Northfield Bancorp, Inc. (NFBK) 10-K 16 Mar 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
	Dec. 31, 2014	Feb. 28, 2015	Jun. 30, 2014
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	FALSE
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Entity Registrant Name	Northfield Bancorp, Inc.
Entity Central Index Key	1493225
Current Fiscal Year End Date	-19
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		47,654,629
Entity Current Reporting Status	Yes
Entity Public Float			$670,807,093
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
ASSETS:
Cash and due from banks	$14,967	$15,348
Interest-bearing deposits in other financial institutions	61,742	45,891
Total cash and cash equivalents	76,709	61,239
Trading securities	6,422	5,998
Securities available-for-sale, at estimated fair value (encumbered $216,262 at December 31, 2014 and $197,896 at December 31, 2013)	771,239	937,085
Securities held-to-maturity, (estimated fair value of $3,691 at December 31, 2014) (encumbered $2,114 at December 31, 2014)	3,609	0
Loans held-for-sale	0	471
Purchased credit-impaired (PCI) loans held-for-investment	44,816	59,468
Loans acquired	265,685	77,817
Originated loans held-for-investment, net	1,632,494	1,352,191
Loans held-for-investment, net	1,942,995	1,489,476
Allowance for loan losses	-26,292	-26,037
Net loans held-for-investment	1,916,703	1,463,439
Accrued interest receivable	8,015	8,137
Bank owned life insurance	129,015	125,113
Federal Home Loan Bank of New York stock, at cost	29,219	17,516
Premises and equipment, net	26,226	29,057
Goodwill	16,159	16,159
Other real estate owned	752	634
Other assets	36,801	37,916
Total assets	3,020,869	2,702,764
LIABILITIES:
Deposits	1,620,665	1,492,689
Securities sold under agreements to repurchase	203,200	181,000
Other borrowings	575,458	289,325
Advance payments by borrowers for taxes and insurance	7,792	6,441
Accrued expenses and other liabilities	19,826	17,201
Total liabilities	2,426,941	1,986,656
STOCKHOLDERS’ EQUITY:
Preferred stock, $0.01 par value; 10,000,000 shares authorized, none issued or outstanding	0	0
Common stock, $0.01 par value: 150,000,000 shares authorized, 58,226,326 shares issued at December 31, 2014 and 2013, respectively, 48,402,083 and 57,926,233 outstanding at December 31, 2014 and 2013, respectively	582	582
Additional paid-in-capital	499,606	508,609
Unallocated common stock held by employee stock ownership plan	-25,782	-26,985
Retained earnings	248,908	242,180
Accumulated other comprehensive loss	-765	-4,650
Treasury stock at cost; 9,824,243 and 300,093 shares at December 31, 2014 and 2013, respectively	-128,621	-3,628
Total stockholders’ equity	593,928	716,108
Total liabilities and stockholders’ equity	$3,020,869	$2,702,764

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]
Available for sale securities encumbered	$216,262	$197,896
Estimated fair value of securities held to maturity	3,691	0
Held to maturity securities encumbered	$2,114	$0
Preferred stock, par value	$0.01	$0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	58,226,326	58,226,326
Common stock, shares outstanding	48,402,083	57,926,233
Treasury stock, shares	9,824,243	300,093

Consolidated_Statements_Of_Com

Consolidated Statements Of Comprehensive (Loss) Income (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest income:
Loans	$73,407	$68,472	$61,514
Mortgage-backed securities	16,861	21,920	26,791
Other securities	604	1,459	2,588
Federal Home Loan Bank of New York dividends	772	536	591
Deposits in other financial institutions	57	83	55
Total interest income	91,701	92,470	91,539
Interest expense:
Deposits	5,391	6,501	9,837
Borrowings	9,961	10,447	12,807
Total interest expense	15,352	16,948	22,644
Net interest income	76,349	75,522	68,895
Provision for loan losses	645	1,927	3,536
Net interest income after provision for loan losses	75,704	73,595	65,359
Non-interest income:
Fees and service charges for customer services	4,073	3,182	3,005
Income on bank owned life insurance	3,902	3,607	2,883
Gain on securities transactions, net	227	3,217	2,534
Other-than-temporary impairment losses on securities	0	-434	-24
Other	258	589	188
Total non-interest income	8,460	10,161	8,586
Non-interest expense:
Compensation and employee benefits	26,195	27,142	24,096
Occupancy	9,616	9,709	8,192
Furniture and equipment	1,636	1,751	1,463
Data processing	3,680	4,301	3,739
Professional fees	2,458	2,885	3,279
FDIC insurance	1,306	1,432	1,628
Other	7,151	6,653	6,601
Total non-interest expense	52,042	53,873	48,998
Income before income tax expense	32,122	29,883	24,947
Income tax expense	11,856	10,736	8,916
Net income	20,266	19,147	16,031
Net income per common share:
Basic	$0.41	$0.35	$0.30
Diluted	$0.41	$0.34	$0.29
Weighted average shares outstanding - basic	49,006,129	54,637,680	54,339,467
Weighted average shares outstanding - diluted	50,032,259	55,560,309	55,115,680
Unrealized gains (losses) on securities:
Net unrealized holding gains (losses) on securities	8,535	-37,449	3,418
Less: reclassification adjustment for net gains included in net income (included in gains on securities transactions, net)	-382	-2,254	-2,150
Net unrealized gains (losses)	8,153	-39,703	1,268
Post retirement benefits adjustment	-1,689	1,134	85
Reclassification adjustment for OTTI impairment included in net income (included OTTI losses on securities)	0	434	24
Other comprehensive income (loss), before tax	6,464	-38,135	1,377
Income tax expense (benefit) related to net unrealized holding gains (losses) on securities	3,408	-14,980	1,432
Income tax expense related to reclassification adjustment for gains included in net income	-153	-902	-860
Income tax (benefit) expense related to post retirement benefits adjustment	-676	454	34
Income tax benefit related to reclassification adjustment for OTTI impairment included in net income	0	174	10
Other comprehensive income (loss), net of tax	3,885	-22,881	761
Comprehensive income (loss)	$24,151	($3,734)	$16,792

Consolidated_Statements_Of_Cha

Consolidated Statements Of Changes In Stockholders' Equity (USD $)	Total	Common Stock	Additional Paid-in Capital	Unallocated Common Stock Held by the Employee Stock Ownership Plan	Retained Earnings	Accumulated Other Comprehensive Income (loss) Net of tax	Treasury Stock
In Thousands, except Share data, unless otherwise specified
Beginning Balance at Dec. 31, 2011	$382,650	$456	$209,302	($14,570)	$235,776	$17,470	($65,784)
Beginning Balance, shares at Dec. 31, 2011		40,518,591
Comprehensive income:
Net income	16,031				16,031
Other comprehensive income, net of tax	761					761
ESOP shares allocated or committed to be released	878		273	605
Stock compensation expense	3,029		3,029
Additional tax benefit on equity awards	204		204
Common stock issued to complete merger	17,458	13	17,445
Common stock issued to complete merger, shares		1,271,675
Exercise of stock options	-72				-193		121
Cash dividends declared	-1,722				-1,722
Treasury Stock, Shares, Acquired		-303,447
Treasury stock	-4,344						-4,344
Ending Balance at Dec. 31, 2012	414,873	469	230,253	-13,965	249,892	18,231	-70,007
Ending Balance, shares at Dec. 31, 2012		41,486,819
Comprehensive income:
Net income	19,147				19,147
Other comprehensive income, net of tax	-22,881					-22,881
ESOP shares allocated or committed to be released	1,688		484	1,204
Stock compensation expense	3,349		3,349
Additional tax benefit on equity awards	296		296
Merger of Northfield Bancorp MHC	124	-246	370
Merger of Northfield Bancorp MHC, shares		-24,641,684
Exchanged of common stock	0	-169	169
Exchanged of common stock, shares		-16,845,135
Treasury stock retired	0	-54	-69,953				70,007
Proceeds of stock offering, net of costs	329,964	568	329,396
Proceeds of stock offering, net of costs, shares		56,777,462
Purchase of common stock by ESOP	14	14	14,224	-14,224
Purchase of common stock by ESOP, shares		1,422,357
Exercise of stock options	21		21
Exercise of stock options, shares	26,507	26,507
Cash dividends declared	-26,859				-26,859
Treasury Stock, Shares, Acquired		-300,093
Treasury stock	-3,628						-3,628
Ending Balance at Dec. 31, 2013	716,108	582	508,609	-26,985	242,180	-4,650	-3,628
Ending Balance, shares at Dec. 31, 2013		57,926,233
Comprehensive income:
Net income	20,266				20,266
Other comprehensive income, net of tax	3,885					3,885
ESOP shares allocated or committed to be released	1,848		645	1,203
Stock compensation expense	2,805		2,805
Additional tax benefit on equity awards	390		390
Issuance of restricted stock	0		-12,633				12,633
Issuance of restricted stock, shares		991,200
Exercise of stock options	212		-210		-654		1,076
Exercise of stock options, shares	146,833	146,833
Cash dividends declared	-12,884				-12,884
Treasury Stock, Shares, Acquired		-10,662,183
Treasury stock	-138,702						-138,702
Ending Balance at Dec. 31, 2014	$593,928	$582	$499,606	($25,782)	$248,908	($765)	($128,621)
Ending Balance, shares at Dec. 31, 2014		48,402,083

Consolidated_Statements_Of_Cha1

Consolidated Statements Of Changes In Stockholders' Equity (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Stockholders' Equity [Abstract]
Dividends declared per share	$0.26	$0.49	$0.09
Average cost of treasury stock per share	$13	$12.09	$13.81

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	$20,266	$19,147	$16,031
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	645	1,927	3,536
ESOP and stock compensation expense	4,653	5,037	3,907
Depreciation	3,640	3,634	2,824
Amortization of premiums, and deferred loan costs, net of (accretion) of discounts, and deferred loan fees	1,695	1,949	339
Amortization of mortgage servicing rights	0	0	57
Income on bank owned life insurance	-3,902	-3,607	-2,883
Gain on sale of premises and equipment and other real estate owned	0	-397	0
Net (gain) loss on sale of loans held-for-sale	-79	-60	106
Proceeds from sale of loans held-for-sale	1,707	12,726	17,107
Origination of loans held-for-sale	-1,157	-3,986	-13,314
Gain on securities transactions, net	-227	-3,217	-2,534
Net impairment losses on securities recognized in earnings	0	434	24
Net purchases of trading securities	-579	-358	-147
Decrease in accrued interest receivable	122	17	899
(Increase) decrease in other assets	-2,948	978	4,316
Decrease in prepaid FDIC assessment	0	0	1,415
Deferred taxes	-1,167	-4,033	-2,733
Increase (decrease) in accrued expenses and other liabilities	2,625	-623	-1,289
Amortization of core deposit intangible	416	440	316
Net cash provided by operating activities	25,710	30,008	27,977
Cash flows from investing activities:
Net increase in loans receivable	-267,912	-253,145	-96,339
Purchase of loans	-186,475	0	0
(Purchase) redemptions of Federal Home Loan Bank of New York stock, net	-11,703	-4,966	585
Purchases of securities available-for-sale	-436	-289,562	-801,492
Principal payments and maturities on securities available-for-sale	161,650	331,536	420,271
Principal payments and maturities on securities held-to-maturity	442	0	32,275
Purchases of securities held-to-maturity	-4,066	0	0
Proceeds from sale of securities available-for-sale	11,975	259,551	207,700
Purchase of bank owned life insurance	0	-28,464	-7,729
Proceeds from sale of premises and equipment and other real estate owned	418	519	3,240
Purchases and improvements of premises and equipment	-809	-2,916	-8,035
Net cash acquired in business combinations	0	0	4,721
Net cash (used in) provided by investing activities	-296,916	12,553	-244,803
Cash flows from financing activities:
Net increase (decrease) in deposits	127,976	-174,617	352,766
Dividends paid	-12,884	-26,859	-1,722
Net proceeds from sale of common stock	0	54,648	0
Merger of Northfield Bancorp, MHC	0	124	0
Purchase of common stock for ESOP	0	-14,224	0
Exercise of stock options	212	21	16
Purchase of treasury stock	-138,702	-3,628	-4,344
Additional tax benefit on equity awards	390	296	204
Increase in advance payments by borrowers for taxes and insurance	1,351	2,953	1,287
Repayments under capital lease obligations	-272	-289	-251
Proceeds from securities sold under agreements to repurchase and other borrowings	821,373	539,250	398,439
Repayments related to securities sold under agreements to repurchase and other borrowings	-512,768	-487,758	-466,077
Repayments related to securities sold under agreements to repurchase and other borrowings	286,676	-110,083	280,318
Net increase (decrease) in cash and cash equivalents	15,470	-67,522	63,492
Cash and cash equivalents at beginning of period	61,239	128,761	65,269
Cash and cash equivalents at end of period	76,709	61,239	128,761
Cash paid during the period for:
Interest	15,002	17,177	22,997
Income taxes	16,696	16,196	7,991
Non-cash transactions:
Transfers of held-to-maturity securities to available-for-sale securities	0	2,200	0
Loans charged-off, net	390	2,314	3,949
Transfers of loans to other real estate owned	860	0	306
Other real estate owned write-downs	305	124	512
Transfers of loans to held-for-sale, at fair value	0	3,704	5,446
Deposits utilized to purchase common stock	0	289,554	0
Non-cash assets acquired, at fair value:
Loans	0	0	81,876
Core deposit intangible	0	0	592
Other real estate owned	0	0	823
Accrued interest receivable	0	0	443
Federal Home Loan Bank of New York stock	0	0	458
Bank owned life insurance	0	0	4,652
Premises and equipment	0	0	4,586
Other assets	0	0	5,792
Total non-cash assets acquired	0	0	131,922
Non-cash liabilities assumed, at fair value:
Deposits	0	0	110,568
Borrowings	0	0	5,077
Other liabilities	0	0	3,540
Total non-cash liabilities assumed	0	0	119,185
Net non-cash assets acquired	0	0	12,737
Net cash and cash equivalents acquired	0	0	4,721
Common stock issued in acquisition	0	0	13
Held-to-maturity Securities
Non-cash assets acquired, at fair value:
Securities held-to-maturity	$0	$0	$32,700

Summary_Of_Significant_Account

Summary Of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Summary Of Significant Accounting Policies	Summary of Significant Accounting Policies
	The following significant accounting and reporting policies of Northfield Bancorp, Inc. and subsidiaries (collectively, the “Company”), conform to U.S. generally accepted accounting principles (“U.S. GAAP”), and are used in preparing and presenting these consolidated financial statements.
	(a)    Plan of Conversion and Reorganization
	On June 6, 2012, the Board of Trustees of Northfield Bancorp, MHC (MHC) and the Board of Directors of the Company adopted a Plan of Conversion and Reorganization (the Plan).  Pursuant to the Plan, the MHC converted from the mutual holding company form of organization to the fully public form on January 24, 2013.  The MHC was merged into the Company, and the MHC no longer exists.  The Company merged into a new Delaware corporation named Northfield Bancorp, Inc.  As part of the conversion, the MHC’s ownership interest of the Company was offered for sale in a public offering.  The existing publicly held shares of the Company, which represented the remaining ownership interest in the Company, were exchanged for new shares of common stock of Northfield Bancorp, Inc., the new Delaware Corporation.  The exchange ratio ensured that immediately after the conversion and public offering, the public shareholders of the Company owned the same aggregate percentage of Northfield Bancorp., Inc. common stock that they owned immediately prior to that time (excluding shares purchased in the stock offering and cash received in lieu of fractional shares).  When the conversion and public offering was completed, all of the capital stock of Northfield Bank was owned by Northfield Bancorp, Inc., the Delaware Corporation.
	The Plan provided for the establishment of special “liquidation accounts” for the benefit of certain depositors of Northfield Bank in an amount equal to the greater of the MHC’s ownership interest in the retained earnings of the Company as of the date of the latest balance sheet contained in the prospectus or the retained earnings of Northfield Bank at the time it reorganized into the MHC.  Following the completion of the conversion, under the rules of the Board of Governors of the Federal Reserve System, Northfield Bank is not permitted to pay dividends on its capital stock to Northfield Bancorp, Inc., its sole shareholder, if Northfield Bank’s shareholder’s equity would be reduced below the amount of the liquidation accounts.  The liquidation accounts will be reduced annually to the extent that eligible account holders have reduced their qualifying deposits.  Subsequent increases in qualifying deposits will not restore an eligible account holder’s interest in the liquidation accounts.
	Direct costs of the conversion and public offering were deferred and reduced the proceeds from the shares sold in the public offering.  Costs of $11.5 million were incurred related to the conversion.
	Share and per share amounts have been restated to reflect the completion of our second-step conversion on January 24, 2013, at a conversion ratio of 1.4029 unless noted otherwise.
	(b)    Basis of Presentation
	The consolidated financial statements are comprised of the accounts of Northfield Bancorp, Inc. and its wholly owned subsidiaries, Northfield Investment, Inc. and Northfield Bank (the Bank) and the Bank’s wholly-owned significant subsidiaries, NSB Services Corp. and NSB Realty Trust.  All significant intercompany accounts and transactions have been eliminated in consolidation.
	In preparing the consolidated financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the balance sheets and revenues and expenses during the reporting periods.  Actual results may differ significantly from those estimates and assumptions.  A material estimate that is particularly susceptible to significant change in the near term is the allowance for loan losses.  In connection with the determination of this allowance, management generally obtains independent appraisals for significant properties.  In addition, judgments related to the amount and timing of expected cash flows from PCI loans, goodwill, securities valuation and impairment, and deferred income taxes, involve a higher degree of complexity and subjectivity and require estimates and assumptions about highly uncertain matters.  Actual results may differ from the estimates and assumptions.
	Certain prior year balances have been reclassified to conform to the current year presentation.
	(c)    Business
	The Company, through its principal subsidiary, the Bank, provides a full range of banking services primarily to individuals and corporate customers in Richmond and Kings Counties in New York, and Union and Middlesex Counties in New Jersey.  The Company is subject to competition from other financial institutions and to the regulations of certain federal and state agencies, and undergoes periodic examinations by those regulatory authorities.
	(d)    Cash Equivalents
	Cash equivalents consist of cash on hand, due from banks, and interest-bearing deposits in other financial institutions with an original term of three months or less.
	(e)    Securities
	Securities are classified at the time of purchase, based on management’s intention, as securities held- to-maturity, securities available-for-sale, or trading account securities.  Securities held-to-maturity are those that management has the positive intent and ability to hold until maturity.  Securities held-to-maturity are carried at amortized cost, adjusted for amortization of premiums and accretion of discounts using the level‑yield method over the contractual term of the securities, adjusted for actual prepayments.  Securities available-for-sale represents all securities not classified as either held-to-maturity or trading.  Securities available-for-sale are carried at estimated fair value with unrealized holding gains and losses (net of related tax effects) on such securities excluded from earnings, but included as a separate component of stockholders’ equity, titled “Accumulated other comprehensive income  (loss).”  The cost of securities sold is determined using the specific‑identification method.  Security transactions are recorded on a trade-date basis. Trading securities are securities that are bought and may be held for the purpose of selling them in the near term.  Trading securities are reported at estimated fair value, with unrealized holding gains and losses reported as a component of gain (loss) on securities transactions, net in non-interest income.
	Our evaluation of other-than-temporary impairment considers the duration and severity of the impairment, our intent and ability to hold the securities, and our assessments of the reason for the decline in value and the likelihood of a near-term recovery.  If a determination is made that a debt security is other-than-temporarily impaired, the Company will estimate the amount of the unrealized loss that is attributable to credit and all other non-credit related factors.  If we intend to hold securities in an unrealized loss position until the loss is recovered, which may be at maturity,  the credit related component will be recognized as an other-than-temporary impairment charge in non-interest income.  The non-credit related component will be recorded as an adjustment to accumulated other comprehensive income (loss), net of tax.  The estimated fair value of debt securities, including mortgage-backed securities and corporate debt obligations is furnished by an independent third-party pricing service.  The third-party pricing service primarily utilizes pricing models and methodologies that incorporate observable market inputs, including among other things, benchmark yields, reported trades, and projected prepayment and default rates.  Management reviews the data and assumptions used in pricing the securities by its third-party provider for reasonableness.
	(f)    Loans
	During 2012 and 2011, the Company acquired loans with deteriorated credit quality, herein referred to as PCI loans, and transferred certain loans, previously originated and designated by the Company as held-for-investment, to held-for-sale.  The accounting and reporting for these loans differs substantially from those loans originated and classified by the Company as held-for-investment.  For purposes of reporting, discussion and analysis, management has classified its loan portfolio into four categories:  (1) loans originated by the Company and held-for-sale, which are carried at the lower of aggregate cost or estimated fair value, less costs to sell, and therefore have no associated allowance for loan losses, (2) PCI loans, which are held-for-investment, and initially valued at estimated fair value on the date of acquisition, with no initial related allowance for loan losses, and (3) originated loans held-for-investment, which are carried at amortized cost, less net charge-offs and the allowance for loan losses, and (4) acquired loans with no evidence of credit deterioration, which are held-for-investment, and initially valued at an estimated fair value on the date of acquisition, with no initial related allowance for loan losses.
	Originated and acquired net loans held-for-investment are stated at unpaid principal balance, adjusted by unamortized premiums and unearned discounts, deferred origination fees and certain direct origination costs, and the allowance for loan losses.  Interest income on loans is accrued and credited to income as earned.  Net loan origination fees/costs are deferred and accreted/amortized to interest income over the loan’s contractual life using the level-yield method, adjusted for actual prepayments.  Generally, loans held-for-sale are designated at time of origination and generally consist of  newly originated fixed rate residential loans and are recorded at the lower of aggregate cost or estimated fair value in the aggregate.  In 2013 and 2012, the Company transferred from held-for-investment to held-for-sale certain impaired loans. Transfers from held-for-investment are infrequent and occur at fair value less costs to sell, with any charge-off to allowance for loan losses. Gains are recognized on a settlement-date basis and are determined by the difference between the net sales proceeds and the carrying value of the loans, including any net deferred fees or costs.
	Originated and acquired net loans held-for-investment are deemed impaired when it is probable, based on current information, that the Company will not collect all amounts due in accordance with the contractual terms of the loan agreement.  The Company has defined the population of originated and acquired impaired loans to be all originated and acquired non-accrual loans held-for-investment with an outstanding balance of $500,000 or greater and all loans restructured in troubled debt restructurings (TDRs).  Originated and acquired impaired loans held-for-investment are individually assessed to determine that the loan’s carrying value is not in excess of the expected future cash flows, discounted at the loans original effective interest rate, or the underlying collateral (less estimated costs to sell) if the loan is collateral dependent.  Impairments, if any, are recognized through a charge to the provision for loan losses for the amount that the loan’s carrying value exceeds the discounted cash flow analysis or estimated fair value of collateral (less estimated costs to sell) if the loan is collateral dependent.  Such amounts are charged-off when considered appropriate.  Homogeneous loans with balances less than $500,000, which are not considered TDRs, are collectively evaluated for impairment.
	The allowance for loan losses is increased by the provision for loan losses charged against income and is decreased by charge-offs, net of recoveries.  Loan losses are charged-off in the period the loans, or portion thereof, are deemed uncollectible.  Generally, the Company will record a loan charge-off (including a partial charge-off) to reduce a loan to the estimated fair value of the underlying collateral, less cost to sell, if it is determined that it is probable that recovery will come primarily from the sale or operation of such collateral.  Specific reserves on impaired loans which are not considered collateral dependent are charged-off when such amounts are not considered to be collectible.  The provision for loan losses is based on management’s evaluation of the adequacy of the allowance which considers, among other things, impaired loans held-for-investment, deterioration in PCI loans subsequent to acquisition, past loan loss experience, known and inherent risks in the portfolio, and existing adverse situations that may affect borrowers’ ability to repay.  Additionally, management evaluates changes, if any, in underwriting standards, collection, charge-off and recovery practices, the nature or volume of the portfolio, lending staff, concentration of loans, as well as current economic conditions, and other relevant factors.  Management believes the allowance for loan losses is adequate to provide for probable and reasonably estimable losses at the date of the consolidated balance sheets.  The Company also maintains an allowance for estimated losses on off-balance sheet credit risks related to loan commitments and standby letters of credit.  Management utilizes a methodology similar to its allowance for loan loss adequacy methodology to estimate losses on these commitments.  The allowance for estimated credit losses on off-balance sheet commitments is included in other liabilities and any changes to the allowance are recorded as a component of other non-interest expense.
	While management uses available information to recognize probable and reasonably estimable losses on loans, future additions may be necessary based on changes in conditions, including changes in economic conditions, particularly in Richmond and Kings Counties in New York, and Union and Middlesex Counties in New Jersey and to a lesser extent Eastern Pennsylvania.  Accordingly, as with most financial institutions in the market area, the ultimate collectability of a substantial portion of the Company’s loan portfolio is susceptible to changes in conditions in the Company’s marketplace.  In addition, future changes in laws and regulations could make it more difficult for the Company to collect all contractual amounts due on its loans and mortgage-backed securities.
	In addition, various regulatory agencies, as an integral part of their examination process, periodically review the Company’s allowance for loan losses.  Such agencies may require the Company to recognize additions to the allowance based on their judgments about information available to them at the time of their examination.
	TDRs are those loans whose terms have been modified because of deterioration in the financial condition of the borrower.  Modifications could include extension of the repayment terms of the loan, reduced interest rates, and forgiveness of accrued interest and/or principal.  Once an obligation has been restructured because of such credit problems, it continues to be considered restructured until paid in full or, if the obligation yields a market rate (a rate equal to the rate the Company was willing to accept at the time of the restructuring for a new loan with comparable risk), until the year subsequent to the year in which the restructuring takes place, provided the borrower has performed under the modified terms for a six-month period.  The Company records an impairment charge equal to the difference between the present value of estimated future cash flows under the restructured terms discounted at the original loan’s effective interest rate, or the underlying collateral value less costs to sell, if the loan is collateral dependent.  Changes in present values attributable to the passage of time are recorded as a component of the provision for loan losses.
	A loan is considered past due when it is not paid in accordance with its contractual terms.  The accrual of income on loans, including impaired loans held-for-investment, and other loans in the process of foreclosure, is generally discontinued when a loan becomes 90 days or more delinquent, or sooner when certain factors indicate that the ultimate collection of principal and interest is in doubt.  Loans on which the accrual of income has been discontinued are designated as non-accrual loans.  All previously accrued interest is reversed against interest income, and income is recognized subsequently only in the period that cash is received, provided no principal payments are due and the remaining principal balance outstanding is deemed collectible.  A non-accrual loan is not returned to accrual status until both principal and interest payments are brought current and factors indicating doubtful collection no longer exist, including performance by the borrower under the loan terms for a six-month period.
	The Company accounts for the PCI loans based on expected cash flows. In accordance with current accounting guidance, the Company will maintain the integrity of a pool of multiple loans accounted for as a single asset and evaluate the pools for impairment, and accrual status, based on variances from the expected cash flows.
	(g)    Federal Home Loan Bank Stock
	The Bank, as a member of the Federal Home Loan Bank of New York (the FHLB), is required to hold shares of capital stock in the FHLB as a condition to both becoming a member and engaging in certain transactions with the FHLB.  The minimum investment requirement is determined by a “membership” investment component and an “activity-based” investment component.  The membership investment component is the greater of 0.20% of the Bank’s mortgage-related assets, as defined by the FHLB, or $1,000.  The activity-based investment component is equal to 4.5% of the Bank’s outstanding advances with the FHLB.  The activity-based investment component also considers other transactions, including assets originated for or sold to the FHLB, and delivery commitments issued by the FHLB.  The Company currently does not enter into these other types of transactions with the FHLB.
	On a quarterly basis, we perform our other-than-temporary impairment analysis of FHLB stock, we evaluate, among other things, (i) its earnings performance, including the significance of any decline in net assets of the FHLB as compared to the regulatory capital amount of the FHLB, (ii) the commitment by the FHLB to continue dividend payments, and (iii) the liquidity position of the FHLB.  We did not consider our investment in FHLB stock to be other-than-temporarily impaired at December 31, 2014, and 2013.
	(h)    Premises and Equipment, Net
	Premises and equipment, including leasehold improvements, are carried at cost, less accumulated depreciation and amortization.  Depreciation and amortization of premises and equipment, including capital leases, are computed on a straight‑line basis over the estimated useful lives of the related assets.  The estimated useful lives of significant classes of assets are generally as follows: buildings - forty years; furniture and equipment - five to seven years; and purchased computer software - three years.  Leasehold improvements are amortized over the shorter of the term of the related lease or the estimated useful lives of the improvements.  Major improvements are capitalized, while repairs and maintenance costs are charged to operations as incurred.  Upon retirement or sale, any gain or loss is credited or charged to operations.
	(i)    Bank Owned Life Insurance
	The Company has purchased bank owned life insurance contracts to help fund its obligations for certain employee benefit costs.  The Company’s investment in such insurance contracts has been reported in the consolidated balance sheets at their cash surrender values.  Changes in cash surrender values and death benefit proceeds received in excess of the related cash surrender values are recorded as non-interest income.
	(j)    Goodwill
	Intangible assets resulting from acquisitions under the purchase method of accounting consist of goodwill and other intangible assets.  Goodwill is not amortized and is subject to an annual assessment for impairment. The goodwill impairment analysis is generally a two-step test. However, we may, under current accounting guidance, first assess qualitative factors to determine whether it is necessary to perform the two-step quantitative goodwill impairment test. Under current accounting guidance, we are not required to calculate the fair value of a reporting unit if, based on a qualitative assessment, we determine that it was more likely than not that the unit’s fair value was not less than its carrying amount. During 2014, we elected to perform step one of the two-step goodwill impairment test for our reporting unit, but we may choose to perform the optional quantitative assessment in future periods.
	Goodwill is allocated to Northfield’s reporting unit at the date goodwill is actually recorded. If the carrying value of a reporting unit exceeds its estimated fair value, a second step in the analysis is performed to determine the amount of impairment, if any. The second step compares the implied fair value of the reporting unit’s goodwill with the carrying amount of that goodwill. If the carrying value of a reporting unit exceeds the implied fair value of the goodwill, an impairment charge is recorded equal to the excess amount in the current period earnings.
	As of December 31, 2014, the carrying value of goodwill totaled $16.2 million.  The Company performed its annual goodwill impairment test, as of December 31, 2014, and determined that the fair value of the Company’s single reporting unit to be in excess of its carrying value.  The Company will test goodwill for impairment between annual test dates if an event occurs or circumstances change that would indicate the fair value of the reporting unit is below its carrying amount. No events have occurred and no circumstances have changed since the annual impairment test date that would indicate the fair value of the reporting unit is below its carrying amount.
	(k)    Income Taxes
	Income taxes are accounted for under the asset and liability method.  Deferred tax assets and liabilities are recognized for the estimated future tax consequences attributable to temporary differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases.  Deferred tax assets and liabilities are measured using enacted tax rates expected to apply in the year in which those temporary differences are expected to be recovered or settled.  When applicable, deferred tax assets are reduced by a valuation allowance for any portions determined not likely to be realized. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date.
	Income tax benefits are recognized and measured based upon a two-step model: 1) a tax position must be more-likely-than-not to be sustained based solely on its technical merits in order to be recognized, and 2) the benefit is measured as the largest dollar amount of that position that is more-likely-than-not to be sustained upon settlement. The difference between the benefit recognized and the tax benefit claimed on a tax return is referred to as an unrecognized tax benefit (UTB). The Corporation records income tax-related interest and penalties, if applicable, within income tax expense.
	(l)    Impairment of Long‑Lived Assets
	Long‑lived assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of the asset may not be recoverable.  Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to future undiscounted (and without interest) net cash flows expected to be generated by the asset.  If such assets are considered to be impaired, the impairment to be recognized is measured by the amount by which the carrying amount of the assets exceeds the fair value of the assets.  Assets to be disposed of are reported at the lower of the carrying amount or fair value less costs to sell.
	(m)    Securities Sold Under Agreements to Repurchase and Other Borrowings
	The Company enters into sales of securities under agreements to repurchase (Repurchase Agreements) and collateral pledge agreements (Pledge Agreements) with selected dealers and banks.  Such agreements are accounted for as secured financing transactions since the Company maintains effective control over the transferred or pledged securities and the transfer meets the other accounting and recognition criteria as required by the transfer and servicing topic of the FASB Accounting Standards.  Obligations under these agreements are reflected as a liability in the consolidated balance sheets.  Securities underlying the agreements are maintained at selected dealers and banks as collateral for each transaction executed and may be sold or pledged by the counterparty.  Collateral underlying Repurchase Agreements which permit the counterparty to sell or pledge the underlying collateral is disclosed on the consolidated balance sheets as “encumbered.”  The Company retains the right under all Repurchase Agreements and Pledge Agreements to substitute acceptable collateral throughout the terms of the agreement.
	(n)    Comprehensive Income (Loss)
	Comprehensive income (loss) includes net income and the change in unrealized holding gains and losses on securities available-for-sale, change in actuarial gains and losses on other post retirement benefits, and change in service cost on other postretirement benefits, net of taxes.  Comprehensive income (loss) is presented in the Consolidated Statements of Comprehensive Income (Loss).
	(o)   Benefits
	The Company sponsors a defined postretirement benefit plan that provides for medical and life insurance coverage to a limited number of retirees, as well as life insurance to all qualifying employees of the Company.  The estimated cost of postretirement benefits earned is accrued during an individual’s estimated service period to the Company.    The Company recognizes in its balance sheet the over-funded or under-funded status of a defined benefit postretirement plan measured as the difference between the fair value of plan assets and the benefit obligation at the end of our calendar year.  The actuarial gains and losses and the prior service costs and credits that arise during the period are recognized as a component of other comprehensive income (loss), net of tax.
	Funds borrowed by the Employee Stock Ownership Plan (ESOP) from the Company to purchase the Company’s common stock are being repaid from the Bank’s contributions over a period of up to 30 years.  The Company’s common stock not yet allocated to participants is recorded as a reduction of stockholders’ equity at cost.  The Company records compensation expense related to the ESOP at an amount equal to the shares committed to be released by the ESOP multiplied by the average fair value of our common stock during the reporting period.
	The Company recognizes the grant-date fair value of stock based awards issued to participants' as compensation cost in the consolidated statements of comprehensive income (loss).  The fair value of common stock awards is based on the closing price of our common stock as reported on the NASDAQ Stock Market on the grant date.  The expense related to stock options is based on the estimated fair value of the options at the date of the grant using the Black-Scholes pricing model.  The awards are fixed in nature and compensation cost related to stock based awards is recognized on a straight-line basis over the requisite service periods.
	The Bank has a 401(k) plan covering substantially all employees.  Contributions to the plan are expensed as incurred.
	(p)    Segment Reporting
	As a community-focused financial institution, substantially all of the Company’s operations involve the delivery of loan and deposit products to customers.  Management makes operating decisions and assesses performance based on an ongoing review of these community banking operations, which constitute the Company’s only operating segment for financial reporting purposes.
	(q)    Net Income per Common Share
	Net income per common share-basic is computed by dividing the net income available to common stockholders by the weighted average number of common shares outstanding, excluding unallocated ESOP shares and unearned common stock award shares.  The weighted average common shares outstanding includes the average number of shares of common stock outstanding, including shares held by Northfield Bancorp, MHC and allocated or committed to be released ESOP shares.
	Net income per common share-diluted is computed using the same method as basic earnings per share, but reflects the potential dilution that could occur if stock options and unvested shares of restricted stock were exercised and converted into common stock.  These potentially dilutive shares are included in the weighted average number of shares outstanding for the period using the treasury stock method.  When applying the treasury stock method, we add: (1) the assumed proceeds from option exercises; (2) the tax benefit, if any, that would have been credited to additional paid-in capital assuming exercise of non-qualified stock options and vesting of shares of restricted stock; and (3) the average unamortized compensation costs related to unvested shares of restricted stock and stock options.  We then divide this sum by our average stock price for the period to calculate assumed shares repurchased.  The excess of the number of shares issuable over the number of shares assumed to be repurchased is added to basic weighted average common shares to calculate diluted earnings per share.  At December 31, 2014, 2013, and 2012, there were 1,026,130, 922,629 and 776,213 dilutive shares outstanding, respectively.
	(r)    Other Real Estate Owned
	Assets acquired through loan foreclosure, or deed-in-lieu of, are held for sale and are initially recorded at estimated fair value less estimated selling costs when acquired, thus establishing a new cost basis.  Costs after acquisition are generally expensed.  If the estimated fair value of the asset declines, a write-down is recorded through other non-interest expense.

Business_Combinations

Business Combinations	12 Months Ended
	Dec. 31, 2014
Business Combinations [Abstract]
Business Combinations	Business Combinations
	On November 2, 2012, Northfield Bancorp, Inc. completed its acquisition of Flatbush Federal Bancorp, Inc. and its wholly-owned subsidiary, Flatbush Federal Savings and Loan Association, in an all stock transaction.  Stockholders of Flatbush Federal Bancorp, Inc. received 0.4748 shares of Northfield Bancorp, Inc. common stock for each share of Flatbush Federal Bancorp, Inc. common stock that they owned as of the close of business November 2, 2012.  After the completion of the merger, Flatbush Federal Bancorp, Inc. stockholders owned approximately 3.1% of the combined Company.
	Utilizing the acquisition method, the Northfield Bancorp, Inc. acquired total assets of $136.6 million including $81.9 million in loans (primarily one-to-four family and commercial real estate loans) and $32.7 million in securities, and assumed total liabilities of $119.2 million including $110.6 million of deposits and equity of $17.5 million.

Securities_AvailableForSale

Securities Available-For-Sale	12 Months Ended
	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Securities Available-For-Sale	Securities Available-for-Sale
	The following is a comparative summary of mortgage-backed securities and other securities available-for-sale at December 31, 2014 and 2013 (in thousands):
		2014
					Gross			Gross			Estimated
		Amortized			unrealized			unrealized			fair
		cost			gains			losses			value
	Mortgage-backed securities:
	Pass-through certificates:
	Government sponsored enterprises (GSE)	$	292,162		$	8,309		$	1,131		$	299,340
	Real estate mortgage investment conduits (REMICs):
	GSE	408,328			1,314			9,192			400,450
	Non-GSE	1,060			—			34			1,026
		701,550			9,623			10,357			700,816
	Other securities:
	Equity investments-mutual funds	410			—			—			410
	Corporate bonds	69,975			40			2			70,013
		70,385			40			2			70,423
	Total securities available-for-sale	$	771,935		$	9,663		$	10,359		$	771,239
		2013
					Gross			Gross			Estimated
		Amortized			unrealized			unrealized			fair
		cost			gains			losses			value
	Mortgage-backed securities:
	Pass-through certificates:
	GSE	$	366,884		$	8,573		$	5,113		$	370,344
	Real estate mortgage investment conduits (REMICs):
	GSE	497,575			1,699			14,047			485,227
	Non-GSE	4,474			126			48			4,552
		868,933			10,398			19,208			860,123
	Other securities:
	Equity investments-mutual funds	510			—			—			510
	Corporate bonds	76,491			66			105			76,452
		77,001			66			105			76,962
	Total securities available-for-sale	$	945,934		$	10,464		$	19,313		$	937,085
	The following is a summary of the expected maturity distribution of debt securities available-for-sale other than mortgage‑backed securities at December 31, 2014 (in thousands):
	Available-for-sale		Amortized cost			Estimated fair value
	Due in one year or less		$	41,750		$	41,768
	Due after one year through five years		28,225			28,245
			$	69,975		$	70,013
	Expected maturities on mortgage‑backed securities will differ from contractual maturities as borrowers may have the right to call or prepay obligations with or without penalties.
	Certain securities available-for-sale are pledged or encumbered to secure borrowings under Pledge Agreements and Repurchase Agreements and for other purposes required by law.  At December 31, 2014, and December 31, 2013, securities available-for-sale with a carrying value of $13.8 million and $14.4 million, respectively, were pledged to secure deposits.  See Note 8 for further discussion regarding securities pledged or encumbered for borrowings.
	For the year ended December 31, 2014, the Company had gross proceeds of $12.0 million on sales of securities available-for-sale with gross realized gains of approximately $382,000 and no gross realized losses.  For the year ended December 31, 2013, the Company had gross proceeds of $259.6 million on sales of securities available-for-sale with gross realized gains and gross realized losses of approximately $3.1 million and $128,000,  respectively.  For the year ended December 31, 2012, the Company had gross proceeds of $207.7 million on sales of securities available-for-sale with gross realized gains and gross realized losses of approximately $3.0 million and $490,000,  respectively. The Company routinely sells securities when market pricing presents, in management’s assessment, an economic benefit that outweighs holding such security, and when smaller balance securities become cost prohibitive to carry.
	The Company did not recognize any other-than-temporary impairment charges in earnings during the year ended December 31, 2014. The Company recognized in earnings other-than-temporary impairment charges of $434,000 during the year ended December 31, 2013, related to one equity investment in a mutual fund.  The Company recognized in earnings other-than-temporary impairment charges of $24,000 during the year ended December 31, 2012, related to one equity investment in a mutual fund.
	The following is a roll forward of 2014, 2013, and 2012 activity related to the credit component of other-than-temporary impairment recognized on debt securities in pre-tax earnings, for which a portion of other-than-temporary impairment was recognized in accumulated other comprehensive income (in thousands):
		2014			2013			2012
	Balance, beginning of year	$	—		$	—		$	578
	Additions to the credit component on debt securities in which other-than-temporary
	impairment was not previously recognized	—			—			—
	Reductions due to sales	—			—			(578		)
	Cumulative pre-tax credit losses, end of year	$	—		$	—		$	—
	Gross unrealized losses on mortgage-backed securities, equity securities, agency bonds, and corporate bonds available-for-sale, and the estimated fair value of the related securities, aggregated by security category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2014 and 2013, were as follows (in thousands):
		December 31, 2014
		Less than 12 months						12 months or more					Total
		Unrealized			Estimated			Unrealized			Estimated		Unrealized		Estimated
		losses			fair value			losses			fair value		losses		fair value
	Mortgage-backed securities:
	Pass-through certificates:
	GSE	$	1		$	181		$	1,130		$	61,526	$	1,131	$	61,707
	REMICs:
	GSE	30			3,179			9,162			229,896		9,192		233,075
	Non-GSE	—			—			34			1,026		34		1,026
	Other securities:
	Corporate bonds	2			9,996			—			—		2		9,996
	Total	$	33		$	13,356		$	10,326		$	292,448	$	10,359	$	305,804
	December 31, 2013
	Less than 12 months						12 months or more					Total
	Unrealized			Estimated			Unrealized			Estimated		Unrealized		Estimated
	losses			fair value			losses			fair value		losses		fair value
Mortgage-backed securities:
Pass-through certificates:
GSE	$	5,087		$	150,473		$	26		$	4,482	$	5,113	$	154,955
REMICs:
GSE	12,923			283,419			1,124			44,606		14,047		328,025
Non-GSE	23			1,092			25			442		48		1,534
Other securities:
Corporate bonds	105			44,763			—			—		105		44,763
Total	$	18,138		$	479,747		$	1,175		$	49,530	$	19,313	$	529,277
The Company held 13 pass-through mortgage-backed securities issued or guaranteed by GSEs, 14 REMIC mortgage-backed securities issued or guaranteed by GSEs, and two REMIC mortgage-backed securities not issued or guaranteed by GSEs that were in a continuous unrealized loss position of greater than twelve months at December 31, 2014. There were four pass-through mortgage-backed securities issued or guaranteed by GSEs, one REMIC mortgage-backed security issued or guaranteed by GSEs, and one corporate security that were in an unrealized loss position of less than twelve months, and rated investment grade at December 31, 2014.  The declines in value relate to the general interest rate environment and are considered temporary.  The securities cannot be prepaid in a manner that would result in the Company not receiving all of its amortized cost.  The Company neither has an intent to sell, nor is it more likely than not that the Company will be required to sell, the securities before the recovery of their amortized cost basis or, if necessary, maturity.
The fair values of our investment securities could decline in the future if the underlying performance of the collateral for the collateralized mortgage obligations or other securities deteriorates and our credit enhancement levels do not provide sufficient protections to our contractual principal and interest.  As a result, there is a risk that significant other-than-temporary impairments may occur in the future given the current economic environment.

Securities_HeldToMaturity

Securities Held-To-Maturity	12 Months Ended
	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Securities Held-To-Maturity	Securities Held-to-Maturity
	The following is a summary of mortgage-backed securities held-to-maturity at December 31, 2014 (in thousands):
		2014
		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
	Mortgage-backed securities:
	Pass-through certificates:
	GSEs	3,609		82		$	—	3,691
	Total securities held-to-maturity	$	3,609	$	82	$	—	$	3,691
	Expected maturities on mortgage‑backed securities will differ from contractual maturities as borrowers may have the right to call or prepay obligations with or without penalties. The Company had no held-to-maturity securities at December 31, 2014 that were in an unrealized loss position. The Company had no held-to-maturity securities at December 31, 2013.

Loans

Loans	12 Months Ended
	Dec. 31, 2014
Receivables [Abstract]
Loans	Loans
	Loans held-for-investment, net, consists of the following (in thousands):
		December 31,
		2014				2013
	Real estate loans:
	Multifamily	$	1,072,193			$	870,951
	Commercial mortgage	390,288				340,174
	One-to-four family residential mortgage	74,401				64,753
	Home equity and lines of credit	54,533				46,231
	Construction and land	21,412				14,152
	Total real estate loans	1,612,827				1,336,261
	Commercial and industrial loans	12,945				10,162
	Other loans	2,157				2,310
	Total commercial and industrial and other loans	15,102				12,472
	Deferred loan cost, net	4,565				3,458
	Originated loans held-for-investment, net	1,632,494				1,352,191
	PCI Loans	44,816				59,468
	Loans acquired:
	One-to-four family residential mortgage	234,478				60,262
	Multifamily	18,844				3,930
	Commercial mortgage	11,999				13,254
	Construction and land	364				371
	Total loans acquired	265,685				77,817
	Loans held for investment, net	1,942,995				1,489,476
	Allowance for loan losses	(26,292		)		(26,037		)
	Net loans held-for-investment	$	1,916,703			$	1,463,439
	The Company had no loans held-for-sale at December 31, 2014, and $471,000 in loans held-for-sale at December 31, 2013.  Loans held-for-sale included $471,000 of non-accrual loans at December 31, 2013.
	PCI loans, primarily acquired as part of a Federal Deposit Insurance Corporation-assisted transaction, totaled $44.8 million at December 31, 2014, as compared to $59.5 million at December 31, 2013.  The Company accounts for PCI loans utilizing generally accepting accounting principles applicable to loans acquired with deteriorated credit quality.  At December 31, 2014, PCI loans consist of approximately 33% commercial real estate loans and 53% commercial and industrial loans, with the remaining balance in residential and home equity loans.  At December 31, 2013, PCI loans consist of approximately 37% commercial real estate loans and 47% commercial and industrial loans, with the remaining balance in residential and home equity loans. The following details the accretable yield (in thousands):
		For The Year Ended December 31,
		2014				2013
	Balance at the beginning of year	$	32,464			$	43,431
	Accretable yield at purchase date	—				—
	Accretion into interest income	(4,895		)		(5,701		)
	Net reclassification from non-accretable difference (1)	374				(5,266		)
	Balance at end of year	$	27,943			$	32,464
	(1) Due to re-casting of cash flows for loan pools acquired in the 2011 FDIC-assisted transaction.
	At December 31, 2014 and 2013, PCI loans included $2.8 million and $3.6 million, respectively, of loans acquired as part of the acquisition of Flatbush Federal Bancorp, Inc. and its wholly-owned subsidiary, Flatbush Federal Savings and Loan Association.
	The Company does not have any lending programs commonly referred to as subprime lending.  Subprime lending generally targets borrowers with weakened credit histories typically characterized by payment delinquencies, previous charge-offs, judgments, bankruptcies, or borrowers with questionable repayment capacity as evidenced by low credit scores or high debt-burden ratios.
	During 2012, we sold the servicing rights of loans sold to Freddie Mac to a third-party bank.  These one-to-four family residential mortgage real estate loans were underwritten to Freddie Mac guidelines and to comply with applicable federal, state, and local laws.  At the time of the closing of these loans the Company owned the loans and subsequently sold them to Freddie Mac providing normal and customary representations and warranties, including representations and warranties related to compliance with Freddie Mac underwriting standards.  At the time of sale, the loans were free from encumbrances except for the mortgages filed by the Company which, with other underwriting documents, were subsequently assigned and delivered to Freddie Mac.  At the time of sale to the third-party, substantially all of the loans serviced for Freddie Mac were performing in accordance with their contractual terms and management believes that it has no significant repurchase obligations associated with these loans.
	We provide for loan losses based on the consistent application of our documented allowance for loan loss methodology.  Loan losses are charged to the allowance for loans losses and recoveries are credited to it.  Additions to the allowance for loan losses are provided by charges against income based on various factors which, in our judgment, deserve current recognition in estimating probable losses.  Loan losses are charged-off in the period the loans, or portion thereof, are deemed uncollectible.  Generally, the Company will record a loan charge-off (including a partial charge-off) to reduce a loan to the estimated fair value of the underlying collateral, less cost to sell, for collateral dependent loans.  We regularly review the loan portfolio in order to maintain the allowance for loan losses in accordance with U.S. GAAP.   At December 31, 2014 and 2013, the allowance for loan losses related to loans held-for-investment (excluding PCI loans) consisted primarily of the following two components:
	-1	Specific allowances are established for impaired loans (generally defined by the Company as non-accrual loans with an outstanding balance of $500,000 or greater and all loans restructured in troubled debt restructurings). The amount of impairment, if any, provided for as a specific reserve determined by the deficiency, if any, between the present value of expected future cash flows discounted at the original loan’s effective interest rate or the underlying collateral value (less estimated costs to sell,) if the loan is collateral dependent, and the carrying value of the loan. Impaired loans that have no impairment losses are not considered for general allowances described below. Generally, the Company charges down a loan to the estimated fair value of the underlying collateral, less costs to sell for collateral dependent loans and, if necessary, maintains a specific reserve in the allowance for loan losses related to cash flow dependent impaired loans where the present value of the expected future cash flows, discounted at the loan’s original contractual interest rate, is less than the carrying value of the loan unless management determines that such shortfall should be charged off.
	-2	General allowances are established for loan losses on a portfolio basis for loans that do not meet the definition of impaired. The portfolio is grouped into similar risk characteristics, primarily loan type, loan-to-value, if collateral dependent, and internal credit risk ratings. We apply an estimated loss rate to each loan group. The loss rates applied are based on our loss experience (using appropriate look-back and loss emergence periods) as adjusted for our qualitative assessment of relevant changes related to: underwriting standards; delinquency trends; collection, charge-off and recovery practices; the nature or volume of the loan group; changes in lending staff; concentration of loan type; current economic conditions; and other relevant factors considered appropriate by management. The loss emergence period is the estimated time from the date of the loss event to the actual recognition of the loss (typically via the first charge-off), and is determined based upon a study of the Company's past loss experience by loan group This evaluation is inherently subjective, as it requires material estimates that may be susceptible to significant revisions based upon changes in economic and real estate market conditions, and incorporates matters that are not fully captured in the loss experience. Actual loan losses may be significantly more than the allowance for loan losses we have established, which could have a material negative effect on our financial results. We also maintain an unallocated component related to the general loss allocation.  The primary purpose of the unallocated component is to account for the inherent imprecision of the loss estimation process related primarily to periodic updating of appraisals on impaired loans and the internal and external credit risk rating process, including loans that are not subject to an independent third party review, such as loans that are less than $500,000.
	Additionally, loans acquired with no evidence of credit deterioration are held-for-investment and initially valued at an estimated fair value on the date of acquisition, with no initial related allowance for loan losses. These loans are evaluated for impairment on quarterly basis as part of our analysis of the allowance for loan losses.
	In underwriting a loan secured by real property, we require an appraisal (or an automated valuation model) of the property by an independent licensed appraiser approved by the Company’s board of directors.  The appraisal is subject to review by an independent third-party hired by the Company.  We review and inspect properties before disbursement of funds during the term of a construction loan.  Generally, management obtains updated appraisals when a loan is deemed impaired, or sooner if management deems it appropriate.  These appraisals may be more limited than those prepared for the underwriting of a new loan.  In addition, when the Company acquires other real estate owned, it generally obtains a current appraisal to substantiate the net carrying value of the asset.
	The adjustments to our loss experience are based on our evaluation of several environmental factors, including:
	•	changes in lending policies and procedures
	•	changes in local, regional, national, and international economic and business conditions and developments that affect the collectability of our portfolio, including the condition of various market segments;
	•	changes in the nature and volume of our portfolio and in the terms of our loans;
	•	changes in the experience, ability and depth of lending management and other relevant staff;
	•	changes in the volume and severity of past due loans, the volume of nonaccrual loans, and the volume and severity of adversely classified or graded loans;
	•	changes in the quality of our loan review system;
	•	changes in the value of underlying collateral for collateral-dependent loans;
	•	the existence and effect of any concentrations of credit, and changes in the level of such concentrations; and
	•	the effect of other external factors such as competition and legal and regulatory requirements on the level of estimated credit losses in our existing portfolio.
	In evaluating the estimated loss factors to be utilized for each loan group, management also reviews actual net loss history over an extended period of time as reported by the FDIC for institutions both in our market area and nationally for periods that are believed to have experienced similar economic conditions.
	We evaluate the allowance for loan losses based on the combined total of the impaired and general components for originated loans.  Generally when the loan portfolio increases, absent other factors, our allowance for loan loss methodology results in a higher dollar amount of estimated probable losses.  Conversely, when the loan portfolio decreases, absent other factors, our allowance for loan loss methodology results in a lower dollar amount of estimated probable losses.
	Each quarter we evaluate the allowance for loan losses and adjust the allowance as appropriate through a provision for loan losses.  While we use the best information available to make evaluations, future adjustments to the allowance may be necessary if conditions differ substantially from the information used in making the evaluations.  In addition, as an integral part of their examination process, the Office of the Comptroller of the Currency (“OCC”) will periodically review the allowance for loan losses.  The OCC may require us to adjust the allowance based on their analysis of information available to them at the time of their examination.  Our last examination date was as of June 30, 2014.
	A summary of changes in the allowance for loan losses for the years ended December 31, 2014, 2013, and 2012 follows (in thousands):
		December 31,
		2014				2013				2012
	Balance at beginning of year	$	26,037			$	26,424			$	26,836
	Provision for loan losses	645				1,927				3,536
	Recoveries	402				860				245
	Charge-offs	(792		)		(3,174		)		(4,193		)
Balance at end of year	$	26,292			$	26,037			$	26,424
Loans
Loans held-for-investment, net, consists of the following (in thousands):
	December 31,
	2014				2013
Real estate loans:
Multifamily	$	1,072,193			$	870,951
Commercial mortgage	390,288				340,174
One-to-four family residential mortgage	74,401				64,753
Home equity and lines of credit	54,533				46,231
Construction and land	21,412				14,152
Total real estate loans	1,612,827				1,336,261
Commercial and industrial loans	12,945				10,162
Other loans	2,157				2,310
Total commercial and industrial and other loans	15,102				12,472
Deferred loan cost, net	4,565				3,458
Originated loans held-for-investment, net	1,632,494				1,352,191
PCI Loans	44,816				59,468
Loans acquired:
One-to-four family residential mortgage	234,478				60,262
Multifamily	18,844				3,930
Commercial mortgage	11,999				13,254
Construction and land	364				371
Total loans acquired	265,685				77,817
Loans held for investment, net	1,942,995				1,489,476
Allowance for loan losses	(26,292		)		(26,037		)
Net loans held-for-investment	$	1,916,703			$	1,463,439
The Company had no loans held-for-sale at December 31, 2014, and $471,000 in loans held-for-sale at December 31, 2013.  Loans held-for-sale included $471,000 of non-accrual loans at December 31, 2013.
PCI loans, primarily acquired as part of a Federal Deposit Insurance Corporation-assisted transaction, totaled $44.8 million at December 31, 2014, as compared to $59.5 million at December 31, 2013.  The Company accounts for PCI loans utilizing generally accepting accounting principles applicable to loans acquired with deteriorated credit quality.  At December 31, 2014, PCI loans consist of approximately 33% commercial real estate loans and 53% commercial and industrial loans, with the remaining balance in residential and home equity loans.  At December 31, 2013, PCI loans consist of approximately 37% commercial real estate loans and 47% commercial and industrial loans, with the remaining balance in residential and home equity loans. The following details the accretable yield (in thousands):
	For The Year Ended December 31,
	2014				2013
Balance at the beginning of year	$	32,464			$	43,431
Accretable yield at purchase date	—				—
Accretion into interest income	(4,895		)		(5,701		)
Net reclassification from non-accretable difference (1)	374				(5,266		)
Balance at end of year	$	27,943			$	32,464
(1) Due to re-casting of cash flows for loan pools acquired in the 2011 FDIC-assisted transaction.
At December 31, 2014 and 2013, PCI loans included $2.8 million and $3.6 million, respectively, of loans acquired as part of the acquisition of Flatbush Federal Bancorp, Inc. and its wholly-owned subsidiary, Flatbush Federal Savings and Loan Association.
The Company does not have any lending programs commonly referred to as subprime lending.  Subprime lending generally targets borrowers with weakened credit histories typically characterized by payment delinquencies, previous charge-offs, judgments, bankruptcies, or borrowers with questionable repayment capacity as evidenced by low credit scores or high debt-burden ratios.
During 2012, we sold the servicing rights of loans sold to Freddie Mac to a third-party bank.  These one-to-four family residential mortgage real estate loans were underwritten to Freddie Mac guidelines and to comply with applicable federal, state, and local laws.  At the time of the closing of these loans the Company owned the loans and subsequently sold them to Freddie Mac providing normal and customary representations and warranties, including representations and warranties related to compliance with Freddie Mac underwriting standards.  At the time of sale, the loans were free from encumbrances except for the mortgages filed by the Company which, with other underwriting documents, were subsequently assigned and delivered to Freddie Mac.  At the time of sale to the third-party, substantially all of the loans serviced for Freddie Mac were performing in accordance with their contractual terms and management believes that it has no significant repurchase obligations associated with these loans.
We provide for loan losses based on the consistent application of our documented allowance for loan loss methodology.  Loan losses are charged to the allowance for loans losses and recoveries are credited to it.  Additions to the allowance for loan losses are provided by charges against income based on various factors which, in our judgment, deserve current recognition in estimating probable losses.  Loan losses are charged-off in the period the loans, or portion thereof, are deemed uncollectible.  Generally, the Company will record a loan charge-off (including a partial charge-off) to reduce a loan to the estimated fair value of the underlying collateral, less cost to sell, for collateral dependent loans.  We regularly review the loan portfolio in order to maintain the allowance for loan losses in accordance with U.S. GAAP.   At December 31, 2014 and 2013, the allowance for loan losses related to loans held-for-investment (excluding PCI loans) consisted primarily of the following two components:
-1	Specific allowances are established for impaired loans (generally defined by the Company as non-accrual loans with an outstanding balance of $500,000 or greater and all loans restructured in troubled debt restructurings). The amount of impairment, if any, provided for as a specific reserve determined by the deficiency, if any, between the present value of expected future cash flows discounted at the original loan’s effective interest rate or the underlying collateral value (less estimated costs to sell,) if the loan is collateral dependent, and the carrying value of the loan. Impaired loans that have no impairment losses are not considered for general allowances described below. Generally, the Company charges down a loan to the estimated fair value of the underlying collateral, less costs to sell for collateral dependent loans and, if necessary, maintains a specific reserve in the allowance for loan losses related to cash flow dependent impaired loans where the present value of the expected future cash flows, discounted at the loan’s original contractual interest rate, is less than the carrying value of the loan unless management determines that such shortfall should be charged off.
-2	General allowances are established for loan losses on a portfolio basis for loans that do not meet the definition of impaired. The portfolio is grouped into similar risk characteristics, primarily loan type, loan-to-value, if collateral dependent, and internal credit risk ratings. We apply an estimated loss rate to each loan group. The loss rates applied are based on our loss experience (using appropriate look-back and loss emergence periods) as adjusted for our qualitative assessment of relevant changes related to: underwriting standards; delinquency trends; collection, charge-off and recovery practices; the nature or volume of the loan group; changes in lending staff; concentration of loan type; current economic conditions; and other relevant factors considered appropriate by management. The loss emergence period is the estimated time from the date of the loss event to the actual recognition of the loss (typically via the first charge-off), and is determined based upon a study of the Company's past loss experience by loan group This evaluation is inherently subjective, as it requires material estimates that may be susceptible to significant revisions based upon changes in economic and real estate market conditions, and incorporates matters that are not fully captured in the loss experience. Actual loan losses may be significantly more than the allowance for loan losses we have established, which could have a material negative effect on our financial results. We also maintain an unallocated component related to the general loss allocation.  The primary purpose of the unallocated component is to account for the inherent imprecision of the loss estimation process related primarily to periodic updating of appraisals on impaired loans and the internal and external credit risk rating process, including loans that are not subject to an independent third party review, such as loans that are less than $500,000.
Additionally, loans acquired with no evidence of credit deterioration are held-for-investment and initially valued at an estimated fair value on the date of acquisition, with no initial related allowance for loan losses. These loans are evaluated for impairment on quarterly basis as part of our analysis of the allowance for loan losses.
In underwriting a loan secured by real property, we require an appraisal (or an automated valuation model) of the property by an independent licensed appraiser approved by the Company’s board of directors.  The appraisal is subject to review by an independent third-party hired by the Company.  We review and inspect properties before disbursement of funds during the term of a construction loan.  Generally, management obtains updated appraisals when a loan is deemed impaired, or sooner if management deems it appropriate.  These appraisals may be more limited than those prepared for the underwriting of a new loan.  In addition, when the Company acquires other real estate owned, it generally obtains a current appraisal to substantiate the net carrying value of the asset.
The adjustments to our loss experience are based on our evaluation of several environmental factors, including:
•	changes in lending policies and procedures
•	changes in local, regional, national, and international economic and business conditions and developments that affect the collectability of our portfolio, including the condition of various market segments;
•	changes in the nature and volume of our portfolio and in the terms of our loans;
•	changes in the experience, ability and depth of lending management and other relevant staff;
•	changes in the volume and severity of past due loans, the volume of nonaccrual loans, and the volume and severity of adversely classified or graded loans;
•	changes in the quality of our loan review system;
•	changes in the value of underlying collateral for collateral-dependent loans;
•	the existence and effect of any concentrations of credit, and changes in the level of such concentrations; and
•	the effect of other external factors such as competition and legal and regulatory requirements on the level of estimated credit losses in our existing portfolio.
In evaluating the estimated loss factors to be utilized for each loan group, management also reviews actual net loss history over an extended period of time as reported by the FDIC for institutions both in our market area and nationally for periods that are believed to have experienced similar economic conditions.
We evaluate the allowance for loan losses based on the combined total of the impaired and general components for originated loans.  Generally when the loan portfolio increases, absent other factors, our allowance for loan loss methodology results in a higher dollar amount of estimated probable losses.  Conversely, when the loan portfolio decreases, absent other factors, our allowance for loan loss methodology results in a lower dollar amount of estimated probable losses.
Each quarter we evaluate the allowance for loan losses and adjust the allowance as appropriate through a provision for loan losses.  While we use the best information available to make evaluations, future adjustments to the allowance may be necessary if conditions differ substantially from the information used in making the evaluations.  In addition, as an integral part of their examination process, the Office of the Comptroller of the Currency (“OCC”) will periodically review the allowance for loan losses.  The OCC may require us to adjust the allowance based on their analysis of information available to them at the time of their examination.  Our last examination date was as of June 30, 2014.
A summary of changes in the allowance for loan losses for the years ended December 31, 2014, 2013, and 2012 follows (in thousands):
	December 31,
	2014				2013				2012
Balance at beginning of year	$	26,037			$	26,424			$	26,836
Provision for loan losses	645				1,927				3,536
Recoveries	402				860				245
Charge-offs	(792		)		(3,174		)		(4,193		)
Balance at end of year	$	26,292			$	26,037			$	26,424
The following table sets forth activity in our allowance for loan losses, by loan type, for the years ended December 31, 2014 and 2013.  The following table also details the amount of loans receivable held-for-investment, net of deferred loan fees and costs, that are evaluated individually, and collectively, for impairment, and the related portion of allowance for loan losses that is allocated to each loan portfolio segment (in thousands).
	December 31, 2014
	Real Estate
	Commercial				One-to-Four Family				Construction and Land			Multifamily			Home Equity and Lines of Credit			Commercial and Industrial			Other			Unallocated			Originated Loans Total			PCI			Acquired Loans		Total
Allowance for loan losses:
Beginning Balance	$	12,619			$	875			$	205		$	9,374		$	860		$	425		$	67		$	1,024		$	25,449		$	588		$	—	$	26,037
Charge-offs	(103		)		(58		)		—			(7		)	(489		)	(135		)	—			—			(792		)	—			—		(792		)
Recoveries	72				—				246			35			—			8			41			—			402			—			—		402
Provisions (credit)	(3,279		)		134				(185		)	2,817			530			543			26			185			771			(188		)	62		645
Ending Balance	$	9,309			$	951			$	266		$	12,219		$	901		$	841		$	134		$	1,209		$	25,830		$	400		$	62	$	26,292
Ending balance: individually evaluated for impairment	$	2,361			$	57			$	—		$	215		$	13		$	109		$	—		$	—		$	2,755		$	—		$	—	$	2,755
Ending balance: collectively evaluated for impairment	$	6,948			$	894			$	266		$	12,004		$	888		$	732		$	134		$	1,209		$	23,075		$	400		$	62	$	23,537
Loans, net:
Ending Balance	$	390,885			$	74,990			$	21,445		$	1,074,539		$	55,486		$	12,992		$	2,157		$	—		$	1,632,494		$	44,816		$	265,685	$	1,942,995
Ending balance: individually evaluated for impairment	$	29,224			$	1,072			$	—		$	1,990		$	327		$	806		$	—		$	—		$	33,419		$	—		$	855	$	34,274
Ending balance: collectively evaluated for impairment	$	361,661			$	73,918			$	21,445		$	1,072,549		$	55,159		$	12,186		$	2,157		$	—		$	1,599,075		$	44,816		$	264,830	$	1,908,721
	31-Dec-13
	Real Estate
	Commercial				One-to-Four Family				Construction and Land			Multifamily			Home Equity and Lines of Credit			Commercial and Industrial			Other			Unallocated			Originated Loans Total			PCI			Acquired Loans		Total
Allowance for loan losses:
Beginning Balance	$	14,480			$	623			$	994		$	7,086		$	623		$	1,160		$	21		$	1,201		$	26,188		$	236		$	—	$	26,424
Charge-offs	(1,208		)		(414		)		—			(657		)	(491		)	(379		)	(25		)	—			(3,174		)	—			—		(3,174		)
Recoveries	1				18				567			—			—			201			73			—			860			—			—		860
Provisions (credit)	(654		)		648				(1,356		)	2,945			728			(557		)	(2		)	(177		)	1,575			352			—		1,927
Ending Balance	$	12,619			$	875			$	205		$	9,374		$	860		$	425		$	67		$	1,024		$	25,449		$	588		$	—	$	26,037
Ending balance: individually evaluated for impairment	$	2,385			$	19			$	—		$	117		$	7		$	104		$	—		$	—		$	2,632		$	—		$	—	$	2,632
Ending balance: collectively evaluated for impairment	$	10,234			$	856			$	205		$	9,257		$	853		$	321		$	67		$	1,024		$	22,817		$	588		$	—	$	23,405
Loans, net:
Ending Balance	$	340,534			$	65,289			$	14,161		$	872,901		$	46,825		$	10,202		$	2,279		$	—		$	1,352,191		$	59,468		$	77,817	$	1,489,476
Ending balance: individually evaluated for impairment	$	32,194			$	1,115			$	109		$	2,074		$	1,341		$	1,504		$	—		$	—		$	38,337		$	—		$	—	$	38,337
Ending balance: collectively evaluated for impairment	$	308,340			$	64,174			$	14,052		$	870,827		$	45,484		$	8,698		$	2,279		$	—		$	1,313,854		$	59,468		$	77,817	$	1,451,139
Included in loans receivable (including held-for-sale) are loans for which the accrual of interest income has been discontinued due to deterioration in the financial condition of the borrowers.  The recorded investment of these nonaccrual loans was $13.9 million and $17.8 million at December 31, 2014, and December 31, 2013, respectively.  Generally, originated loans (both held-for-investment and held-for-sale) are placed on non-accruing status when they become 90 days or more delinquent, or sooner if considered appropriate by management, and remain on non-accrual status until they are brought current, have six months of performance under the loan terms, and factors indicating reasonable doubt about the timely collection of payments no longer exist.  Therefore, loans may be current in accordance with their loan terms, or may be less than 90 days delinquent and still be on a non-accruing status.
Non-accrual amounts include loans deemed to be impaired of $10.1 million and $13.5 million at December 31, 2014, and December 31, 2013, respectively.  Loans on non-accrual status with principal balances less than $500,000, and therefore not meeting the Company’s definition of an impaired loan, amounted to $3.8 million at both December 31, 2014, and December 31, 2013.  Non-accrual amounts included in loans held-for-sale were $0 and $471,000 at December 31, 2014, and December 31, 2013, respectively.  Loans past due ninety days or more and still accruing interest were $708,000 and $32,000 at December 31, 2014,  and December 31, 2013, respectively, and consisted of loans that are well secured and in the process of collection.
The following table sets forth the detail, and delinquency status, of non-performing loans (non-accrual loans and loans past due ninety days or more and still accruing), net of deferred fees and costs, at December 31, 2014 and 2013 (in thousands), excluding PCI loans which have been segregated into pools.  For PCI loans, each loan pool is accounted for as a single asset with a single composite interest rate and an aggregate expectation of cash flows.
	At December 31, 2014
	Total Non-Performing Loans
	Non-Accruing Loans
	0-29 Days Past Due				30-89 Days Past Due				90 Days or More Past Due			Total			90 Days or More Past Due and Accruing			Total Non-Performing Loans
Loans held-for-investment:
Real estate loans:
Commercial
LTV =t; 35%
Substandard	—				395				10,769			11,164			—			11,164
Total commercial	—				395				10,769			11,164			—			11,164
One-to-four family residential
LTV < 60%
Substandard	—				190				674			864			286			1,150
Total	—				190				674			864			286			1,150
LTV =t; 60%
Substandard	—				—				1,028			1,028			—			1,028
Total	—				—				1,028			1,028			—			1,028
Total one-to-four family residential	—				190				1,702			1,892			286			2,178
Home equity and lines of credit
Substandard	—				98				—			98			—			98
Total home equity and lines of credit	—				98				—			98			—			98
Commercial and industrial loans
Substandard	—				—				408			408			—			408
Total commercial and industrial loans	—				—				408			408			—			408
Total non-performing loans held-for-investment	—				683				12,879			13,562			286			13,848
Loans acquired:
One-to-four family residential
LTV < 60%
Pass	—				—				—			—			422			422
Substandard	—				—				313			313			—			313
Total one-to-four family residential	—				—				313			313			422			735
Total non-performing loans acquired	—				—				313			313			422			735
Total non-performing loans	$	—			$	683			$	13,192		$	13,875		$	708		$	14,583
	At December 31, 2013
	Total Non-Performing Loans
	Non-Accruing Loans
	0-29 Days Past Due				30-89 Days Past Due				90 Days or More Past Due			Total			90 Days or More Past Due and Accruing			Total Non-Performing Loans
Loans held-for-investment:
Real estate loans:
Commercial
LTV =t; 35%
Special Mention	—				—				335			335			—			335
Substandard	3,606				421				7,836			11,863			—			11,863
Total commercial	3,606				421				8,171			12,198			—			12,198
One-to-four family residential
LTV < 60%
Special Mention	—				16				114			130			—			130
Substandard	—				418				186			604			—			604
Total	—				434				300			734			—			734
LTV =t; 60%
Substandard	—				189				993			1,182			—			1,182
Total	—				189				993			1,182			—			1,182
Total one-to-four family residential	—				623				1,293			1,916			—			1,916
Construction and land
Substandard	108				—				—			108			—			108
Total construction and land	108				—				—			108			—			108
Multifamily
LTV =t; 35%
Substandard	—				—				73			73			—			73
Total multifamily	—				—				73			73			—			73
Home equity and lines of credit
Substandard	—				—				1,239			1,239			—			1,239
Total home equity and lines of credit	—				—				1,239			1,239			—			1,239
Commercial and industrial loans
Substandard	—				—				441			441			—			441
Total commercial and industrial loans	—				—				441			441			—			441
Other loans
Pass	—				—				—			—			32			32
Total other loans	—				—				—			—			32			32
Total non-performing loans held-for-investment	$	3,714			$	1,044			$	11,217		$	15,975		$	32		$	16,007
Loans acquired:
One-to-four family residential
LTV =t; 60%
Substandard	607				—				466			1,073			—			1,073
Total one-to-four family residential	607				—				466			1,073			—			1,073
Commercial and industrial loans
LTV =t; 35%
Special Mention	—				—				252			252			—			252
Total commercial and industrial loans	—				—				252			252			—			252
Total non-performing loans acquired	607				—				718			1,325			—			1,325
Total non-performing loans	$	4,321			$	1,044			$	11,935		$	17,300		$	32		$	17,332
The following table sets forth the detail and delinquency status of originated loans receivable held-for-investment and acquired loans, net of deferred fees and costs, by performing and non-performing loans at December 31, 2014 and 2013 (in thousands).
	December 31, 2014
	Performing (Accruing) Loans
	0-29 Days Past Due				30-89 Days Past Due				Total			Non-Performing Loans			Total Loans Receivable, net
Loans held-for-investment:
Real estate loans:
Commercial
LTV < 35%
Pass	$	47,534			$	—			$	47,534		$	—		$	47,534
Special Mention	2,436				—				2,436			—			2,436
Total	49,970				—				49,970			—			49,970
LTV =t; 35%
Pass	288,915				878				289,793			—			289,793
Special Mention	9,792				—				9,792			—			9,792
Substandard	25,073				5,093				30,166			11,164			41,330
Total	323,780				5,971				329,751			11,164			340,915
Total commercial	373,750				5,971				379,721			11,164			390,885
One-to-four family residential
LTV < 60%
Pass	29,288				341				29,629			—			29,629
Special Mention	1,143				—				1,143			—			1,143
Substandard	867				286				1,153			1,150			2,303
Total	31,298				627				31,925			1,150			33,075
LTV =t; 60%
Pass	38,062				2,465				40,527			—			40,527
Special Mention	—				—				—			—			—
Substandard	—				360				360			1,028			1,388
Total	38,062				2,825				40,887			1,028			41,915
Total one-to-four family residential	69,360				3,452				72,812			2,178			74,990
Construction and land
Pass	21,445				—				21,445			—			21,445
Total construction and land	21,445				—				21,445			—			21,445
Multifamily
LTV < 35%
Pass	64,692				—				64,692			—			64,692
Special Mention	283				—				283			—			283
Substandard	801				—				801			—			801
Total	65,776				—				65,776			—			65,776
LTV=gt; 35%
Pass	999,469				239				999,708			—			999,708
Special Mention	3,822				520				4,342			—			4,342
Substandard	4,382				331				4,713			—			4,713
Total	1,007,673				1,090				1,008,763			—			1,008,763
Total multifamily	1,073,449				1,090				1,074,539			—			1,074,539
Home equity and lines of credit
Pass	54,800				135				54,935			—			54,935
Special Mention	360				—				360			—			360
Substandard	93				—				93			98			191
Total home equity and lines of credit	55,253				135				55,388			98			55,486
Commercial and industrial loans
Pass	11,331				90				11,421			—			11,421
Special Mention	652				—				652			—			652
Substandard	479				32				511			408			919
Total commercial and industrial loans	12,462				122				12,584			408			12,992
	December 31, 2014
	Performing (Accruing) Loans
	0-29 Days Past Due				30-89 Days Past Due				Total			Non-Performing Loans			Total Loans Receivable, net
Other loans
Pass	2,097				60				2,157			—			2,157
Total other loans	2,097				60				2,157			—			2,157
Total originated loans held-for-investment	1,607,816				10,830				1,618,646			13,848			1,632,494
Acquired loans:
One-to-four family residential
LTV < 60%
Pass	225,741				526				226,267			422			226,689
Special Mention	597				—				597			—			597
Substandard	424				—				424			313			737
Total	226,762				526				227,288			735			228,023
LTV =t; 60%
Pass	5,787				375				6,162			—			6,162
Substandard	294				—				294			—			294
Total	6,081				375				6,456			—			6,456
Total one-to-four family residential	232,843				901				233,744			735			234,479
Commercial
LTV < 35%
Pass	2,477				—				2,477			—			2,477
Special Mention	187				521				708			—			708
Total	2,664				521				3,185			—			3,185
LTV =t; 35%
Pass	5,817				—				5,817			—			5,817
Substandard	2,997				—				2,997			—			2,997
Total	8,814				—				8,814			—			8,814
Total commercial	11,478				521				11,999			—			11,999
Construction and land
Substandard	363				—				363			—			363
Total construction and land	363				—				363			—			363
Multifamily
LTV < 35%
Pass	4,857				—				4,857			—			4,857
Special Mention	164				—				164			—			164
Total	5,021				—				5,021			—			5,021
LTV =t; 35%
Pass	13,457				—				13,457			—			13,457
Special Mention	366				—				366			—			366
Total	13,823				—				13,823			—			13,823
Total multifamily	18,844				—				18,844			—			18,844
Total loans acquired	263,528				1,422				264,950			735			265,685
	$	1,871,344			$	12,252			$	1,883,596		$	14,583		$	1,898,179
	December 31, 2013
	Performing (Accruing) Loans
	0-29 Days Past Due				30-89 Days Past Due				Total			Non-Performing Loans			Total Loans Receivable, net
Loans held-for-investment:
Real estate loans:
Commercial
LTV < 35%
Pass	$	42,995			$	—			$	42,995		$	—		$	42,995
Special Mention	1,304				—				1,304			—			1,304
Substandard	1,333				—				1,333			—			1,333
Total	45,632				—				45,632			—			45,632
LTV =t; 35%
Pass	239,544				928				240,472			—			240,472
Special Mention	10,927				1,676				12,603			335			12,938
Substandard	28,949				680				29,629			11,863			41,492
Total	279,420				3,284				282,704			12,198			294,902
Total commercial	325,052				3,284				328,336			12,198			340,534
One-to-four family residential
LTV < 60%
Pass	28,216				379				28,595			—			28,595
Special Mention	1,746				413				2,159			130			2,289
Substandard	269				515				784			604			1,388
Total	30,231				1,307				31,538			734			32,272
LTV =t; 60%
Pass	27,575				2,666				30,241			—			30,241
Special Mention	703				—				703			—			703
Substandard	522				369				891			1,182			2,073
Total	28,800				3,035				31,835			1,182			33,017
Total one-to-four family residential	59,031				4,342				63,373			1,916			65,289
Construction and land
Pass	13,458				—				13,458			—			13,458
Special Mention	595				—				595			—			595
Substandard	—				—				—			108			108
Total construction and land	14,053				—				14,053			108			14,161
Multifamily
LTV < 35%
Pass	40,638				328				40,966			—			40,966
Special Mention	94				215				309			—			309
Substandard	821				—				821			—			821
Total	41,553				543				42,096			—			42,096
LTV =t; 35%
Pass	817,923				—				817,923			—			817,923
Special Mention	6,751				1,115				7,866			—			7,866
Substandard	4,118				825				4,943			73			5,016
Total	828,792				1,940				830,732			73			830,805
Total multifamily	870,345				2,483				872,828			73			872,901
Home equity and lines of credit
Pass	45,116				1				45,117			—			45,117
Special Mention	376				93				469			—			469
Substandard	—				—				—			1,239			1,239
Total home equity and lines of credit	45,492				94				45,586			1,239			46,825
Commercial and industrial loans
Pass	7,415				73				7,488			—			7,488
Special Mention	962				—				962			—			962
Substandard	570				741				1,311			441			1,752
Total Commercial and industrial loans	8,947				814				9,761			441			10,202
	December 31, 2013
	Performing (Accruing) Loans
	0-29 Days Past Due				30-89 Days Past Due				Total			Non-Performing Loans			Total Loans Receivable, net
Other loans
Pass	2,226				21				2,247			32			2,279
Total other loans	2,226				21				2,247			32			2,279
Total originated loans held-for-investment	$	1,325,146			$	11,038			$	1,336,184		$	16,007		$	1,352,191
Loans acquired:
One-to-four family residential
LTV < 60%
Pass	43,112				1,195				44,307			—			44,307
Special Mention	306				104				410			—			410
Substandard	136				4				140			—			140
Total	43,554				1,303				44,857			—			44,857
LTV =t; 60%
Pass	13,838				—				13,838			—			13,838
Special Mention	232				—				232			—			232
Substandard	262				—				262			1,073			1,335
Total	14,332				—				14,332			1,073			15,405
Total one-to-four family residential	57,886				1,303				59,189			1,073			60,262
Commercial
LTV < 35%
Pass	$	2,143			$	—			2,143			$	—		2,143
Special Mention	189				—				189			—			189
Substandard	937				529				1,466			—			1,466
Total	3,269				529				3,798			—			3,798
LTV =t; 35%
Pass	8,742				461				9,203			—			9,203
Substandard	—				—				—			252			252
Total	8,742				461				9,203			252			9,455
Total commercial	12,011				990				13,001			252			13,253
Construction and land
Substandard	372				—				372			—			372
Total construction and land	372				—				372			—			372
Multifamily
LTV < 35%
Pass	588				$	—			588			$	—		588
Substandard	490				—				490			—			490
Total	1,078				—				1,078			—			1,078
LTV =t; 35%
Pass	2,262				—				2,262			—			2,262
Special Mention	590				—				590			—			590
Total	2,852				—				2,852			—			2,852
Total multifamily	3,930				—				3,930			—			3,930
Total loans acquired	74,199				2,293				76,492			1,325			77,817
	$	1,399,345			$	13,331			$	1,412,676		$	17,332		$	1,430,008
The following table summarizes impaired loans as of December 31, 2014 and 2013 (in thousands):
	At December 31, 2014
	Recorded Investment				Unpaid Principal Balance				Related Allowance
With No Allowance Recorded:
Real estate loans:
Commercial
LTV =t; 35%
Pass	3,311				3,448				—
Substandard	12,880				14,339				—
One-to-four family residential
LTV < 60%
Special Mention	138				138
Substandard	262				262				—
Multifamily
LTV =t; 35%
Pass	86				557				—
Substandard	477				477				—
Home Equity
Special Mention	49				49
Commercial and industrial loans
Special Mention	267				268				—
Substandard	99				99				—
With a Related Allowance Recorded:
Real estate loans:
Commercial
LTV =t; 35%
Substandard	13,033				14,365				(2,361		)
One-to-four family residential
LTV =t; 60%
Special Mention	319				319				(4		)
Substandard	353				353				(53		)
Multifamily
LTV =t; 35%
Substandard	1,427				1,427				(215		)
Home equity and lines of credit
Special Mention	278				278				(13		)
Commercial and industrial loans
Special Mention	32				32				(1		)
Substandard	408				530				(108		)
Total:
Real estate loans
Commercial	29,224				32,152				(2,361		)
One-to-four family residential	1,072				1,072				(57		)
Multifamily	1,990				2,461				(215		)
Home equity and lines of credit	327				327				(13		)
Commercial and industrial loans	806				$	929			(109		)
	$	33,419			$	36,941			$	(2,755	)
	At December 31, 2013
	Recorded Investment				Unpaid Principal Balance				Related Allowance
With No Allowance Recorded:
Real estate loans:
Commercial
LTV < 35%
Pass	$	3,405			$	3,542			$	—
Substandard	—				707				—
LTV =t; 35%
Pass	19,689				21,382				—
Construction and land
Substandard	108				91				—
One-to-four family residential
LTV < 60%
Special Mention	507				507				—
Substandard	269				269				—
Multifamily
LTV < 35%
Substandard	593				1,064				—
Commercial and industrial loans
Special Mention	210				219				—
Substandard	853				1,008				—
With a Related Allowance Recorded:
Real estate loans:
Commercial
LTV =t; 35%
Special Mention	2,289				2,672				(52		)
Substandard	6,810				6,937				(2,333		)
One-to-four family residential
LTV =t; 60%
Substandard	340				340				(19		)
Multifamily
LTV =t; 35%
Substandard	1,481				1,481				(117		)
Home equity and lines of credit
Special Mention	342				342				(7		)
Substandard	1,000				1,395				—
Commercial and industrial loans
Substandard	441				485				(104		)
Total:
Real estate loans
Commercial	32,193				35,240				(2,385		)
One-to-four family residential	1,116				1,116				(19		)
Construction and land	108				91				—
Multifamily	2,074				2,545				(117		)
Home equity and lines of credit	1,342				1,737				(7		)
Commercial and industrial loans	1,504				1,712				(104		)
	$	38,337			$	42,441			$	(2,632	)
Included in the table above at December 31, 2014, are impaired loans with carrying balances of $13.1 million that were not written down by charge-offs or for which there are no specific reserves in our allowance for loan losses.  Included in the impaired loans at December 31, 2013, are loans with carrying balances of $21.8 million that were not written down by charge-offs or for which there are no specific reserves in our allowance for loan losses.  Loans not written down by charge-offs or specific reserves at December 31, 2014 and 2013, have sufficient collateral values, less costs to sell (including any discounts to facilitate a sale), or sufficient future cash flows to support the carrying balances of the loans.
The average recorded balance of originated impaired loans (including held-for-investment and held-for-sale) for the years ended December 31, 2014, 2013, and 2012 was approximately $34.3 million, $43.9 million, and $54.3 million, respectively.  The Company recorded $2.7 million, $2.0 million, and $2.8 million of interest income on impaired loans for the years ended December 31, 2014, 2013, and 2012, respectively.
The following tables summarize loans that were modified in a troubled debt restructuring during the years ended December 31, 2014 and 2013:
	Year Ended December 31, 2014
			Pre-Modification				Post-Modification
	Number of		Outstanding Recorded				Outstanding Recorded
	Relationships		Investment				Investment
	(in thousands)
One-to-four Family
Substandard	2		$	556			$	556
Total Troubled Debt Restructurings	2		$	556			$	556
Both of the relationships in the table above were restructured to receive reduced interest rates.
	Year Ended December 31, 2013
			Pre-Modification				Post-Modification
	Number of		Outstanding Recorded				Outstanding Recorded
	Relationships		Investment				Investment
	(in thousands)
One-to-four Family
Pass	1		$	70			$	70
Special Mention	1		331				331
Substandard	2		606				606
Total Troubled Debt Restructurings	4		$	1,007			$	1,007
All four of the relationships in the table above were restructured to receive reduced interest rates.
At December 31, 2014 and 2013, we had troubled debt restructurings of $33.8 million and $36.8 million, respectively.
Management classifies all troubled debt restructurings as impaired loans.  Impaired loans are individually assessed to determine that the loan’s carrying value is not in excess of the estimated fair value of the collateral (less cost to sell), if the loan is collateral dependent, or the present value of the expected future cash flows, if the loan is not collateral dependent. Management performs a detailed evaluation of each impaired loan and generally obtains updated appraisals as part of the evaluation.  In addition, management adjusts estimated fair values down to appropriately consider recent market conditions, our willingness to accept a lower sales price to effect a quick sale, and costs to dispose of any supporting collateral.  Determining the estimated fair value of underlying collateral (and related costs to sell) can be difficult in illiquid real estate markets and is subject to significant assumptions and estimates.  Management employs an independent third-party expert in appraisal preparation and review to ascertain the reasonableness of updated appraisals.  Projecting the expected cash flows under troubled debt restructurings which are not collateral dependent is inherently subjective and requires, among other things, an evaluation of the borrower’s current and projected financial condition. Actual results may be significantly different than our projections and our established allowance for loan losses on these loans, which could have a material effect on our financial results.
There were no loans that were restructured during the twelve months ended December 31, 2014, that subsequently defaulted.
There were four loans to one borrower that were restructured during the twelve months ended December 31, 2013, that subsequently defaulted. The following table details these loans at December 31, 2013:
	Year Ended December 31, 2013
	Number of		30-89 Days				90 Days or More
	Relationships		Past Due				Past Due
	(in thousands)
Commercial & Industrial
Substandard - non-accrual	1		$	—			$	441
Total	1		—				441
CRE
Substandard - non-accrual	3		—				7,052
Total	3		—				7,052
Total	4		$	—			$	7,493

Premises_And_Equipment_Net

Premises And Equipment, Net	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Premises And Equipment, Net	Premises and Equipment, Net
	At December 31, 2014 and 2013, premises and equipment, less accumulated depreciation and amortization, consists of the following (in thousands):
		December 31,
		2014			2013
	At cost:
	Land	$	2,026		$	2,026
	Buildings and improvements	6,691			6,647
	Capital leases	2,600			2,600
	Furniture, fixtures, and equipment	19,658			18,969
	Leasehold improvements	26,202			26,126
		57,177			56,368
	Accumulated depreciation and amortization	(30,951		)	(27,311		)
	Premises and equipment, net	$	26,226		$	29,057
	Depreciation expense for the years ended December 31, 2014, 2013, and 2012, was $3.6 million, $3.6 million, and $2.8 million, respectively.
	There were no sales of premises and equipment in 2014 or 2012. The Company realized a gain of $397,000 from the sale of vacant land adjacent to a branch in 2013.

Deposits

Deposits	12 Months Ended
	Dec. 31, 2014
Banking and Thrift [Abstract]
Deposits	Deposits
	Deposit account balances are summarized as follows (dollars in thousands):
		December 31,
		2014				2013
		Amount		Weighted Average Rate		Amount			Weighted Average Rate
	Transaction:
	Negotiable orders of withdrawal	$	124,961	0.34	%	$	129,955		0.31	%
	Non-interest bearing checking	269,466		—		235,355			—
	Total transaction	394,427		0.11		365,310			0.11
	Savings:
	Money market	440,887		0.38		438,562			0.25
	Savings	432,207		0.31		380,915			0.1
	Total savings	873,094		0.35		819,477			0.18
	Certificates of deposit:
	Under $100,000	211,543		0.92		172,175			0.83
	$100,000 or more	141,601		1.4		135,727			1.39
	Total certificates of deposit	353,144		1.11		307,902			1.08
	Total deposits	$	1,620,665	0.46	%	$	1,492,689		0.35	%
	The Company had brokered deposits (included in certificates of deposit in the above table) of $40.9 million and $695,000,  at December 31, 2014 and 2013, respectively.
	Scheduled maturities of certificates of deposit are summarized as follows (in thousands):
		December 31, 2014
	2015	$	203,288
	2016	43,439
	2017	36,909
	2018	5,116
	2019	64,284
	Thereafter	108
	Total	$	353,144
	Interest expense on deposits is summarized as follows (in thousands):
		December 31,
		2014		2013			2012
	Negotiable order of withdrawal and money market	$	1,766	$	1,956		$	3,226
	Savings-passbook and statement	445		679			910
	Certificates of deposit	3,180		3,866			5,701
		$	5,391	$	6,501		$	9,837

Borrowings

Borrowings	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Borrowings	Borrowings
	Borrowings consisted of securities sold under agreements to repurchase, FHLB advances, and obligations under capital leases and are summarized as follows (in thousands):
		December 31,
		2014		2013
	Repurchase agreements	$	203,200	$	181,000
	Other borrowings:
	FHLB advances	572,493		285,661
	Floating rate advances	2,058		2,485
	Obligations under capital leases	907		1,179
		$	778,658	$	470,325
	FHLB advances are secured by a blanket lien on unencumbered securities and the Company’s FHLB capital stock.
	Repurchase agreements and FHLB advances have contractual maturities as follows (in thousands):
		December 31, 2014
		FHLB		Repurchase
		Advances		Agreements
	2015	$	215,363	$	140,200
	2016	53,910		55,000
	2017	129,003		6,000
	2018	140,715		2,000
	2019	33,502		—
		$	572,493	$	203,200
	At  December 31, 2014, repurchase agreements have a weighted average rate of 1.69%, with $109.2 million maturing in the in the first quarter of 2015 and $94.0 million maturing in more than 90 days.  The repurchase agreements are secured primarily by mortgage-backed securities with an amortized cost of $213.9 million, and a fair value of $218.3 million, at December 31, 2014.  At  December 31, 2013, repurchase agreements had a weighted average rate of 2.70%, with the exception of one repurchase agreement that matured late in the first quarter of 2014 at a rate of 2.92%, all maturing in more than 90 days.  The repurchase agreements were secured primarily by mortgage-backed securities with an amortized cost of $192.7 million, and a fair value of $197.9 million, at December 31, 2013.
	The Company has the ability to obtain additional funding from the FHLB and Federal Reserve Bank discount window of approximately $291.3 million, utilizing unencumbered and unpledged securities of $90.6 million and multifamily loans of $229.8 million at December 31, 2014.  The Company expects to have sufficient funds available to meet current commitments in the normal course of business.
	Interest expense on borrowings is summarized as follows (in thousands):
		December 31,
		2014		2013		2012
	Repurchase agreements	$	4,161	$	6,492	$	8,573
	FHLB advances	5,717		3,836		4,071
	Floating rate advances	3		10		27
	Obligations under capital leases	80		109		136
		$	9,961	$	10,447	$	12,807

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes
	Income tax expense (benefit) consists of the following (in thousands):
		December 31,
		2014			2013			2012
	Federal tax expense (benefit):
	Current	$	11,195		$	12,493		$	10,081
	Deferred	(1,675		)	(2,758		)	(1,876		)
		9,520			9,735			8,205
	State and local tax expense (benefit):
	Current	1,828			2,276			1,568
	Deferred	508			(1,275		)	(857		)
		2,336			1,001			711
	Total income tax expense	$	11,856		$	10,736		$	8,916
	The Company recorded net deferred tax assets of approximately $1.6 million as a result of the acquisition of Flatbush Federal Bancorp at December 31, 2012.
	Reconciliation between the amount of reported total income tax expense and the amount computed by multiplying the applicable statutory income tax rate for the years ended December 31, 2014, 2013, and 2012, is as follows (dollars in thousands):
		December 31,
		2014			2013			2012
	Tax expense at statutory rate of 35%	$	11,242		$	10,459		$	8,731
	Increase (decrease) in taxes resulting from:
	State tax, net of federal income tax	1,519			651			462
	Bank owned life insurance	(1,366		)	(1,262		)	(1,009		)
	Merger related costs	—			—			207
	Incentive stock options	134			149			149
	Uncertain tax position	131			448			231
	Other, net	196			291			145
	Income tax expense	$	11,856		$	10,736		$	8,916
	The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities at December 31, 2014 and 2013, are as follows (in thousands):
		December 31,
		2014			2013
	Deferred tax assets:
	Allowance for loan losses	$	10,302		$	10,387
	Capitalized leases	369			492
	Deferred compensation	2,577			2,500
	Accrued salaries	950			737
	Postretirement benefits	523			539
	Equity awards	2,930			2,686
	Unrealized actuarial losses on post retirement benefits	226			—
	Straight-line leases adjustment	1,083			1,032
	Asset retirement obligation	100			102
	Reserve for accrued interest receivable	1,220			1,233
	Reserve for loan commitments	184			180
	Employee Stock Ownership Plan	308			241
	Other	398			493
	Depreciation	1,616			1,259
	Fair value adjustments of acquired loans	6,247			5,381
	Fair value adjustments of pension benefit obligations	306			172
	Unrealized losses securities	291			3,556
	Total gross deferred tax assets	29,630			30,990
	Deferred tax liabilities:
	Employee Stock Ownership Plan	—			—
	Unrealized actuarial gains on post retirement benefits	—			478
	Fair value adjustments of acquired securities	13			17
	Fair value adjustments of deposit liabilities	27			45
	Deferred loan fees	1,639			1,105
	Total gross deferred tax liabilities	1,679			1,645
	Net deferred tax asset	$	27,951		$	29,345
	The Company has determined that it is not required to establish a valuation reserve for the remaining net deferred tax asset account since it is “more likely than not” that the net deferred tax assets will be realized through future reversals of existing taxable temporary differences, future taxable income and tax planning strategies.  The conclusion that it is “more likely than not” that the remaining net deferred tax assets will be realized is based on the history of earnings and the prospects for continued profitability.  Management will continue to review the tax criteria related to the recognition of deferred tax assets.
	As a savings institution, the Bank is subject to a special federal tax provision regarding its frozen tax bad debt reserve. At December 31, 2014, and December 31, 2013, the Bank’s federal tax bad debt base-year reserve was $5.9 million, with a related net deferred tax liability of $2.8 million, which has not been recognized since the Bank does not expect that this reserve will become taxable in the foreseeable future. Events that would result in taxation of this reserve include redemptions of the Bank’s stock or certain excess distributions by the Bank to the Company.
	A reconciliation of the Company’s uncertain tax positions are as follows (in thousands):
		December 31,
		2014			2013			2012
	Beginning balance	$	679		$	231		$	—
	Settlements based on tax positions related to prior years	(580		)	—			—
	Additions based on tax positions related to prior years	131			448			231
Ending balance	$	230		$	679		$	231
The Company recognizes interest and penalties on income taxes in income tax expense.
The following years are open for examination or under examination:
•	Federal tax filings for 2011 through present.
•	New York State tax filings 2010 through present. The 2010 and 2011 filings are currently under examination.
•	New York City tax filings 2010 through present. The 2010 and 2011 filings are currently under examination.
•	State of New Jersey 2010 through present.

Retirement_Benefits

Retirement Benefits	12 Months Ended
	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Retirement Benefits	Retirement Benefits
	The Company has a 401(k) plan for its employees, which grants eligible employees (those salaried employees with at least three months of service) the opportunity to invest from 2% to 15% of their base compensation in certain investment alternatives.  The Company contributes an amount equal to 25% of employee contributions on the first 6% of base compensation contributed by eligible employees for the first three years of participation.  Subsequent years of participation in excess of three years will increase the Company matching contribution from 25% to 50% of an employee’s contributions, on the first 6% of base compensation contributed by eligible employees.  A member becomes fully vested in the Company’s contributions upon (a) completion of five years of service, or (b) normal retirement, early retirement, permanent disability, or death.  The Company’s contribution to this plan amounted to approximately $292,000,  $266,000, and $226,000 for the years ended December 31, 2014, 2013, and 2012, respectively.
	The Company also maintains a profit‑sharing plan in which the Company can contribute to the participant’s 401(k) account, at its discretion, up to the legal limit of the Internal Revenue Code.  The Company did not contribute to the profit sharing plan during 2014, 2013, and 2012.
	The Company maintains the Northfield Bank Employee Stock Ownership Plan (the ESOP).  The ESOP is a tax-qualified plan designed to invest primarily in the Company’s common stock.  The ESOP provides employees with the opportunity to receive a funded retirement benefit from the Bank, based primarily on the value of the Company’s common stock.  The ESOP was authorized to, and did purchase, 2,463,884 shares of the Company’s common stock in the Company’s initial public offering at a price of $7.13 per share.  This purchase was funded with a loan from Northfield Bancorp, Inc. to the ESOP.  The outstanding balance at December 31, 2014 and 2013, was $13.3 million and $13.9 million, respectively.  The shares of the Company’s common stock purchased in the initial public offering are pledged as collateral for the loan.  Shares are released for allocation to participants as loan payments are made.  A total of 80,728 and 81,631 shares were released and allocated to participants for the ESOP years ended December 31, 2014 and 2013, respectively.  Cash dividends on unallocated shares are utilized to satisfy required debt payments.  Dividends on allocated shares are utilized to prepay debt which releases additional shares to participants.
	Upon completion of the Company’s second-step conversion, a second ESOP was offered to employees in 2013; the second ESOP was authorized to, and did purchase, 1,422,357 shares of the Company’s common stock at a price of $10.00 per share.  The purchase was funded with a loan from Northfield Bancorp, Inc. to the second ESOP.  The outstanding balance at December 31, 2014 and 2013, was $13.6 million and $13.9 million, respectively.  The shares of the Company’s common stock purchased in the second-step conversion are pledged as collateral for the loan.  Shares are released for allocation to participants as loan payments are made.  A total of 47,412 shares were released and allocated to participants for each of the second ESOP years ended December 31, 2014 and 2013.  Cash dividends on unallocated shares are utilized to satisfy required debt payments.  Dividends on allocated shares are utilized to prepay debt which releases additional shares to participants.
	ESOP compensation expense for both plans for the years ended December 31, 2014, 2013, and 2012 was $1.7 million,  $1.5 million, and $856,000, respectively.
	The Company maintains a Supplemental Employee Stock Ownership Plan (the SESOP), a non-qualified plan, that provides supplemental benefits to certain executives who are prevented from receiving the full benefits contemplated by the ESOP’s benefit formula due to tax law limits for tax-qualified plans.  The supplemental payments for the SESOP consist of cash payments representing the value of Company shares that cannot be allocated to participants under the ESOP due to legal limitations imposed on tax-qualified plans.  The Company's required contributions to the SESOP plan were $7,000, $38,000, and $25,000 for the years ended December 31, 2014, 2013, and 2012, respectively.
	The Company provides post retirement medical and life insurance to a limited number of retired individuals.  The Company also provides retiree life insurance benefits to all qualified employees, up to certain limits.  The following tables set forth the funded status and components of postretirement benefit costs at December 31 measurement dates (in thousands):
		2014				2013				2012
	Accumulated postretirement benefit obligation beginning of year	$	1,294			$	1,778			$	1,697
	Service cost	6				9				7
	Interest cost	53				56				66
	Actuarial loss (gain)	578				(455		)		115
	Benefits paid	(85		)		(94		)		(107		)
	Accumulated postretirement benefit obligation end of year	1,846				1,294				1,778
	Accrued liability (included in accrued expenses and other liabilities)	$	1,846			$	1,294			$	1,778
	The following table sets forth the amounts recognized in accumulated other comprehensive income (loss) (in thousands):
		December 31,
		2014				2013
	Net loss (gain)	$	473			$	(116	)
	Transition obligation	17				33
	Prior service cost	50				74
	Loss (gain) recognized in accumulated other comprehensive income	$	540			$	(9	)
	The estimated net loss, transition obligation, and prior service cost that will be amortized from accumulated other comprehensive income (loss) into net periodic cost in 2015, are $44,000,  $17,000, and $38,000 respectively.
	The following table sets forth the components of net periodic postretirement benefit costs for the years ended December 31, 2014, 2013, and 2012 (in thousands):
		December 31,
		2014				2013				2012
	Service cost	$	6			$	9			$	7
	Interest cost	53				56				66
	Amortization of transition obligation	17				17				17
	Amortization of prior service costs	24				16				15
	Amortization of unrecognized (gain) loss	(11		)		36				28
	Net postretirement benefit cost included in compensation and employee benefits	$	89			$	134			$	133
	The assumed discount rate related to plan obligations reflects the weighted average of published market rates for high-quality corporate bonds with terms similar to those of the plans expected benefit payments, rounded to the nearest quarter percentage point.  The Company’s discount rate and rate of compensation increase used in accounting for the plan are as follows:
		2014			2013			2012
	Assumptions used to determine benefit obligation at period end:
	Discount rate	3.5	%		4.25	%		3.25	%
	Rate of increase in compensation	4	%		4	%		4	%
	Assumptions used to determine net periodic benefit cost for the year:
	Discount rate	4.25	%		3.25	%		4	%
	Rate of increase in compensation	4	%		4	%		4	%
	At December 31, 2014, a medical cost trend rate of 8.75% decreasing 0.50% per year thereafter until an ultimate rate of 4.75% is reached, was used in the plan’s valuation.  The Company’s healthcare cost trend rates are based, among other things, on the Company’s own experience and third-party analysis of recent and projected healthcare cost trends.
	A one percentage-point change in assumed heath care cost trends would have the following effects (in thousands):
		One Percentage Point Increase								One Percentage Point Decrease
		2014				2013				2014			2013
	Effect on benefits earned and interest cost	$	4			$	5			$	(3	)	$	(4	)
	Effect on accumulated postretirement benefit obligation	153				89				(135		)	(80		)
	A one percentage-point change in assumed heath care cost trends would have the following effects (in thousands):
		One Percentage Point Increase											One Percentage Point Decrease
		2014				2013				2012			2014			2013			2012
	Aggregate of service and interest	$	4			$	5			$	6		$	(3	)	$	(4	)	$	(5	)
	components of net periodic cost (benefit)
	Benefit payments of approximately $85,000, $94,000, and $107,000 were made in 2014, 2013, and 2012, respectively. The benefits expected to be paid under the postretirement health benefits plan for the next five years are as follows:  $112,000 in 2015;  $116,000 in 2016;  $120,000 in 2017;  $122,000 in 2018; and $125,000 in 2019.  The benefit payments expected to be paid in the aggregate for the years 2020 through 2024 are $638,000.  The expected benefits are based on the same assumptions used to measure the Company’s benefit obligation at December 31, 2014, and include estimated future employee service.
	The Company also maintained a defined benefit pension plan covering certain employees and individuals from the Merger, which was terminated in February 2014, and resulted in the Company recognizing a pre-tax gain of $937,000.
	The following tables set forth the defined benefit pension plan's funded status and components of postretirement benefit costs at December 31, 2013, measurement dates (in thousands):
		2013
	Accumulated postretirement benefit obligation beginning of year	$	7,646
	Interest cost	225
	Actuarial gain	(1,261		)
	Benefits paid	(247		)
	Accumulated postretirement benefit obligation end of year	6,363
	Plan assets at fair value	6,763
	Net asset	$	400
	The following table sets forth the amounts recognized in accumulated other comprehensive income (loss) (in thousands):
	2013
Net gain recognized in accumulated other comprehensive income	$	(1,143	)
The following table sets forth the components of net periodic postretirement benefit costs (in thousands):
	2013
Interest cost	225
Expected return on assets	(207		)
Net postretirement benefit cost included in compensation and employee benefits	$	18
The assumed discount rate related to plan obligations reflects the weighted average of published market rates for high-quality corporate bonds with terms similar to those of the plans expected benefit payments, rounded to the nearest quarter percentage point.  Additionally, the assumed long-term rate-of-return-on-assets reflects historical returns earned on equities and fixed income securities, adjusted to reflect expectations of future returns as applied to the plan’s target allocation of asset classes.  The Company’s discount rate, long-term rate-of-return on plan assets, and amortization period are as follows:
	2013
Assumptions used to determine benefit obligation at period end:
Discount rate	3.75	%
Assumptions used to determine net periodic benefit cost for the year:
Discount rate	3	%
Long term rate of return on plan assets	3	%
Amortization period	8.09
The fair values of the defined benefit pension plan’s assets by asset category are as follows:
	Fair Value Measurements at December 31, 2013 Using:
	Carrying Value				Quoted Prices in Active Markets for Identical Assets (Level 1)				Significant Other Observable			Significant Unobservable
									Inputs        (Level 2)			Inputs        (Level 3)
	(in thousands)
Assets measured on a recurring basis:
Common / Collective Trusts - Fixed Income
Market Duration Fixed (a)	$	1,167			$	—			$	1,167		$	—
Mutual Funds - Fixed Income
Intermediate Duration (b)	2,354				2,354				—			—
Cash Equivalents - Money market	3,242				3,242				—			$	—
Total	$	6,763			$	5,596			$	1,167		$	—
(a)	This category consists of an index fund that tracks the Barclays Capital U.S. Aggregate Bond Index. The fund invests in Treasury, agency, corporate, mortgage-backed and asset-backed securities.
(b)	This category consists of two funds, one containing a diversified portfolio of high-quality bonds and other fixed income securities, including U.S. Government obligations, mortgage-related and asset-backed securities, corporate and municipal bonds, CMO's, and other securities rated Baa or better. The second fund emphasizes a more globally diversified portfolio of higher-quality, intermediate-term bonds.
The Company maintains a nonqualified plan to provide for the elective deferral of all or a portion of director fees by members of the participating board of directors, deferral of all or a portion of the compensation and/or annual incentive compensation payable to eligible employees of the Company, and to provide to certain officers of the Company benefits in excess of those permitted to be paid by the Company’s savings plan, ESOP, and profit‑sharing plan under the applicable Internal Revenue Code.  The plan obligation was approximately $6.5 million and $6.0 million at December 31, 2014 and 2013, respectively, and is included in accrued expenses and other liabilities on the consolidated balance sheets.  Income under this plan was $153,000 for the year ended December 31, 2014. Expense under this plan was $963,000, and $384,000 for the years ended December 31, 2013 and 2012, respectively.  The Company invests to fund this future obligation, in various mutual funds designated as trading securities.  The securities are marked-to-market through current period earnings as a component of non-interest income.  Accrued obligations under this plan are credited or charged with the return on the trading securities portfolio as a component of compensation and benefits expense.
The Company entered into a supplemental retirement agreement with its former president and director in 2006.  The agreement provides for 120 monthly payments of $17,450.  The present value of the obligation, of approximately $1,625,000, was recorded in compensation and benefits expense in 2006.  The present value of the obligation as of December 31, 2014 and 2013, was approximately $350,000 and $536,000,  respectively.

Equity_Incentive_Plan

Equity Incentive Plan	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Equity Incentive Plan	Equity Incentive Plan
	In 2014, the Company granted to directors and employees a total of 1,001,200 restricted shares, and 2,502,600 stock options to purchase Company stock. These shares and options were issued out of the 2014 Equity Incentive Plan ("2014 EIP"), which allows the Company to grant common stock or options to purchase common stock at specific prices to directors and employees of the Company. The 2014 EIP provides for the issuance or delivery of up to 4,978,249 shares (1,422,357 restricted shares and 3,555,892 stock options) of Northfield Bancorp, Inc. common stock subject to certain plan limitations.
	All stock options and restricted stock granted to date vest in equal installments over a five-year period beginning one year from the date of grant. The vesting of options and restricted stock awards may accelerate in accordance with terms of the 2014 EIP. Stock options were granted at an exercise price equal to the fair value of the Company’s common stock on the grant date based on quoted market prices and all have an expiration period of ten years. The fair value of stock options granted on June 11, 2014, was estimated utilizing the Black-Scholes option pricing model using the following assumptions: an expected life of 6.5 years, risk-free rate of return of 1.92%, volatility of 33.83% and a dividend yield of 1.83%. The fair value of stock options granted on December 8, 2014, was estimated utilizing the Black-Scholes option pricing model using the following assumptions: an expected life of 6.5 years, risk-free rate of return of 1.81%, volatility of 32.92% and a dividend yield of 1.68%.
	The Company also maintains the Northfield Bancorp, Inc. 2008 Equity Incentive Plan ("2008 EIP") to grant common stock or options to purchase common stock at specific prices to directors and employees of the Company.  The 2008 EIP provides for the issuance or delivery of up to 4,311,796 shares of Northfield Bancorp, Inc. common stock subject to certain plan limitations. 211,530 shares of stock remain available for issuance under the 2008 EIP as of December 31, 2014.    All stock options and restricted stock granted to date vest in equal installments over a five-year period beginning one year from the date of grant.   The vesting of options and restricted stock awards may accelerate in accordance with terms of the 2008 EIP.  Stock options were granted at an exercise price equal to the fair value of the Company’s common stock on the grant date based on quoted market prices and all have an expiration period of ten years.  The fair value of stock options granted on January 30, 2009, was estimated utilizing the Black-Scholes option pricing model using the following assumptions: an expected life of 6.5 years utilizing the simplified method, risk-free rate of return of 2.17%, volatility of 35.33% and a dividend yield of 1.61%.   The fair value of stock options granted on May 29, 2009, was estimated utilizing the Black-Scholes option pricing model using the following assumptions: an expected life of 6.5 years utilizing the simplified method, risk-free rate of return of 2.88%, volatility of 38.39% and a dividend yield of 1.50%.  The fair value of stock options granted on January 30, 2010, was estimated utilizing the Black-Scholes option pricing model using the following assumptions: an expected life of 6.5 years utilizing the simplified method, risk-free rate of return of 2.90%, volatility of 38.29% and a dividend yield of 1.81%.  The fair value of stock options granted on July 26, 2013, was estimated utilizing the Black-Scholes option pricing model using the following assumptions: an expected life of 6.5 years utilizing the simplified method, risk-free rate of return of 1.39%, volatility of 35.33% and a dividend yield of 1.98%.  The Company is expensing the grant date fair value of all employee and director share-based compensation over the requisite service periods on a straight-line basis.
	During the years ended December 31, 2014, 2013, and 2012, the Company recorded,  $2.8 million,  $3.2 million and $3.0 million of stock-based compensation.
	The following table is a summary of the Company’s non-vested stock options as of December 31, 2014, and changes therein during the year then ended:
		Number of Stock Options		Weighted Average Grant Date Fair Value		Weighted Average Exercise Price		Weighted Average Contractual Life (years)
	Outstanding- December 31, 2012	2,805,912		$	2.3	$	7.09	6.07
	Granted	20,900		3.06		11.97		9.58
	Exercised	(26,507	)	2.3		7.09		—
	Outstanding- December 31, 2013	2,800,305		2.3		7.13		5.16
	Granted	2,502,600		3.91		13.13		9.45
	Forfeited	(18,000	)	3.91		13.13		—
	Exercised	(146,833	)	2.3		7.11		—
	Outstanding- December 31, 2014	5,138,072		3.08		10.04		7.44
	Exercisable- December 31, 2014	2,635,910		$	2.3	$	7.13	4.12
	Expected future stock option expense related to the non-vested options outstanding as of December 31, 2014, is $8.7 million over an average period of 4.4 years.
	The following is a summary of the status of the Company’s restricted shares as of December 31, 2014, and changes therein during the year then ended:
		Number of Shares Awarded		Weighted Average Grant Date Fair Value
	Non-vested at December 31, 2012	454,904		$	7.11
	Granted	13,300		11.97
	Vested	(225,595	)	7.1
	Forfeited	(2,526	)	7.09
	Non-vested at December 31, 2013	240,083		7.29
	Granted	1,001,200		13.13
	Vested	(228,209	)	7.16
	Forfeited	(10,000	)	13.13
	Non-vested at December 31, 2014	1,003,074		$	13.11
	Expected future stock award expense related to the non-vested restricted awards as of December 31, 2014, is $11.7 million over an average period of 4.5 years.
	Upon the exercise of stock options, management expects to utilize treasury stock as the source of issuance for these shares.

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, in the normal course of business, is party to commitments that involve, to varying degrees, elements of risk in excess of the amounts recognized in the consolidated financial statements.  These commitments include unused lines of credit and commitments to extend credit.
	At December 31, 2014 and 2013, the following commitment and contingent liabilities existed that are not reflected in the accompanying consolidated financial statements (in thousands):
		December 31,
		2014		2013
	Commitments to extend credit	$	72,438	$	61,277
	Unused lines of credit	60,598		46,080
	Standby letters of credit	420		604
	The Company’s maximum exposure to credit losses in the event of nonperformance by the other party to these commitments is represented by the contractual amount.  The Company uses the same credit policies in granting commitments and conditional obligations as it does for amounts recorded in the consolidated balance sheets.  These commitments and obligations do not necessarily represent future cash flow requirements.  The Company evaluates each customer’s creditworthiness on a case‑by‑case basis.  The amount of collateral obtained, if deemed necessary, is based on management’s assessment of risk.  Standby letters of credit are conditional commitments issued by the Company to guarantee the performance of a customer to a third-party.   The guarantees generally extend for a term of up to one year and are fully collateralized.  For each guarantee issued, if the customer defaults on a payment to the third-party, the Company would have to perform under the guarantee.  The unamortized fee on standby letters of credit approximates their fair value; such fees were insignificant at December 31, 2014, and at December 31, 2013.  The Company maintains an allowance for estimated losses on commitments to extend credit in other liabilities.   At December 31, 2014 and 2013, the allowance was $472,000 and $430,000,  respectively, changes to the allowance are recorded as a component of other non-interest expense.
	At December 31, 2014, the Company was obligated under non-cancelable operating leases and capitalized leases on property used for banking purposes.  Most leases contain escalation clauses and renewal options which provide for increased rentals as well as for increases in certain property costs including real estate taxes, common area maintenance, and insurance.
	The projected minimum annual rental payments and receipts under the capitalized leases and operating leases,  are as follows (in thousands):
		Rental Payments Capitalized Leases		Rental Payments Operating Leases
	Year ending December 31:
	2015	$	269	$	3,992
	2016	247		3,885
	2017	254		3,763
	2018	262		3,381
	2019	44		3,056
	Thereafter	—		27,985
	Total minimum lease payments	$	1,076	$	46,062
	Net rental expense included in occupancy expense was approximately $4.3 million, $4.2 million,  and $3.9 million for the years ended December 31, 2014, 2013, and 2012, respectively.
	In the normal course of business, the Company may be a party to various outstanding legal proceedings and claims.  In the opinion of management, the consolidated financial statements will not be materially affected by the outcome of such legal proceedings and claims.
	The Bank has entered into employment agreements with its Chief Executive Officer and the other executive officers of the Bank to ensure the continuity of executive leadership, to clarify the roles and responsibilities of executives, and to make explicit the terms and conditions of executive employment.  These agreements are for a term of three years subject to review and annual renewal, and provide for certain levels of base annual salary and in the event of a change in control, as defined, or in the event of termination, as defined, certain levels of base salary, bonus payments, and benefits for a period of up to three years.

Regulatory_Requirements

Regulatory Requirements	12 Months Ended
	Dec. 31, 2014
Regulatory Requirements [Abstract]
Regulatory Requirements	Regulatory Requirements
	The OCC requires savings institutions to maintain a minimum tangible capital ratio to tangible assets of 1.5%, a minimum core capital ratio to total adjusted assets of 4.0%, and a minimum ratio of total risk-adjusted total assets of 8.0%.
	Under  prompt corrective action regulations, the OCC is required to take certain supervisory actions (and may take additional discretionary actions) with respect to an undercapitalized institution.  Such actions could have a direct material effect on the institution’s financial statements.  The regulations establish a framework for the classification of savings institutions into five categories: well capitalized, adequately capitalized, undercapitalized, significantly undercapitalized, and critically undercapitalized.  Generally, an institution is considered well capitalized if it has a core capital ratio of at least 5%, a Tier 1 risk‑based capital ratio of at least 6%, and a total risk‑based capital ratio of at least 10%.
	The foregoing capital ratios are based in part on specific quantitative measures of assets, liabilities, and certain off‑balance‑sheet items as calculated under regulatory accounting practices.  Capital amounts and classifications also are subject to qualitative judgments by the regulators about capital components, risk weighting, and other factors.
	Management believes that as of December 31, 2014, and December 31, 2013, the Bank met all capital adequacy requirements to which it is subject.  Further, the most recent OCC notification categorized the Bank as a well‑capitalized institution under the prompt corrective action regulations.  There have been no conditions or events since that notification that management believes have changed the Bank’s capital classification.
	In July 2013, the federal banking agencies approved a new rule that substantially amended the regulatory risk-based capital rules applicable to the Bank. The final rule implements the “Basel III” regulatory capital reforms and changes required by the Dodd-Frank Act. The rule includes new minimum risk-based capital and leverage ratios, which were effective January 1, 2015, and refines the definition of what constitutes “capital” for purposes of calculating these ratios.  The new minimum capital requirements are: (i) a new common equity Tier 1 capital ratio of 4.5%; (ii) a Tier 1 to risk-based assets capital ratio of 6% (increased from 4%); (iii) a total capital ratio of 8% (unchanged from current rules); and (iv) a Tier 1 leverage ratio of 4%. The final rule also establishes a “capital conservation buffer” of 2.5%, and will result in the following minimum ratios: (i) a common equity Tier 1 capital ratio of 7.0%, (ii) a Tier 1 to risk-based assets capital ratio of 8.5%, and (iii) a total capital ratio of 10.5%. The new capital conservation buffer requirement will be phased in beginning in January 2016 at 0.625% of risk-weighted assets and will increase each year until fully implemented in January 2019.
	Northfield Bancorp, Inc. is regulated, supervised, and examined by the FRB as a savings and loan holding company and, as such, is not subject to regulatory capital requirements.  The Dodd-Frank Act will require the federal banking agencies to establish consolidated risk-based and leverage capital requirements for insured depository institutions, depository institution holding companies and systemically important nonbank financial companies.  These requirements must be no less than those to which insured depository institutions are currently subject.  As a result, on the fifth anniversary of the effective date of the Dodd-Frank Act, we will become subject to consolidated capital requirements which we have not been subject to previously.
	The following is a summary of the Bank’s regulatory capital amounts and ratios compared to the regulatory requirements as of December 31, 2014 and 2013, for classification as a well-capitalized institution and minimum capital (dollars in thousands):
		OCC Requirements
										For Well
						For Capital				Capitalized
						Adequacy				Under Prompt Corrective
		Actual				Purposes				Action Provisions
		Amount		Ratio		Amount		Ratio		Amount	Ratio
	As of December 31, 2014:
	Tangible capital to tangible assets	$	494,131	16.46	%	$	45,036	1.5	%	NA	NA
	Tier I capital (core) (to adjusted total assets)	494,131		16.46		120,096		4		150,119	5
	Total capital (to risk-weighted assets)	520,875		22.95		181,585		8		226,982	10
	As of December 31, 2013:
	Tangible capital to tangible assets	$	535,007	19.88	%	$	40,363	1.5	%	NA	NA
	Tier I capital (core) (to adjusted total assets)	535,007		19.88		107,635		4		134,544	5
	Total capital (to risk-weighted assets)	559,187		28.94		154,570		8		193,213	10

Fair_Value_Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value of Measurement
	The following table presents the assets reported on the consolidated balance sheet at their estimated fair value as of December 31, 2014 and 2013, by level within the Fair Value Measurements and Disclosures Topic of the FASB Accounting Standards Codification.  Financial assets and liabilities are classified in their entirety based on the level of input that is significant to the fair value measurement.  The fair value hierarchy is as follows:
	•	Level 1 Inputs – Unadjusted quoted prices in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date.
	•	Level 2 Inputs – Inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. These include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (for example, interest rates, volatilities, prepayment speeds, loss severities, credit risks and default rates) or inputs that are derived principally from or corroborated by observable market data by correlations or other means.
	•	Level 3 Inputs – Significant unobservable inputs that reflect the Company’s own assumptions that market participants would use in pricing the assets or liabilities.
	The following tables summarize financial assets and financial liabilities measured at fair value as of December 31, 2014 and 2013, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value (in thousands):
		Fair Value Measurements at December 31, 2014 Using:
		Carrying Value		Quoted Prices in Active Markets for Identical Assets (Level 1)			Significant Other Observable		Significant Unobservable
							Inputs        (Level 2)		Inputs
									(Level 3)
		(in thousands)
	Measured on a recurring basis:
	Assets:
	Investment securities:
	Available-for-sale:
	Mortgage-backed securities
	GSE	$	699,790	$	—		$	699,790	$	—
	Non-GSE	1,026		—			1,026		—
	Other securities
	Corporate bonds	70,013		—			70,013		—
	Equities	410		410			—		—
	Total available-for-sale	771,239		410			770,829		—
	Trading securities	6,422		6,422			—		—
	Total	$	777,661	$	6,832		$	770,829	$	—
	Measured on a non-recurring basis:
	Assets:
	Impaired loans:
	Real estate loans:
	Commercial real estate	$	17,438	$	—		$	—	$	17,438
	One-to-four family residential mortgage	672		—			—		672
	Multifamily	1,513		—			—		1,513
	Home equity and lines of credit	278		—			—		278
	Total impaired real estate loans	19,901		—			—		19,901
	Commercial and industrial loans	440		—			—		440
	Other real estate owned	752		—			—		752
	Total	$	21,093	$	—		$	—	$	21,093
		Fair Value Measurements at December 31, 2013 Using:
		Carrying Value		Quoted Prices in Active Markets for Identical Assets (Level 1)			Significant Other Observable		Significant Unobservable
							Inputs        (Level 2)		Inputs
									(Level 3)
		(in thousands)
	Measured on a recurring basis:
	Assets:
	Investment securities:
	Available-for-sale:
	Mortgage-backed securities
	GSE	$	855,571	$	—		$	855,571	$	—
	Non-GSE	4,552		—			4,552		—
	Other securities
	Corporate bonds	76,452		—			76,452		—
	Equities	510		510			—		—
	Total available-for-sale	937,085		510			936,575		—
	Trading securities	5,998		5,998			—		—
	Total	$	943,083	$	6,508		$	936,575	$	—
	Measured on a non-recurring basis:
	Assets:
	Impaired loans:
	Real estate loans:
	Commercial real estate	$	23,572	$	—		$	—	$	23,572
	One-to-four family residential mortgage	340		—			—		340
	Construction and land	109		—			—		109
	Multifamily	1,579		—			—		1,579
	Home equity and lines of credit	1,342		—			—		1,342
	Total impaired real estate loans	26,942		—			—		26,942
Commercial and industrial loans	616		—			—		616
Other real estate owned	634		—			—		634
Total	$	28,192	$	—		$	—	$	28,192
The following table presents qualitative information for Level 3 assets measured at fair value on a non-recurring basis at December 31, 2014:
	Fair Value		Valuation Methodology		Unobservable Inputs	Range of Inputs
	(in thousands)
Impaired loans	$	20,341	Appraisals		Discount for costs to sell	7.00%
					Discount for quick sale	10.0% - 40.0%
			Discounted cash flows		Interest rates	4.6% - 7.5%
Other real estate owned	$	752	Appraisals		Discount for costs to sell	7.00%
The following table presents qualitative information for Level 3 assets measured at fair value on a non-recurring basis at December 31, 2013:
	Fair Value		Valuation Methodology		Unobservable Inputs	Range of Inputs
	(in thousands)
Impaired loans	$	27,558	Appraisals		Discount for costs to sell	7.00%
					Discount for quick sale	10.0% - 25.0%
			Discounted cash flows		Interest rates	4.6% - 7.5%
Other real estate owned	$	634	Appraisals		Discount for costs to sell	7.00%
Available-for-Sale Securities: The estimated fair values for mortgage-backed securities, GSE bonds, and corporate securities are obtained from a nationally recognized third-party pricing service.  The estimated fair values are derived primarily from cash flow models, which include assumptions for interest rates, credit losses, and prepayment speeds.  Broker/dealer quotes are utilized as well when such quotes are available and deemed representative of the market.  The significant inputs utilized in the cash flow models are based on market data obtained from sources independent of the Company (observable inputs,) and are therefore classified as Level 2 within the fair value hierarchy.  The estimated fair value of equity securities classified as Level 1, are derived from quoted market prices in active markets.  Equity securities consist primarily of money market mutual funds.  There were no transfers of securities between Level 1 and Level 2 during the year ended December 31, 2014.
Trading Securities: Fair values are derived from quoted market prices in active markets.  The assets consist of publicly traded mutual funds.
Impaired Loans: At December 31, 2014, and December 31, 2013, the Company had originated impaired loans held-for-investment and held-for-sale with outstanding principal balances of $23.7 million and $31.7 million that were recorded at their estimated fair value of $20.3 million and $27.6 million, respectively.  The Company recorded impairment charges of $123,000 and $2.5 million for the years ended December 31, 2014 and 2013, respectively, and net charge-offs of $390,000 and $2.3 million for the years ended December 31, 2014 and 2013, respectively, utilizing Level 3 inputs.  For purposes of estimating fair value of impaired loans, management utilizes independent appraisals, if the loan is collateral dependent, adjusted downward by management, as necessary, for changes in relevant valuation factors subsequent to the appraisal date, or the present value of expected future cash flows for non-collateral dependent loans and troubled debt restructurings.
Other Real Estate Owned:  At December 31, 2014 and 2013, the Company had assets acquired through foreclosure of $752,000 and $634,000, respectively, recorded at estimated fair value, less estimated selling costs when acquired, thus establishing a new cost basis.  Estimated fair value is generally based on independent appraisals.  These appraisals include adjustments to comparable assets based on the appraisers’ market knowledge and experience, and are considered Level 3 inputs.  When an asset is acquired, the excess of the loan balance over fair value, less estimated selling costs, is charged to the allowance for loan losses.  If the estimated fair value of the asset declines, a write-down is recorded through non-interest expense.  The valuation of foreclosed assets is subjective in nature and may be adjusted in the future because of changes in the economic conditions.
In addition, the Company may be required, from time to time, to measure the fair value of certain other financial assets on a nonrecurring basis in accordance with U.S. generally accepted accounting principles.  The adjustments to fair value usually result from the application of lower-of-cost-or-market accounting or write downs of individual assets.
Fair Value of Financial Instruments
The FASB Accounting Standards Topic for Financial Instruments requires disclosure of the fair value of financial assets and financial liabilities, including those financial assets and financial liabilities that are not measured and reported at fair value on a recurring or non-recurring basis.  The methodologies for estimating the fair value of financial assets and financial liabilities that are measured at fair value on a recurring or non-recurring basis are discussed above.  The following methods and assumptions were used to estimate the fair value of other financial assets and financial liabilities not already discussed above:
(a)	Cash, Cash Equivalents, and Certificates of Deposit
Cash and cash equivalents are short-term in nature with original maturities of three months or less; the carrying amount approximates fair value. Certificates of deposits having original terms of six-months or less; carrying value generally approximates fair value. Certificate of deposits with an original maturity of six months or greater the fair value is derived from discounted cash flows.
(b)	Securities (Held-to-Maturity)
The estimated fair values for substantially all of our securities are obtained from an independent nationally recognized pricing service.  The independent pricing service utilizes market prices of same or similar securities whenever such prices are available.  Prices involving distressed sellers are not utilized in determining fair value.  Where necessary, the independent third-party pricing service estimates fair value using models employing techniques such as discounted cash flow analyses.  The assumptions used in these models typically include assumptions for interest rates, credit losses, and prepayments, utilizing market observable data where available.
(c)	Federal Home Loan Bank of New York Stock
The fair value for Federal Home Loan Bank of New York stock is its carrying value, since this is the amount for which it could be redeemed and there is no active market for this stock.
(d)	Loans (Held-for-Investment)
Fair values are estimated for portfolios of loans with similar financial characteristics.  Loans are segregated by type such as originated and purchased, and further segregated by residential mortgage, construction, land, multifamily, commercial and consumer.  Each loan category is further segmented into amortizing and non-amortizing and fixed and adjustable rate interest terms and by performing and non-performing categories.  The fair value of loans is estimated by discounting the future cash flows using current prepayment assumptions and current rates at which similar loans would be made to borrowers with similar credit ratings and for the same remaining maturities.  This method of estimating fair value does not incorporate the exit price concept of fair value prescribed by the FASB ASC Topic for Fair Value Measurements and Disclosures, which would also consider adjustments for other factors such as liquidity and credit quality. The fair value would be affected significantly by these other factors.
(e)	Loans (Held-for-Sale)
Held-for-sale loans are carried at the lower of aggregate cost or estimated fair value, less costs to sell, and therefore fair value is equal to carrying value.
(f)	Deposits
The fair value of deposits with no stated maturity, such as non‑interest‑bearing demand deposits, savings, NOW and money market accounts, is equal to the amount payable on demand.  The fair value of certificates of deposit is based on the discounted value of contractual cash flows.  The discount rate is estimated using the rates currently offered for deposits of similar remaining maturities.
(g)	Commitments to Extend Credit and Standby Letters of Credit
The fair value of commitments to extend credit and standby letters of credit are estimated using the fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements and the present creditworthiness of the counterparties.  For fixed-rate loan commitments, fair value also considers the difference between current levels of interest rates and the committed rates. The fair value of off‑balance‑sheet commitments is insignificant and therefore not included in the following table.
(h)	Borrowings
The fair value of borrowings is estimated by discounting future cash flows based on rates currently available for debt with similar terms and remaining maturity.
(i)	Advance Payments by Borrowers
Advance payments by borrowers for taxes and insurance have no stated maturity; the fair value is equal to the amount currently payable.
The estimated fair values of the Company’s significant financial instruments at December 31, 2014 and 2013, are presented in the following table (in thousands):
	December 31, 2014
			Estimated Fair Value
	Carrying Value		Level 1			Level 2		Level 3		Total
Financial assets:
Cash and cash equivalents	$	76,709	$	76,709		$	—	$	—	$	76,709
Trading securities	6,422		6,422			—		—		6,422
Securities available-for-sale	771,239		410			770,829		—		771,239
Securities held-to-maturity	3,609					3,691				3,691
Federal Home Loan Bank of New York stock, at cost	29,219		—			29,219		—		29,219
Net loans held-for-investment	1,942,995		—			—		1,949,511		1,949,511
Financial liabilities:
Deposits	$	1,620,665	$	—		$	1,622,536	$	—	$	1,622,536
Repurchase agreements and other borrowings	778,658		—			781,196		—		781,196
Advance payments by borrowers	7,792		—			7,792		—		7,792
	December 31, 2013
			Estimated Fair Value
	Carrying Value		Level 1			Level 2		Level 3		Total
Financial assets:
Cash and cash equivalents	$	61,239	$	61,239		$	—	$	—	$	61,239
Trading securities	5,998		5,998			—		—		5,998
Securities available-for-sale	937,085		510			936,575		—		937,085
Federal Home Loan Bank of New York stock, at cost	17,516		—			17,516		—		17,516
Loans held-for-sale	471		—			—		471		471
Net loans held-for-investment	1,489,476		—			—		1,472,096		1,472,096
Financial liabilities:
Deposits	$	1,492,689	$	—		$	1,495,810	$	—	$	1,495,810
Repurchase agreements and other borrowings	470,325		—			476,893		—		476,893
Advance payments by borrowers	6,441		—			6,441		—		6,441
Limitations
Fair value estimates are made at a specific point in time, based on relevant market information and information about the financial instrument.  These estimates do not reflect any premium or discount that could result from offering for sale at one time the Company’s entire holdings of a particular financial instrument.  Because no market exists for a significant portion of the Company’s financial instruments, fair value estimates are based on judgments regarding future expected loss experience, current economic conditions, risk characteristics of various financial instruments, and other factors.  These estimates are subjective in nature and involve uncertainties and matters of significant judgment and, therefore, cannot be determined with a high degree of precision.  Changes in assumptions could significantly affect the estimates.
Fair value estimates are based on existing on‑ and off‑balance‑sheet financial instruments without attempting to estimate the value of anticipated future business and the value of assets and liabilities that are not considered financial instruments.  In addition, the tax ramifications related to the realization of the unrealized gains and losses can have a significant effect on fair value estimates and have not been considered in the estimates.

Stock_Repurchase_Program

Stock Repurchase Program	12 Months Ended
	Dec. 31, 2014
Stockholders' Equity Note [Abstract]
Stock Repurchase Program	Stock Repurchase Program
	All of the Company's share repurchase programs, noted below, permit shares to be repurchased in open market or private transactions, through block trades, and pursuant to any trading plan that may be adopted in accordance with Rule 10b5-1 of the Securities and Exchange Commission.
	During 2014, the Company's Board of Directors authorized the repurchase of up to $170.0 million of the Company's common stock. The number of shares remaining to be purchased at December 31, 2014, is calculated utilizing the remaining approved repurchase amount of $32.2 million divided by the closing price of the stock on that day.
	On July 31, 2013, the Company's Board of Directors authorized the repurchase of up to 300,093 shares of common stock to fund grants of restricted stock under its 2008 Equity Incentive Plan.

Earnings_Per_Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share
	The following is a summary of the Company’s earnings per share calculations and reconciliation of basic to diluted earnings per share for the periods indicated (in thousands, except share data):
		December 31,
		2014		2013		2012
	Net income available to common stockholders	$	20,266	$	19,147	$	16,031
	Weighted average shares outstanding-basic	49,006,129		54,637,680		54,339,467
	Effect of non-vested restricted stock and stock options outstanding	1,026,130		922,629		776,213
	Weighted average shares outstanding-diluted	50,032,259		55,560,309		55,115,680
	Earnings per share-basic	$	0.41	$	0.35	$	0.3
	Earnings per share-diluted	$	0.41	$	0.34	$	0.29
	Anti-dilutive shares	1,471,303		—		—

ParentOnly_Financial_Informati

Parent-Only Financial Information	12 Months Ended
	Dec. 31, 2014
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Parent-Only Financial Information	Parent-only Financial Information
	The following condensed parent company only financial information reflects Northfield Bancorp, Inc.’s investment in its wholly-owned consolidated subsidiary, Northfield Bank, using the equity method of accounting.
	Northfield Bancorp, Inc.
	Condensed Balance Sheets
		December 31,
		2014			2013
		(in thousands)
	Assets
	Cash in Northfield Bank	$	53,681		$	141,331
	Interest-earning deposits in other financial institutions	2,636			224
	Investment in Northfield Bank	509,809			547,216
	ESOP loan receivable	26,934			27,799
	Other assets	1,048			80
	Total assets	$	594,108		$	716,650
	Liabilities and Stockholders' Equity
	Total liabilities	$	180		$	542
	Total stockholders' equity	593,928			716,108
	Total liabilities and stockholders' equity	$	594,108		$	716,650
	Northfield Bancorp, Inc.
	Condensed Statements of Comprehensive Income (Loss)
		Years Ended
		December 31,
		2014			2013			2012
		(in thousands)
	Interest on ESOP loan	$	903		$	904		$	490
	Interest income on deposit in Northfield Bank	251			286			18
	Interest income on corporate bonds	—			13			157
	Gain on securities transactions, net	(2		)	—			—
	Undistributed earnings of Northfield Bank	20,331			19,157			16,360
	Total income	21,483			20,360			17,025
	Other expenses	956			1,188			1,249
	Income tax expense (benefit)	261			25			(255		)
	Total expense	1,217			1,213			994
	Net income	$	20,266		$	19,147		$	16,031
	Comprehensive income (loss):
	Net income	$	20,266		$	19,147		$	16,031
	Other comprehensive income (loss), net of tax	3,885			(22,881		)	761
	Comprehensive income (loss)	$	24,151		$	(3,734	)	$	16,792
	Northfield Bancorp, Inc.
	Condensed Statements of Cash Flows
		December 31,
		2014			2013			2012
		(in thousands)
	Cash flows from operating activities
	Net income	$	20,266		$	19,147		$	16,031
	Adjustments to reconcile net income to net cash provided by operating activities:
	Decrease in accrued interest receivable	—			94			1
	Decrease in due to Northfield Bank	—			(541		)	(704		)
	(Increase) decrease in other assets	(969		)	1,271			1,394
	Amortization of premium on corporate bond	—			—			68
	(Decrease) increase in other liabilities	(362		)	(556		)	510
	Undistributed earnings of Northfield Bank	(20,329		)	(19,157		)	(16,360		)
	Net cash (used in) provided by operating activities	(1,394		)	258			940
	Cash flows from investing activities
	Additional investment in Northfield Bank	—			(172,299		)	—
	Dividends from Northfield Bank	66,274			—			—
	Maturities of corporate bonds	—			5,173			—
	Loan to ESOP	—			(14,224		)	—
	Net cash provided by (used in) investing activities	66,274			(181,350		)	—
	Cash flows from financing activities
	Proceeds from sale of common stock	—			344,202			—
	Principal payments on ESOP loan receivable	865			950			430
	Purchase of treasury stock	(138,702		)	(3,628		)	(4,344		)
	Dividends paid	(12,884		)	(26,859		)	(1,722		)
Merger of Northfield Bancorp, MHC	—			124			—
Exercise of stock options	212			21			—
Additional tax benefit on stock awards	390			296			—
Net cash (used in) provided by financing activities	(150,119		)	315,106			(5,636		)
Net (decrease) increase in cash and cash equivalents	(85,239		)	134,014			(4,696		)
Cash and cash equivalents at beginning of year	141,555			7,541			12,237
Cash and cash equivalents at end of year	$	56,316		$	141,555		$	7,541
Selected Quarterly Financial Data (Unaudited)
The following tables are a summary of certain quarterly financial data for the years ended December 31, 2014 and 2013:
	2014 Quarter Ended
	31-Mar			30-Jun			30-Sep			31-Dec
	(Dollars in thousands, except per share data)
Selected Operating Data:
Interest income	$	22,764		$	22,151		$	22,707		24,079
Interest expense	3,649			3,631			3,737			4,335
Net interest income	19,115			18,520			18,970			19,744
Provision for loan losses	417			(146		)	317			57
Net interest income after provision for loan losses	18,698			18,666			18,653			19,687
Other income	2,172			2,387			1,840			2,061
Other expenses	12,063			12,698			13,268			14,013
Income before income tax  expense	8,807			8,355			7,225			7,735
Income tax  expense	3,588			2,915			2,496			2,857
Net income	$	5,219		$	5,440		$	4,729		$	4,878
Net income per common share- basic	$	0.1		$	0.11		$	0.1		$	0.11
Net income per common share- diluted	$	0.1		$	0.11		$	0.1		$	0.11
	2013 Quarter Ended
	31-Mar			30-Jun			30-Sep			31-Dec
	(Dollars in thousands, except per share data)
Selected Operating Data:
Interest income	$	23,516		$	22,954		$	23,380		$	22,620
Interest expense	4,751			4,199			4,060			3,938
Net interest income	18,765			18,755			19,320			18,682
Provision for loan losses	277			417			817			416
Net interest income after provision for loan losses	18,488			18,338			18,503			18,266
Other income	3,256			1,698			2,588			2,619
Other expenses	14,366			13,209			13,309			12,989
Income before income tax  expense	7,378			6,827			7,782			7,896
Income tax  expense	2,586			2,528			2,682			2,940
Net income	$	4,792		$	4,299		$	5,100		$	4,956
Net income per common share- basic	$	0.09		$	0.08		$	0.09		$	0.09
Net income per common share- diluted	$	0.09		$	0.08		$	0.09		$	0.09

Summary_Of_Significant_Account1

Summary Of Significant Accounting Policies (Policy)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Plan Of Conversion And Reorganization	(a)    Plan of Conversion and Reorganization
	On June 6, 2012, the Board of Trustees of Northfield Bancorp, MHC (MHC) and the Board of Directors of the Company adopted a Plan of Conversion and Reorganization (the Plan).  Pursuant to the Plan, the MHC converted from the mutual holding company form of organization to the fully public form on January 24, 2013.  The MHC was merged into the Company, and the MHC no longer exists.  The Company merged into a new Delaware corporation named Northfield Bancorp, Inc.  As part of the conversion, the MHC’s ownership interest of the Company was offered for sale in a public offering.  The existing publicly held shares of the Company, which represented the remaining ownership interest in the Company, were exchanged for new shares of common stock of Northfield Bancorp, Inc., the new Delaware Corporation.  The exchange ratio ensured that immediately after the conversion and public offering, the public shareholders of the Company owned the same aggregate percentage of Northfield Bancorp., Inc. common stock that they owned immediately prior to that time (excluding shares purchased in the stock offering and cash received in lieu of fractional shares).  When the conversion and public offering was completed, all of the capital stock of Northfield Bank was owned by Northfield Bancorp, Inc., the Delaware Corporation.
	The Plan provided for the establishment of special “liquidation accounts” for the benefit of certain depositors of Northfield Bank in an amount equal to the greater of the MHC’s ownership interest in the retained earnings of the Company as of the date of the latest balance sheet contained in the prospectus or the retained earnings of Northfield Bank at the time it reorganized into the MHC.  Following the completion of the conversion, under the rules of the Board of Governors of the Federal Reserve System, Northfield Bank is not permitted to pay dividends on its capital stock to Northfield Bancorp, Inc., its sole shareholder, if Northfield Bank’s shareholder’s equity would be reduced below the amount of the liquidation accounts.  The liquidation accounts will be reduced annually to the extent that eligible account holders have reduced their qualifying deposits.  Subsequent increases in qualifying deposits will not restore an eligible account holder’s interest in the liquidation accounts.
Basis Of Presentation	(b)    Basis of Presentation
	The consolidated financial statements are comprised of the accounts of Northfield Bancorp, Inc. and its wholly owned subsidiaries, Northfield Investment, Inc. and Northfield Bank (the Bank) and the Bank’s wholly-owned significant subsidiaries, NSB Services Corp. and NSB Realty Trust.  All significant intercompany accounts and transactions have been eliminated in consolidation.
	In preparing the consolidated financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the balance sheets and revenues and expenses during the reporting periods.  Actual results may differ significantly from those estimates and assumptions.  A material estimate that is particularly susceptible to significant change in the near term is the allowance for loan losses.  In connection with the determination of this allowance, management generally obtains independent appraisals for significant properties.  In addition, judgments related to the amount and timing of expected cash flows from PCI loans, goodwill, securities valuation and impairment, and deferred income taxes, involve a higher degree of complexity and subjectivity and require estimates and assumptions about highly uncertain matters.  Actual results may differ from the estimates and assumptions.
	Certain prior year balances have been reclassified to conform to the current year presentation.
Business	(c)    Business
	The Company, through its principal subsidiary, the Bank, provides a full range of banking services primarily to individuals and corporate customers in Richmond and Kings Counties in New York, and Union and Middlesex Counties in New Jersey.  The Company is subject to competition from other financial institutions and to the regulations of certain federal and state agencies, and undergoes periodic examinations by those regulatory authorities.
Cash Equivalents	(d)    Cash Equivalents
	Cash equivalents consist of cash on hand, due from banks, and interest-bearing deposits in other financial institutions with an original term of three months or less.
Securities	(e)    Securities
	Securities are classified at the time of purchase, based on management’s intention, as securities held- to-maturity, securities available-for-sale, or trading account securities.  Securities held-to-maturity are those that management has the positive intent and ability to hold until maturity.  Securities held-to-maturity are carried at amortized cost, adjusted for amortization of premiums and accretion of discounts using the level‑yield method over the contractual term of the securities, adjusted for actual prepayments.  Securities available-for-sale represents all securities not classified as either held-to-maturity or trading.  Securities available-for-sale are carried at estimated fair value with unrealized holding gains and losses (net of related tax effects) on such securities excluded from earnings, but included as a separate component of stockholders’ equity, titled “Accumulated other comprehensive income  (loss).”  The cost of securities sold is determined using the specific‑identification method.  Security transactions are recorded on a trade-date basis. Trading securities are securities that are bought and may be held for the purpose of selling them in the near term.  Trading securities are reported at estimated fair value, with unrealized holding gains and losses reported as a component of gain (loss) on securities transactions, net in non-interest income.
	Our evaluation of other-than-temporary impairment considers the duration and severity of the impairment, our intent and ability to hold the securities, and our assessments of the reason for the decline in value and the likelihood of a near-term recovery.  If a determination is made that a debt security is other-than-temporarily impaired, the Company will estimate the amount of the unrealized loss that is attributable to credit and all other non-credit related factors.  If we intend to hold securities in an unrealized loss position until the loss is recovered, which may be at maturity,  the credit related component will be recognized as an other-than-temporary impairment charge in non-interest income.  The non-credit related component will be recorded as an adjustment to accumulated other comprehensive income (loss), net of tax.  The estimated fair value of debt securities, including mortgage-backed securities and corporate debt obligations is furnished by an independent third-party pricing service.  The third-party pricing service primarily utilizes pricing models and methodologies that incorporate observable market inputs, including among other things, benchmark yields, reported trades, and projected prepayment and default rates.  Management reviews the data and assumptions used in pricing the securities by its third-party provider for reasonableness.
Loans	(f)    Loans
	During 2012 and 2011, the Company acquired loans with deteriorated credit quality, herein referred to as PCI loans, and transferred certain loans, previously originated and designated by the Company as held-for-investment, to held-for-sale.  The accounting and reporting for these loans differs substantially from those loans originated and classified by the Company as held-for-investment.  For purposes of reporting, discussion and analysis, management has classified its loan portfolio into four categories:  (1) loans originated by the Company and held-for-sale, which are carried at the lower of aggregate cost or estimated fair value, less costs to sell, and therefore have no associated allowance for loan losses, (2) PCI loans, which are held-for-investment, and initially valued at estimated fair value on the date of acquisition, with no initial related allowance for loan losses, and (3) originated loans held-for-investment, which are carried at amortized cost, less net charge-offs and the allowance for loan losses, and (4) acquired loans with no evidence of credit deterioration, which are held-for-investment, and initially valued at an estimated fair value on the date of acquisition, with no initial related allowance for loan losses.
	Originated and acquired net loans held-for-investment are stated at unpaid principal balance, adjusted by unamortized premiums and unearned discounts, deferred origination fees and certain direct origination costs, and the allowance for loan losses.  Interest income on loans is accrued and credited to income as earned.  Net loan origination fees/costs are deferred and accreted/amortized to interest income over the loan’s contractual life using the level-yield method, adjusted for actual prepayments.  Generally, loans held-for-sale are designated at time of origination and generally consist of  newly originated fixed rate residential loans and are recorded at the lower of aggregate cost or estimated fair value in the aggregate.  In 2013 and 2012, the Company transferred from held-for-investment to held-for-sale certain impaired loans. Transfers from held-for-investment are infrequent and occur at fair value less costs to sell, with any charge-off to allowance for loan losses. Gains are recognized on a settlement-date basis and are determined by the difference between the net sales proceeds and the carrying value of the loans, including any net deferred fees or costs.
	Originated and acquired net loans held-for-investment are deemed impaired when it is probable, based on current information, that the Company will not collect all amounts due in accordance with the contractual terms of the loan agreement.  The Company has defined the population of originated and acquired impaired loans to be all originated and acquired non-accrual loans held-for-investment with an outstanding balance of $500,000 or greater and all loans restructured in troubled debt restructurings (TDRs).  Originated and acquired impaired loans held-for-investment are individually assessed to determine that the loan’s carrying value is not in excess of the expected future cash flows, discounted at the loans original effective interest rate, or the underlying collateral (less estimated costs to sell) if the loan is collateral dependent.  Impairments, if any, are recognized through a charge to the provision for loan losses for the amount that the loan’s carrying value exceeds the discounted cash flow analysis or estimated fair value of collateral (less estimated costs to sell) if the loan is collateral dependent.  Such amounts are charged-off when considered appropriate.  Homogeneous loans with balances less than $500,000, which are not considered TDRs, are collectively evaluated for impairment.
	The allowance for loan losses is increased by the provision for loan losses charged against income and is decreased by charge-offs, net of recoveries.  Loan losses are charged-off in the period the loans, or portion thereof, are deemed uncollectible.  Generally, the Company will record a loan charge-off (including a partial charge-off) to reduce a loan to the estimated fair value of the underlying collateral, less cost to sell, if it is determined that it is probable that recovery will come primarily from the sale or operation of such collateral.  Specific reserves on impaired loans which are not considered collateral dependent are charged-off when such amounts are not considered to be collectible.  The provision for loan losses is based on management’s evaluation of the adequacy of the allowance which considers, among other things, impaired loans held-for-investment, deterioration in PCI loans subsequent to acquisition, past loan loss experience, known and inherent risks in the portfolio, and existing adverse situations that may affect borrowers’ ability to repay.  Additionally, management evaluates changes, if any, in underwriting standards, collection, charge-off and recovery practices, the nature or volume of the portfolio, lending staff, concentration of loans, as well as current economic conditions, and other relevant factors.  Management believes the allowance for loan losses is adequate to provide for probable and reasonably estimable losses at the date of the consolidated balance sheets.  The Company also maintains an allowance for estimated losses on off-balance sheet credit risks related to loan commitments and standby letters of credit.  Management utilizes a methodology similar to its allowance for loan loss adequacy methodology to estimate losses on these commitments.  The allowance for estimated credit losses on off-balance sheet commitments is included in other liabilities and any changes to the allowance are recorded as a component of other non-interest expense.
	While management uses available information to recognize probable and reasonably estimable losses on loans, future additions may be necessary based on changes in conditions, including changes in economic conditions, particularly in Richmond and Kings Counties in New York, and Union and Middlesex Counties in New Jersey and to a lesser extent Eastern Pennsylvania.  Accordingly, as with most financial institutions in the market area, the ultimate collectability of a substantial portion of the Company’s loan portfolio is susceptible to changes in conditions in the Company’s marketplace.  In addition, future changes in laws and regulations could make it more difficult for the Company to collect all contractual amounts due on its loans and mortgage-backed securities.
	In addition, various regulatory agencies, as an integral part of their examination process, periodically review the Company’s allowance for loan losses.  Such agencies may require the Company to recognize additions to the allowance based on their judgments about information available to them at the time of their examination.
	TDRs are those loans whose terms have been modified because of deterioration in the financial condition of the borrower.  Modifications could include extension of the repayment terms of the loan, reduced interest rates, and forgiveness of accrued interest and/or principal.  Once an obligation has been restructured because of such credit problems, it continues to be considered restructured until paid in full or, if the obligation yields a market rate (a rate equal to the rate the Company was willing to accept at the time of the restructuring for a new loan with comparable risk), until the year subsequent to the year in which the restructuring takes place, provided the borrower has performed under the modified terms for a six-month period.  The Company records an impairment charge equal to the difference between the present value of estimated future cash flows under the restructured terms discounted at the original loan’s effective interest rate, or the underlying collateral value less costs to sell, if the loan is collateral dependent.  Changes in present values attributable to the passage of time are recorded as a component of the provision for loan losses.
	A loan is considered past due when it is not paid in accordance with its contractual terms.  The accrual of income on loans, including impaired loans held-for-investment, and other loans in the process of foreclosure, is generally discontinued when a loan becomes 90 days or more delinquent, or sooner when certain factors indicate that the ultimate collection of principal and interest is in doubt.  Loans on which the accrual of income has been discontinued are designated as non-accrual loans.  All previously accrued interest is reversed against interest income, and income is recognized subsequently only in the period that cash is received, provided no principal payments are due and the remaining principal balance outstanding is deemed collectible.  A non-accrual loan is not returned to accrual status until both principal and interest payments are brought current and factors indicating doubtful collection no longer exist, including performance by the borrower under the loan terms for a six-month period.
	The Company accounts for the PCI loans based on expected cash flows. In accordance with current accounting guidance, the Company will maintain the integrity of a pool of multiple loans accounted for as a single asset and evaluate the pools for impairment, and accrual status, based on variances from the expected cash flows.
Federal Home Loan Bank Stock	(g)    Federal Home Loan Bank Stock
	The Bank, as a member of the Federal Home Loan Bank of New York (the FHLB), is required to hold shares of capital stock in the FHLB as a condition to both becoming a member and engaging in certain transactions with the FHLB.  The minimum investment requirement is determined by a “membership” investment component and an “activity-based” investment component.  The membership investment component is the greater of 0.20% of the Bank’s mortgage-related assets, as defined by the FHLB, or $1,000.  The activity-based investment component is equal to 4.5% of the Bank’s outstanding advances with the FHLB.  The activity-based investment component also considers other transactions, including assets originated for or sold to the FHLB, and delivery commitments issued by the FHLB.  The Company currently does not enter into these other types of transactions with the FHLB.
	On a quarterly basis, we perform our other-than-temporary impairment analysis of FHLB stock, we evaluate, among other things, (i) its earnings performance, including the significance of any decline in net assets of the FHLB as compared to the regulatory capital amount of the FHLB, (ii) the commitment by the FHLB to continue dividend payments, and (iii) the liquidity position of the FHLB.  We did not consider our investment in FHLB stock to be other-than-temporarily impaired at December 31, 2014, and 2013.
Premises And Equipment, Net	(h)    Premises and Equipment, Net
	Premises and equipment, including leasehold improvements, are carried at cost, less accumulated depreciation and amortization.  Depreciation and amortization of premises and equipment, including capital leases, are computed on a straight‑line basis over the estimated useful lives of the related assets.  The estimated useful lives of significant classes of assets are generally as follows: buildings - forty years; furniture and equipment - five to seven years; and purchased computer software - three years.  Leasehold improvements are amortized over the shorter of the term of the related lease or the estimated useful lives of the improvements.  Major improvements are capitalized, while repairs and maintenance costs are charged to operations as incurred.  Upon retirement or sale, any gain or loss is credited or charged to operations.
Bank Owned Life Insurance	(i)    Bank Owned Life Insurance
	The Company has purchased bank owned life insurance contracts to help fund its obligations for certain employee benefit costs.  The Company’s investment in such insurance contracts has been reported in the consolidated balance sheets at their cash surrender values.  Changes in cash surrender values and death benefit proceeds received in excess of the related cash surrender values are recorded as non-interest income.
Goodwill	(j)    Goodwill
	Intangible assets resulting from acquisitions under the purchase method of accounting consist of goodwill and other intangible assets.  Goodwill is not amortized and is subject to an annual assessment for impairment. The goodwill impairment analysis is generally a two-step test. However, we may, under current accounting guidance, first assess qualitative factors to determine whether it is necessary to perform the two-step quantitative goodwill impairment test. Under current accounting guidance, we are not required to calculate the fair value of a reporting unit if, based on a qualitative assessment, we determine that it was more likely than not that the unit’s fair value was not less than its carrying amount. During 2014, we elected to perform step one of the two-step goodwill impairment test for our reporting unit, but we may choose to perform the optional quantitative assessment in future periods.
	Goodwill is allocated to Northfield’s reporting unit at the date goodwill is actually recorded. If the carrying value of a reporting unit exceeds its estimated fair value, a second step in the analysis is performed to determine the amount of impairment, if any. The second step compares the implied fair value of the reporting unit’s goodwill with the carrying amount of that goodwill. If the carrying value of a reporting unit exceeds the implied fair value of the goodwill, an impairment charge is recorded equal to the excess amount in the current period earnings.
	As of December 31, 2014, the carrying value of goodwill totaled $16.2 million.  The Company performed its annual goodwill impairment test, as of December 31, 2014, and determined that the fair value of the Company’s single reporting unit to be in excess of its carrying value.  The Company will test goodwill for impairment between annual test dates if an event occurs or circumstances change that would indicate the fair value of the reporting unit is below its carrying amount. No events have occurred and no circumstances have changed since the annual impairment test date that would indicate the fair value of the reporting unit is below its carrying amount.
Income Taxes	(k)    Income Taxes
	Income taxes are accounted for under the asset and liability method.  Deferred tax assets and liabilities are recognized for the estimated future tax consequences attributable to temporary differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases.  Deferred tax assets and liabilities are measured using enacted tax rates expected to apply in the year in which those temporary differences are expected to be recovered or settled.  When applicable, deferred tax assets are reduced by a valuation allowance for any portions determined not likely to be realized. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date.
	Income tax benefits are recognized and measured based upon a two-step model: 1) a tax position must be more-likely-than-not to be sustained based solely on its technical merits in order to be recognized, and 2) the benefit is measured as the largest dollar amount of that position that is more-likely-than-not to be sustained upon settlement. The difference between the benefit recognized and the tax benefit claimed on a tax return is referred to as an unrecognized tax benefit (UTB). The Corporation records income tax-related interest and penalties, if applicable, within income tax expense.
Impairment Of Long-Lived Assets	(l)    Impairment of Long‑Lived Assets
	Long‑lived assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of the asset may not be recoverable.  Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to future undiscounted (and without interest) net cash flows expected to be generated by the asset.  If such assets are considered to be impaired, the impairment to be recognized is measured by the amount by which the carrying amount of the assets exceeds the fair value of the assets.  Assets to be disposed of are reported at the lower of the carrying amount or fair value less costs to sell.
Securities Sold Under Agreements To Repurchase And Other Borrowings	(m)    Securities Sold Under Agreements to Repurchase and Other Borrowings
	The Company enters into sales of securities under agreements to repurchase (Repurchase Agreements) and collateral pledge agreements (Pledge Agreements) with selected dealers and banks.  Such agreements are accounted for as secured financing transactions since the Company maintains effective control over the transferred or pledged securities and the transfer meets the other accounting and recognition criteria as required by the transfer and servicing topic of the FASB Accounting Standards.  Obligations under these agreements are reflected as a liability in the consolidated balance sheets.  Securities underlying the agreements are maintained at selected dealers and banks as collateral for each transaction executed and may be sold or pledged by the counterparty.  Collateral underlying Repurchase Agreements which permit the counterparty to sell or pledge the underlying collateral is disclosed on the consolidated balance sheets as “encumbered.”  The Company retains the right under all Repurchase Agreements and Pledge Agreements to substitute acceptable collateral throughout the terms of the agreement.
Comprehensive (Loss) Income	(n)    Comprehensive Income (Loss)
	Comprehensive income (loss) includes net income and the change in unrealized holding gains and losses on securities available-for-sale, change in actuarial gains and losses on other post retirement benefits, and change in service cost on other postretirement benefits, net of taxes.  Comprehensive income (loss) is presented in the Consolidated Statements of Comprehensive Income (Loss).
Employee Benefits	(o)   Benefits
	The Company sponsors a defined postretirement benefit plan that provides for medical and life insurance coverage to a limited number of retirees, as well as life insurance to all qualifying employees of the Company.  The estimated cost of postretirement benefits earned is accrued during an individual’s estimated service period to the Company.    The Company recognizes in its balance sheet the over-funded or under-funded status of a defined benefit postretirement plan measured as the difference between the fair value of plan assets and the benefit obligation at the end of our calendar year.  The actuarial gains and losses and the prior service costs and credits that arise during the period are recognized as a component of other comprehensive income (loss), net of tax.
	Funds borrowed by the Employee Stock Ownership Plan (ESOP) from the Company to purchase the Company’s common stock are being repaid from the Bank’s contributions over a period of up to 30 years.  The Company’s common stock not yet allocated to participants is recorded as a reduction of stockholders’ equity at cost.  The Company records compensation expense related to the ESOP at an amount equal to the shares committed to be released by the ESOP multiplied by the average fair value of our common stock during the reporting period.
	The Company recognizes the grant-date fair value of stock based awards issued to participants' as compensation cost in the consolidated statements of comprehensive income (loss).  The fair value of common stock awards is based on the closing price of our common stock as reported on the NASDAQ Stock Market on the grant date.  The expense related to stock options is based on the estimated fair value of the options at the date of the grant using the Black-Scholes pricing model.  The awards are fixed in nature and compensation cost related to stock based awards is recognized on a straight-line basis over the requisite service periods.
	The Bank has a 401(k) plan covering substantially all employees.  Contributions to the plan are expensed as incurred.
Segment Reporting	(p)    Segment Reporting
	As a community-focused financial institution, substantially all of the Company’s operations involve the delivery of loan and deposit products to customers.  Management makes operating decisions and assesses performance based on an ongoing review of these community banking operations, which constitute the Company’s only operating segment for financial reporting purposes.
Net Income Per Common Share	(q)    Net Income per Common Share
	Net income per common share-basic is computed by dividing the net income available to common stockholders by the weighted average number of common shares outstanding, excluding unallocated ESOP shares and unearned common stock award shares.  The weighted average common shares outstanding includes the average number of shares of common stock outstanding, including shares held by Northfield Bancorp, MHC and allocated or committed to be released ESOP shares.
	Net income per common share-diluted is computed using the same method as basic earnings per share, but reflects the potential dilution that could occur if stock options and unvested shares of restricted stock were exercised and converted into common stock.  These potentially dilutive shares are included in the weighted average number of shares outstanding for the period using the treasury stock method.  When applying the treasury stock method, we add: (1) the assumed proceeds from option exercises; (2) the tax benefit, if any, that would have been credited to additional paid-in capital assuming exercise of non-qualified stock options and vesting of shares of restricted stock; and (3) the average unamortized compensation costs related to unvested shares of restricted stock and stock options.  We then divide this sum by our average stock price for the period to calculate assumed shares repurchased.  The excess of the number of shares issuable over the number of shares assumed to be repurchased is added to basic weighted average common shares to calculate diluted earnings per share.
Other Real Estate Owned	(r)    Other Real Estate Owned
	Assets acquired through loan foreclosure, or deed-in-lieu of, are held for sale and are initially recorded at estimated fair value less estimated selling costs when acquired, thus establishing a new cost basis.  Costs after acquisition are generally expensed.  If the estimated fair value of the asset declines, a write-down is recorded through other non-interest expense.

Securities_AvailableForSale_Ta

Securities Available-For-Sale (Tables)	12 Months Ended
	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Comparative Summary Of Mortgage-Backed Securities And Other Securities Available-For-Sale	The following is a comparative summary of mortgage-backed securities and other securities available-for-sale at December 31, 2014 and 2013 (in thousands):
		2014
					Gross			Gross			Estimated
		Amortized			unrealized			unrealized			fair
		cost			gains			losses			value
	Mortgage-backed securities:
	Pass-through certificates:
	Government sponsored enterprises (GSE)	$	292,162		$	8,309		$	1,131		$	299,340
	Real estate mortgage investment conduits (REMICs):
	GSE	408,328			1,314			9,192			400,450
	Non-GSE	1,060			—			34			1,026
		701,550			9,623			10,357			700,816
	Other securities:
	Equity investments-mutual funds	410			—			—			410
	Corporate bonds	69,975			40			2			70,013
		70,385			40			2			70,423
	Total securities available-for-sale	$	771,935		$	9,663		$	10,359		$	771,239
		2013
					Gross			Gross			Estimated
		Amortized			unrealized			unrealized			fair
		cost			gains			losses			value
	Mortgage-backed securities:
	Pass-through certificates:
	GSE	$	366,884		$	8,573		$	5,113		$	370,344
	Real estate mortgage investment conduits (REMICs):
	GSE	497,575			1,699			14,047			485,227
	Non-GSE	4,474			126			48			4,552
		868,933			10,398			19,208			860,123
	Other securities:
	Equity investments-mutual funds	510			—			—			510
	Corporate bonds	76,491			66			105			76,452
		77,001			66			105			76,962
	Total securities available-for-sale	$	945,934		$	10,464		$	19,313		$	937,085
Summary Of Expected Maturity Distribution Of Debt Securities Available-For-Sale, Other Than Mortgage-Backed Securities	The following is a summary of the expected maturity distribution of debt securities available-for-sale other than mortgage‑backed securities at December 31, 2014 (in thousands):
	Available-for-sale		Amortized cost			Estimated fair value
	Due in one year or less		$	41,750		$	41,768
	Due after one year through five years		28,225			28,245
			$	69,975		$	70,013
Activity Related To Credit Component Recognized In Earnings On Debt Securities	The following is a roll forward of 2014, 2013, and 2012 activity related to the credit component of other-than-temporary impairment recognized on debt securities in pre-tax earnings, for which a portion of other-than-temporary impairment was recognized in accumulated other comprehensive income (in thousands):
		2014			2013			2012
	Balance, beginning of year	$	—		$	—		$	578
	Additions to the credit component on debt securities in which other-than-temporary
	impairment was not previously recognized	—			—			—
	Reductions due to sales	—			—			(578		)
	Cumulative pre-tax credit losses, end of year	$	—		$	—		$	—
Gross Unrealized Losses On Mortgage-Backed Securities	Gross unrealized losses on mortgage-backed securities, equity securities, agency bonds, and corporate bonds available-for-sale, and the estimated fair value of the related securities, aggregated by security category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2014 and 2013, were as follows (in thousands):
		December 31, 2014
		Less than 12 months						12 months or more					Total
		Unrealized			Estimated			Unrealized			Estimated		Unrealized		Estimated
		losses			fair value			losses			fair value		losses		fair value
	Mortgage-backed securities:
	Pass-through certificates:
	GSE	$	1		$	181		$	1,130		$	61,526	$	1,131	$	61,707
	REMICs:
	GSE	30			3,179			9,162			229,896		9,192		233,075
	Non-GSE	—			—			34			1,026		34		1,026
	Other securities:
	Corporate bonds	2			9,996			—			—		2		9,996
	Total	$	33		$	13,356		$	10,326		$	292,448	$	10,359	$	305,804
		December 31, 2013
		Less than 12 months						12 months or more					Total
		Unrealized			Estimated			Unrealized			Estimated		Unrealized		Estimated
		losses			fair value			losses			fair value		losses		fair value
	Mortgage-backed securities:
	Pass-through certificates:
	GSE	$	5,087		$	150,473		$	26		$	4,482	$	5,113	$	154,955
	REMICs:
	GSE	12,923			283,419			1,124			44,606		14,047		328,025
	Non-GSE	23			1,092			25			442		48		1,534
	Other securities:
	Corporate bonds	105			44,763			—			—		105		44,763
	Total	$	18,138		$	479,747		$	1,175		$	49,530	$	19,313	$	529,277

Securities_HeldToMaturity_Tabl

Securities Held-To-Maturity (Tables)	12 Months Ended
	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Summary Of Mortgage-Backed Securities Held-To-Maturity	The following is a summary of mortgage-backed securities held-to-maturity at December 31, 2014 (in thousands):
		2014
		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
	Mortgage-backed securities:
	Pass-through certificates:
	GSEs	3,609		82		$	—	3,691
	Total securities held-to-maturity	$	3,609	$	82	$	—	$	3,691

Loans_Tables

Loans (Tables)	12 Months Ended
	Dec. 31, 2014
Receivables [Abstract]
Net Loans Held-For-Investment	Loans held-for-investment, net, consists of the following (in thousands):
		December 31,
		2014				2013
	Real estate loans:
	Multifamily	$	1,072,193			$	870,951
	Commercial mortgage	390,288				340,174
	One-to-four family residential mortgage	74,401				64,753
	Home equity and lines of credit	54,533				46,231
	Construction and land	21,412				14,152
	Total real estate loans	1,612,827				1,336,261
	Commercial and industrial loans	12,945				10,162
	Other loans	2,157				2,310
	Total commercial and industrial and other loans	15,102				12,472
	Deferred loan cost, net	4,565				3,458
	Originated loans held-for-investment, net	1,632,494				1,352,191
	PCI Loans	44,816				59,468
	Loans acquired:
	One-to-four family residential mortgage	234,478				60,262
	Multifamily	18,844				3,930
	Commercial mortgage	11,999				13,254
	Construction and land	364				371
	Total loans acquired	265,685				77,817
	Loans held for investment, net	1,942,995				1,489,476
	Allowance for loan losses	(26,292		)		(26,037		)
	Net loans held-for-investment	$	1,916,703			$	1,463,439
Summary Of Accretable Yield	The following details the accretable yield (in thousands):
		For The Year Ended December 31,
		2014				2013
	Balance at the beginning of year	$	32,464			$	43,431
	Accretable yield at purchase date	—				—
	Accretion into interest income	(4,895		)		(5,701		)
	Net reclassification from non-accretable difference (1)	374				(5,266		)
	Balance at end of year	$	27,943			$	32,464
	(1) Due to re-casting of cash flows for loan pools acquired in the 2011 FDIC-assisted transaction.
Activity In Allowance For Loan Losses	A summary of changes in the allowance for loan losses for the years ended December 31, 2014, 2013, and 2012 follows (in thousands):
		December 31,
		2014				2013				2012
	Balance at beginning of year	$	26,037			$	26,424			$	26,836
	Provision for loan losses	645				1,927				3,536
	Recoveries	402				860				245
	Charge-offs	(792		)		(3,174		)		(4,193		)
	Balance at end of year	$	26,292			$	26,037			$	26,424
Allowance For Loan Losses And Loans Receivable By Portfolio Segment And Based On Impairment Method	The following table sets forth activity in our allowance for loan losses, by loan type, for the years ended December 31, 2014 and 2013.  The following table also details the amount of loans receivable held-for-investment, net of deferred loan fees and costs, that are evaluated individually, and collectively, for impairment, and the related portion of allowance for loan losses that is allocated to each loan portfolio segment (in thousands).
		December 31, 2014
		Real Estate
		Commercial				One-to-Four Family				Construction and Land			Multifamily			Home Equity and Lines of Credit			Commercial and Industrial			Other			Unallocated			Originated Loans Total			PCI			Acquired Loans		Total
	Allowance for loan losses:
	Beginning Balance	$	12,619			$	875			$	205		$	9,374		$	860		$	425		$	67		$	1,024		$	25,449		$	588		$	—	$	26,037
	Charge-offs	(103		)		(58		)		—			(7		)	(489		)	(135		)	—			—			(792		)	—			—		(792		)
	Recoveries	72				—				246			35			—			8			41			—			402			—			—		402
	Provisions (credit)	(3,279		)		134				(185		)	2,817			530			543			26			185			771			(188		)	62		645
	Ending Balance	$	9,309			$	951			$	266		$	12,219		$	901		$	841		$	134		$	1,209		$	25,830		$	400		$	62	$	26,292
	Ending balance: individually evaluated for impairment	$	2,361			$	57			$	—		$	215		$	13		$	109		$	—		$	—		$	2,755		$	—		$	—	$	2,755
	Ending balance: collectively evaluated for impairment	$	6,948			$	894			$	266		$	12,004		$	888		$	732		$	134		$	1,209		$	23,075		$	400		$	62	$	23,537
	Loans, net:
	Ending Balance	$	390,885			$	74,990			$	21,445		$	1,074,539		$	55,486		$	12,992		$	2,157		$	—		$	1,632,494		$	44,816		$	265,685	$	1,942,995
	Ending balance: individually evaluated for impairment	$	29,224			$	1,072			$	—		$	1,990		$	327		$	806		$	—		$	—		$	33,419		$	—		$	855	$	34,274
	Ending balance: collectively evaluated for impairment	$	361,661			$	73,918			$	21,445		$	1,072,549		$	55,159		$	12,186		$	2,157		$	—		$	1,599,075		$	44,816		$	264,830	$	1,908,721
		31-Dec-13
		Real Estate
		Commercial				One-to-Four Family				Construction and Land			Multifamily			Home Equity and Lines of Credit			Commercial and Industrial			Other			Unallocated			Originated Loans Total			PCI			Acquired Loans		Total
	Allowance for loan losses:
	Beginning Balance	$	14,480			$	623			$	994		$	7,086		$	623		$	1,160		$	21		$	1,201		$	26,188		$	236		$	—	$	26,424
	Charge-offs	(1,208		)		(414		)		—			(657		)	(491		)	(379		)	(25		)	—			(3,174		)	—			—		(3,174		)
	Recoveries	1				18				567			—			—			201			73			—			860			—			—		860
	Provisions (credit)	(654		)		648				(1,356		)	2,945			728			(557		)	(2		)	(177		)	1,575			352			—		1,927
	Ending Balance	$	12,619			$	875			$	205		$	9,374		$	860		$	425		$	67		$	1,024		$	25,449		$	588		$	—	$	26,037
	Ending balance: individually evaluated for impairment	$	2,385			$	19			$	—		$	117		$	7		$	104		$	—		$	—		$	2,632		$	—		$	—	$	2,632
	Ending balance: collectively evaluated for impairment	$	10,234			$	856			$	205		$	9,257		$	853		$	321		$	67		$	1,024		$	22,817		$	588		$	—	$	23,405
	Loans, net:
	Ending Balance	$	340,534			$	65,289			$	14,161		$	872,901		$	46,825		$	10,202		$	2,279		$	—		$	1,352,191		$	59,468		$	77,817	$	1,489,476
	Ending balance: individually evaluated for impairment	$	32,194			$	1,115			$	109		$	2,074		$	1,341		$	1,504		$	—		$	—		$	38,337		$	—		$	—	$	38,337
	Ending balance: collectively evaluated for impairment	$	308,340			$	64,174			$	14,052		$	870,827		$	45,484		$	8,698		$	2,279		$	—		$	1,313,854		$	59,468		$	77,817	$	1,451,139
		December 31, 2014
		Real Estate
		Commercial				One-to-Four Family				Construction and Land			Multifamily			Home Equity and Lines of Credit			Commercial and Industrial			Other			Unallocated			Originated Loans Total			PCI			Acquired Loans		Total
	Allowance for loan losses:
	Beginning Balance	$	12,619			$	875			$	205		$	9,374		$	860		$	425		$	67		$	1,024		$	25,449		$	588		$	—	$	26,037
	Charge-offs	(103		)		(58		)		—			(7		)	(489		)	(135		)	—			—			(792		)	—			—		(792		)
	Recoveries	72				—				246			35			—			8			41			—			402			—			—		402
	Provisions (credit)	(3,279		)		134				(185		)	2,817			530			543			26			185			771			(188		)	62		645
	Ending Balance	$	9,309			$	951			$	266		$	12,219		$	901		$	841		$	134		$	1,209		$	25,830		$	400		$	62	$	26,292
	Ending balance: individually evaluated for impairment	$	2,361			$	57			$	—		$	215		$	13		$	109		$	—		$	—		$	2,755		$	—		$	—	$	2,755
	Ending balance: collectively evaluated for impairment	$	6,948			$	894			$	266		$	12,004		$	888		$	732		$	134		$	1,209		$	23,075		$	400		$	62	$	23,537
	Loans, net:
	Ending Balance	$	390,885			$	74,990			$	21,445		$	1,074,539		$	55,486		$	12,992		$	2,157		$	—		$	1,632,494		$	44,816		$	265,685	$	1,942,995
	Ending balance: individually evaluated for impairment	$	29,224			$	1,072			$	—		$	1,990		$	327		$	806		$	—		$	—		$	33,419		$	—		$	855	$	34,274
	Ending balance: collectively evaluated for impairment	$	361,661			$	73,918			$	21,445		$	1,072,549		$	55,159		$	12,186		$	2,157		$	—		$	1,599,075		$	44,816		$	264,830	$	1,908,721
Investment Of Originated Loans Held-For-Investment, Net Of Deferred Fees And Costs, By Loan Type And Credit Quality Indicator	The following table details the recorded investment of originated loans receivable held-for-investment, net of deferred fees and costs, by loan type and credit quality indicator at December 31, 2014 and 2013 (in thousands).
		At December 31, 2014
		Real Estate
		Multifamily								Commercial						One-to-Four Family						Construction and Land			Home Equity and Lines of Credit			Commercial and Industrial			Other			Total
		< 35% LTV				=t; 35% LTV				< 35% LTV			=t; 35% LTV			< 60% LTV			=t; 60% LTV
	Internal Risk Rating
	Pass	$	64,692			$	999,708			$	47,534		$	289,794		$	29,629		$	40,527		$	21,445		$	54,935		$	11,421		$	2,157		$	1,561,842
	Special Mention	283				4,342				2,436			9,792			1,143			—			—			360			652			—			19,008
	Substandard	801				4,713				—			41,329			2,303			1,388			—			191			919			—			51,644
	Originated loans held-for-investment, net	$	65,776			$	1,008,763			$	49,970		$	340,915		$	33,075		$	41,915		$	21,445		$	55,486		$	12,992		$	2,157		$	1,632,494
		At December 31, 2013
		Real Estate
		Multifamily								Commercial						One-to-Four Family						Construction and Land			Home Equity and Lines of Credit			Commercial and Industrial			Other			Total
		< 35% LTV				=t; 35% LTV				< 35% LTV			=t; 35% LTV			< 60% LTV			=t; 60% LTV
	Internal Risk Rating
	Pass	$	40,966			$	817,923			$	42,995		$	240,472		$	28,595		$	30,241		$	13,458		$	45,117		$	7,488		$	2,279		$	1,269,534
	Special Mention	309				7,866				1,304			12,938			2,289			703			595			469			962			—			27,435
	Substandard	821				5,016				1,333			41,492			1,388			2,073			108			1,239			1,752			—			55,222
	Originated loans held-for-investment, net	$	42,096			$	830,805			$	45,632		$	294,902		$	32,272		$	33,017		$	14,161		$	46,825		$	10,202		$	2,279		$	1,352,191
Estimated Expected Future Cash Flows Of Each PCI Loan Pool
		At December 31, 2014
		Total Non-Performing Loans
		Non-Accruing Loans
		0-29 Days Past Due				30-89 Days Past Due				90 Days or More Past Due			Total			90 Days or More Past Due and Accruing			Total Non-Performing Loans
	Loans held-for-investment:
	Real estate loans:
	Commercial
	LTV =t; 35%
	Substandard	—				395				10,769			11,164			—			11,164
	Total commercial	—				395				10,769			11,164			—			11,164
	One-to-four family residential
	LTV < 60%
	Substandard	—				190				674			864			286			1,150
	Total	—				190				674			864			286			1,150
	LTV =t; 60%
	Substandard	—				—				1,028			1,028			—			1,028
	Total	—				—				1,028			1,028			—			1,028
	Total one-to-four family residential	—				190				1,702			1,892			286			2,178
	Home equity and lines of credit
	Substandard	—				98				—			98			—			98
	Total home equity and lines of credit	—				98				—			98			—			98
	Commercial and industrial loans
	Substandard	—				—				408			408			—			408
	Total commercial and industrial loans	—				—				408			408			—			408
	Total non-performing loans held-for-investment	—				683				12,879			13,562			286			13,848
	Loans acquired:
	One-to-four family residential
	LTV < 60%
	Pass	—				—				—			—			422			422
	Substandard	—				—				313			313			—			313
	Total one-to-four family residential	—				—				313			313			422			735
	Total non-performing loans acquired	—				—				313			313			422			735
	Total non-performing loans	$	—			$	683			$	13,192		$	13,875		$	708		$	14,583
		At December 31, 2013
		Total Non-Performing Loans
		Non-Accruing Loans
		0-29 Days Past Due				30-89 Days Past Due				90 Days or More Past Due			Total			90 Days or More Past Due and Accruing			Total Non-Performing Loans
	Loans held-for-investment:
	Real estate loans:
	Commercial
	LTV =t; 35%
	Special Mention	—				—				335			335			—			335
	Substandard	3,606				421				7,836			11,863			—			11,863
	Total commercial	3,606				421				8,171			12,198			—			12,198
	One-to-four family residential
	LTV < 60%
	Special Mention	—				16				114			130			—			130
	Substandard	—				418				186			604			—			604
	Total	—				434				300			734			—			734
	LTV =t; 60%
	Substandard	—				189				993			1,182			—			1,182
	Total	—				189				993			1,182			—			1,182
	Total one-to-four family residential	—				623				1,293			1,916			—			1,916
	Construction and land
	Substandard	108				—				—			108			—			108
	Total construction and land	108				—				—			108			—			108
	Multifamily
	LTV =t; 35%
	Substandard	—				—				73			73			—			73
	Total multifamily	—				—				73			73			—			73
	Home equity and lines of credit
	Substandard	—				—				1,239			1,239			—			1,239
	Total home equity and lines of credit	—				—				1,239			1,239			—			1,239
Commercial and industrial loans
Substandard	—				—				441			441			—			441
Total commercial and industrial loans	—				—				441			441			—			441
Other loans
Pass	—				—				—			—			32			32
Total other loans	—				—				—			—			32			32
Total non-performing loans held-for-investment	$	3,714			$	1,044			$	11,217		$	15,975		$	32		$	16,007
Loans acquired:
One-to-four family residential
LTV =t; 60%
Substandard	607				—				466			1,073			—			1,073
Total one-to-four family residential	607				—				466			1,073			—			1,073
Commercial and industrial loans
LTV =t; 35%
Special Mention	—				—				252			252			—			252
Total commercial and industrial loans	—				—				252			252			—			252
Total non-performing loans acquired	607				—				718			1,325			—			1,325
Total non-performing loans	$	4,321			$	1,044			$	11,935		$	17,300		$	32		$	17,332
Detail And Delinquency Status Of Originated Loans Held-For-Investment, Net Of Deferred Fees And Costs, By Performing And Non-Performing Loans
		December 31, 2014
		Performing (Accruing) Loans
		0-29 Days Past Due				30-89 Days Past Due				Total			Non-Performing Loans			Total Loans Receivable, net
	Loans held-for-investment:
	Real estate loans:
	Commercial
	LTV < 35%
	Pass	$	47,534			$	—			$	47,534		$	—		$	47,534
	Special Mention	2,436				—				2,436			—			2,436
	Total	49,970				—				49,970			—			49,970
	LTV =t; 35%
	Pass	288,915				878				289,793			—			289,793
	Special Mention	9,792				—				9,792			—			9,792
	Substandard	25,073				5,093				30,166			11,164			41,330
	Total	323,780				5,971				329,751			11,164			340,915
	Total commercial	373,750				5,971				379,721			11,164			390,885
	One-to-four family residential
	LTV < 60%
	Pass	29,288				341				29,629			—			29,629
	Special Mention	1,143				—				1,143			—			1,143
	Substandard	867				286				1,153			1,150			2,303
	Total	31,298				627				31,925			1,150			33,075
	LTV =t; 60%
	Pass	38,062				2,465				40,527			—			40,527
	Special Mention	—				—				—			—			—
	Substandard	—				360				360			1,028			1,388
	Total	38,062				2,825				40,887			1,028			41,915
	Total one-to-four family residential	69,360				3,452				72,812			2,178			74,990
	Construction and land
	Pass	21,445				—				21,445			—			21,445
	Total construction and land	21,445				—				21,445			—			21,445
	Multifamily
	LTV < 35%
	Pass	64,692				—				64,692			—			64,692
	Special Mention	283				—				283			—			283
	Substandard	801				—				801			—			801
	Total	65,776				—				65,776			—			65,776
	LTV=gt; 35%
	Pass	999,469				239				999,708			—			999,708
	Special Mention	3,822				520				4,342			—			4,342
	Substandard	4,382				331				4,713			—			4,713
	Total	1,007,673				1,090				1,008,763			—			1,008,763
	Total multifamily	1,073,449				1,090				1,074,539			—			1,074,539
	Home equity and lines of credit
	Pass	54,800				135				54,935			—			54,935
	Special Mention	360				—				360			—			360
	Substandard	93				—				93			98			191
	Total home equity and lines of credit	55,253				135				55,388			98			55,486
	Commercial and industrial loans
	Pass	11,331				90				11,421			—			11,421
	Special Mention	652				—				652			—			652
	Substandard	479				32				511			408			919
	Total commercial and industrial loans	12,462				122				12,584			408			12,992
		December 31, 2014
		Performing (Accruing) Loans
		0-29 Days Past Due				30-89 Days Past Due				Total			Non-Performing Loans			Total Loans Receivable, net
	Other loans
	Pass	2,097				60				2,157			—			2,157
	Total other loans	2,097				60				2,157			—			2,157
	Total originated loans held-for-investment	1,607,816				10,830				1,618,646			13,848			1,632,494
	Acquired loans:
	One-to-four family residential
	LTV < 60%
Pass	225,741				526				226,267			422			226,689
Special Mention	597				—				597			—			597
Substandard	424				—				424			313			737
Total	226,762				526				227,288			735			228,023
LTV =t; 60%
Pass	5,787				375				6,162			—			6,162
Substandard	294				—				294			—			294
Total	6,081				375				6,456			—			6,456
Total one-to-four family residential	232,843				901				233,744			735			234,479
Commercial
LTV < 35%
Pass	2,477				—				2,477			—			2,477
Special Mention	187				521				708			—			708
Total	2,664				521				3,185			—			3,185
LTV =t; 35%
Pass	5,817				—				5,817			—			5,817
Substandard	2,997				—				2,997			—			2,997
Total	8,814				—				8,814			—			8,814
Total commercial	11,478				521				11,999			—			11,999
Construction and land
Substandard	363				—				363			—			363
Total construction and land	363				—				363			—			363
Multifamily
LTV < 35%
Pass	4,857				—				4,857			—			4,857
Special Mention	164				—				164			—			164
Total	5,021				—				5,021			—			5,021
LTV =t; 35%
Pass	13,457				—				13,457			—			13,457
Special Mention	366				—				366			—			366
Total	13,823				—				13,823			—			13,823
Total multifamily	18,844				—				18,844			—			18,844
Total loans acquired	263,528				1,422				264,950			735			265,685
	$	1,871,344			$	12,252			$	1,883,596		$	14,583		$	1,898,179
	December 31, 2013
	Performing (Accruing) Loans
	0-29 Days Past Due				30-89 Days Past Due				Total			Non-Performing Loans			Total Loans Receivable, net
Loans held-for-investment:
Real estate loans:
Commercial
LTV < 35%
Pass	$	42,995			$	—			$	42,995		$	—		$	42,995
Special Mention	1,304				—				1,304			—			1,304
Substandard	1,333				—				1,333			—			1,333
Total	45,632				—				45,632			—			45,632
LTV =t; 35%
Pass	239,544				928				240,472			—			240,472
Special Mention	10,927				1,676				12,603			335			12,938
Substandard	28,949				680				29,629			11,863			41,492
Total	279,420				3,284				282,704			12,198			294,902
Total commercial	325,052				3,284				328,336			12,198			340,534
One-to-four family residential
LTV < 60%
Pass	28,216				379				28,595			—			28,595
Special Mention	1,746				413				2,159			130			2,289
Substandard	269				515				784			604			1,388
Total	30,231				1,307				31,538			734			32,272
LTV =t; 60%
Pass	27,575				2,666				30,241			—			30,241
Special Mention	703				—				703			—			703
Substandard	522				369				891			1,182			2,073
Total	28,800				3,035				31,835			1,182			33,017
Total one-to-four family residential	59,031				4,342				63,373			1,916			65,289
Construction and land
Pass	13,458				—				13,458			—			13,458
Special Mention	595				—				595			—			595
Substandard	—				—				—			108			108
Total construction and land	14,053				—				14,053			108			14,161
Multifamily
LTV < 35%
Pass	40,638				328				40,966			—			40,966
Special Mention	94				215				309			—			309
Substandard	821				—				821			—			821
Total	41,553				543				42,096			—			42,096
LTV =t; 35%
Pass	817,923				—				817,923			—			817,923
Special Mention	6,751				1,115				7,866			—			7,866
Substandard	4,118				825				4,943			73			5,016
Total	828,792				1,940				830,732			73			830,805
Total multifamily	870,345				2,483				872,828			73			872,901
Home equity and lines of credit
Pass	45,116				1				45,117			—			45,117
Special Mention	376				93				469			—			469
Substandard	—				—				—			1,239			1,239
Total home equity and lines of credit	45,492				94				45,586			1,239			46,825
Commercial and industrial loans
Pass	7,415				73				7,488			—			7,488
Special Mention	962				—				962			—			962
Substandard	570				741				1,311			441			1,752
Total Commercial and industrial loans	8,947				814				9,761			441			10,202
	December 31, 2013
	Performing (Accruing) Loans
	0-29 Days Past Due				30-89 Days Past Due				Total			Non-Performing Loans			Total Loans Receivable, net
Other loans
Pass	2,226				21				2,247			32			2,279
Total other loans	2,226				21				2,247			32			2,279
Total originated loans held-for-investment	$	1,325,146			$	11,038			$	1,336,184		$	16,007		$	1,352,191
Loans acquired:
One-to-four family residential
LTV < 60%
Pass	43,112				1,195				44,307			—			44,307
Special Mention	306				104				410			—			410
Substandard	136				4				140			—			140
Total	43,554				1,303				44,857			—			44,857
LTV =t; 60%
Pass	13,838				—				13,838			—			13,838
Special Mention	232				—				232			—			232
Substandard	262				—				262			1,073			1,335
Total	14,332				—				14,332			1,073			15,405
Total one-to-four family residential	57,886				1,303				59,189			1,073			60,262
Commercial
LTV < 35%
Pass	$	2,143			$	—			2,143			$	—		2,143
Special Mention	189				—				189			—			189
Substandard	937				529				1,466			—			1,466
Total	3,269				529				3,798			—			3,798
LTV =t; 35%
Pass	8,742				461				9,203			—			9,203
Substandard	—				—				—			252			252
Total	8,742				461				9,203			252			9,455
Total commercial	12,011				990				13,001			252			13,253
Construction and land
Substandard	372				—				372			—			372
Total construction and land	372				—				372			—			372
Multifamily
LTV < 35%
Pass	588				$	—			588			$	—		588
Substandard	490				—				490			—			490
Total	1,078				—				1,078			—			1,078
LTV =t; 35%
Pass	2,262				—				2,262			—			2,262
Special Mention	590				—				590			—			590
Total	2,852				—				2,852			—			2,852
Total multifamily	3,930				—				3,930			—			3,930
Total loans acquired	74,199				2,293				76,492			1,325			77,817
	$	1,399,345			$	13,331			$	1,412,676		$	17,332		$	1,430,008
Summary Of Impaired Loans
		At December 31, 2014
		Recorded Investment				Unpaid Principal Balance				Related Allowance
	With No Allowance Recorded:
	Real estate loans:
	Commercial
	LTV =t; 35%
	Pass	3,311				3,448				—
	Substandard	12,880				14,339				—
	One-to-four family residential
	LTV < 60%
	Special Mention	138				138
	Substandard	262				262				—
	Multifamily
	LTV =t; 35%
	Pass	86				557				—
	Substandard	477				477				—
	Home Equity
	Special Mention	49				49
	Commercial and industrial loans
	Special Mention	267				268				—
	Substandard	99				99				—
	With a Related Allowance Recorded:
	Real estate loans:
	Commercial
	LTV =t; 35%
	Substandard	13,033				14,365				(2,361		)
	One-to-four family residential
	LTV =t; 60%
	Special Mention	319				319				(4		)
	Substandard	353				353				(53		)
	Multifamily
	LTV =t; 35%
	Substandard	1,427				1,427				(215		)
	Home equity and lines of credit
	Special Mention	278				278				(13		)
	Commercial and industrial loans
	Special Mention	32				32				(1		)
	Substandard	408				530				(108		)
	Total:
	Real estate loans
	Commercial	29,224				32,152				(2,361		)
	One-to-four family residential	1,072				1,072				(57		)
	Multifamily	1,990				2,461				(215		)
	Home equity and lines of credit	327				327				(13		)
	Commercial and industrial loans	806				$	929			(109		)
		$	33,419			$	36,941			$	(2,755	)
		At December 31, 2013
		Recorded Investment				Unpaid Principal Balance				Related Allowance
	With No Allowance Recorded:
	Real estate loans:
	Commercial
	LTV < 35%
	Pass	$	3,405			$	3,542			$	—
	Substandard	—				707				—
	LTV =t; 35%
	Pass	19,689				21,382				—
	Construction and land
	Substandard	108				91				—
	One-to-four family residential
	LTV < 60%
	Special Mention	507				507				—
	Substandard	269				269				—
	Multifamily
LTV < 35%
Substandard	593				1,064				—
Commercial and industrial loans
Special Mention	210				219				—
Substandard	853				1,008				—
With a Related Allowance Recorded:
Real estate loans:
Commercial
LTV =t; 35%
Special Mention	2,289				2,672				(52		)
Substandard	6,810				6,937				(2,333		)
One-to-four family residential
LTV =t; 60%
Substandard	340				340				(19		)
Multifamily
LTV =t; 35%
Substandard	1,481				1,481				(117		)
Home equity and lines of credit
Special Mention	342				342				(7		)
Substandard	1,000				1,395				—
Commercial and industrial loans
Substandard	441				485				(104		)
Total:
Real estate loans
Commercial	32,193				35,240				(2,385		)
One-to-four family residential	1,116				1,116				(19		)
Construction and land	108				91				—
Multifamily	2,074				2,545				(117		)
Home equity and lines of credit	1,342				1,737				(7		)
Commercial and industrial loans	1,504				1,712				(104		)
	$	38,337			$	42,441			$	(2,632	)
Summary Of Troubled Debt Restructuring
	Both of the relationships in the table above were restructured to receive reduced interest rates.
		Year Ended December 31, 2013
				Pre-Modification				Post-Modification
		Number of		Outstanding Recorded				Outstanding Recorded
		Relationships		Investment				Investment
		(in thousands)
	One-to-four Family
	Pass	1		$	70			$	70
	Special Mention	1		331				331
	Substandard	2		606				606
	Total Troubled Debt Restructurings	4		$	1,007			$	1,007
Detail And Delinquency Status Of Restructured Loans
		Year Ended December 31, 2013
		Number of		30-89 Days				90 Days or More
		Relationships		Past Due				Past Due
		(in thousands)
	Commercial & Industrial
	Substandard - non-accrual	1		$	—			$	441
	Total	1		—				441
	CRE
	Substandard - non-accrual	3		—				7,052
	Total	3		—				7,052
	Total	4		$	—			$	7,493

Premises_And_Equipment_Net_Tab

Premises And Equipment, Net (Tables)	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Premises And Equipment Less Accumulated Depreciation And Amortization	At December 31, 2014 and 2013, premises and equipment, less accumulated depreciation and amortization, consists of the following (in thousands):
		December 31,
		2014			2013
	At cost:
	Land	$	2,026		$	2,026
	Buildings and improvements	6,691			6,647
	Capital leases	2,600			2,600
	Furniture, fixtures, and equipment	19,658			18,969
	Leasehold improvements	26,202			26,126
		57,177			56,368
	Accumulated depreciation and amortization	(30,951		)	(27,311		)
	Premises and equipment, net	$	26,226		$	29,057

Deposits_Tables

Deposits (Tables)	12 Months Ended
	Dec. 31, 2014
Banking and Thrift [Abstract]
Deposit Account Balances	Deposit account balances are summarized as follows (dollars in thousands):
		December 31,
		2014				2013
		Amount		Weighted Average Rate		Amount			Weighted Average Rate
	Transaction:
	Negotiable orders of withdrawal	$	124,961	0.34	%	$	129,955		0.31	%
	Non-interest bearing checking	269,466		—		235,355			—
	Total transaction	394,427		0.11		365,310			0.11
	Savings:
	Money market	440,887		0.38		438,562			0.25
	Savings	432,207		0.31		380,915			0.1
	Total savings	873,094		0.35		819,477			0.18
	Certificates of deposit:
	Under $100,000	211,543		0.92		172,175			0.83
	$100,000 or more	141,601		1.4		135,727			1.39
	Total certificates of deposit	353,144		1.11		307,902			1.08
	Total deposits	$	1,620,665	0.46	%	$	1,492,689		0.35	%
Maturities Of Certificates Of Deposit	Scheduled maturities of certificates of deposit are summarized as follows (in thousands):
		December 31, 2014
	2015	$	203,288
	2016	43,439
	2017	36,909
	2018	5,116
	2019	64,284
	Thereafter	108
	Total	$	353,144
Interest Expense On Deposits	Interest expense on deposits is summarized as follows (in thousands):
		December 31,
		2014		2013			2012
	Negotiable order of withdrawal and money market	$	1,766	$	1,956		$	3,226
	Savings-passbook and statement	445		679			910
	Certificates of deposit	3,180		3,866			5,701
		$	5,391	$	6,501		$	9,837

Borrowings_Tables

Borrowings (Tables)	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Summary Of Borrowings	Borrowings consisted of securities sold under agreements to repurchase, FHLB advances, and obligations under capital leases and are summarized as follows (in thousands):
		December 31,
		2014		2013
	Repurchase agreements	$	203,200	$	181,000
	Other borrowings:
	FHLB advances	572,493		285,661
	Floating rate advances	2,058		2,485
	Obligations under capital leases	907		1,179
		$	778,658	$	470,325
Contractual Maturities Repurchase Agreements And FHLB Advances	Repurchase agreements and FHLB advances have contractual maturities as follows (in thousands):
		December 31, 2014
		FHLB		Repurchase
		Advances		Agreements
	2015	$	215,363	$	140,200
	2016	53,910		55,000
	2017	129,003		6,000
	2018	140,715		2,000
	2019	33,502		—
		$	572,493	$	203,200
Summary Of Interest Expense On Borrowings	Interest expense on borrowings is summarized as follows (in thousands):
		December 31,
		2014		2013		2012
	Repurchase agreements	$	4,161	$	6,492	$	8,573
	FHLB advances	5,717		3,836		4,071
	Floating rate advances	3		10		27
	Obligations under capital leases	80		109		136
		$	9,961	$	10,447	$	12,807

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Tax Expense (Benefit)	Income tax expense (benefit) consists of the following (in thousands):
		December 31,
		2014			2013			2012
	Federal tax expense (benefit):
	Current	$	11,195		$	12,493		$	10,081
	Deferred	(1,675		)	(2,758		)	(1,876		)
		9,520			9,735			8,205
	State and local tax expense (benefit):
	Current	1,828			2,276			1,568
	Deferred	508			(1,275		)	(857		)
		2,336			1,001			711
	Total income tax expense	$	11,856		$	10,736		$	8,916
Reconciliation Between The Amount Of Reported Total Income Tax Expense And The Amount Computed By Multiplying The Applicable Statutory Income Tax Rate	Reconciliation between the amount of reported total income tax expense and the amount computed by multiplying the applicable statutory income tax rate for the years ended December 31, 2014, 2013, and 2012, is as follows (dollars in thousands):
		December 31,
		2014			2013			2012
	Tax expense at statutory rate of 35%	$	11,242		$	10,459		$	8,731
	Increase (decrease) in taxes resulting from:
	State tax, net of federal income tax	1,519			651			462
	Bank owned life insurance	(1,366		)	(1,262		)	(1,009		)
	Merger related costs	—			—			207
	Incentive stock options	134			149			149
	Uncertain tax position	131			448			231
	Other, net	196			291			145
	Income tax expense	$	11,856		$	10,736		$	8,916
Tax Effects Of Temporary Differences That Give Rise To Significant Portions Of The Deferred Tax Assets And Deferred Tax Liabilities	The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities at December 31, 2014 and 2013, are as follows (in thousands):
		December 31,
		2014			2013
	Deferred tax assets:
	Allowance for loan losses	$	10,302		$	10,387
	Capitalized leases	369			492
	Deferred compensation	2,577			2,500
	Accrued salaries	950			737
	Postretirement benefits	523			539
	Equity awards	2,930			2,686
	Unrealized actuarial losses on post retirement benefits	226			—
	Straight-line leases adjustment	1,083			1,032
	Asset retirement obligation	100			102
	Reserve for accrued interest receivable	1,220			1,233
	Reserve for loan commitments	184			180
	Employee Stock Ownership Plan	308			241
	Other	398			493
	Depreciation	1,616			1,259
	Fair value adjustments of acquired loans	6,247			5,381
	Fair value adjustments of pension benefit obligations	306			172
	Unrealized losses securities	291			3,556
	Total gross deferred tax assets	29,630			30,990
	Deferred tax liabilities:
	Employee Stock Ownership Plan	—			—
	Unrealized actuarial gains on post retirement benefits	—			478
	Fair value adjustments of acquired securities	13			17
	Fair value adjustments of deposit liabilities	27			45
	Deferred loan fees	1,639			1,105
	Total gross deferred tax liabilities	1,679			1,645
	Net deferred tax asset	$	27,951		$	29,345
Schedule of Unrecognized Tax Benefits Roll Forward	A reconciliation of the Company’s uncertain tax positions are as follows (in thousands):
		December 31,
		2014			2013			2012
	Beginning balance	$	679		$	231		$	—
	Settlements based on tax positions related to prior years	(580		)	—			—
	Additions based on tax positions related to prior years	131			448			231
	Ending balance	$	230		$	679		$	231

Retirement_Benefits_Tables

Retirement Benefits (Tables)	12 Months Ended
	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Fair Value Of Plan Assets	The fair values of the defined benefit pension plan’s assets by asset category are as follows:
		Fair Value Measurements at December 31, 2013 Using:
		Carrying Value				Quoted Prices in Active Markets for Identical Assets (Level 1)				Significant Other Observable			Significant Unobservable
										Inputs        (Level 2)			Inputs        (Level 3)
		(in thousands)
	Assets measured on a recurring basis:
	Common / Collective Trusts - Fixed Income
	Market Duration Fixed (a)	$	1,167			$	—			$	1,167		$	—
	Mutual Funds - Fixed Income
	Intermediate Duration (b)	2,354				2,354				—			—
	Cash Equivalents - Money market	3,242				3,242				—			$	—
	Total	$	6,763			$	5,596			$	1,167		$	—
	(a)	This category consists of an index fund that tracks the Barclays Capital U.S. Aggregate Bond Index. The fund invests in Treasury, agency, corporate, mortgage-backed and asset-backed securities.
	(b)	This category consists of two funds, one containing a diversified portfolio of high-quality bonds and other fixed income securities, including U.S. Government obligations, mortgage-related and asset-backed securities, corporate and municipal bonds, CMO's, and other securities rated Baa or better. The second fund emphasizes a more globally diversified portfolio of higher-quality, intermediate-term bonds.
Other Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Funded Status And Components Of Postretirement Benefit Costs	The following tables set forth the funded status and components of postretirement benefit costs at December 31 measurement dates (in thousands):
		2014				2013				2012
	Accumulated postretirement benefit obligation beginning of year	$	1,294			$	1,778			$	1,697
	Service cost	6				9				7
	Interest cost	53				56				66
	Actuarial loss (gain)	578				(455		)		115
	Benefits paid	(85		)		(94		)		(107		)
	Accumulated postretirement benefit obligation end of year	1,846				1,294				1,778
	Accrued liability (included in accrued expenses and other liabilities)	$	1,846			$	1,294			$	1,778
Amounts Recognized In Accumulated Other Comprehensive Income (Loss)	The following table sets forth the amounts recognized in accumulated other comprehensive income (loss) (in thousands):
		December 31,
		2014				2013
	Net loss (gain)	$	473			$	(116	)
	Transition obligation	17				33
	Prior service cost	50				74
	Loss (gain) recognized in accumulated other comprehensive income	$	540			$	(9	)
Components Of Net Periodic Postretirement Benefit Cost	The following table sets forth the components of net periodic postretirement benefit costs for the years ended December 31, 2014, 2013, and 2012 (in thousands):
		December 31,
		2014				2013				2012
	Service cost	$	6			$	9			$	7
	Interest cost	53				56				66
	Amortization of transition obligation	17				17				17
	Amortization of prior service costs	24				16				15
	Amortization of unrecognized (gain) loss	(11		)		36				28
	Net postretirement benefit cost included in compensation and employee benefits	$	89			$	134			$	133
Defined Benefit Plan, Assumptions Used In Accounting For The Plan	The Company’s discount rate and rate of compensation increase used in accounting for the plan are as follows:
		2014			2013			2012
	Assumptions used to determine benefit obligation at period end:
	Discount rate	3.5	%		4.25	%		3.25	%
	Rate of increase in compensation	4	%		4	%		4	%
	Assumptions used to determine net periodic benefit cost for the year:
	Discount rate	4.25	%		3.25	%		4	%
	Rate of increase in compensation	4	%		4	%		4	%
Summary Of Percentage Point Change In Assumed Heath Care Cost Trends	A one percentage-point change in assumed heath care cost trends would have the following effects (in thousands):
		One Percentage Point Increase								One Percentage Point Decrease
		2014				2013				2014			2013
	Effect on benefits earned and interest cost	$	4			$	5			$	(3	)	$	(4	)
	Effect on accumulated postretirement benefit obligation	153				89				(135		)	(80		)
	A one percentage-point change in assumed heath care cost trends would have the following effects (in thousands):
		One Percentage Point Increase											One Percentage Point Decrease
		2014				2013				2012			2014			2013			2012
	Aggregate of service and interest	$	4			$	5			$	6		$	(3	)	$	(4	)	$	(5	)
	components of net periodic cost (benefit)
United States Pension Plans of US Entity, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Funded Status And Components Of Postretirement Benefit Costs	The following tables set forth the defined benefit pension plan's funded status and components of postretirement benefit costs at December 31, 2013, measurement dates (in thousands):
		2013
	Accumulated postretirement benefit obligation beginning of year	$	7,646
	Interest cost	225
	Actuarial gain	(1,261		)
	Benefits paid	(247		)
	Accumulated postretirement benefit obligation end of year	6,363
	Plan assets at fair value	6,763
	Net asset	$	400
Amounts Recognized In Accumulated Other Comprehensive Income (Loss)	The following table sets forth the amounts recognized in accumulated other comprehensive income (loss) (in thousands):
		2013
	Net gain recognized in accumulated other comprehensive income	$	(1,143	)
Components Of Net Periodic Postretirement Benefit Cost	The following table sets forth the components of net periodic postretirement benefit costs (in thousands):
		2013
	Interest cost	225
	Expected return on assets	(207		)
	Net postretirement benefit cost included in compensation and employee benefits	$	18
Defined Benefit Plan, Assumptions Used In Accounting For The Plan	The Company’s discount rate, long-term rate-of-return on plan assets, and amortization period are as follows:
		2013
	Assumptions used to determine benefit obligation at period end:
	Discount rate	3.75	%
	Assumptions used to determine net periodic benefit cost for the year:
	Discount rate	3	%
	Long term rate of return on plan assets	3	%
	Amortization period	8.09

Equity_Incentive_Plan_Tables

Equity Incentive Plan (Tables)	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Options Outstanding	The following table is a summary of the Company’s non-vested stock options as of December 31, 2014, and changes therein during the year then ended:
		Number of Stock Options		Weighted Average Grant Date Fair Value		Weighted Average Exercise Price		Weighted Average Contractual Life (years)
	Outstanding- December 31, 2012	2,805,912		$	2.3	$	7.09	6.07
	Granted	20,900		3.06		11.97		9.58
	Exercised	(26,507	)	2.3		7.09		—
	Outstanding- December 31, 2013	2,800,305		2.3		7.13		5.16
	Granted	2,502,600		3.91		13.13		9.45
	Forfeited	(18,000	)	3.91		13.13		—
	Exercised	(146,833	)	2.3		7.11		—
	Outstanding- December 31, 2014	5,138,072		3.08		10.04		7.44
	Exercisable- December 31, 2014	2,635,910		$	2.3	$	7.13	4.12
Status of the Company's Restricted Share Awards	The following is a summary of the status of the Company’s restricted shares as of December 31, 2014, and changes therein during the year then ended:
		Number of Shares Awarded		Weighted Average Grant Date Fair Value
	Non-vested at December 31, 2012	454,904		$	7.11
	Granted	13,300		11.97
	Vested	(225,595	)	7.1
	Forfeited	(2,526	)	7.09
	Non-vested at December 31, 2013	240,083		7.29
	Granted	1,001,200		13.13
	Vested	(228,209	)	7.16
	Forfeited	(10,000	)	13.13
	Non-vested at December 31, 2014	1,003,074		$	13.11

Commitments_And_Contingencies_

Commitments And Contingencies (Tables)	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitment And Contingent Liabilities Not Reflected In Consolidated Financial Statements
		December 31,
		2014		2013
	Commitments to extend credit	$	72,438	$	61,277
	Unused lines of credit	60,598		46,080
	Standby letters of credit	420		604
The Projected Minimum Annual Rental Payments And Receipts Under The Capitalized Leases And Operating Leases
		Rental Payments Capitalized Leases		Rental Payments Operating Leases
	Year ending December 31:
	2015	$	269	$	3,992
	2016	247		3,885
	2017	254		3,763
	2018	262		3,381
	2019	44		3,056
	Thereafter	—		27,985
	Total minimum lease payments	$	1,076	$	46,062

Regulatory_Requirements_Tables

Regulatory Requirements (Tables)	12 Months Ended
	Dec. 31, 2014
Regulatory Requirements [Abstract]
Bank's Regulatory Capital Amounts And Ratios Compared To Regulatory Requirements
		OCC Requirements
										For Well
						For Capital				Capitalized
						Adequacy				Under Prompt Corrective
		Actual				Purposes				Action Provisions
		Amount		Ratio		Amount		Ratio		Amount	Ratio
	As of December 31, 2014:
	Tangible capital to tangible assets	$	494,131	16.46	%	$	45,036	1.5	%	NA	NA
	Tier I capital (core) (to adjusted total assets)	494,131		16.46		120,096		4		150,119	5
	Total capital (to risk-weighted assets)	520,875		22.95		181,585		8		226,982	10
	As of December 31, 2013:
	Tangible capital to tangible assets	$	535,007	19.88	%	$	40,363	1.5	%	NA	NA
	Tier I capital (core) (to adjusted total assets)	535,007		19.88		107,635		4		134,544	5
	Total capital (to risk-weighted assets)	559,187		28.94		154,570		8		193,213	10

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Significant Fair Value Of Assets And Liabilities Measured On Recurring And Non Recurring Basis	The following tables summarize financial assets and financial liabilities measured at fair value as of December 31, 2014 and 2013, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value (in thousands):
		Fair Value Measurements at December 31, 2014 Using:
		Carrying Value		Quoted Prices in Active Markets for Identical Assets (Level 1)			Significant Other Observable		Significant Unobservable
							Inputs        (Level 2)		Inputs
									(Level 3)
		(in thousands)
	Measured on a recurring basis:
	Assets:
	Investment securities:
	Available-for-sale:
	Mortgage-backed securities
	GSE	$	699,790	$	—		$	699,790	$	—
	Non-GSE	1,026		—			1,026		—
	Other securities
	Corporate bonds	70,013		—			70,013		—
	Equities	410		410			—		—
	Total available-for-sale	771,239		410			770,829		—
	Trading securities	6,422		6,422			—		—
	Total	$	777,661	$	6,832		$	770,829	$	—
	Measured on a non-recurring basis:
	Assets:
	Impaired loans:
	Real estate loans:
	Commercial real estate	$	17,438	$	—		$	—	$	17,438
	One-to-four family residential mortgage	672		—			—		672
	Multifamily	1,513		—			—		1,513
	Home equity and lines of credit	278		—			—		278
	Total impaired real estate loans	19,901		—			—		19,901
	Commercial and industrial loans	440		—			—		440
	Other real estate owned	752		—			—		752
	Total	$	21,093	$	—		$	—	$	21,093
		Fair Value Measurements at December 31, 2013 Using:
		Carrying Value		Quoted Prices in Active Markets for Identical Assets (Level 1)			Significant Other Observable		Significant Unobservable
							Inputs        (Level 2)		Inputs
									(Level 3)
		(in thousands)
	Measured on a recurring basis:
	Assets:
	Investment securities:
	Available-for-sale:
	Mortgage-backed securities
	GSE	$	855,571	$	—		$	855,571	$	—
	Non-GSE	4,552		—			4,552		—
	Other securities
	Corporate bonds	76,452		—			76,452		—
	Equities	510		510			—		—
	Total available-for-sale	937,085		510			936,575		—
	Trading securities	5,998		5,998			—		—
	Total	$	943,083	$	6,508		$	936,575	$	—
	Measured on a non-recurring basis:
	Assets:
	Impaired loans:
	Real estate loans:
	Commercial real estate	$	23,572	$	—		$	—	$	23,572
	One-to-four family residential mortgage	340		—			—		340
	Construction and land	109		—			—		109
	Multifamily	1,579		—			—		1,579
	Home equity and lines of credit	1,342		—			—		1,342
	Total impaired real estate loans	26,942		—			—		26,942
	Commercial and industrial loans	616		—			—		616
	Other real estate owned	634		—			—		634
	Total	$	28,192	$	—		$	—	$	28,192
Level 3 Assets Measured At Fair Value On A Non-Recurring Basis	The following table presents qualitative information for Level 3 assets measured at fair value on a non-recurring basis at December 31, 2013:
		Fair Value		Valuation Methodology		Unobservable Inputs	Range of Inputs
		(in thousands)
	Impaired loans	$	27,558	Appraisals		Discount for costs to sell	7.00%
						Discount for quick sale	10.0% - 25.0%
				Discounted cash flows		Interest rates	4.6% - 7.5%
	Other real estate owned	$	634	Appraisals		Discount for costs to sell	7.00%
	The following table presents qualitative information for Level 3 assets measured at fair value on a non-recurring basis at December 31, 2014:
		Fair Value		Valuation Methodology		Unobservable Inputs	Range of Inputs
		(in thousands)
	Impaired loans	$	20,341	Appraisals		Discount for costs to sell	7.00%
						Discount for quick sale	10.0% - 40.0%
				Discounted cash flows		Interest rates	4.6% - 7.5%
	Other real estate owned	$	752	Appraisals		Discount for costs to sell	7.00%
Estimated Fair Values Of Significant Financial Instruments	The estimated fair values of the Company’s significant financial instruments at December 31, 2014 and 2013, are presented in the following table (in thousands):
		December 31, 2014
				Estimated Fair Value
		Carrying Value		Level 1			Level 2		Level 3		Total
	Financial assets:
	Cash and cash equivalents	$	76,709	$	76,709		$	—	$	—	$	76,709
	Trading securities	6,422		6,422			—		—		6,422
	Securities available-for-sale	771,239		410			770,829		—		771,239
	Securities held-to-maturity	3,609					3,691				3,691
	Federal Home Loan Bank of New York stock, at cost	29,219		—			29,219		—		29,219
	Net loans held-for-investment	1,942,995		—			—		1,949,511		1,949,511
	Financial liabilities:
	Deposits	$	1,620,665	$	—		$	1,622,536	$	—	$	1,622,536
	Repurchase agreements and other borrowings	778,658		—			781,196		—		781,196
	Advance payments by borrowers	7,792		—			7,792		—		7,792
		December 31, 2013
				Estimated Fair Value
		Carrying Value		Level 1			Level 2		Level 3		Total
	Financial assets:
	Cash and cash equivalents	$	61,239	$	61,239		$	—	$	—	$	61,239
	Trading securities	5,998		5,998			—		—		5,998
	Securities available-for-sale	937,085		510			936,575		—		937,085
	Federal Home Loan Bank of New York stock, at cost	17,516		—			17,516		—		17,516
	Loans held-for-sale	471		—			—		471		471
	Net loans held-for-investment	1,489,476		—			—		1,472,096		1,472,096
	Financial liabilities:
	Deposits	$	1,492,689	$	—		$	1,495,810	$	—	$	1,495,810
	Repurchase agreements and other borrowings	470,325		—			476,893		—		476,893
	Advance payments by borrowers	6,441		—			6,441		—		6,441

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Earnings Per Share Calculations And Reconciliation
		December 31,
		2014		2013		2012
	Net income available to common stockholders	$	20,266	$	19,147	$	16,031
	Weighted average shares outstanding-basic	49,006,129		54,637,680		54,339,467
	Effect of non-vested restricted stock and stock options outstanding	1,026,130		922,629		776,213
	Weighted average shares outstanding-diluted	50,032,259		55,560,309		55,115,680
	Earnings per share-basic	$	0.41	$	0.35	$	0.3
	Earnings per share-diluted	$	0.41	$	0.34	$	0.29
	Anti-dilutive shares	1,471,303		—		—

ParentOnly_Financial_Informati1

Parent-Only Financial Information (Tables) (Parent Company)	12 Months Ended
	Dec. 31, 2014
Parent Company
Condensed Balance Sheets
		December 31,
		2014			2013
		(in thousands)
	Assets
	Cash in Northfield Bank	$	53,681		$	141,331
	Interest-earning deposits in other financial institutions	2,636			224
	Investment in Northfield Bank	509,809			547,216
	ESOP loan receivable	26,934			27,799
	Other assets	1,048			80
	Total assets	$	594,108		$	716,650
	Liabilities and Stockholders' Equity
	Total liabilities	$	180		$	542
	Total stockholders' equity	593,928			716,108
	Total liabilities and stockholders' equity	$	594,108		$	716,650
Condensed Statements Of Income And Other Comprehensive (Loss) Income
		Years Ended
		December 31,
		2014			2013			2012
		(in thousands)
	Interest on ESOP loan	$	903		$	904		$	490
	Interest income on deposit in Northfield Bank	251			286			18
	Interest income on corporate bonds	—			13			157
	Gain on securities transactions, net	(2		)	—			—
	Undistributed earnings of Northfield Bank	20,331			19,157			16,360
	Total income	21,483			20,360			17,025
	Other expenses	956			1,188			1,249
	Income tax expense (benefit)	261			25			(255		)
	Total expense	1,217			1,213			994
	Net income	$	20,266		$	19,147		$	16,031
	Comprehensive income (loss):
	Net income	$	20,266		$	19,147		$	16,031
	Other comprehensive income (loss), net of tax	3,885			(22,881		)	761
	Comprehensive income (loss)	$	24,151		$	(3,734	)	$	16,792
Condensed Statements Of Cash Flows
		December 31,
		2014			2013			2012
		(in thousands)
	Cash flows from operating activities
	Net income	$	20,266		$	19,147		$	16,031
	Adjustments to reconcile net income to net cash provided by operating activities:
	Decrease in accrued interest receivable	—			94			1
	Decrease in due to Northfield Bank	—			(541		)	(704		)
	(Increase) decrease in other assets	(969		)	1,271			1,394
	Amortization of premium on corporate bond	—			—			68
	(Decrease) increase in other liabilities	(362		)	(556		)	510
	Undistributed earnings of Northfield Bank	(20,329		)	(19,157		)	(16,360		)
	Net cash (used in) provided by operating activities	(1,394		)	258			940
	Cash flows from investing activities
	Additional investment in Northfield Bank	—			(172,299		)	—
	Dividends from Northfield Bank	66,274			—			—
	Maturities of corporate bonds	—			5,173			—
	Loan to ESOP	—			(14,224		)	—
	Net cash provided by (used in) investing activities	66,274			(181,350		)	—
	Cash flows from financing activities
	Proceeds from sale of common stock	—			344,202			—
	Principal payments on ESOP loan receivable	865			950			430
	Purchase of treasury stock	(138,702		)	(3,628		)	(4,344		)
	Dividends paid	(12,884		)	(26,859		)	(1,722		)
	Merger of Northfield Bancorp, MHC	—			124			—
	Exercise of stock options	212			21			—
	Additional tax benefit on stock awards	390			296			—
	Net cash (used in) provided by financing activities	(150,119		)	315,106			(5,636		)
	Net (decrease) increase in cash and cash equivalents	(85,239		)	134,014			(4,696		)
	Cash and cash equivalents at beginning of year	141,555			7,541			12,237
	Cash and cash equivalents at end of year	$	56,316		$	141,555		$	7,541
Selected Quarterly Financial Data (Unaudited)
		2014 Quarter Ended
		31-Mar			30-Jun			30-Sep			31-Dec
		(Dollars in thousands, except per share data)
	Selected Operating Data:
	Interest income	$	22,764		$	22,151		$	22,707		24,079
	Interest expense	3,649			3,631			3,737			4,335
	Net interest income	19,115			18,520			18,970			19,744
	Provision for loan losses	417			(146		)	317			57
	Net interest income after provision for loan losses	18,698			18,666			18,653			19,687
	Other income	2,172			2,387			1,840			2,061
	Other expenses	12,063			12,698			13,268			14,013
	Income before income tax  expense	8,807			8,355			7,225			7,735
	Income tax  expense	3,588			2,915			2,496			2,857
	Net income	$	5,219		$	5,440		$	4,729		$	4,878
	Net income per common share- basic	$	0.1		$	0.11		$	0.1		$	0.11
	Net income per common share- diluted	$	0.1		$	0.11		$	0.1		$	0.11
		2013 Quarter Ended
		31-Mar			30-Jun			30-Sep			31-Dec
		(Dollars in thousands, except per share data)
	Selected Operating Data:
	Interest income	$	23,516		$	22,954		$	23,380		$	22,620
	Interest expense	4,751			4,199			4,060			3,938
	Net interest income	18,765			18,755			19,320			18,682
	Provision for loan losses	277			417			817			416
	Net interest income after provision for loan losses	18,488			18,338			18,503			18,266
	Other income	3,256			1,698			2,588			2,619
	Other expenses	14,366			13,209			13,309			12,989
	Income before income tax  expense	7,378			6,827			7,782			7,896
	Income tax  expense	2,586			2,528			2,682			2,940
	Net income	$	4,792		$	4,299		$	5,100		$	4,956
	Net income per common share- basic	$	0.09		$	0.08		$	0.09		$	0.09
	Net income per common share- diluted	$	0.09		$	0.08		$	0.09		$	0.09

Summary_Of_Significant_Account2

Summary Of Significant Accounting Policies (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 24, 2013
Schedule Of Significant Accounting Policies [Line Items]
Effect of non-vested restricted stock and stock options outstanding	1,026,130	922,629	776,213
Conversion cost	$11,500,000
Conversion ratio				1.4029
Threshold of membership investment component, percentage	0.20%
Threshold of membership investment component	1,000
Activity based investment component as a percentage of outstanding advances	4.50%
Goodwill	16,159,000	16,159,000
Employee Stock Ownership Plan (ESOP), Loan, Description	30 years
Minimum
Schedule Of Significant Accounting Policies [Line Items]
Minimum amount of non-accrual loans individually evaluated for impairment	500,000
Maximum
Schedule Of Significant Accounting Policies [Line Items]
Maximum amount of individual loans for collective evaluation for impairment	$500,000
Building
Schedule Of Significant Accounting Policies [Line Items]
Estimated useful lives of significant classes of assets	40 years
Furniture And Equipment | Minimum
Schedule Of Significant Accounting Policies [Line Items]
Estimated useful lives of significant classes of assets	5 years
Furniture And Equipment | Maximum
Schedule Of Significant Accounting Policies [Line Items]
Estimated useful lives of significant classes of assets	7 years
Software
Schedule Of Significant Accounting Policies [Line Items]
Estimated useful lives of significant classes of assets	3 years

Business_Combination_Details

Business Combination (Details) (Flatbush Federal, USD $)	Nov. 02, 2012
In Millions, except Per Share data, unless otherwise specified
Business Acquisition [Line Items]
Shares of Northfield Bancorp common stock for each share of Flatbush Federal Bancorp common stock owned	$0.47
Shareholders ownership in the combined company	3.10%
Assets acquired in business acquisitions	$136.60
Business acquired, loans	81.9
Business acquired, securities	32.7
Liabilities assumed in business acquisitions	119.2
Business acquisition, equity	17.5
Deposits
Business Acquisition [Line Items]
Liabilities assumed in business acquisitions	$110.60

Securities_AvailableForSale_Na

Securities Available-For-Sale (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Carrying value of securities available-for-sale	$13,800,000	$14,400,000
Proceeds from sale of securities available-for-sale	11,975,000	259,551,000	207,700,000
Gross realized gains on sales of securities available-for-sale	382,000	3,100,000	3,000,000
Gross realized losses on sales of securities available-for-sale	0	128,000	490,000
Impairment charges against earnings	$0	$434,000	$24,000
Equity investments-mutual funds
Schedule of Available-for-sale Securities [Line Items]
Number of securities		1	1
Continuous Unrealized Loss Position 12 Months Or Longer | Non-GSE | Real Estate Mortgage Investment Conduits (REMICs) [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of securities	2
Continuous Unrealized Loss Position 12 Months Or Longer | GSE
Schedule of Available-for-sale Securities [Line Items]
Number of securities	13
Continuous Unrealized Loss Position 12 Months Or Longer | GSE | Real Estate Mortgage Investment Conduits (REMICs) [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of securities	14
Continuous Unrealized Loss Position Less Than 12 Months | Real Estate Mortgage Investment Conduits (REMICs) [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of securities	1
Continuous Unrealized Loss Position Less Than 12 Months | GSE | Pass-through certificates
Schedule of Available-for-sale Securities [Line Items]
Number of securities	4
Continuous Unrealized Loss Position Less Than 12 Months | Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Number of securities	1

Securities_AvailableForSale_Co

Securities Available-For-Sale (Comparative Summary Of Mortgage-Backed Securities And Other 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	$771,935	$945,934
Gross unrealized gains	9,663	10,464
Gross unrealized losses	10,359	19,313
Estimated fair value	771,239	937,085
Pass-through certificates | GSE
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	292,162	366,884
Gross unrealized gains	8,309	8,573
Gross unrealized losses	1,131	5,113
Estimated fair value	299,340	370,344
REMICs
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	701,550	868,933
Gross unrealized gains	9,623	10,398
Gross unrealized losses	10,357	19,208
Estimated fair value	700,816	860,123
REMICs | GSE
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	408,328	497,575
Gross unrealized gains	1,314	1,699
Gross unrealized losses	9,192	14,047
Estimated fair value	400,450	485,227
REMICs | Non-GSE
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	1,060	4,474
Gross unrealized gains	0	126
Gross unrealized losses	34	48
Estimated fair value	1,026	4,552
Other securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	70,385	77,001
Gross unrealized gains	40	66
Gross unrealized losses	2	105
Estimated fair value	70,423	76,962
Other securities | Equity investments-mutual funds
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	410	510
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Estimated fair value	410	510
Other securities | Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	69,975	76,491
Gross unrealized gains	40	66
Gross unrealized losses	2	105
Estimated fair value	$70,013	$76,452

Securities_AvailableForSale_Su

Securities Available-For-Sale (Summary Of Expected Maturity Distribution Of Debt Securities Available-For-Sale, Other Than Mortgage-Backed Securities) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Amortized cost	$771,935	$945,934
Estimated fair value	771,239	937,085
Other Than Mortgage Backed Securities
Amortized cost, Due in one year or less	41,750
Amortized cost, Due after one year through five years	28,225
Amortized cost	69,975
Estimated fair value, Due in one year or less	41,768
Estimated fair value, Amortized cost, Due after one year through five years	28,245
Estimated fair value	$70,013

Securities_AvailableForSale_Ac

Securities Available-For-Sale (Activity Related To Credit Component Recognized In Earnings On Debt Securities) (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]
Balance, beginning of year	$0	$0	$578
Additions to the credit component on debt securities in which other-than-temporary	0	0	0
Reductions due to sales	0	0	-578
Cumulative pre-tax credit losses, end of year	$0	$0	$0

Securities_AvailableForSale_Gr

Securities Available-For-Sale (Gross Unrealized Losses On Mortgage-Backed Securities) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses, less than 12 months	$33	$18,138
Estimated Fair value, less than 12 months	13,356	479,747
Unrealized losses, 12 months or more	10,326	1,175
Estimated Fair value, 12 months or more	292,448	49,530
Unrealized losses, total	10,359	19,313
Estimated fair value, total	305,804	529,277
Pass-through certificates | GSE
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses, less than 12 months	1	5,087
Estimated Fair value, less than 12 months	181	150,473
Unrealized losses, 12 months or more	1,130	26
Estimated Fair value, 12 months or more	61,526	4,482
Unrealized losses, total	1,131	5,113
Estimated fair value, total	61,707	154,955
REMICs | GSE
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses, less than 12 months	30	12,923
Estimated Fair value, less than 12 months	3,179	283,419
Unrealized losses, 12 months or more	9,162	1,124
Estimated Fair value, 12 months or more	229,896	44,606
Unrealized losses, total	9,192	14,047
Estimated fair value, total	233,075	328,025
REMICs | Non-GSE
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses, less than 12 months	0	23
Estimated Fair value, less than 12 months	0	1,092
Unrealized losses, 12 months or more	34	25
Estimated Fair value, 12 months or more	1,026	442
Unrealized losses, total	34	48
Estimated fair value, total	1,026	1,534
Other securities | Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses, less than 12 months	2	105
Estimated Fair value, less than 12 months	9,996	44,763
Unrealized losses, total	2	105
Estimated fair value, total	$9,996	$44,763

Securities_HeldToMaturity_Deta

Securities Held-To-Maturity (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
	security
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$3,609	$0
Gross Unrealized Gains	82
Gross Unrealized Losses	0
Estimated fair value of securities held to maturity	3,691	0
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	0
Mortgage-Backed Securities, Pass-Through Certificates
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	3,609
Gross Unrealized Gains	82
Estimated fair value of securities held to maturity	$3,691

Loans_Narrative_Details

Loans (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans held for sale	$0	$471,000
Amount of loans held for sale, non-accrual		471,000
Purchased credit-impaired (PCI) loans held-for-investment, Federal Deposit Insurance Corporation assisted transaction		59,500,000
Purchased credit-impaired (PCI) loans held-for-investment	44,816,000	59,468,000
Investment in non accrual loans	13,900,000	17,800,000
Principal balance of loans on non accrual status	3,800,000
Loans held-for-sale non accrual amount	0	471,000
Impairment of loans	10,100,000	13,500,000
Loans past 90 days and still accruing	708,000	32,000
Loans with carrying balances not written down	13,100,000	21,800,000
Average original impaired loans	34,300,000	43,900,000	54,300,000
Interest income on impaired loans	2,700,000	2,000,000	2,800,000
Number of Relationships	2	4
Troubled debt restructurings	33,800,000	36,800,000
Number of Relationships		4
Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal balance of loans on non accrual status	500,000
Loans Defaulted Under Restructured Terms
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Relationships	4
Number of borrowers that subsequently defaulted	1
Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Purchase Credit Impaired Loans	33.00%	37.00%
Loan to value ratio	35.00%
Number of Relationships		3
Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Purchase Credit Impaired Loans	53.00%	47.00%
Number of Relationships		1
PCI | Non-Accruing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased credit-impaired (PCI) loans held-for-investment	$2,800,000	$3,600,000
One-to-four family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan to value ratio	60.00%

Loans_Net_Loans_HeldForInvestm

Loans (Net Loans Held-For-Investment) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Investments In Loans [Line Items]
Originated loans held-for-investment, net	$1,632,494	$1,352,191
PCI Loans	44,816	59,468
Loans acquired	265,685	77,817
Loans held-for-investment, net	1,942,995	1,489,476
Allowance for loan losses	-26,292	-26,037	-26,424	-26,836
Net loans held-for-investment	1,916,703	1,463,439
Real Estate Loans
Investments In Loans [Line Items]
Loans Receivable	1,612,827	1,336,261
Commercial and industrial loans	12,945	10,162
Other loans	2,157	2,310
Total commercial and industrial and other loans	15,102	12,472
Deferred loan cost, net	4,565	3,458
Originated loans held-for-investment, net	1,632,494	1,352,191
PCI Loans	44,816	59,468
Real Estate Loans | Multifamily
Investments In Loans [Line Items]
Loans Receivable	1,072,193	870,951
Loans held-for-investment, net	1,074,539	872,901
Allowance for loan losses	-12,219	-9,374	-7,086
Real Estate Loans | Commercial mortgage
Investments In Loans [Line Items]
Loans Receivable	390,288	340,174
Loans held-for-investment, net	390,885	340,534
Allowance for loan losses	-9,309	-12,619	-14,480
Real Estate Loans | One-to-four family residential mortgage
Investments In Loans [Line Items]
Loans Receivable	74,401	64,753
Loans held-for-investment, net	74,990	65,289
Allowance for loan losses	-951	-875	-623
Real Estate Loans | Home equity and lines of credit
Investments In Loans [Line Items]
Loans Receivable	54,533	46,231
Loans held-for-investment, net	55,486	46,825
Allowance for loan losses	-901	-860	-623
Real Estate Loans | Construction and land
Investments In Loans [Line Items]
Loans Receivable	21,412	14,152
Loans held-for-investment, net	21,445	14,161
Allowance for loan losses	-266	-205	-994
Acquired Loans
Investments In Loans [Line Items]
Loans acquired	265,685	77,817
Loans held-for-investment, net	1,942,995	1,489,476
Allowance for loan losses	-26,292	-26,037
Acquired Loans | Multifamily
Investments In Loans [Line Items]
Loans acquired	18,844	3,930
Acquired Loans | Commercial mortgage
Investments In Loans [Line Items]
Loans acquired	11,999	13,254
Acquired Loans | One-to-four family residential mortgage
Investments In Loans [Line Items]
Loans acquired	234,478	60,262
Acquired Loans | Construction and land
Investments In Loans [Line Items]
Loans acquired	$364	$371

Loans_Summary_Of_Accretable_Yi

Loans (Summary Of Accretable Yield) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Receivables [Abstract]
Balance at the beginning of year	$32,464		$43,431
Accretable yield at purchase date			0
Accretion into interest income	-4,895		-5,701
Net reclassification from non-accretable difference	374	[1]	-5,266	[1]
Balance at end of year	$27,943		$32,464
[1]	(1) Due to re-casting of cash flows for loan pools acquired in the 2011 FDIC-assisted transaction.

Loans_Activity_In_The_Allowanc

Loans (Activity In The Allowance For Loan Losses) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Receivables [Abstract]
Balance at beginning of year	$26,037	$26,424	$26,836
Provision for loan losses	645	1,927	3,536
Recoveries	402	860	245
Charge-offs	-792	-3,174	-4,193
Balance at end of year	$26,292	$26,037	$26,424

Loans_Allowance_For_Loan_Losse

Loans (Allowance For Loan Losses And The Loans Receivable By Portfolio Segment And Based On Impairment Method) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for loan losses:
Balance at beginning of year	$26,037	$26,424	$26,836
Charge-offs	-792	-3,174	-4,193
Recoveries	402	860	245
Provisions (credit)	645	1,927	3,536
Balance at end of year	26,292	26,037	26,424
Ending balance: individually evaluated for impairment	2,755	2,632
Ending balance: collectively evaluated for impairment	23,537	23,405
Loans, net:
Ending Balance	1,942,995	1,489,476
Ending balance: individually evaluated for impairment	34,274	38,337
Ending balance: collectively evaluated for impairment	1,908,721	1,451,139
Commercial and Industrial
Allowance for loan losses:
Balance at beginning of year	425	1,160
Charge-offs	-135	-379
Recoveries	8	201
Provisions (credit)	543	-557
Balance at end of year	841	425
Ending balance: individually evaluated for impairment	109	104
Ending balance: collectively evaluated for impairment	732	321
Loans, net:
Ending Balance	12,992	10,202
Ending balance: individually evaluated for impairment	806	1,504
Ending balance: collectively evaluated for impairment	12,186	8,698
Other
Allowance for loan losses:
Balance at beginning of year	67	21
Charge-offs	0	-25
Recoveries	41	73
Provisions (credit)	26	-2
Balance at end of year	134	67
Ending balance: collectively evaluated for impairment	134	67
Loans, net:
Ending Balance	2,157	2,279
Ending balance: collectively evaluated for impairment	2,157	2,279
Unallocated
Allowance for loan losses:
Balance at beginning of year	1,024	1,201
Provisions (credit)	185	-177
Balance at end of year	1,209	1,024
Ending balance: collectively evaluated for impairment	1,209	1,024
Originated Loans Total
Allowance for loan losses:
Balance at beginning of year	25,449	26,188
Charge-offs	-792	-3,174
Recoveries	402	860
Provisions (credit)	771	1,575
Balance at end of year	25,830	25,449
Ending balance: individually evaluated for impairment	2,755	2,632
Ending balance: collectively evaluated for impairment	23,075	22,817
Loans, net:
Ending Balance	1,632,494	1,352,191
Ending balance: individually evaluated for impairment	33,419	38,337
Ending balance: collectively evaluated for impairment	1,599,075	1,313,854
PCI
Allowance for loan losses:
Balance at beginning of year	588	236
Provisions (credit)	-188	352
Balance at end of year	400	588
Ending balance: collectively evaluated for impairment	400	588
Loans, net:
Ending Balance	44,816	59,468
Ending balance: collectively evaluated for impairment	44,816	59,468
Acquired Loans
Allowance for loan losses:
Balance at beginning of year	0
Provisions (credit)	62	0
Balance at end of year	62	0
Ending balance: collectively evaluated for impairment	62	0
Loans, net:
Ending Balance	265,685	77,817
Ending balance: individually evaluated for impairment	855	0
Ending balance: collectively evaluated for impairment	264,830	77,817
Real Estate Loans | Commercial mortgage
Allowance for loan losses:
Balance at beginning of year	12,619	14,480
Charge-offs	-103	-1,208
Recoveries	72	1
Provisions (credit)	-3,279	-654
Balance at end of year	9,309	12,619
Ending balance: individually evaluated for impairment	2,361	2,385
Ending balance: collectively evaluated for impairment	6,948	10,234
Loans, net:
Ending Balance	390,885	340,534
Ending balance: individually evaluated for impairment	29,224	32,194
Ending balance: collectively evaluated for impairment	361,661	308,340
Real Estate Loans | One-to-four family residential mortgage
Allowance for loan losses:
Balance at beginning of year	875	623
Charge-offs	-58	-414
Recoveries	0	18
Provisions (credit)	134	648
Balance at end of year	951	875
Ending balance: individually evaluated for impairment	57	19
Ending balance: collectively evaluated for impairment	894	856
Loans, net:
Ending Balance	74,990	65,289
Ending balance: individually evaluated for impairment	1,072	1,115
Ending balance: collectively evaluated for impairment	73,918	64,174
Real Estate Loans | Construction and land
Allowance for loan losses:
Balance at beginning of year	205	994
Recoveries	246	567
Provisions (credit)	-185	-1,356
Balance at end of year	266	205
Ending balance: collectively evaluated for impairment	266	205
Loans, net:
Ending Balance	21,445	14,161
Ending balance: individually evaluated for impairment	0	109
Ending balance: collectively evaluated for impairment	21,445	14,052
Real Estate Loans | Multifamily
Allowance for loan losses:
Balance at beginning of year	9,374	7,086
Charge-offs	-7	-657
Recoveries	35	0
Provisions (credit)	2,817	2,945
Balance at end of year	12,219	9,374
Ending balance: individually evaluated for impairment	215	117
Ending balance: collectively evaluated for impairment	12,004	9,257
Loans, net:
Ending Balance	1,074,539	872,901
Ending balance: individually evaluated for impairment	1,990	2,074
Ending balance: collectively evaluated for impairment	1,072,549	870,827
Real Estate Loans | Home equity and lines of credit
Allowance for loan losses:
Balance at beginning of year	860	623
Charge-offs	-489	-491
Provisions (credit)	530	728
Balance at end of year	901	860
Ending balance: individually evaluated for impairment	13	7
Ending balance: collectively evaluated for impairment	888	853
Loans, net:
Ending Balance	55,486	46,825
Ending balance: individually evaluated for impairment	327	1,341
Ending balance: collectively evaluated for impairment	$55,159	$45,484

Loans_Investment_Of_Originated

Loans (Investment Of Originated Loans Held-For-Investment, Net Of Deferred Fees And Costs, By Loan Type And Credit Quality Indicator) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment [Line Items]
Originated loans held-for-investment, net	$1,632,494	$1,352,191
Pass
Financing Receivable, Recorded Investment [Line Items]
Originated loans held-for-investment, net	1,561,842	1,269,534
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Originated loans held-for-investment, net	19,008	27,435
Substandard
Financing Receivable, Recorded Investment [Line Items]
Originated loans held-for-investment, net	51,644	55,222
Multifamily | Real Estate Loans | Less Than 35% LTV
Financing Receivable, Recorded Investment [Line Items]
Originated loans held-for-investment, net	65,776	42,096
Multifamily | Real Estate Loans | Greater Than or Equal to 35% LTV
Financing Receivable, Recorded Investment [Line Items]
Originated loans held-for-investment, net	1,008,763	830,805
Multifamily | Real Estate Loans | Pass | Less Than 35% LTV
Financing Receivable, Recorded Investment [Line Items]
Originated loans held-for-investment, net	64,692	40,966
Multifamily | Real Estate Loans | Pass | Greater Than or Equal to 35% LTV
Financing Receivable, Recorded Investment [Line Items]
Originated loans held-for-investment, net	999,708	817,923
Multifamily | Real Estate Loans | Special Mention | Less Than 35% LTV
Financing Receivable, Recorded Investment [Line Items]
Originated loans held-for-investment, net	283	309
Multifamily | Real Estate Loans | Special Mention | Greater Than or Equal to 35% LTV
Financing Receivable, Recorded Investment [Line Items]
Originated loans held-for-investment, net	4,342	7,866
Multifamily | Real Estate Loans | Substandard | Less Than 35% LTV
Financing Receivable, Recorded Investment [Line Items]
Originated loans held-for-investment, net	801	821
Multifamily | Real Estate Loans | Substandard | Greater Than or Equal to 35% LTV
Financing Receivable, Recorded Investment [Line Items]
Originated loans held-for-investment, net	4,713	5,016
Commercial mortgage | Real Estate Loans | Less Than 35% LTV
Financing Receivable, Recorded Investment [Line Items]
Originated loans held-for-investment, net	49,970	45,632
Commercial mortgage | Real Estate Loans | Greater Than or Equal to 35% LTV
Financing Receivable, Recorded Investment [Line Items]
Originated loans held-for-investment, net	340,915	294,902
Commercial mortgage | Real Estate Loans | Pass | Less Than 35% LTV
Financing Receivable, Recorded Investment [Line Items]
Originated loans held-for-investment, net	47,534	42,995
Commercial mortgage | Real Estate Loans | Pass | Greater Than or Equal to 35% LTV
Financing Receivable, Recorded Investment [Line Items]
Originated loans held-for-investment, net	289,794	240,472
Commercial mortgage | Real Estate Loans | Special Mention | Less Than 35% LTV
Financing Receivable, Recorded Investment [Line Items]
Originated loans held-for-investment, net	2,436	1,304
Commercial mortgage | Real Estate Loans | Special Mention | Greater Than or Equal to 35% LTV
Financing Receivable, Recorded Investment [Line Items]
Originated loans held-for-investment, net	9,792	12,938
Commercial mortgage | Real Estate Loans | Substandard | Less Than 35% LTV
Financing Receivable, Recorded Investment [Line Items]
Originated loans held-for-investment, net	0	1,333
Commercial mortgage | Real Estate Loans | Substandard | Greater Than or Equal to 35% LTV
Financing Receivable, Recorded Investment [Line Items]
Originated loans held-for-investment, net	41,329	41,492
One-to-four family residential mortgage | Real Estate Loans | Less Than 60% LTV
Financing Receivable, Recorded Investment [Line Items]
Originated loans held-for-investment, net	33,075	32,272
One-to-four family residential mortgage | Real Estate Loans | Greater than or Equal to 60% LTV
Financing Receivable, Recorded Investment [Line Items]
Originated loans held-for-investment, net	41,915	33,017
One-to-four family residential mortgage | Real Estate Loans | Pass | Less Than 60% LTV
Financing Receivable, Recorded Investment [Line Items]
Originated loans held-for-investment, net	29,629	28,595
One-to-four family residential mortgage | Real Estate Loans | Pass | Greater than or Equal to 60% LTV
Financing Receivable, Recorded Investment [Line Items]
Originated loans held-for-investment, net	40,527	30,241
One-to-four family residential mortgage | Real Estate Loans | Special Mention | Less Than 60% LTV
Financing Receivable, Recorded Investment [Line Items]
Originated loans held-for-investment, net	1,143	2,289
One-to-four family residential mortgage | Real Estate Loans | Special Mention | Greater than or Equal to 60% LTV
Financing Receivable, Recorded Investment [Line Items]
Originated loans held-for-investment, net	0	703
One-to-four family residential mortgage | Real Estate Loans | Substandard | Less Than 60% LTV
Financing Receivable, Recorded Investment [Line Items]
Originated loans held-for-investment, net	2,303	1,388
One-to-four family residential mortgage | Real Estate Loans | Substandard | Greater than or Equal to 60% LTV
Financing Receivable, Recorded Investment [Line Items]
Originated loans held-for-investment, net	1,388	2,073
Construction and land | Real Estate Loans
Financing Receivable, Recorded Investment [Line Items]
Originated loans held-for-investment, net	21,445	14,161
Construction and land | Real Estate Loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Originated loans held-for-investment, net	21,445	13,458
Construction and land | Real Estate Loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Originated loans held-for-investment, net	0	595
Construction and land | Real Estate Loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Originated loans held-for-investment, net	0	108
Home equity and lines of credit | Real Estate Loans
Financing Receivable, Recorded Investment [Line Items]
Originated loans held-for-investment, net	55,486	46,825
Home equity and lines of credit | Real Estate Loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Originated loans held-for-investment, net	54,935	45,117
Home equity and lines of credit | Real Estate Loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Originated loans held-for-investment, net	360	469
Home equity and lines of credit | Real Estate Loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Originated loans held-for-investment, net	191	1,239
Commercial and industrial loans
Financing Receivable, Recorded Investment [Line Items]
Originated loans held-for-investment, net	12,992	10,202
Commercial and industrial loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Originated loans held-for-investment, net	11,421	7,488
Commercial and industrial loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Originated loans held-for-investment, net	652	962
Commercial and industrial loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Originated loans held-for-investment, net	919	1,752
Other loans
Financing Receivable, Recorded Investment [Line Items]
Originated loans held-for-investment, net	2,157	2,279
Other loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Originated loans held-for-investment, net	2,157	2,279
Other loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Originated loans held-for-investment, net	0	0
Other loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Originated loans held-for-investment, net	$0	$0

Loans_Estimated_Expected_Futur

Loans (Estimated Expected Future Cash Flows Of Each PCI Loan Pool) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 30 to 89 Days Past Due		$0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due		7,493
Financing Receivable, Recorded Investment 90 Days or More Past Due and Accruing	708	32
Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 30 to 89 Days Past Due		0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due		441
Commercial and industrial loans | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 30 to 89 Days Past Due		0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due		441
Non-Performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	0	4,321
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	683	1,044
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	13,192	11,935
Financing Receivable, Recorded Investment Past Due, Total	13,875	17,300
Financing Receivable, Recorded Investment 90 Days or More Past Due and Accruing	708	32
Financing Receivable, Recorded Investment, Total Non-Performing Loans	14,583	17,332
Non-Performing Loans | Loans Held For Investment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	0	3,714
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	683	1,044
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	12,879	11,217
Financing Receivable, Recorded Investment Past Due, Total	13,562	15,975
Financing Receivable, Recorded Investment 90 Days or More Past Due and Accruing	286	32
Financing Receivable, Recorded Investment, Total Non-Performing Loans	13,848	16,007
Non-Performing Loans | Loans Held For Investment | Commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due		3,606
Financing Receivable, Recorded Investment 30 to 89 Days Past Due		421
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due		8,171
Financing Receivable, Recorded Investment Past Due, Total		12,198
Financing Receivable, Recorded Investment 90 Days or More Past Due and Accruing		0
Financing Receivable, Recorded Investment, Total Non-Performing Loans		12,198
Non-Performing Loans | Loans Held For Investment | Commercial mortgage | Greater Than or Equal to 35% LTV | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due		0
Financing Receivable, Recorded Investment 30 to 89 Days Past Due		0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due		335
Financing Receivable, Recorded Investment Past Due, Total		335
Financing Receivable, Recorded Investment 90 Days or More Past Due and Accruing		0
Financing Receivable, Recorded Investment, Total Non-Performing Loans		335
Non-Performing Loans | Loans Held For Investment | Commercial mortgage | Greater Than or Equal to 35% LTV | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	0	3,606
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	395	421
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	10,769	7,836
Financing Receivable, Recorded Investment Past Due, Total	11,164	11,863
Financing Receivable, Recorded Investment 90 Days or More Past Due and Accruing	0	0
Financing Receivable, Recorded Investment, Total Non-Performing Loans	11,164	11,863
Non-Performing Loans | Loans Held For Investment | One-to-four family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	0	0
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	190	623
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	1,702	1,293
Financing Receivable, Recorded Investment Past Due, Total	1,892	1,916
Financing Receivable, Recorded Investment 90 Days or More Past Due and Accruing	286	0
Financing Receivable, Recorded Investment, Total Non-Performing Loans	2,178	1,916
Non-Performing Loans | Loans Held For Investment | One-to-four family residential mortgage | Less Than 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	0	0
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	190	434
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	674	300
Financing Receivable, Recorded Investment Past Due, Total	864	734
Financing Receivable, Recorded Investment 90 Days or More Past Due and Accruing	286	0
Financing Receivable, Recorded Investment, Total Non-Performing Loans	1,150	734
Non-Performing Loans | Loans Held For Investment | One-to-four family residential mortgage | Less Than 60% LTV | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due		0
Financing Receivable, Recorded Investment 30 to 89 Days Past Due		16
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due		114
Financing Receivable, Recorded Investment Past Due, Total		130
Financing Receivable, Recorded Investment 90 Days or More Past Due and Accruing		0
Financing Receivable, Recorded Investment, Total Non-Performing Loans		130
Non-Performing Loans | Loans Held For Investment | One-to-four family residential mortgage | Less Than 60% LTV | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	0	0
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	190	418
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	674	186
Financing Receivable, Recorded Investment Past Due, Total	864	604
Financing Receivable, Recorded Investment 90 Days or More Past Due and Accruing	286	0
Financing Receivable, Recorded Investment, Total Non-Performing Loans	1,150	604
Non-Performing Loans | Loans Held For Investment | One-to-four family residential mortgage | Greater than or Equal to 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	0	0
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	0	189
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	1,028	993
Financing Receivable, Recorded Investment Past Due, Total	1,028	1,182
Financing Receivable, Recorded Investment 90 Days or More Past Due and Accruing	0	0
Financing Receivable, Recorded Investment, Total Non-Performing Loans	1,028	1,182
Non-Performing Loans | Loans Held For Investment | One-to-four family residential mortgage | Greater than or Equal to 60% LTV | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	0	0
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	0	189
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	1,028	993
Financing Receivable, Recorded Investment Past Due, Total	1,028	1,182
Financing Receivable, Recorded Investment 90 Days or More Past Due and Accruing	0	0
Financing Receivable, Recorded Investment, Total Non-Performing Loans	1,028	1,182
Non-Performing Loans | Loans Held For Investment | Construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due		108
Financing Receivable, Recorded Investment 30 to 89 Days Past Due		0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due		0
Financing Receivable, Recorded Investment Past Due, Total		108
Financing Receivable, Recorded Investment 90 Days or More Past Due and Accruing		0
Financing Receivable, Recorded Investment, Total Non-Performing Loans		108
Non-Performing Loans | Loans Held For Investment | Construction and land | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due		108
Financing Receivable, Recorded Investment 30 to 89 Days Past Due		0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due		0
Financing Receivable, Recorded Investment Past Due, Total		108
Financing Receivable, Recorded Investment 90 Days or More Past Due and Accruing		0
Non-Performing Loans | Loans Held For Investment | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due		0
Financing Receivable, Recorded Investment 30 to 89 Days Past Due		0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due		73
Financing Receivable, Recorded Investment Past Due, Total		73
Financing Receivable, Recorded Investment 90 Days or More Past Due and Accruing		0
Financing Receivable, Recorded Investment, Total Non-Performing Loans		73
Non-Performing Loans | Loans Held For Investment | Multifamily | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due		0
Financing Receivable, Recorded Investment 30 to 89 Days Past Due		0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due		73
Financing Receivable, Recorded Investment Past Due, Total		73
Financing Receivable, Recorded Investment 90 Days or More Past Due and Accruing		0
Financing Receivable, Recorded Investment, Total Non-Performing Loans		73
Non-Performing Loans | Loans Held For Investment | Home equity and lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	0	0
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	98	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	1,239
Financing Receivable, Recorded Investment Past Due, Total	98	1,239
Financing Receivable, Recorded Investment 90 Days or More Past Due and Accruing	0	0
Financing Receivable, Recorded Investment, Total Non-Performing Loans	98	1,239
Non-Performing Loans | Loans Held For Investment | Home equity and lines of credit | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	0	0
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	98	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	1,239
Financing Receivable, Recorded Investment Past Due, Total	98	1,239
Financing Receivable, Recorded Investment 90 Days or More Past Due and Accruing	0	0
Financing Receivable, Recorded Investment, Total Non-Performing Loans	98	1,239
Non-Performing Loans | Loans Held For Investment | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	0	0
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	0	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	408	441
Financing Receivable, Recorded Investment Past Due, Total	408	441
Financing Receivable, Recorded Investment 90 Days or More Past Due and Accruing	0	0
Financing Receivable, Recorded Investment, Total Non-Performing Loans	408	441
Non-Performing Loans | Loans Held For Investment | Commercial and industrial loans | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	0	0
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	0	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	408	441
Financing Receivable, Recorded Investment Past Due, Total	408	441
Financing Receivable, Recorded Investment 90 Days or More Past Due and Accruing	0	0
Financing Receivable, Recorded Investment, Total Non-Performing Loans	408	441
Non-Performing Loans | Loans Held For Investment | Other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due		0
Financing Receivable, Recorded Investment 30 to 89 Days Past Due		0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due		0
Financing Receivable, Recorded Investment Past Due, Total		0
Financing Receivable, Recorded Investment 90 Days or More Past Due and Accruing		32
Financing Receivable, Recorded Investment, Total Non-Performing Loans		32
Non-Performing Loans | Loans Held For Investment | Other loans | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due		0
Financing Receivable, Recorded Investment 30 to 89 Days Past Due		0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due		0
Financing Receivable, Recorded Investment Past Due, Total		0
Financing Receivable, Recorded Investment 90 Days or More Past Due and Accruing		32
Financing Receivable, Recorded Investment, Total Non-Performing Loans		32
Non-Performing Loans | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	0	607
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	0	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	313	718
Financing Receivable, Recorded Investment Past Due, Total	313	1,325
Financing Receivable, Recorded Investment 90 Days or More Past Due and Accruing	422	0
Financing Receivable, Recorded Investment, Total Non-Performing Loans	735	1,325
Non-Performing Loans | Acquired Loans | One-to-four family residential mortgage | Less Than 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	0
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	313
Financing Receivable, Recorded Investment Past Due, Total	313
Financing Receivable, Recorded Investment 90 Days or More Past Due and Accruing	422
Financing Receivable, Recorded Investment, Total Non-Performing Loans	735
Non-Performing Loans | Acquired Loans | One-to-four family residential mortgage | Less Than 60% LTV | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	0
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0
Financing Receivable, Recorded Investment Past Due, Total	0
Financing Receivable, Recorded Investment 90 Days or More Past Due and Accruing	422
Financing Receivable, Recorded Investment, Total Non-Performing Loans	422
Non-Performing Loans | Acquired Loans | One-to-four family residential mortgage | Less Than 60% LTV | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	0
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	313
Financing Receivable, Recorded Investment Past Due, Total	313
Financing Receivable, Recorded Investment 90 Days or More Past Due and Accruing	0
Financing Receivable, Recorded Investment, Total Non-Performing Loans	313
Non-Performing Loans | Acquired Loans | One-to-four family residential mortgage | Greater than or Equal to 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due		607
Financing Receivable, Recorded Investment 30 to 89 Days Past Due		0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due		466
Financing Receivable, Recorded Investment Past Due, Total		1,073
Financing Receivable, Recorded Investment 90 Days or More Past Due and Accruing		0
Financing Receivable, Recorded Investment, Total Non-Performing Loans		1,073
Non-Performing Loans | Acquired Loans | One-to-four family residential mortgage | Greater than or Equal to 60% LTV | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due		607
Financing Receivable, Recorded Investment 30 to 89 Days Past Due		0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due		466
Financing Receivable, Recorded Investment Past Due, Total		1,073
Financing Receivable, Recorded Investment 90 Days or More Past Due and Accruing		0
Financing Receivable, Recorded Investment, Total Non-Performing Loans		1,073
Non-Performing Loans | Acquired Loans | Commercial and industrial loans | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due		0
Financing Receivable, Recorded Investment 30 to 89 Days Past Due		0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due		252
Financing Receivable, Recorded Investment Past Due, Total		252
Financing Receivable, Recorded Investment 90 Days or More Past Due and Accruing		0
Financing Receivable, Recorded Investment, Total Non-Performing Loans		252
Non-Performing Loans | Acquired Loans | Commercial and industrial loans | Greater Than or Equal to 35% LTV | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due		0
Financing Receivable, Recorded Investment 30 to 89 Days Past Due		0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due		252
Financing Receivable, Recorded Investment Past Due, Total		252
Financing Receivable, Recorded Investment 90 Days or More Past Due and Accruing		0
Financing Receivable, Recorded Investment, Total Non-Performing Loans		$252

Loans_Detail_And_Delinquency_S

Loans (Detail And Delinquency Status Of Originated Loans Held-For-Investment, Net Of Deferred Fees And Costs, By Performing And Non-Performing Loans) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 30 to 89 Days Past Due		$0
Originated loans held-for-investment, net	1,632,494	1,352,191
Non-Performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	0	4,321
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	683	1,044
Financing Receivable, Recorded Investment Past Due, Total	13,875	17,300
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	14,583	17,332
Loans Held For Investment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	1,632,494	1,352,191
Loans Held For Investment | Performing (Accruing) Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	1,607,816	1,325,146
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	10,830	11,038
Financing Receivable, Recorded Investment Past Due, Total	1,618,646	1,336,184
Loans Held For Investment | Performing (Accruing) Loans | Special Mention | Greater than or Equal to 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	0
Loans Held For Investment | Non-Performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	13,848	16,007
Loans Held For Investment | Non-Performing Loans | Pass | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing		0
Loans Held For Investment | Non-Performing Loans | Special Mention | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing		0
Loans Held For Investment | Commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	390,885	340,534
Loans Held For Investment | Commercial mortgage | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	49,970	45,632
Loans Held For Investment | Commercial mortgage | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	340,915	294,902
Loans Held For Investment | Commercial mortgage | Pass | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	47,534	42,995
Loans Held For Investment | Commercial mortgage | Pass | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	289,793	240,472
Loans Held For Investment | Commercial mortgage | Special Mention | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	2,436	1,304
Loans Held For Investment | Commercial mortgage | Special Mention | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	9,792	12,938
Loans Held For Investment | Commercial mortgage | Substandard | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net		1,333
Loans Held For Investment | Commercial mortgage | Substandard | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	41,330	41,492
Loans Held For Investment | Commercial mortgage | Performing (Accruing) Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	373,750	325,052
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	5,971	3,284
Financing Receivable, Recorded Investment Past Due, Total	379,721	328,336
Loans Held For Investment | Commercial mortgage | Performing (Accruing) Loans | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	49,970	45,632
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	0	0
Financing Receivable, Recorded Investment Past Due, Total	49,970	45,632
Loans Held For Investment | Commercial mortgage | Performing (Accruing) Loans | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	323,780	279,420
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	5,971	3,284
Financing Receivable, Recorded Investment Past Due, Total	329,751	282,704
Loans Held For Investment | Commercial mortgage | Performing (Accruing) Loans | Pass | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	47,534	42,995
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	0	0
Financing Receivable, Recorded Investment Past Due, Total	47,534	42,995
Loans Held For Investment | Commercial mortgage | Performing (Accruing) Loans | Pass | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	288,915	239,544
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	878	928
Financing Receivable, Recorded Investment Past Due, Total	289,793	240,472
Loans Held For Investment | Commercial mortgage | Performing (Accruing) Loans | Special Mention | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	2,436	1,304
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	0	0
Financing Receivable, Recorded Investment Past Due, Total	2,436	1,304
Loans Held For Investment | Commercial mortgage | Performing (Accruing) Loans | Special Mention | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	9,792	10,927
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	0	1,676
Financing Receivable, Recorded Investment Past Due, Total	9,792	12,603
Loans Held For Investment | Commercial mortgage | Performing (Accruing) Loans | Substandard | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due		1,333
Financing Receivable, Recorded Investment 30 to 89 Days Past Due		0
Financing Receivable, Recorded Investment Past Due, Total		1,333
Loans Held For Investment | Commercial mortgage | Performing (Accruing) Loans | Substandard | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	25,073	28,949
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	5,093	680
Financing Receivable, Recorded Investment Past Due, Total	30,166	29,629
Loans Held For Investment | Commercial mortgage | Non-Performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	11,164	12,198
Loans Held For Investment | Commercial mortgage | Non-Performing Loans | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0	0
Loans Held For Investment | Commercial mortgage | Non-Performing Loans | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	11,164	12,198
Loans Held For Investment | Commercial mortgage | Non-Performing Loans | Pass | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0	0
Loans Held For Investment | Commercial mortgage | Non-Performing Loans | Pass | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0	0
Loans Held For Investment | Commercial mortgage | Non-Performing Loans | Special Mention | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0	0
Loans Held For Investment | Commercial mortgage | Non-Performing Loans | Special Mention | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0	335
Loans Held For Investment | Commercial mortgage | Non-Performing Loans | Substandard | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing		0
Loans Held For Investment | Commercial mortgage | Non-Performing Loans | Substandard | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	11,164	11,863
Loans Held For Investment | One-to-four family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	74,990	65,289
Loans Held For Investment | One-to-four family residential mortgage | Less Than 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	33,075	32,272
Loans Held For Investment | One-to-four family residential mortgage | Greater than or Equal to 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	41,915	33,017
Loans Held For Investment | One-to-four family residential mortgage | Pass | Less Than 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	29,629	28,595
Loans Held For Investment | One-to-four family residential mortgage | Pass | Greater than or Equal to 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	40,527	30,241
Loans Held For Investment | One-to-four family residential mortgage | Special Mention | Less Than 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	1,143	2,289
Loans Held For Investment | One-to-four family residential mortgage | Special Mention | Greater than or Equal to 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	0	703
Loans Held For Investment | One-to-four family residential mortgage | Substandard | Less Than 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	2,303	1,388
Loans Held For Investment | One-to-four family residential mortgage | Substandard | Greater than or Equal to 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	1,388	2,073
Loans Held For Investment | One-to-four family residential mortgage | Performing (Accruing) Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	69,360	59,031
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	3,452	4,342
Financing Receivable, Recorded Investment Past Due, Total	72,812	63,373
Loans Held For Investment | One-to-four family residential mortgage | Performing (Accruing) Loans | Less Than 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	31,298	30,231
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	627	1,307
Financing Receivable, Recorded Investment Past Due, Total	31,925	31,538
Loans Held For Investment | One-to-four family residential mortgage | Performing (Accruing) Loans | Greater than or Equal to 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	38,062	28,800
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	2,825	3,035
Financing Receivable, Recorded Investment Past Due, Total	40,887	31,835
Loans Held For Investment | One-to-four family residential mortgage | Performing (Accruing) Loans | Pass | Less Than 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	29,288	28,216
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	341	379
Financing Receivable, Recorded Investment Past Due, Total	29,629	28,595
Loans Held For Investment | One-to-four family residential mortgage | Performing (Accruing) Loans | Pass | Greater than or Equal to 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	38,062	27,575
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	2,465	2,666
Financing Receivable, Recorded Investment Past Due, Total	40,527	30,241
Loans Held For Investment | One-to-four family residential mortgage | Performing (Accruing) Loans | Special Mention | Less Than 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	1,143	1,746
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	0	413
Financing Receivable, Recorded Investment Past Due, Total	1,143	2,159
Loans Held For Investment | One-to-four family residential mortgage | Performing (Accruing) Loans | Special Mention | Greater than or Equal to 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	0	703
Financing Receivable, Recorded Investment 30 to 89 Days Past Due		0
Financing Receivable, Recorded Investment Past Due, Total	0	703
Loans Held For Investment | One-to-four family residential mortgage | Performing (Accruing) Loans | Substandard | Less Than 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	867	269
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	286	515
Financing Receivable, Recorded Investment Past Due, Total	1,153	784
Loans Held For Investment | One-to-four family residential mortgage | Performing (Accruing) Loans | Substandard | Greater than or Equal to 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	0	522
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	360	369
Financing Receivable, Recorded Investment Past Due, Total	360	891
Loans Held For Investment | One-to-four family residential mortgage | Non-Performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	2,178	1,916
Loans Held For Investment | One-to-four family residential mortgage | Non-Performing Loans | Less Than 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	1,150	734
Loans Held For Investment | One-to-four family residential mortgage | Non-Performing Loans | Greater than or Equal to 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	1,028	1,182
Loans Held For Investment | One-to-four family residential mortgage | Non-Performing Loans | Pass | Less Than 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0	0
Loans Held For Investment | One-to-four family residential mortgage | Non-Performing Loans | Pass | Greater than or Equal to 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0	0
Loans Held For Investment | One-to-four family residential mortgage | Non-Performing Loans | Special Mention | Less Than 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0	130
Loans Held For Investment | One-to-four family residential mortgage | Non-Performing Loans | Special Mention | Greater than or Equal to 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0	0
Loans Held For Investment | One-to-four family residential mortgage | Non-Performing Loans | Substandard | Less Than 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	1,150	604
Loans Held For Investment | One-to-four family residential mortgage | Non-Performing Loans | Substandard | Greater than or Equal to 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	1,028	1,182
Loans Held For Investment | Construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	21,445	14,161
Loans Held For Investment | Construction and land | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	21,445	13,458
Loans Held For Investment | Construction and land | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net		595
Loans Held For Investment | Construction and land | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net		108
Loans Held For Investment | Construction and land | Performing (Accruing) Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	21,445	14,053
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	0	0
Financing Receivable, Recorded Investment Past Due, Total	21,445	14,053
Loans Held For Investment | Construction and land | Performing (Accruing) Loans | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	21,445	13,458
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	0	0
Financing Receivable, Recorded Investment Past Due, Total	21,445	13,458
Loans Held For Investment | Construction and land | Performing (Accruing) Loans | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due		595
Financing Receivable, Recorded Investment 30 to 89 Days Past Due		0
Financing Receivable, Recorded Investment Past Due, Total		595
Loans Held For Investment | Construction and land | Performing (Accruing) Loans | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due		0
Financing Receivable, Recorded Investment 30 to 89 Days Past Due		0
Financing Receivable, Recorded Investment Past Due, Total		0
Loans Held For Investment | Construction and land | Non-Performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0	108
Loans Held For Investment | Construction and land | Non-Performing Loans | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0	0
Loans Held For Investment | Construction and land | Non-Performing Loans | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing		0
Loans Held For Investment | Construction and land | Non-Performing Loans | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing		108
Loans Held For Investment | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	1,074,539	872,901
Loans Held For Investment | Multifamily | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	65,776	42,096
Loans Held For Investment | Multifamily | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	1,008,763	830,805
Loans Held For Investment | Multifamily | Pass | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	64,692	40,966
Loans Held For Investment | Multifamily | Pass | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	999,708	817,923
Loans Held For Investment | Multifamily | Special Mention | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	283	309
Loans Held For Investment | Multifamily | Special Mention | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	4,342	7,866
Loans Held For Investment | Multifamily | Substandard | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	801	821
Loans Held For Investment | Multifamily | Substandard | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	4,713	5,016
Loans Held For Investment | Multifamily | Performing (Accruing) Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	1,073,449	870,345
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	1,090	2,483
Financing Receivable, Recorded Investment Past Due, Total	1,074,539	872,828
Loans Held For Investment | Multifamily | Performing (Accruing) Loans | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	65,776	41,553
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	0	543
Financing Receivable, Recorded Investment Past Due, Total	65,776	42,096
Loans Held For Investment | Multifamily | Performing (Accruing) Loans | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	1,007,673	828,792
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	1,090	1,940
Financing Receivable, Recorded Investment Past Due, Total	1,008,763	830,732
Loans Held For Investment | Multifamily | Performing (Accruing) Loans | Pass | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	64,692	40,638
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	0	328
Financing Receivable, Recorded Investment Past Due, Total	64,692	40,966
Loans Held For Investment | Multifamily | Performing (Accruing) Loans | Pass | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	999,469	817,923
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	239	0
Financing Receivable, Recorded Investment Past Due, Total	999,708	817,923
Loans Held For Investment | Multifamily | Performing (Accruing) Loans | Special Mention | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	283	94
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	0	215
Financing Receivable, Recorded Investment Past Due, Total	283	309
Loans Held For Investment | Multifamily | Performing (Accruing) Loans | Special Mention | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	3,822	6,751
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	520	1,115
Financing Receivable, Recorded Investment Past Due, Total	4,342	7,866
Loans Held For Investment | Multifamily | Performing (Accruing) Loans | Substandard | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	801	821
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	0	0
Financing Receivable, Recorded Investment Past Due, Total	801	821
Loans Held For Investment | Multifamily | Performing (Accruing) Loans | Substandard | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	4,382	4,118
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	331	825
Financing Receivable, Recorded Investment Past Due, Total	4,713	4,943
Loans Held For Investment | Multifamily | Non-Performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0	73
Loans Held For Investment | Multifamily | Non-Performing Loans | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0	0
Loans Held For Investment | Multifamily | Non-Performing Loans | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0	73
Loans Held For Investment | Multifamily | Non-Performing Loans | Pass | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0	0
Loans Held For Investment | Multifamily | Non-Performing Loans | Pass | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0
Loans Held For Investment | Multifamily | Non-Performing Loans | Special Mention | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0	0
Loans Held For Investment | Multifamily | Non-Performing Loans | Special Mention | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0
Loans Held For Investment | Multifamily | Non-Performing Loans | Substandard | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0	0
Loans Held For Investment | Multifamily | Non-Performing Loans | Substandard | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0	73
Loans Held For Investment | Home equity and lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	55,486	46,825
Loans Held For Investment | Home equity and lines of credit | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	54,935	45,117
Loans Held For Investment | Home equity and lines of credit | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	360	469
Loans Held For Investment | Home equity and lines of credit | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	191	1,239
Loans Held For Investment | Home equity and lines of credit | Performing (Accruing) Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	55,253	45,492
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	135	94
Financing Receivable, Recorded Investment Past Due, Total	55,388	45,586
Loans Held For Investment | Home equity and lines of credit | Performing (Accruing) Loans | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	54,800	45,116
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	135	1
Financing Receivable, Recorded Investment Past Due, Total	54,935	45,117
Loans Held For Investment | Home equity and lines of credit | Performing (Accruing) Loans | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	360	376
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	0	93
Financing Receivable, Recorded Investment Past Due, Total	360	469
Loans Held For Investment | Home equity and lines of credit | Performing (Accruing) Loans | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	93	0
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	0	0
Financing Receivable, Recorded Investment Past Due, Total	93	0
Loans Held For Investment | Home equity and lines of credit | Non-Performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	98	1,239
Loans Held For Investment | Home equity and lines of credit | Non-Performing Loans | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0	0
Loans Held For Investment | Home equity and lines of credit | Non-Performing Loans | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0	0
Loans Held For Investment | Home equity and lines of credit | Non-Performing Loans | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	98	1,239
Loans Held For Investment | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	12,992	10,202
Loans Held For Investment | Commercial and Industrial | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	11,421	7,488
Loans Held For Investment | Commercial and Industrial | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	652	962
Loans Held For Investment | Commercial and Industrial | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	919	1,752
Loans Held For Investment | Commercial and Industrial | Performing (Accruing) Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	12,462	8,947
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	122	814
Financing Receivable, Recorded Investment Past Due, Total	12,584	9,761
Loans Held For Investment | Commercial and Industrial | Performing (Accruing) Loans | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	11,331	7,415
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	90	73
Financing Receivable, Recorded Investment Past Due, Total	11,421	7,488
Loans Held For Investment | Commercial and Industrial | Performing (Accruing) Loans | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	652	962
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	0	0
Financing Receivable, Recorded Investment Past Due, Total	652	962
Loans Held For Investment | Commercial and Industrial | Performing (Accruing) Loans | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	479	570
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	32	741
Financing Receivable, Recorded Investment Past Due, Total	511	1,311
Loans Held For Investment | Commercial and Industrial | Non-Performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	408	441
Loans Held For Investment | Commercial and Industrial | Non-Performing Loans | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0	0
Loans Held For Investment | Commercial and Industrial | Non-Performing Loans | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0	0
Loans Held For Investment | Commercial and Industrial | Non-Performing Loans | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	408	441
Loans Held For Investment | Other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	2,157	2,279
Loans Held For Investment | Other loans | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	2,157	2,279
Loans Held For Investment | Other loans | Performing (Accruing) Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	2,097	2,226
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	60	21
Financing Receivable, Recorded Investment Past Due, Total	2,157	2,247
Loans Held For Investment | Other loans | Performing (Accruing) Loans | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	2,097	2,226
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	60	21
Financing Receivable, Recorded Investment Past Due, Total	2,157	2,247
Loans Held For Investment | Other loans | Non-Performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0	32
Loans Held For Investment | Other loans | Non-Performing Loans | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0	32
Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	265,685	77,817
Acquired Loans | Performing (Accruing) Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	263,528	74,199
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	1,422	2,293
Financing Receivable, Recorded Investment Past Due, Total	264,950	76,492
Acquired Loans | Non-Performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	735	1,325
Acquired Loans | Commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	11,999	13,253
Acquired Loans | Commercial mortgage | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	3,185	3,798
Acquired Loans | Commercial mortgage | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	8,814	9,455
Acquired Loans | Commercial mortgage | Pass | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	2,477	2,143
Acquired Loans | Commercial mortgage | Pass | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	5,817	9,203
Acquired Loans | Commercial mortgage | Special Mention | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	708	189
Acquired Loans | Commercial mortgage | Substandard | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net		1,466
Acquired Loans | Commercial mortgage | Substandard | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	2,997	252
Acquired Loans | Commercial mortgage | Performing (Accruing) Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	11,478	12,011
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	521	990
Financing Receivable, Recorded Investment Past Due, Total	11,999	13,001
Acquired Loans | Commercial mortgage | Performing (Accruing) Loans | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	2,664	3,269
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	521	529
Financing Receivable, Recorded Investment Past Due, Total	3,185	3,798
Acquired Loans | Commercial mortgage | Performing (Accruing) Loans | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	8,814	8,742
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	0	461
Financing Receivable, Recorded Investment Past Due, Total	8,814	9,203
Acquired Loans | Commercial mortgage | Performing (Accruing) Loans | Pass | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	2,477	2,143
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	0	0
Financing Receivable, Recorded Investment Past Due, Total	2,477	2,143
Acquired Loans | Commercial mortgage | Performing (Accruing) Loans | Pass | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	5,817	8,742
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	0	461
Financing Receivable, Recorded Investment Past Due, Total	5,817	9,203
Acquired Loans | Commercial mortgage | Performing (Accruing) Loans | Special Mention | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	187	189
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	521	0
Financing Receivable, Recorded Investment Past Due, Total	708	189
Acquired Loans | Commercial mortgage | Performing (Accruing) Loans | Substandard | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due		937
Financing Receivable, Recorded Investment 30 to 89 Days Past Due		529
Financing Receivable, Recorded Investment Past Due, Total		1,466
Acquired Loans | Commercial mortgage | Performing (Accruing) Loans | Substandard | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	2,997	0
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	0	0
Financing Receivable, Recorded Investment Past Due, Total	2,997	0
Acquired Loans | Commercial mortgage | Non-Performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0	252
Acquired Loans | Commercial mortgage | Non-Performing Loans | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0	0
Acquired Loans | Commercial mortgage | Non-Performing Loans | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0	252
Acquired Loans | Commercial mortgage | Non-Performing Loans | Pass | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0	0
Acquired Loans | Commercial mortgage | Non-Performing Loans | Pass | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0	0
Acquired Loans | Commercial mortgage | Non-Performing Loans | Special Mention | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0	0
Acquired Loans | Commercial mortgage | Non-Performing Loans | Substandard | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing		0
Acquired Loans | Commercial mortgage | Non-Performing Loans | Substandard | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0	252
Acquired Loans | One-to-four family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	234,479	60,262
Acquired Loans | One-to-four family residential mortgage | Less Than 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	228,023	44,857
Acquired Loans | One-to-four family residential mortgage | Greater than or Equal to 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	6,456	15,405
Acquired Loans | One-to-four family residential mortgage | Pass | Less Than 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	226,689	44,307
Acquired Loans | One-to-four family residential mortgage | Pass | Greater than or Equal to 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	6,162	13,838
Acquired Loans | One-to-four family residential mortgage | Special Mention | Less Than 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	597	410
Acquired Loans | One-to-four family residential mortgage | Special Mention | Greater than or Equal to 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net		232
Acquired Loans | One-to-four family residential mortgage | Substandard | Less Than 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	737	140
Acquired Loans | One-to-four family residential mortgage | Substandard | Greater than or Equal to 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	294	1,335
Acquired Loans | One-to-four family residential mortgage | Performing (Accruing) Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	232,843	57,886
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	901	1,303
Financing Receivable, Recorded Investment Past Due, Total	233,744	59,189
Acquired Loans | One-to-four family residential mortgage | Performing (Accruing) Loans | Less Than 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	226,762	43,554
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	526	1,303
Financing Receivable, Recorded Investment Past Due, Total	227,288	44,857
Acquired Loans | One-to-four family residential mortgage | Performing (Accruing) Loans | Greater than or Equal to 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	6,081	14,332
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	375	0
Financing Receivable, Recorded Investment Past Due, Total	6,456	14,332
Acquired Loans | One-to-four family residential mortgage | Performing (Accruing) Loans | Pass | Less Than 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	225,741	43,112
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	526	1,195
Financing Receivable, Recorded Investment Past Due, Total	226,267	44,307
Acquired Loans | One-to-four family residential mortgage | Performing (Accruing) Loans | Pass | Greater than or Equal to 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	5,787	13,838
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	375	0
Financing Receivable, Recorded Investment Past Due, Total	6,162	13,838
Acquired Loans | One-to-four family residential mortgage | Performing (Accruing) Loans | Special Mention | Less Than 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	597	306
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	0	104
Financing Receivable, Recorded Investment Past Due, Total	597	410
Acquired Loans | One-to-four family residential mortgage | Performing (Accruing) Loans | Special Mention | Greater than or Equal to 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due		232
Financing Receivable, Recorded Investment 30 to 89 Days Past Due		0
Financing Receivable, Recorded Investment Past Due, Total		232
Acquired Loans | One-to-four family residential mortgage | Performing (Accruing) Loans | Substandard | Less Than 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	424	136
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	0	4
Financing Receivable, Recorded Investment Past Due, Total	424	140
Acquired Loans | One-to-four family residential mortgage | Performing (Accruing) Loans | Substandard | Greater than or Equal to 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	294	262
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	0	0
Financing Receivable, Recorded Investment Past Due, Total	294	262
Acquired Loans | One-to-four family residential mortgage | Non-Performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	735	1,073
Acquired Loans | One-to-four family residential mortgage | Non-Performing Loans | Less Than 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	735	0
Acquired Loans | One-to-four family residential mortgage | Non-Performing Loans | Greater than or Equal to 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0	1,073
Acquired Loans | One-to-four family residential mortgage | Non-Performing Loans | Pass | Less Than 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	422	0
Acquired Loans | One-to-four family residential mortgage | Non-Performing Loans | Pass | Greater than or Equal to 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0	0
Acquired Loans | One-to-four family residential mortgage | Non-Performing Loans | Special Mention | Less Than 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0	0
Acquired Loans | One-to-four family residential mortgage | Non-Performing Loans | Special Mention | Greater than or Equal to 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing		0
Acquired Loans | One-to-four family residential mortgage | Non-Performing Loans | Substandard | Less Than 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	313	0
Acquired Loans | One-to-four family residential mortgage | Non-Performing Loans | Substandard | Greater than or Equal to 60% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0	1,073
Acquired Loans | Construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	363	372
Acquired Loans | Construction and land | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	363
Acquired Loans | Construction and land | Performing (Accruing) Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	363	372
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	0	0
Financing Receivable, Recorded Investment Past Due, Total	363	372
Acquired Loans | Construction and land | Performing (Accruing) Loans | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	363
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	0
Financing Receivable, Recorded Investment Past Due, Total	363
Acquired Loans | Construction and land | Non-Performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0	0
Acquired Loans | Construction and land | Non-Performing Loans | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0
Acquired Loans | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	18,844	3,930
Acquired Loans | Multifamily | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	5,021	1,078
Acquired Loans | Multifamily | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	13,823	2,852
Acquired Loans | Multifamily | Pass | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	4,857	588
Acquired Loans | Multifamily | Pass | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	13,457	2,262
Acquired Loans | Multifamily | Special Mention | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	164
Acquired Loans | Multifamily | Special Mention | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	366	590
Acquired Loans | Multifamily | Substandard | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net		490
Acquired Loans | Multifamily | Performing (Accruing) Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	18,844	3,930
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	0	0
Financing Receivable, Recorded Investment Past Due, Total	18,844	3,930
Acquired Loans | Multifamily | Performing (Accruing) Loans | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	5,021	1,078
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	0	0
Financing Receivable, Recorded Investment Past Due, Total	5,021	1,078
Acquired Loans | Multifamily | Performing (Accruing) Loans | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	13,823	2,852
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	0	0
Financing Receivable, Recorded Investment Past Due, Total	13,823	2,852
Acquired Loans | Multifamily | Performing (Accruing) Loans | Pass | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	4,857	588
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	0	0
Financing Receivable, Recorded Investment Past Due, Total	4,857	588
Acquired Loans | Multifamily | Performing (Accruing) Loans | Pass | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	13,457	2,262
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	0	0
Financing Receivable, Recorded Investment Past Due, Total	13,457	2,262
Acquired Loans | Multifamily | Performing (Accruing) Loans | Special Mention | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	164
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	0
Financing Receivable, Recorded Investment Past Due, Total	164
Acquired Loans | Multifamily | Performing (Accruing) Loans | Special Mention | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	366	590
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	0	0
Financing Receivable, Recorded Investment Past Due, Total	366	590
Acquired Loans | Multifamily | Performing (Accruing) Loans | Substandard | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due		490
Financing Receivable, Recorded Investment 30 to 89 Days Past Due		0
Financing Receivable, Recorded Investment Past Due, Total		490
Acquired Loans | Multifamily | Non-Performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0	0
Acquired Loans | Multifamily | Non-Performing Loans | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0	0
Acquired Loans | Multifamily | Non-Performing Loans | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0	0
Acquired Loans | Multifamily | Non-Performing Loans | Pass | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0	0
Acquired Loans | Multifamily | Non-Performing Loans | Pass | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0	0
Acquired Loans | Multifamily | Non-Performing Loans | Special Mention | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0
Acquired Loans | Multifamily | Non-Performing Loans | Special Mention | Greater Than or Equal to 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	0	0
Acquired Loans | Multifamily | Non-Performing Loans | Substandard | Less Than 35% LTV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing		0
Loans Acquired and Loans Originated, Loans Held For Investment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held-for-investment, net	1,898,179	1,430,008
Loans Acquired and Loans Originated, Loans Held For Investment | Performing (Accruing) Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment 0 to 29 Days Past Due	1,871,344	1,399,345
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	12,252	13,331
Financing Receivable, Recorded Investment Past Due, Total	1,883,596	1,412,676
Loans Acquired and Loans Originated, Loans Held For Investment | Non-Performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Total Non-Performing Loans and Accruing	$14,583	$17,332

Loans_Summary_Of_Impaired_Loan

Loans (Summary Of Impaired Loans) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Impaired [Line Items]
Recorded investment	$33,419	$38,337
Unpaid Principal Balance	36,941	42,441
Related Allowance	-2,755	-2,632
Special Mention | Less Than 60% LTV
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance Recorded	138
Unpaid Principal Balance With No Related Allowance Recorded	138
Commercial mortgage
Financing Receivable, Impaired [Line Items]
Recorded investment	29,224	32,193
Unpaid Principal Balance	32,152	35,240
Related Allowance	-2,361	-2,385
Commercial mortgage | Pass | Less Than 35% LTV
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance Recorded		3,405
Unpaid Principal Balance With No Related Allowance Recorded		3,542
Commercial mortgage | Pass | Greater Than or Equal to 35% LTV
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance Recorded	3,311	19,689
Unpaid Principal Balance With No Related Allowance Recorded	3,448	21,382
Commercial mortgage | Special Mention | Greater Than or Equal to 35% LTV
Financing Receivable, Impaired [Line Items]
Recorded Investment With a Related Allowance Recorded		2,289
Unpaid Principal Balance With a Related Allowance Recorded		2,672
Related Allowance With a Related Allowance Recorded		-52
Commercial mortgage | Substandard | Less Than 35% LTV
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance Recorded		0
Unpaid Principal Balance With No Related Allowance Recorded		707
Commercial mortgage | Substandard | Greater Than or Equal to 35% LTV
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance Recorded	12,880
Recorded Investment With a Related Allowance Recorded	13,033	6,810
Unpaid Principal Balance With No Related Allowance Recorded	14,339
Unpaid Principal Balance With a Related Allowance Recorded	14,365	6,937
Related Allowance With a Related Allowance Recorded	-2,361	-2,333
One-to-four family residential mortgage
Financing Receivable, Impaired [Line Items]
Recorded investment	1,072	1,116
Unpaid Principal Balance	1,072	1,116
Related Allowance	-57	-19
One-to-four family residential mortgage | Special Mention | Less Than 60% LTV
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance Recorded		507
Unpaid Principal Balance With No Related Allowance Recorded		507
One-to-four family residential mortgage | Special Mention | Greater than or Equal to 60% LTV
Financing Receivable, Impaired [Line Items]
Recorded Investment With a Related Allowance Recorded	319
Unpaid Principal Balance With a Related Allowance Recorded	319
Related Allowance With a Related Allowance Recorded	-4
One-to-four family residential mortgage | Substandard | Less Than 60% LTV
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance Recorded	262	269
Unpaid Principal Balance With No Related Allowance Recorded	262	269
One-to-four family residential mortgage | Substandard | Greater than or Equal to 60% LTV
Financing Receivable, Impaired [Line Items]
Recorded Investment With a Related Allowance Recorded	353	340
Unpaid Principal Balance With a Related Allowance Recorded	353	340
Related Allowance With a Related Allowance Recorded	-53	-19
Construction and land
Financing Receivable, Impaired [Line Items]
Recorded investment		108
Unpaid Principal Balance		91
Related Allowance		0
Construction and land | Substandard
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance Recorded		108
Unpaid Principal Balance With No Related Allowance Recorded		91
Multifamily
Financing Receivable, Impaired [Line Items]
Recorded investment	1,990	2,074
Unpaid Principal Balance	2,461	2,545
Related Allowance	-215	-117
Multifamily | Pass | Greater Than or Equal to 35% LTV
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance Recorded	86
Unpaid Principal Balance With No Related Allowance Recorded	557
Multifamily | Substandard | Less Than 35% LTV
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance Recorded		593
Unpaid Principal Balance With No Related Allowance Recorded		1,064
Multifamily | Substandard | Greater Than or Equal to 35% LTV
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance Recorded	477
Recorded Investment With a Related Allowance Recorded	1,427	1,481
Unpaid Principal Balance With No Related Allowance Recorded	477
Unpaid Principal Balance With a Related Allowance Recorded	1,427	1,481
Related Allowance With a Related Allowance Recorded	-215	-117
Home equity and lines of credit
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance Recorded	49
Unpaid Principal Balance With No Related Allowance Recorded	49
Recorded investment	327	1,342
Unpaid Principal Balance	327	1,737
Related Allowance	-13	-7
Home equity and lines of credit | Special Mention
Financing Receivable, Impaired [Line Items]
Recorded Investment With a Related Allowance Recorded	278	342
Unpaid Principal Balance With a Related Allowance Recorded	278	342
Related Allowance With a Related Allowance Recorded	-13	-7
Home equity and lines of credit | Substandard
Financing Receivable, Impaired [Line Items]
Recorded Investment With a Related Allowance Recorded		1,000
Unpaid Principal Balance With a Related Allowance Recorded		1,395
Related Allowance With a Related Allowance Recorded		0
Commercial and industrial loans
Financing Receivable, Impaired [Line Items]
Recorded investment	806	1,504
Unpaid Principal Balance	929	1,712
Related Allowance	-109	-104
Commercial and industrial loans | Special Mention
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance Recorded	267	210
Recorded Investment With a Related Allowance Recorded	32
Unpaid Principal Balance With No Related Allowance Recorded	268	219
Unpaid Principal Balance With a Related Allowance Recorded	32
Related Allowance With a Related Allowance Recorded	-1
Commercial and industrial loans | Substandard
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance Recorded	99	853
Recorded Investment With a Related Allowance Recorded	408	441
Unpaid Principal Balance With No Related Allowance Recorded	99	1,008
Unpaid Principal Balance With a Related Allowance Recorded	530	485
Related Allowance With a Related Allowance Recorded	($108)	($104)

Loans_Summary_Of_Troubled_Debt

Loans (Summary Of Troubled Debt Restructuring) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Modifications [Line Items]
Number of Relationships	2	4
Pre-Modification Outstanding Recorded Investment	$556	$1,007
Post-Modification Outstanding Recorded Investment	556	1,007
One-to-four family residential mortgage | Substandard
Financing Receivable, Modifications [Line Items]
Number of Relationships	2	2
Pre-Modification Outstanding Recorded Investment	556	606
Post-Modification Outstanding Recorded Investment	556	606
One-to-four family residential mortgage | Pass
Financing Receivable, Modifications [Line Items]
Number of Relationships		1
Pre-Modification Outstanding Recorded Investment		70
Post-Modification Outstanding Recorded Investment		70
One-to-four family residential mortgage | Special Mention
Financing Receivable, Modifications [Line Items]
Number of Relationships		1
Pre-Modification Outstanding Recorded Investment		331
Post-Modification Outstanding Recorded Investment		$331

Loans_Detail_And_Delinquency_S1

Loans (Detail And Delinquency Status Of Restructured Loans) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013
Financing Receivable, Modifications [Line Items]
Number of Relationships	4
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	$0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	7,493
Commercial and industrial loans
Financing Receivable, Modifications [Line Items]
Number of Relationships	1
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	441
Commercial and industrial loans | Substandard
Financing Receivable, Modifications [Line Items]
Number of Relationships	1
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	441
Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Number of Relationships	3
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	7,052
Commercial Real Estate | Substandard
Financing Receivable, Modifications [Line Items]
Number of Relationships	3
Financing Receivable, Recorded Investment 30 to 89 Days Past Due	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	$7,052

Premises_And_Equipment_Net_Nar

Premises And Equipment, Net (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Abstract]
Depreciation expense	$3,600,000	$3,600,000	$2,800,000
Gain on sale of premises and equipment	$0	$397,000	$0

Premises_And_Equipment_Net_Pre

Premises And Equipment, Net (Premises And Equipment Less Accumulated Depreciation And Amortization) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$57,177	$56,368
Accumulated depreciation and amortization	-30,951	-27,311
Premises and equipment, net	26,226	29,057
Land
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	2,026	2,026
Buildings and improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	6,691	6,647
Capital leases
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	2,600	2,600
Furniture, fixtures, and equipment
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	19,658	18,969
Leasehold improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$26,202	$26,126

Deposits_Narrative_Details

Deposits (Narrative) (Details) (Certificates of Deposit, USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Certificates of Deposit
Time Deposits [Line Items]
Brokered deposits	$40,900	$695

Deposits_Deposit_Account_Balan

Deposits (Deposit Account Balances) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Banking and Thrift [Abstract]
Negotiable orders of withdrawal	$124,961	$129,955
Non-interest-bearing demand	269,466	235,355
Total transactions	394,427	365,310
Money market	440,887	438,562
Savings	432,207	380,915
Total savings	873,094	819,477
Under $100,000	211,543	172,175
$100,000 or more	141,601	135,727
Total certificates of deposit	353,144	307,902
Total deposits	$1,620,665	$1,492,689
Weighted Average Rate, Negotiable orders of withdrawl	0.34%	0.31%
Weighted Average Rate, Total transactions	0.11%	0.11%
Weighted Average Rate, Money market	0.38%	0.25%
Weighted Average Rate, Savings	0.31%	0.10%
Weighted Average Rate, Total Savings	0.35%	0.18%
Weighted Average Rate, Under $100,000	0.92%	0.83%
Weighted Average Rate, $100,000 or more	1.40%	1.39%
Weighted Average Rate, Total certificates of deposit	1.11%	1.08%
Weighted Average Rate, Total deposits	0.46%	0.35%

Deposits_Maturities_Of_Certifi

Deposits (Maturities Of Certificates Of Deposit) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Banking and Thrift [Abstract]
2015	$203,288
2016	43,439
2017	36,909
2018	5,116
2019	64,284
Thereafter	108
Total certificates of deposit	$353,144	$307,902

Deposits_Interest_Expense_On_D

Deposits (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]
Negotiable order of withdrawal and money market	$1,766	$1,956	$3,226
Savings-passbook and statement	445	679	910
Certificates of deposit	3,180	3,866	5,701
Total interest expense on deposits	$5,391	$6,501	$9,837

Borrowings_Narrative_Details

Borrowings (Narrative) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2014	Mar. 31, 2014
	contract
Schedule Of Short Term And Long Term Debt [Line Items]
FHLB advances		291.3
Unencumbered securities		90.6
Multifamily loans held as collateral		229.8
Repurchase agreements
Schedule Of Short Term And Long Term Debt [Line Items]
Weighted average interest rate	2.70%	1.69%
Maturity in the first quarter of 2015		109.2
Maturity in more than 90 days		94
Interest rate			2.92%
Mortgage Backed Securities | Repurchase agreements
Schedule Of Short Term And Long Term Debt [Line Items]
Mortgage-backed securities amortized cost	192.7	213.9
Mortgage-backed securities held for sale fair value	197.9	218.3
Maturity 30 to 90 Days | Repurchase agreements
Schedule Of Short Term And Long Term Debt [Line Items]
Number of repurchase agreements	1
Maturity over 90 days | Repurchase agreements
Schedule Of Short Term And Long Term Debt [Line Items]
Maturity period	90 days	90 days

Borrowings_Summary_Of_Borrowin

Borrowings (Summary Of Borrowings) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Debt Disclosure [Abstract]
Repurchase agreements	$203,200	$181,000
Other borrowings:
FHLB advances	572,493	285,661
Floating rate advances	2,058	2,485
Obligations under capital leases	907	1,179
Total long term debt	$778,658	$470,325

Borrowings_Contractual_Maturit

Borrowings (Contractual Maturities Repurchase Agreements And FHLB Advances) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Long Term Debt Maturities Repayments Of Principal [Line Items]
Total long term debt	$778,658	$470,325
FHLB advances
Long Term Debt Maturities Repayments Of Principal [Line Items]
2015	215,363
2016	53,910
2017	129,003
2018	140,715
2019	33,502
Total long term debt	572,493
Repurchase agreements
Long Term Debt Maturities Repayments Of Principal [Line Items]
2015	140,200
2016	55,000
2017	6,000
2018	2,000
2019	0
Total long term debt	$203,200

Borrowings_Summary_Of_Interest

Borrowings (Summary Of Interest Expense On Borrowings) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest Expense [Line Items]
Interest expense	$9,961	$10,447	$12,807
FHLB advances
Interest Expense [Line Items]
Interest expense	5,717	3,836	4,071
Floating rate advances
Interest Expense [Line Items]
Interest expense	3	10	27
Obligations under capital leases
Interest Expense [Line Items]
Interest expense	80	109	136
Repurchase agreements
Interest Expense [Line Items]
Interest expense	$4,161	$6,492	$8,573

Income_Taxes_Narrative_Details

Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Line Items]
Bad debt base year reserve	$5.90	$5.90
Federal tax bad debt deferred tax liability	2.8	2.8
Flatbush Federal
Income Taxes [Line Items]
Net deferred tax assets			$1.60

Income_Taxes_Income_Tax_Expens

Income Taxes (Income Tax Expense (Benefit)) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Federal tax expense (benefit):
Current	$11,195	$12,493	$10,081
Deferred	-1,675	-2,758	-1,876
Federal tax expense (benefit)	9,520	9,735	8,205
State and local tax expense (benefit):
Current	1,828	2,276	1,568
Deferred	508	-1,275	-857
State and local tax expense (benefit)	2,336	1,001	711
Income tax expense	$11,856	$10,736	$8,916

Income_Taxes_Reconciliation_Be

Income Taxes (Reconciliation Between The Amount Of Reported Total Income Tax Expense And The Amount Computed By Multiplying The Applicable Statutory Income Tax Rate) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Tax expense at statutory rate of 35%	$11,242	$10,459	$8,731
Increase (decrease) in taxes resulting from:
State tax, net of federal income tax	1,519	651	462
Bank owned life insurance	-1,366	-1,262	-1,009
Merger related costs	0	0	207
Incentive stock options	134	149	149
Uncertain tax position	131	448	231
Other, net	196	291	145
Income tax expense	$11,856	$10,736	$8,916
Statutory Rate	35.00%	35.00%	35.00%

Income_Taxes_Tax_Effects_Of_Te

Income Taxes (Tax Effects Of Temporary Differences That Give Rise To Significant Portions Of The Deferred Tax Assets And Deferred Tax Liabilities) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Deferred tax assets:
Allowance for loan losses	$10,302	$10,387
Capitalized leases	369	492
Deferred compensation	2,577	2,500
Accrued salaries	950	737
Postretirement benefits	523	539
Equity awards	2,930	2,686
Unrealized actuarial losses on post retirement benefits	226	0
Straight-line leases adjustment	1,083	1,032
Asset retirement obligation	100	102
Reserve for accrued interest receivable	1,220	1,233
Reserve for loan commitments	184	180
Employee Stock Ownership Plan	308	241
Other	398	493
Depreciation	1,616	1,259
Fair value adjustments of acquired loans	6,247	5,381
Fair value adjustments of pension benefit obligations	306	172
Unrealized losses securities	291	3,556
Total gross deferred tax assets	29,630	30,990
Deferred tax liabilities:
Employee Stock Ownership Plan	0	0
Unrealized actuarial gains on post retirement benefits	0	478
Fair value adjustments of acquired securities	13	17
Fair value adjustments of deposit liabilities	27	45
Deferred loan fees	1,639	1,105
Total gross deferred tax liabilities	1,679	1,645
Net deferred tax asset	$27,951	$29,345

Income_Taxes_Reconciliation_Of

Income Taxes (Reconciliation Of Uncertain Tax Position) (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]
Unrecognized Tax Benefits, Beginning Balance	$679	$231	$0
Settlements based on tax positions related to prior years	-580	0	0
Additions based on tax positions related to prior years	131	448	231
Unrecognized Tax Benefits, Ending Balance	$230	$679	$231

Retirement_Benefits_Narrative_

Retirement Benefits (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2006
	payment
Defined Benefit Plan Disclosure [Line Items]
Requisite service period for employees to be eligible for 401(k) plan	3 months
Percent of employer match on employee contributions	25.00%
Percentage of Contribution from Employees of the First Base Compensation	6.00%
Percentage of Contribution from Employees of the First Base Compensation Vesting Period	5 years
Company's Contribution to Its Plan	$292,000	$266,000	$226,000
Outstanding loan balance		13,900,000
Estimated net gain that will be amortized from accumulated other comprehensive income (loss) into net periodic cost	44,000
Defined Benefit Plan, Future Amortization of Transition Obligation (Asset)	17,000
Prior service cost that will be amortized from accumulated other comprehensive income (loss) into net periodic cost	38,000
Medical cost trend rate	8.75%
Medical cost trend rate decreasing	0.50%
Medical cost trend rate ultimate rate	4.75%
Benefits paid	85,000	94,000	107,000
Benefits expected to be paid under the postretirement health benefits plan in 2015	112,000
Benefits expected to be paid under the postretirement health benefits plan in 2016	116,000
Benefits expected to be paid under the postretirement health benefits plan in 2017	120,000
Benefits expected to be paid under the postretirement health benefits plan in 2018	122,000
Benefits expected to be paid under the postretirement health benefits plan in 2019	125,000
Benefits expected to be paid under the postretirement health benefits plan in 2020 through 2024	638,000,000
Benefit plan expenses	-153,000	963,000	384,000
Number of monthly payments	120
Agreement monthly payment	17,450
Present value of agreement obligation	350,000	536,000		1,625,000
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments	937,000
Supplemental Employee Retirement Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation	6,500,000	6,000,000
Minimum
Defined Benefit Plan Disclosure [Line Items]
Percent of compensation employees can invest in 401(k) plan	2.00%
Company Matching Contributions Percentage	25.00%
Maximum
Defined Benefit Plan Disclosure [Line Items]
Percent of compensation employees can invest in 401(k) plan	15.00%
Company Matching Contributions Percentage	50.00%
First ESOP
Defined Benefit Plan Disclosure [Line Items]
Employee stock ownership plan authorized to purchase	2,463,884
Initial public offering price	$7.13
Outstanding loan balance	13,300,000	13,900,000
Shares released and allcoated to participants	80,728	81,631
ESOP compensation expense	1,700,000	1,500,000	856,000
Second ESOP
Defined Benefit Plan Disclosure [Line Items]
Employee stock ownership plan authorized to purchase	1,422,357
Initial public offering price	$10
Outstanding loan balance	13,600,000
Shares released and allcoated to participants	47,412
Supplemental ESOP
Defined Benefit Plan Disclosure [Line Items]
Company contribution to SESOP plan	$7,000	$38,000	$25,000

Retirement_Benefits_Funded_Sta

Retirement Benefits (Funded Status And Components Of Post Retirement Benefit Costs) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Net income	$20,266	$19,147	$16,031
Benefits paid	-85	-94	-107
Other Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Accumulated postretirement benefit obligation beginning of year	1,294	1,778	1,697
Service cost	6	9	7
Interest cost	53	56	66
Actuarial (gain) loss	578	-455	115
Benefits paid	-85	-94	-107
Accumulated postretirement benefit obligation end of year	1,846	1,294	1,778
Accrued liability (included in accrued expenses and other liabilities)	$1,846	$1,294	$1,778

Retirement_Benefits_Amounts_Re

Retirement Benefits (Amounts Recognized In Accumulated Other Comprehensive Income (Loss)) (Details) (Other Pension Plans, Defined Benefit, USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Other Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Net loss	$473	($116)
Transition obligation	17	33
Prior service cost	50	74
(Gain) Loss recognized in accumulated other comprehensive income	$540	($9)

Retirement_Benefits_Components

Retirement Benefits (Components Of Net Periodic Post Retirement Benefit Cost) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Future Amortization of Transition Obligation (Asset)	$17
Amortization of prior service costs	38
Other Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost	6	9	7
Interest cost	53	56	66
Defined Benefit Plan, Future Amortization of Transition Obligation (Asset)	17	17	17
Amortization of prior service costs	24	16	15
Amortization of unrecognized (gain) loss	-11	36	28
Net postretirement benefit cost included in compensation and employee benefits	$89	$134	$133

Retirement_Benefits_Defined_Be

Retirement Benefits (Defined Benefit Plan, Assumptions Used In Accounting For The Plan) (Details) (Other Pension Plans, Defined Benefit)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other Pension Plans, Defined Benefit
Assumptions used to determine benefit obligation at period end:
Discount rate	3.50%	4.25%	3.25%
Rate of increase in compensation	4.00%	4.00%	4.00%
Assumptions used to determine net periodic benefit cost for the year:
Discount rate	4.25%	3.25%	4.00%
Rate of increase in compensation	4.00%	4.00%	4.00%

Retirement_Benefits_Summary_Of

Retirement Benefits (Summary Of Percentage Point Change In Assumed Health Care Cost Trends) (Details) (Other Pension Plans, Defined Benefit, USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Aggregate of service and interest components of net periodic cost (benefit), one percentage point increase	$4	$5	$6
Aggregate of service and interest components of net periodic cost (benefit), one percentage point decrease	-3	-4	-5
Effect on accumulated postretirement benefit obligation, one percentage point increase	153	89
Effect on accumulated postretirement benefit obligation, one percentage point decrease	($135)	($80)

Retirement_Benefits_Funded_Sta1

Retirement Benefits (Funded Status And Components Of Post Retirement Benefit Costs) (Details 2) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Benefits paid	($85)	($94)	($107)
Plan assets at fair value	6,763
United States Pension Plans of US Entity, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Accumulated postretirement benefit obligation beginning of year		7,646
Interest cost		225
Actuarial (gain) loss		-1,261
Benefits paid		-247
Accumulated postretirement benefit obligation end of year		6,363
Plan assets at fair value		6,763
Net asset		$400

Retirement_Benefits_Amounts_Re1

Retirement Benefits (Amounts Recognized In Accumulated Other Comprehensive Income (Loss)) (Details 2) (United States Pension Plans of US Entity, Defined Benefit, USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
United States Pension Plans of US Entity, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Net loss	($1,143)

Retirement_Benefits_Components1

Retirement Benefits (Components Of Net Periodic Post Retirement Benefit Cost) (Details 2) (United States Pension Plans of US Entity, Defined Benefit, USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013
United States Pension Plans of US Entity, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$225
Expected return on assets	-207
Net postretirement benefit cost included in compensation and employee benefits	$18

Retirement_Benefits_Defined_Be1

Retirement Benefits (Defined Benefit Plan, Assumptions Used In Accounting For The Plan) (Details 2) (United States Pension Plans of US Entity, Defined Benefit)	12 Months Ended
	Dec. 31, 2013
United States Pension Plans of US Entity, Defined Benefit
Assumptions used to determine benefit obligation at period end:
Discount rate	3.75%
Assumptions used to determine net periodic benefit cost for the year:
Discount rate	3.00%
Long term rate of return on plan assets	3.00%
Amortization period	8 years 1 month 2 days

Retirement_Benefits_Fair_Value

Retirement Benefits (Fair Value Of Plan Assets) (Details) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$6,763
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,596
Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,167
Common / Collective Trusts - Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,167	[1]
Common / Collective Trusts - Fixed Income | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,167	[1]
Mutual Funds - Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,354	[2]
Mutual Funds - Fixed Income | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,354	[2]
Cash Equivalents - Money Market
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,242
Cash Equivalents - Money Market | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$3,242
[1]	This category consists of an index fund that tracks the Barclays Capital U.S. Aggregate Bond Index. The fund invests in Treasury, agency, corporate, mortgage-backed and asset-backed securities.
[2]	This category consists of two funds, one containing a diversified portfolio of high-quality bonds and other fixed income securities, including U.S. Government obligations, mortgage-related and asset-backed securities, corporate and municipal bonds, CMO's, and other securities rated Baa or better. The second fund emphasizes a more globally diversified portfolio of higher-quality, intermediate-term bonds.

Equity_Incentive_Plan_Narrativ

Equity Incentive Plan (Narrative) (Details) (USD $)	12 Months Ended			0 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 08, 2014	Jun. 11, 2014	Jul. 26, 2013	Jan. 30, 2010	29-May-09	Jan. 30, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted	1,001,200	13,300
Number of Stock Options Granted	2,502,600	20,900
Allocated stock-based compensation expense	$2.80	$3.20	$3
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected future stock-based compensation expense	8.7
Average period of expected future stock option expense	4 years 4 months 24 days
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected future stock-based compensation expense	$11.70
Average period of expected future stock option expense	4 years 5 months 24 days
2014 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted	1,001,200
Number of Stock Options Granted	2,502,600
Shares authorized under equity incentive plan	4,978,249
Vesting period	5 years
Expected life				6 years 6 months	6 years 6 months
Risk free return				1.81%	1.92%
Volatility				32.92%	33.83%
Dividend rate				1.68%	1.83%
2014 Equity Incentive Plan | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized under equity incentive plan	3,555,892
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years
2014 Equity Incentive Plan | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized under equity incentive plan	1,422,357
2008 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized under equity incentive plan	4,311,796
Shares available for issuance under equity incentive plan	211,530
Vesting period	5 years
Method used to estimate fair value						Black-Scholes option pricing model	Black-Scholes option pricing model	Black-Scholes option pricing model	Black-Scholes option pricing model
Expected life						6 years 6 months	6 years 6 months	6 years 6 months	6 years 6 months
Risk free return						1.39%	2.90%	2.88%	2.17%
Volatility						35.33%	38.29%	38.39%	35.33%
Dividend rate						1.98%	1.81%	1.50%	1.61%
2008 Equity Incentive Plan | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years

Equity_Incentive_Plan_Stock_Op

Equity Incentive Plan (Stock Options Outstanding) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Number of Stock Options Outstanding, Beginning Balance	2,800,305	2,805,912
Number of Stock Options Granted	2,502,600	20,900
Number of Stock Options Forfeited	-18,000
Number of Stock Options Exercised	-146,833	-26,507
Number of Stock Options Outstanding, Ending Balance	5,138,072	2,800,305	2,805,912
Number of Stock Options Exercisable	2,635,910
Weighted Average Grant Date Fair Value Outstanding, Beginning Balance	$2.30	$2.30
Weighted Average Grant Date Fair Value, Granted	$3.91	$3.06
Weighted Average Grant Date Fair Value, Forfeited	$3.91
Weighted Average Grant Date Fair Value, Exercised	$2.30	$2.30
Weighted Average Grant Date Fair Value, Outstanding, Ending Balance	$3.08	$2.30	$2.30
Weighted Average Grant Date Fair Value, Exercisable	$2.30
Weighted Average Exercise Price Outstanding, Beginning Balance	$7.13	$7.09
Weighted Average Exercise Price, Granted	$13.13	$11.97
Weighted Average Exercise Price, Forfeited	$13.13
Weighted Average Exercise Price, Exercised	$7.11	$7.09
Weighted Average Exercise Price Outstanding, Ending Balance	$10.04	$7.13	$7.09
Weighted Average Exercise Price, Exercisable	$7.13
Weighted Average Contractual Life, Outstanding	7 years 5 months 9 days	5 years 1 month 28 days	6 years 26 days
Weighted Average Contractual Life, Granted	9 years 5 months 12 days	9 years 6 months 29 days
Weighted Average Contractual Life, Exercisable	4 years 1 month 13 days

Equity_Incentive_Plan_Status_O

Equity Incentive Plan (Status Of The Company's Restricted Share Awards) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Non-vested - Beginning Balance	240,083	454,904
Granted	1,001,200	13,300
Vested	-228,209	-225,595
Forfeited	-10,000	-2,526
Non-vested - Ending Balance	1,003,074	240,083
Non-vested - Beginning Balance	$7.29	$7.11
Granted	$13.13	$11.97
Vested	$7.16	$7.10
Forfeited	$13.13	$7.09
Non-vested - Ending Balance	$13.11	$7.29

Commitments_And_Contingencies_1

Commitments And Contingencies (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]
Guarantees extend term period	1 year
Allowance for estimated losses on commitments	$472,000	$430,000
Net rental expense	$4,300,000	$4,200,000	$3,900,000
Agreements term	3 years

Commitments_And_Contingencies_2

Commitments And Contingencies (Commitment And Contingent Liabilities Not Reflected In Consolidated Financial Statements) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Commitments to extend credit
Commitments and contingent liabilities	$72,438	$61,277
Unused lines of credit
Commitments and contingent liabilities	60,598	46,080
Standby letters of credit
Commitments and contingent liabilities	$420	$604

Commitments_And_Contingencies_3

Commitments And Contingencies (The Projected Minimum Annual Rental Payments And Receipts Under The Capitalized Leases And Operating Leases) (Details) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Commitments and Contingencies Disclosure [Abstract]
Capitalized Leases, 2015	$269
Capitalized Leases, 2016	247
Capitalized Leases, 2017	254
Capitalized Leases, 2018	262
Capitalized Leases, 2019	44
Capitalized Leases, Thereafter	0
Capitalized Leases, Total minimum lease payments	1,076
Operating Leases, 2015	3,992
Operating Leases, 2016	3,885
Operating Leases, 2017	3,763
Operating Leases, 2018	3,381
Operating Leases, 2019	3,056
Operating Leases, Thereafter	27,985
Operating Leases, Total minimum lease payments	$46,062

Regulatory_Requirements_Narrat

Regulatory Requirements (Narrative) (Details)	Dec. 31, 2014	Dec. 31, 2013
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tangible capital to tangible assets, For Capital Adequacy Purposes, Ratio	1.50%	1.50%
Total capital to risk-adjusted total assets	22.95%	28.94%
Total capital (to risk-weighted assets), For Well Capitalized Under Prompt Corrective Action Provisions, Ratio	10.00%	10.00%
Minimum
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tangible capital to tangible assets, For Capital Adequacy Purposes, Ratio	1.50%
Core capital to total adjusted assets	4.00%
Total capital to risk-adjusted total assets	8.00%
Core capital ratio	5.00%
Tier 1 risk-based capital ratio	6.00%
Total capital (to risk-weighted assets), For Well Capitalized Under Prompt Corrective Action Provisions, Ratio	10.00%

Regulatory_Requirements_Banks_

Regulatory Requirements (Bank's Regulatory Capital Amounts And Ratios Compared To Regulatory Requirements) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Regulatory Requirements [Abstract]
Tangible capital to tangible assets, Actual	$494,131	$535,007
Tangible capital to tangible assets, Actual, Ratio	16.46%	19.88%
Tangible capital to tangible assets, For Capital Adequacy Purposes	45,036	40,363
Tangible capital to tangible assets, For Capital Adequacy Purposes, Ratio	1.50%	1.50%
Tier 1 capital (core) (to adjusted total assets), Actual	494,131	535,007
Tier 1 capital (core) (to adjusted total assets), Actual, Ratio	16.46%	19.88%
Tier 1 capital (core) (to adjusted total assets), For Capital Adequacy Purposes	120,096	107,635
Tier 1 capital (core) (to adjusted total assets), For Capital Adequacy Purposes, Ratio	4.00%	4.00%
Tier 1 capital (core) (to adjusted total assets), For Well Capitalized Under Prompt Corrective Action Provisions	150,119	134,544
Tier 1 capital (core) (to adjusted total assets), For Well Capitalized Under Prompt Corrective Action Provisions, Ratio	5.00%	5.00%
Total capital (to risk-weighted assets), Actual	520,875	559,187
Total capital (to risk-weighted assets), Actual, Ratio	22.95%	28.94%
Total capital (to risk-weighted assets), For Capital Adequacy Purposes	181,585	154,570
Total capital (to risk-weighted assets), For Capital Adequacy Purposes, Ratio	8.00%	8.00%
Total capital (to risk-weighted assets), For Well Capitalized Under Prompt Corrective Action Provisions	$226,982	$193,213
Total capital (to risk-weighted assets), For Well Capitalized Under Prompt Corrective Action Provisions, Ratio	10.00%	10.00%

Fair_Value_Measurements_Narrat

Fair Value Measurements (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Fair Value Disclosures [Abstract]
Transfers of securities between Level 1 and Level 2	$0
Impaired loans held-for-investment and held-for-sale with outstanding principal balances	23,700,000	31,700,000
Estimated fair value of impaired loans held-for-investment and held-for-sale	20,300,000	27,600,000
Net impairment charges	123,000	2,500,000
Net impairment charge-offs	390,000	2,300,000
Other real estate owned	752,000	634,000
Assets acquired through foreclosure, or deed in lieu of foreclosure		$634,000
Maturity period of cash and cash equivalents	three months or less
Maturity period of certificates of deposit minimum	six-months or less
Maturity period of certificates of deposit maximum	six months or greater

Fair_Value_Measurements_Fair_V

Fair Value Measurements (Fair Value, Assets And Liabilities Measured On Recurring And Nonrecurring 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]
Total available-for-sale	$771,239	$937,085
Trading securities	6,422	5,998
Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale	771,239	937,085
Trading securities	6,422	5,998
Total	777,661	943,083
Recurring Basis | GSE
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities	699,790	855,571
Recurring Basis | Non-GSE
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities	1,026	4,552
Recurring Basis | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other securities	70,013	76,452
Recurring Basis | Equities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other securities	410	510
Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	19,901	26,942
Commercial and industrial loans	440	616
Other real estate owned	752	634
Total	21,093	28,192
Level 1 | Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale	410	510
Trading securities	6,422	5,998
Total	6,832	6,508
Level 1 | Recurring Basis | Equities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other securities	410	510
Level 2 | Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale	770,829	936,575
Total	770,829	936,575
Level 2 | Recurring Basis | GSE
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities	699,790	855,571
Level 2 | Recurring Basis | Non-GSE
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities	1,026	4,552
Level 2 | Recurring Basis | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other securities	70,013	76,452
Level 3 | Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	19,901	26,942
Commercial and industrial loans	440	616
Other real estate owned	752	634
Total	21,093	28,192
Commercial Real Estate | Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	17,438	23,572
Commercial Real Estate | Level 3 | Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	17,438	23,572
One-to-four family residential mortgage | Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	672	340
One-to-four family residential mortgage | Level 3 | Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	672	340
Construction and land | Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans		109
Construction and land | Level 3 | Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans		109
Multifamily | Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	1,513	1,579
Multifamily | Level 3 | Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	1,513	1,579
Home equity and lines of credit | Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	278	1,342
Home equity and lines of credit | Level 3 | Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	$278	$1,342

Fair_Value_Measurements_Qualit

Fair Value Measurements (Qualitative Information For Level 3 Assets Measured At Fair Value On A Non-Recurring Basis) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Unobservable Inputs One | Impaired Loans
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value	$20,341	$27,558
Valuation Methodology	Appraisals	Appraisals
Unobservable Inputs	Discount for costs to sell	Discount for costs to sell
Range of Inputs	7.00%	7.00%
Unobservable Inputs One | Other Real Estate Owned
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value	$752	$634
Valuation Methodology	Appraisals	Appraisals
Unobservable Inputs	Discount for costs to sell	Discount for costs to sell
Range of Inputs	7.00%	7.00%
Unobservable Inputs Two | Impaired Loans
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Unobservable Inputs	Discount for quick sale	Discount for quick sale
Unobservable Inputs Two | Minimum | Impaired Loans
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Range of Inputs	10.00%	10.00%
Unobservable Inputs Two | Maximum | Impaired Loans
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Range of Inputs	40.00%	25.00%
Unobservable Inputs Three | Impaired Loans
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Valuation Methodology	Discounted cash flows	Discounted cash flows
Unobservable Inputs	Interest rates	Interest rates
Unobservable Inputs Three | Minimum | Impaired Loans
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Range of Inputs	4.60%	4.60%
Unobservable Inputs Three | Maximum | Impaired Loans
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Range of Inputs	7.50%	7.50%

Fair_Value_Measurements_Estima

Fair Value Measurements (Estimated Fair Values Of The Financial Instruments) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financial assets:
Trading securities	$6,422	$5,998
Total available-for-sale	771,239	937,085
Securities held-to-maturity	3,691	0
Securities held-to-maturity, (estimated fair value of $3,691 at December 31, 2014) (encumbered $2,114 at December 31, 2014)	3,609	0
Carrying Value
Financial assets:
Cash and cash equivalents	76,709	61,239
Trading securities	6,422	5,998
Total available-for-sale	771,239	937,085
Securities held-to-maturity	3,609
Federal Home Loan Bank of New York stock, at cost	29,219	17,516
Loans held-for-sale		471
Net loans held-for-investment	1,942,995	1,489,476
Financial liabilities:
Deposits	1,620,665	1,492,689
Repurchase agreements and other borrowings	778,658	470,325
Advance payments by borrowers	7,792	6,441
Estimated Fair Value
Financial assets:
Cash and cash equivalents	76,709	61,239
Trading securities	6,422	5,998
Total available-for-sale	771,239	937,085
Securities held-to-maturity	3,691
Federal Home Loan Bank of New York stock, at cost	29,219	17,516
Loans held-for-sale		471
Net loans held-for-investment	1,949,511	1,472,096
Financial liabilities:
Deposits	1,622,536	1,495,810
Repurchase agreements and other borrowings	781,196	476,893
Advance payments by borrowers	7,792	6,441
Estimated Fair Value | Level 1
Financial assets:
Cash and cash equivalents	76,709	61,239
Trading securities	6,422	5,998
Total available-for-sale	410	510
Estimated Fair Value | Level 2
Financial assets:
Total available-for-sale	770,829	936,575
Securities held-to-maturity	3,691
Federal Home Loan Bank of New York stock, at cost	29,219	17,516
Financial liabilities:
Deposits	1,622,536	1,495,810
Repurchase agreements and other borrowings	781,196	476,893
Advance payments by borrowers	7,792	6,441
Estimated Fair Value | Level 3
Financial assets:
Loans held-for-sale		471
Net loans held-for-investment	$1,949,511	$1,472,096

Stock_Repurchase_Program_Detai

Stock Repurchase Program (Details) (USD $)	Dec. 31, 2014	Jul. 31, 2013
In Millions, except Share data, unless otherwise specified
Stockholders' Equity Note [Abstract]
Stock repurchased program, authorized amount	$170
Stock repurchase program, remaining approved repurchase amount	$32.20
Shares authorized to be repurchased		300,093

Earnings_Per_Share_Details

Earnings Per Share (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]
Net income available to common stockholders	$20,266	$19,147	$16,031
Weighted average shares outstanding - basic	49,006,129	54,637,680	54,339,467
Effect of non-vested restricted stock and stock options outstanding	1,026,130	922,629	776,213
Weighted average shares outstanding-diluted	50,032,259	55,560,309	55,115,680
Earnings per share-basic	$0.41	$0.35	$0.30
Earnings per share-diluted	$0.41	$0.34	$0.29
Anti-dilutive shares	1,471,303	0	0

ParentOnly_Financial_Informati2

Parent-Only Financial Information (Condensed Balance Sheets) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
ASSETS:
Interest-earning deposits in other financial institutions	$61,742	$45,891
Other assets	36,801	37,916
Total assets	3,020,869	2,702,764
LIABILITIES AND STOCKHOLDERS’ EQUITY:
Total liabilities	2,426,941	1,986,656
Total stockholders' equity	593,928	716,108	414,873	382,650
Total liabilities and stockholders' equity	3,020,869	2,702,764
Parent Company
ASSETS:
Cash in Northfield Bank	53,681	141,331
Interest-earning deposits in other financial institutions	2,636	224
Investment in Northfield Bank	509,809	547,216
ESOP loan receivable	26,934	27,799
Other assets	1,048	80
Total assets	594,108	716,650
LIABILITIES AND STOCKHOLDERS’ EQUITY:
Total liabilities	180	542
Total stockholders' equity	593,928	716,108
Total liabilities and stockholders' equity	$594,108	$716,650

ParentOnly_Financial_Informati3

Parent-Only Financial Information (Condensed Statements Of Income And Other Comprehensive (Loss) 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 tax expense (benefit)									($11,856)	($10,736)	($8,916)
Net income									20,266	19,147	16,031
Other comprehensive income (loss), net of tax									3,885	-22,881	761
Comprehensive income (loss)									24,151	-3,734	16,792
Parent Company
Interest on ESOP loan									903	904	490
Interest income on deposit in Northfield Bank									251	286	18
Interest income on corporate bonds									0	13	157
Gain on securities transactions, net									-2	0	0
Undistributed earnings of Northfield Bank									20,331	19,157	16,360
Total income									21,483	20,360	17,025
Other expenses									-956	-1,188	-1,249
Income tax expense (benefit)	-2,857	-2,496	-2,915	-3,588	-2,940	-2,682	-2,528	-2,586	-261	-25	255
Net income	4,878	4,729	5,440	5,219	4,956	5,100	4,299	4,792	20,266	19,147	16,031
Total expense									1,217	1,213	994
Other comprehensive income (loss), net of tax									3,885	-22,881	761
Comprehensive income (loss)									$24,151	($3,734)	$16,792

ParentOnly_Financial_Informati4

Parent-Only Financial Information (Condensed Statements Of Cash Flows) (Details) (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	$20,266	$19,147	$16,031
Adjustments to reconcile net income to net cash provided by operating activities:
Decrease in accrued interest receivable	122	17	899
(Increase) decrease in other assets	-2,948	978	4,316
Cash flows from investing activities:
Maturities of corporate bonds	161,650	331,536	420,271
Cash flows from financing activities:
Proceeds from sale of common stock	0	54,648	0
Merger of Northfield Bancorp, MHC	0	124	0
Exercise of stock options	212	21	16
Additional tax benefit on stock awards	390	296	204
Net (decrease) increase in cash and cash equivalents	15,470	-67,522	63,492
Cash and cash equivalents at beginning of period	61,239	128,761	65,269
Cash and cash equivalents at end of period	76,709	61,239	128,761
Parent Company
Cash flows from operating activities:
Net income	20,266	19,147	16,031
Adjustments to reconcile net income to net cash provided by operating activities:
Decrease in accrued interest receivable	0	94	1
Decrease in due to Northfield Bank	0	-541	-704
(Increase) decrease in other assets	-969	1,271	1,394
Amortization of premium on corporate bond	0	0	68
(Decrease) increase in other liabilities	-362	-556	510
Undistributed earnings of Northfield Bank	-20,329	-19,157	-16,360
Net cash (used in) provided by operating activities	-1,394	258	940
Cash flows from investing activities:
Additional investment in Northfield Bank	0	-172,299	0
Dividends from Northfield Bank	66,274	0	0
Maturities of corporate bonds	0	5,173	0
Loan to ESOP	0	-14,224	0
Net cash provided by (used in) investing activities	66,274	-181,350	0
Cash flows from financing activities:
Proceeds from sale of common stock	0	344,202	0
Principal payments on ESOP loan receivable	865	950	430
Purchase of treasury stock	-138,702	-3,628	-4,344
Dividends paid	-12,884	-26,859	-1,722
Merger of Northfield Bancorp, MHC	0	124	0
Exercise of stock options	212	21	0
Additional tax benefit on stock awards	390	296	0
Net cash (used in) provided by financing activities	-150,119	315,106	-5,636
Net (decrease) increase in cash and cash equivalents	-85,239	134,014	-4,696
Cash and cash equivalents at beginning of period	141,555	7,541	12,237
Cash and cash equivalents at end of period	$56,316	$141,555	$7,541

ParentOnly_Financial_Informati5

Parent-Only Financial Information (Selected Quarterly Financial Data (Unaudited)) (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
Selected Operating Data:
Interest income									$91,701	$92,470	$91,539
Interest expense									15,352	16,948	22,644
Net interest income									76,349	75,522	68,895
Provision for loan losses									645	1,927	3,536
Net interest income after provision for loan losses									75,704	73,595	65,359
Other income									8,460	10,161	8,586
Other expenses									52,042	53,873	48,998
Income before income tax expense									32,122	29,883	24,947
Income tax expense									11,856	10,736	8,916
Net income									20,266	19,147	16,031
Net income per common share-basic									$0.41	$0.35	$0.30
Net income per common share-diluted									$0.41	$0.34	$0.29
Parent Company
Selected Operating Data:
Interest income	24,079	22,707	22,151	22,764	22,620	23,380	22,954	23,516
Interest expense	4,335	3,737	3,631	3,649	3,938	4,060	4,199	4,751
Net interest income	19,744	18,970	18,520	19,115	18,682	19,320	18,755	18,765
Provision for loan losses	57	317	-146	417	416	817	417	277
Net interest income after provision for loan losses	19,687	18,653	18,666	18,698	18,266	18,503	18,338	18,488
Other income	2,061	1,840	2,387	2,172	2,619	2,588	1,698	3,256
Other expenses	14,013	13,268	12,698	12,063	12,989	13,309	13,209	14,366
Income before income tax expense	7,735	7,225	8,355	8,807	7,896	7,782	6,827	7,378
Income tax expense	2,857	2,496	2,915	3,588	2,940	2,682	2,528	2,586	261	25	-255
Net income	$4,878	$4,729	$5,440	$5,219	$4,956	$5,100	$4,299	$4,792	$20,266	$19,147	$16,031
Net income per common share-basic	$0.11	$0.10	$0.11	$0.10	$0.09	$0.09	$0.08	$0.09
Net income per common share-diluted	$0.11	$0.10	$0.11	$0.10	$0.09	$0.09	$0.08	$0.09