit (in Dollars per Share)	$10
Exercise price range, upper limit (in Dollars per Share)	$13.39
Exercise price range, number of options outstanding	54,660
Weighted average remaining contractual term in years, options outstanding	4 years 8 months 23 days
Aggregate intrinsic value, options outstanding	974,588
Exercise Price Range 15.94-19.97
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower limit (in Dollars per Share)	$15.94
Exercise price range, upper limit (in Dollars per Share)	$19.97
Exercise price range, number of options outstanding	96,618
Weighted average remaining contractual term in years, options outstanding	5 years 4 months 21 days
Aggregate intrinsic value, options outstanding	1,070,988
Exercise Price Range 21.36-22.31
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower limit (in Dollars per Share)	$21.36
Exercise price range, upper limit (in Dollars per Share)	$22.31
Exercise price range, number of options outstanding	311,583
Weighted average remaining contractual term in years, options outstanding	6 years 8 months 9 days
Aggregate intrinsic value, options outstanding	2,080,620
Exercise Price 27.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower limit (in Dollars per Share)	$27
Exercise price range, upper limit (in Dollars per Share)	$27
Exercise price range, number of options outstanding	4,534,970
Weighted average remaining contractual term in years, options outstanding	6 years 1 month 2 days
Aggregate intrinsic value, options outstanding	8,933,891
Exercise Price 63.74
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower limit (in Dollars per Share)	$63.74
Exercise price range, upper limit (in Dollars per Share)	$63.74
Exercise price range, number of options outstanding	17,216
Weighted average remaining contractual term in years, options outstanding	3 years 11 months 9 days
Aggregate intrinsic value, options outstanding	$0

Regulatory_Requirements_and_Re2

Regulatory Requirements and Restrictions (Schedule of Compliance with Regulatory Capital Requirements Under Banking Regulations) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
BankUnited, Inc.
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 leverage capital, Actual, Amount	$1,937,480	$1,801,848
Tier 1 risk-based capital, Actual, Amount	1,937,480	1,801,848
Total risk-based capital, Actual, Amount	2,039,523	1,876,640
Tier 1 leverage capital, Actual, Ratio (in Percent)	10.70%	12.42%
Tier 1 risk-based capital, Actual, Ratio (in Percent)	15.45%	21.06%
Total risk-based capital, Actual, Ratio (in Percent)	16.27%	21.93%
Tier 1 risk-based capital, Required to be Considered Well Capitalized, Amount	752,257	513,439
Total risk-based capital, Required to be Considered Well Capitalized, Amount	1,253,761	855,732
Tier 1 risk-based capital, Required to be Considered Well Capitalized, Ratio (in Percent)	6.00%	6.00%
Total risk-based capital, Required to be Considered Well Capitalized, Ratio (in Percent)	10.00%	10.00%
Tier 1 leverage capital, Required to be Considered Adequately Capitalized, Amount	725,784	580,454
Tier 1 risk-based capital, Required to be Considered Adequately Capitalized, Amount	501,505	342,293
Total risk-based capital, Required to be Considered Adequately Capitalized, Amount	1,003,009	684,586
Tier 1 leverage capital, Required to be Considered Adequately Capitalized, Ratio (in Percent)	4.00%	4.00%
Tier 1 risk-based capital, Required to be Considered Adequately Capitalized, Ratio (in Percent)	4.00%	4.00%
Total risk-based capital, Required to be Considered Adequately Capitalized, Ratio (in Percent)	8.00%	8.00%
BankUnited
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 leverage capital, Actual, Amount	1,636,481	1,519,285
Tier 1 risk-based capital, Actual, Amount	1,636,481	1,519,285
Total risk-based capital, Actual, Amount	1,736,076	1,592,564
Tier 1 leverage capital, Actual, Ratio (in Percent)	9.10%	10.58%
Tier 1 risk-based capital, Actual, Ratio (in Percent)	13.18%	18.06%
Total risk-based capital, Actual, Ratio (in Percent)	13.99%	18.93%
Tier 1 leverage capital, Required to be Considered Well Capitalized, Amount	898,708	718,098
Tier 1 risk-based capital, Required to be Considered Well Capitalized, Amount	744,754	504,822
Total risk-based capital, Required to be Considered Well Capitalized, Amount	1,241,256	841,371
Tier 1 leverage capital, Required to be Considered Well Capitalized, Ratio (in Percent)	5.00%	5.00%
Tier 1 risk-based capital, Required to be Considered Well Capitalized, Ratio (in Percent)	6.00%	6.00%
Total risk-based capital, Required to be Considered Well Capitalized, Ratio (in Percent)	10.00%	10.00%
Tier 1 leverage capital, Required to be Considered Adequately Capitalized, Amount	718,967	574,479
Tier 1 risk-based capital, Required to be Considered Adequately Capitalized, Amount	496,502	336,548
Total risk-based capital, Required to be Considered Adequately Capitalized, Amount	$993,005	$673,097
Tier 1 leverage capital, Required to be Considered Adequately Capitalized, Ratio (in Percent)	4.00%	4.00%
Tier 1 risk-based capital, Required to be Considered Adequately Capitalized, Ratio (in Percent)	4.00%	4.00%
Total risk-based capital, Required to be Considered Adequately Capitalized, Ratio (in Percent)	8.00%	8.00%

Regulatory_Requirements_and_Re3

Regulatory Requirements and Restrictions (Narrative) (Details) (USD $)	Dec. 31, 2014
In Millions, unless otherwise specified
Regulatory Requirements and Restrictions [Abstract]
Ratio that the FDIC indemnification asset and the covered assets are risk-weighted at (in Percent)	20.00%
FRB net reserve requirement	$26

Fair_Value_Measurements_Assets

Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	$4,615,508	$3,658,990
Total liabilities at fair value	69,178	43,791
Derivative liabilities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total liabilities at fair value	69,178	43,791
US Treasury Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	54,967
U.S. Government agency and sponsored enterprise residential mortgage-backed securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	1,524,716	1,574,303
U.S. Government agency and sponsored enterprise commercial mortgage-backed securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	101,858	26,777
Re-Remics
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	183,272	271,785
Private label residential mortgage-backed securities and CMOs
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	403,979	310,118
Private label commercial mortgage-backed securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	1,139,389	808,772
Single family rental real estate-backed securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	443,017
Collateralized loan obligations
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	174,332
Non-mortgage asset-backed securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	122,164	178,994
Mutual funds and preferred stocks
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	105,442	149,677
State and municipal obligations
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	15,702
Small Business Administration securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	308,728	308,937
Other debt securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	8,128	7,761
Derivative assets
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	29,814	21,866
Fair Value, Inputs, Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	159,721	149,427
Fair Value, Inputs, Level 1 | US Treasury Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	54,967
Fair Value, Inputs, Level 1 | Mutual funds and preferred stocks
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	104,754	149,427
Fair Value, Inputs, Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	4,282,743	3,305,519
Total liabilities at fair value	69,177	43,788
Fair Value, Inputs, Level 2 | Derivative liabilities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total liabilities at fair value	69,177	43,788
Fair Value, Inputs, Level 2 | U.S. Government agency and sponsored enterprise residential mortgage-backed securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	1,524,716	1,574,303
Fair Value, Inputs, Level 2 | U.S. Government agency and sponsored enterprise commercial mortgage-backed securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	101,858	26,777
Fair Value, Inputs, Level 2 | Re-Remics
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	183,272	271,785
Fair Value, Inputs, Level 2 | Private label residential mortgage-backed securities and CMOs
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	235,902	110,710
Fair Value, Inputs, Level 2 | Private label commercial mortgage-backed securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	1,139,389	808,772
Fair Value, Inputs, Level 2 | Single family rental real estate-backed securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	443,017
Fair Value, Inputs, Level 2 | Collateralized loan obligations
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	174,332
Fair Value, Inputs, Level 2 | Non-mortgage asset-backed securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	122,164	178,994
Fair Value, Inputs, Level 2 | Mutual funds and preferred stocks
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	688	250
Fair Value, Inputs, Level 2 | State and municipal obligations
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	15,702
Fair Value, Inputs, Level 2 | Small Business Administration securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	308,728	308,937
Fair Value, Inputs, Level 2 | Other debt securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	3,210	3,160
Fair Value, Inputs, Level 2 | Derivative assets
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	29,765	21,831
Fair Value, Inputs, Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	173,044	204,044
Total liabilities at fair value	1	3
Fair Value, Inputs, Level 3 | Derivative liabilities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total liabilities at fair value	1	3
Fair Value, Inputs, Level 3 | Private label residential mortgage-backed securities and CMOs
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	168,077	199,408
Fair Value, Inputs, Level 3 | Other debt securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	4,918	4,601
Fair Value, Inputs, Level 3 | Derivative assets
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	$49	$35

Fair_Value_Measurements_Narrat

Fair Value Measurements (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Fair Value Inputs Assets Quantitative Information [Line Items]
Asset transfers	$0	$0
Assets, fair value	4,615,508,000	3,658,990,000
Other debt securities
Fair Value Inputs Assets Quantitative Information [Line Items]
Assets, fair value	8,128,000	7,761,000
Private label residential mortgage-backed securities and CMOs
Fair Value Inputs Assets Quantitative Information [Line Items]
Assets, fair value	403,979,000	310,118,000
Private label residential mortgage-backed securities and CMO's - Investment grade | Weighted Average
Fair Value Inputs Assets Quantitative Information [Line Items]
Current subordination level	15.70%
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	10.60%
Private label residential mortgage-backed securities and CMO's - Option-arm | Weighted Average
Fair Value Inputs Assets Quantitative Information [Line Items]
Current subordination level	3.60%
Fair Value, Inputs, Level 3
Fair Value Inputs Assets Quantitative Information [Line Items]
Assets, fair value	173,044,000	204,044,000
Fair Value, Inputs, Level 3 | Other debt securities
Fair Value Inputs Assets Quantitative Information [Line Items]
Assets, fair value	4,918,000	4,601,000
Fair Value, Inputs, Level 3 | Private label residential mortgage-backed securities and CMOs
Fair Value Inputs Assets Quantitative Information [Line Items]
Assets, fair value	168,077,000	199,408,000
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	89,468,000
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	44,812,000
Fair Value, Inputs, Level 3 | Private label residential mortgage-backed securities and CMO's - Option-arm
Fair Value Inputs Assets Quantitative Information [Line Items]
Assets, fair value	33,797,000
Fair value of Level 3 securities with zero subordination	$27,000,000

Fair_Value_Measurements_Change

Fair Value Measurements (Changes in the Fair Value of Assets and Liabilities Measured at Fair Value) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivative Liabilities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period, fair value of liabilities	($3)	($29)
Gains (losses) for the period included in Net income	-2	-26	-29
Balance at end of period, fair value of liabilities	-1	-3	-29
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	199,408
Gains (losses) for the period included in Other comprehensive income (loss)	-4,890
Premium and discount (amortization) accretion	8,010
Sales	-7,787
Settlements	-26,664
Balance at end of period, fair value of assets	168,077
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	4,601	4,173	3,159
Gains (losses) for the period included in Other comprehensive income (loss)	235	691	1,234
Premium and discount (amortization) accretion	173	61	63
Settlements	-91	-324	-283
Balance at end of period, fair value of assets	4,918	4,601	4,173
Derivative Assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period, fair value of assets	35
Gains (losses) for the period included in Net income	14	35
Balance at end of period, fair value of assets	49	35
Private Label Residential Mortgage-Backed Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period, fair value of assets		243,058	387,687
Gains (losses) for the period included in Other comprehensive income (loss)		-2,157	16,629
Premium and discount (amortization) accretion		12,470	12,713
Purchases or issuances			167,300
Settlements		-53,963	-136,244
Balance at end of period, fair value of assets		199,408	243,058
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Transfers out of level 3			-205,027
Non-mortgage asset-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period, fair value of assets			79,870
Gains (losses) for the period included in Other comprehensive income (loss)			1,482
Premium and discount (amortization) accretion			443
Settlements			-15,499
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Transfers out of level 3			($66,296)

Fair_Value_Measurements_Valuat

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 $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value Inputs Assets Quantitative Information [Line Items]
Total fair value of assets	4,615,508	$3,658,990
Private label residential mortgage-backed securities and CMO's - Investment grade | Discounted cash flow | Minimum
Fair Value Inputs Assets Quantitative Information [Line Items]
Voluntary prepayment rate	0.06%
Probability rate of default	0.02%
Loss severity	0.00%
Private label residential mortgage-backed securities and CMO's - Investment grade | Discounted cash flow | Maximum
Fair Value Inputs Assets Quantitative Information [Line Items]
Voluntary prepayment rate	10.96%
Probability rate of default	10.62%
Loss severity	42.40%
Private label residential mortgage-backed securities and CMO's - Investment grade | Discounted cash flow | Weighted Average
Fair Value Inputs Assets Quantitative Information [Line Items]
Voluntary prepayment rate	6.86%
Probability rate of default	4.00%
Loss severity	2.93%
Private label residential mortgage-backed securities and CMO's - Non-investment grade | Discounted cash flow | Minimum
Fair Value Inputs Assets Quantitative Information [Line Items]
Voluntary prepayment rate	0.33%
Probability rate of default	0.02%
Loss severity	0.00%
Private label residential mortgage-backed securities and CMO's - Non-investment grade | Discounted cash flow | Maximum
Fair Value Inputs Assets Quantitative Information [Line Items]
Voluntary prepayment rate	11.57%
Probability rate of default	22.99%
Loss severity	31.08%
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]
Voluntary prepayment rate	5.77%
Probability rate of default	5.26%
Loss severity	2.50%
Private label residential mortgage-backed securities and CMO's - Option-arm | Discounted cash flow | Minimum
Fair Value Inputs Assets Quantitative Information [Line Items]
Voluntary prepayment rate	3.69%
Probability rate of default	2.76%
Loss severity	16.84%
Private label residential mortgage-backed securities and CMO's - Option-arm | Discounted cash flow | Maximum
Fair Value Inputs Assets Quantitative Information [Line Items]
Voluntary prepayment rate	3.72%
Probability rate of default	2.97%
Loss severity	32.37%
Private label residential mortgage-backed securities and CMO's - Option-arm | Discounted cash flow | Weighted Average
Fair Value Inputs Assets Quantitative Information [Line Items]
Voluntary prepayment rate	3.71%
Probability rate of default	2.81%
Loss severity	20.75%
Fair Value, Inputs, Level 3
Fair Value Inputs Assets Quantitative Information [Line Items]
Total fair value of assets	173,044	204,044
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	89,468
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	44,812
Fair Value, Inputs, Level 3 | Private label residential mortgage-backed securities and CMO's - Option-arm
Fair Value Inputs Assets Quantitative Information [Line Items]
Total fair value of assets	33,797

Fair_Value_Measurements_Assets1

Fair Value Measurements (Assets for which Nonrecurring Changes in Fair Value have been Recorded) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
OREO
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Nonrecurring Changes in Fair Value	$10,606	$40,570	$76,022
Gains (Losses) from Fair Value Changes	-2,791	-1,939	-9,926
OREO | Fair Value, Inputs, Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Nonrecurring Changes in Fair Value	10,606	40,570	76,022
Impaired Loans
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Nonrecurring Changes in Fair Value	11,727	7,320	5,956
Gains (Losses) from Fair Value Changes	2,539	-22,865	-1,600
Impaired Loans | Fair Value, Inputs, Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Nonrecurring Changes in Fair Value	$11,727	$7,320	$5,956

Fair_Value_Measurements_Carryi

Fair Value Measurements (Carrying Value and Fair Value of Financial Instruments) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Assets:
Investment securities available for sale	$4,585,694	$3,637,124
Non-marketable equity securities	191,674	152,066
Derivative assets	0	1,291
Liabilities:
Derivative liabilities	0	0
Fair Value, Inputs, Levels 1, 2, And 3
Assets:
Investment securities available for sale	4,585,694	3,637,124
Fair Value, Inputs, Level 1
Assets:
Cash and cash equivalents	187,517	252,749
Investment securities held to maturity	10,000	0
Fair Value, Inputs, Levels 2 And 3
Assets:
Derivative assets	29,814	21,866
Liabilities:
Derivative liabilities	69,178	43,791
Fair Value, Inputs, Level 2
Assets:
Non-marketable equity securities	191,674	152,066
Loans held for sale	1,445	197
Accrued interest receivable	32,636	25,150
Liabilities:
Demand, savings and money market deposits	9,509,830	7,250,401
Time deposits	4,017,476	3,303,358
FHLB advances and other borrowings	3,320,338	2,417,566
Accrued interest payable	1,997	1,643
Fair Value, Inputs, Level 3
Assets:
Covered loans	1,763,132	2,199,683
Non-covered loans	11,443,408	7,424,698
FDIC indemnification asset	595,847	854,703
Carrying Value
Assets:
Cash and cash equivalents	187,517	252,749
Investment securities available for sale	4,585,694	3,637,124
Investment securities held to maturity	10,000	0
Non-marketable equity securities	191,674	152,066
Loans held for sale	1,399	194
Covered loans	1,039,672	1,471,493
Non-covered loans	11,279,555	7,512,391
FDIC indemnification asset	974,704	1,205,117
Accrued interest receivable	32,636	25,150
Derivative assets	29,814	21,866
Liabilities:
Demand, savings and money market deposits	9,509,830	7,250,401
Time deposits	4,001,925	3,282,027
FHLB advances and other borrowings	3,318,559	2,414,313
Accrued interest payable	1,997	1,643
Derivative liabilities	$69,178	$43,791

Commitments_and_Contingencies_1

Commitments and Contingencies (Total Lending Related Commitments Outstanding) (Details) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Lending Related Commitments [Line Items]
Total lending related commitments outstanding	$1,946,713
Commitments to fund loans
Lending Related Commitments [Line Items]
Total lending related commitments outstanding	493,222
Commitments to fund loans - Non-Covered
Lending Related Commitments [Line Items]
Total lending related commitments outstanding	493,222
Commitments to purchase loans
Lending Related Commitments [Line Items]
Total lending related commitments outstanding	117,193
Commitments to purchase loans - Non-Covered
Lending Related Commitments [Line Items]
Total lending related commitments outstanding	117,193
Unfunded commitments under lines of credit
Lending Related Commitments [Line Items]
Total lending related commitments outstanding	1,278,628
Unfunded commitments under lines credit - Covered
Lending Related Commitments [Line Items]
Total lending related commitments outstanding	25,765
Unfunded commitments under lines of credit - Non-Covered
Lending Related Commitments [Line Items]
Total lending related commitments outstanding	1,252,863
Commercial and standby letters of credit
Lending Related Commitments [Line Items]
Total lending related commitments outstanding	57,670
Commercial and standby letters of credit - Non-Covered
Lending Related Commitments [Line Items]
Total lending related commitments outstanding	57,670
Covered
Lending Related Commitments [Line Items]
Total lending related commitments outstanding	25,765
Non-covered
Lending Related Commitments [Line Items]
Total lending related commitments outstanding	$1,920,948

Condensed_Financial_Statements2

Condensed Financial Statements of BankUnited, Inc. (Schedule of Condensed Balance Sheet) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Assets:
Cash and cash equivalents	$187,517	$252,749	$495,353	$303,742
Investment securities available for sale, at fair value	4,585,694	3,637,124
Deferred tax asset, net	117,215	70,626
Other assets	211,282	232,010
Total assets	19,210,529	15,046,649
Liabilities and Stockholders' Equity:
Liabilities	17,157,995	13,117,951
Stockholders' equity	2,052,534	1,928,698	1,806,680	1,535,280
Total liabilities and stockholders' equity	19,210,529	15,046,649
BankUnited, Inc.
Assets:
Cash and cash equivalents	178,444	132,293	52,989	128,126
Investment securities available for sale, at fair value	126,888	132,262
Investment in subsidiaries	1,747,992	1,643,939
Deferred tax asset, net	14,534	15,043
Other assets	8,593	31,254
Total assets	2,076,451	1,954,791
Liabilities and Stockholders' Equity:
Liabilities	23,917	26,093
Stockholders' equity	2,052,534	1,928,698
Total liabilities and stockholders' equity	$2,076,451	$1,954,791

Condensed_Financial_Statements3

Condensed Financial Statements of BankUnited, Inc. (Schedule of Condensed Statements of Income) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income:
Interest and dividends on investment securities available for sale									$108,662	$114,535	$131,198
Expense:
Employee compensation and benefits									195,218	173,763	173,261
Income before income taxes	61,536	73,380	72,544	85,790	73,389	78,557	86,902	79,154	293,250	318,002	344,865
Provision (benefit) for income taxes	-14,702	-19,813	-24,001	-30,519	-20,996	-24,248	-32,894	-30,928	-89,035	-109,066	-133,605
Net income	46,834	53,567	48,543	55,271	52,393	54,309	54,008	48,226	204,215	208,936	211,260
BankUnited, Inc.
Income:
Interest and dividends on investment securities available for sale									5,560	5,647	3,890
Service fees from subsidiaries									15,746	6,293	14,043
Equity in earnings of subsidiaries									208,934	216,240	218,154
Other									0	68	5,905
Total									230,240	228,248	241,992
Expense:
Employee compensation and benefits									21,388	18,465	26,928
Other									4,571	6,806	6,914
Total									25,959	25,271	33,842
Income before income taxes									204,281	202,977	208,150
Provision (benefit) for income taxes									-66	5,959	3,110
Net income									$204,215	$208,936	$211,260

Condensed_Financial_Statements4

Condensed Financial Statements of BankUnited, Inc. (Schedule of Condensed Statements of Cash Flows) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net income	$204,215	$208,936	$211,260
Adjustments to reconcile net income to net cash provided by operating activities:
Equity based compensation	15,551	13,936	23,204
Net cash used in operating activities	-49,746	-67,107	-351,606
Cash flows from investing activities:
Purchase of investment securities available for sale	-1,549,649	-1,095,477	-1,300,485
Other	-8,035	-52,869	-1,086
Net cash provided by (used in) investing activities	-3,807,807	-2,606,984	201,000
Cash flows from financing activities:
Dividends paid	-87,716	-65,225	-89,021
Other	4,581	2,490	-1,665
Net cash provided by financing activities	3,792,321	2,431,487	342,217
Net increase (decrease) in cash and cash equivalents	-65,232	-242,604	191,611
Cash and cash equivalents, beginning of period	252,749	495,353	303,742
Cash and cash equivalents, end of period	187,517	252,749	495,353
Supplemental schedule of non-cash investing and financing activities:
Dividends declared, not paid	21,968	21,833
Equity consideration issued in business combination	0	0	39,861
BankUnited, Inc.
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net income	204,215	208,936	211,260
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed earnings of subsidiaries	-116,934	-116,240	-118,154
Equity based compensation	15,551	13,936	23,204
Other	20,804	5,267	-5,529
Net cash used in operating activities	123,636	111,899	110,781
Cash flows from investing activities:
Capital contributions to subsidiary	0	0	-30,000
Purchase of investment securities available for sale	0	0	-99,710
Proceeds from repayments, sale, maturities and calls of investment securities available for sale	7,319	19,851	53,094
Net cash paid in business combination	0	0	-25,164
Other	-137	79	-326
Net cash provided by (used in) investing activities	7,182	19,930	-102,106
Cash flows from financing activities:
Dividends paid	-87,716	-65,225	-89,021
Other	3,049	12,700	5,209
Net cash provided by financing activities	-84,667	-52,525	-83,812
Net increase (decrease) in cash and cash equivalents	46,151	79,304	-75,137
Cash and cash equivalents, beginning of period	132,293	52,989	128,126
Cash and cash equivalents, end of period	178,444	132,293	52,989
Supplemental schedule of non-cash investing and financing activities:
Dividends declared, not paid	21,968	21,833	0
Equity consideration issued in business combination	$0	$0	$39,861

Condensed_Financial_Statements5

Condensed Financial Statements of BankUnited, Inc. (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Investment in the Bank	$1,700,000,000	$1,600,000,000
Cash dividends received from the Bank	$92,000,000	$100,000,000	$100,000,000

Quarterly_Financial_Informatio2

Quarterly Financial Information (Unaudited) (Schedule of Quarterly Financial Information) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Interest income	$200,227	$201,222	$191,733	$190,562	$188,664	$187,684	$186,098	$176,375	$783,744	$738,821	$720,856
Interest expense	28,725	27,973	25,855	24,098	24,409	23,566	22,048	22,588	106,651	92,611	123,269
Net interest income before provision for loan losses	171,502	173,249	165,878	166,464	164,255	164,118	164,050	153,787	677,093	646,210	597,587
Provision for loan losses	20,523	5,387	7,192	8,403	12,512	2,604	4,881	11,967	41,505	31,964	18,896
Net interest income after provision for loan losses	150,979	167,862	158,686	158,061	151,743	161,514	159,169	141,820	635,588	614,246	578,691
Non-interest income	19,046	14,451	20,478	30,190	21,009	13,687	13,230	20,123	84,165	68,049	73,941
Non-interest expense	108,489	108,933	106,620	102,461	99,363	96,644	85,497	82,789	426,503	364,293	307,767
Income before income taxes	61,536	73,380	72,544	85,790	73,389	78,557	86,902	79,154	293,250	318,002	344,865
Provision for income taxes	14,702	19,813	24,001	30,519	20,996	24,248	32,894	30,928	89,035	109,066	133,605
Net income	$46,834	$53,567	$48,543	$55,271	$52,393	$54,309	$54,008	$48,226	$204,215	$208,936	$211,260
Earnings per common share, basic (in Dollars per Share)	$0.45	$0.51	$0.46	$0.53	$0.50	$0.52	$0.52	$0.48	$1.95	$2.03	$2.05
Earnings per common share, diluted (in Dollars per Share)	$0.45	$0.51	$0.46	$0.53	$0.50	$0.52	$0.52	$0.47	$1.95	$2.01	$2.05