Provident Financial Services (PFS) 10-Q 9 Nov 17 2017 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2017	Nov. 01, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q3
Trading Symbol	PFS
Entity Registrant Name	PROVIDENT FINANCIAL SERVICES INC
Entity Central Index Key	1,178,970
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		66,773,464

Consolidated Statements of Fina

Consolidated Statements of Financial Condition - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
ASSETS
Cash and due from banks	$ 97,298	$ 92,508
Short-term investments	51,485	51,789
Total cash and cash equivalents	148,783	144,297
Securities available for sale, at fair value	1,028,305	1,040,386
Investment securities held to maturity (fair value of $490,425 at September 30, 2017 (unaudited) and $489,287 at December 31, 2016)	481,845	488,183
Federal Home Loan Bank stock	70,896	75,726
Loans	7,028,052	7,003,486
Less allowance for loan losses	60,276	61,883
Net loans	6,967,776	6,941,603
Foreclosed assets, net	5,703	7,991
Banking premises and equipment, net	78,567	84,092
Accrued interest receivable	27,398	27,082
Intangible assets	420,877	422,937
Bank-owned life insurance	188,123	188,527
Other assets	76,873	79,641
Total assets	9,495,146	9,500,465
Deposits:
Demand deposits	4,880,133	4,803,426
Savings deposits	1,083,215	1,099,020
Certificates of deposit of $100,000 or more	296,172	290,295
Other time deposits	331,696	360,888
Total deposits	6,591,216	6,553,629
Mortgage escrow deposits	25,186	24,452
Borrowed funds	1,525,560	1,612,745
Other liabilities	53,012	57,858
Total liabilities	8,194,974	8,248,684
Stockholders’ Equity:
Preferred stock, $0.01 par value, 50,000,000 shares authorized, none issued	0	0
Common stock, $0.01 par value, 200,000,000 shares authorized, 83,209,293 shares issued and 66,467,819 shares outstanding at September 30, 2017 and 66,082,283 outstanding at December 31, 2016	832	832
Additional paid-in capital	1,010,247	1,005,777
Retained earnings	586,575	550,768
Accumulated other comprehensive loss	(708)	(3,397)
Treasury stock	(260,910)	(264,221)
Unallocated common stock held by the Employee Stock Ownership Plan	(35,864)	(37,978)
Common stock acquired by the Directors’ Deferred Fee Plan	(5,343)	(5,846)
Deferred compensation – Directors’ Deferred Fee Plan	5,343	5,846
Total stockholders’ equity	1,300,172	1,251,781
Total liabilities and stockholders’ equity	$ 9,495,146	$ 9,500,465

Consolidated Statements of Fin3

Consolidated Statements of Financial Condition (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Investment securities held to maturity, fair value	$ 490,425	$ 489,287
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	50,000,000	50,000,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares issued (in shares)	83,209,293	83,209,293
Common stock, shares outstanding (in shares)	66,467,819	66,082,283

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Interest income:
Real estate secured loans	$ 47,692	$ 45,262	$ 140,712	$ 134,411
Commercial loans	18,964	16,093	53,884	46,419
Consumer loans	5,083	5,627	15,293	16,657
Securities available for sale and Federal Home Loan Bank Stock	6,540	5,576	19,651	17,074
Investment securities held to maturity	3,272	3,349	9,812	10,011
Deposits, Federal funds sold and other short-term investments	343	138	898	252
Total interest income	81,894	76,045	240,250	224,824
Interest expense:
Deposits	4,988	4,441	14,093	12,397
Borrowed funds	6,694	6,633	19,855	20,477
Total interest expense	11,682	11,074	33,948	32,874
Net interest income	70,212	64,971	206,302	191,950
Provision for loan losses	500	1,000	3,700	4,200
Net interest income after provision for loan losses	69,712	63,971	202,602	187,750
Non-interest income:
Fees	7,680	6,137	20,940	19,309
Wealth management income	4,592	4,262	13,314	13,084
Bank-owned life insurance	1,353	1,382	5,291	4,083
Net gain (loss) on securities transactions	36	(43)	47	54
Other income	1,451	2,328	2,804	4,378
Total non-interest income	15,112	14,066	42,396	40,908
Non-interest expense:
Compensation and employee benefits	27,328	26,725	81,086	78,496
Net occupancy expense	6,105	6,227	19,255	18,729
Data processing expense	3,314	3,328	10,302	9,845
FDIC insurance	967	1,117	3,065	3,732
Amortization of intangibles	632	767	2,079	2,628
Advertising and promotion expense	907	787	2,709	2,567
Other operating expenses	7,027	6,899	21,248	20,628
Total non-interest expense	46,280	45,850	139,744	136,625
Income before income tax expense	38,544	32,187	105,254	92,033
Income tax expense	11,969	9,281	30,788	26,798
Net income	$ 26,575	$ 22,906	$ 74,466	$ 65,235
Basic earnings per share (usd per share)	$ 0.41	$ 0.36	$ 1.16	$ 1.03
Weighted average basic shares outstanding (in shares)	64,454,684	63,728,393	64,327,640	63,545,065
Diluted earnings per share (usd per share)	$ 0.41	$ 0.36	$ 1.15	$ 1.02
Weighted average diluted shares outstanding (in shares)	64,645,278	63,934,886	64,519,710	63,727,723

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 26,575	$ 22,906	$ 74,466	$ 65,235
Unrealized gains and losses on securities available for sale:
Net unrealized gains (losses) arising during the period	479	(1,541)	2,478	8,533
Reclassification adjustment for gains included in net income	0	26	0	(32)
Total	479	(1,515)	2,478	8,501
Unrealized gains (losses) on derivatives	54	230	106	(361)
Amortization related to post-retirement obligations	36	141	105	380
Total other comprehensive income (loss)	569	(1,144)	2,689	8,520
Total comprehensive income	$ 27,144	$ 21,762	$ 77,155	$ 73,755

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Unallocated ESOP Shares [Member]	Common Stock Acquired By Directors Deferred Fee Plan [Member]	Deferred Compensation DDFP [Member]
Beginning balance at Dec. 31, 2015	$ 1,196,065	$ 832	$ 1,000,810	$ 507,713	$ (2,546)	$ (269,014)	$ (41,730)	$ (6,517)	$ 6,517
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	65,235			65,235
Other comprehensive income, net of tax	8,520				8,520
Cash dividends declared	(35,141)			(35,141)
Effect of adopting Accounting Standards Update (ASU) No. 2016-09	0		(622)	622
Distributions from DDFP	91		91					503	(503)
Purchases of treasury stock	(1,557)					(1,557)
Purchase of employee restricted shares to fund statutory tax withholding	(1,161)					(1,161)
Shares issued dividend reinvestment plan	1,176		180			996
Stock option exercises	5,598		(60)			5,658
Allocation of ESOP shares	2,341		325				2,016
Allocation of SAP shares	2,982		2,982
Allocation of stock options	131		131
Ending Balance at Sep. 30, 2016	1,244,280	832	1,003,837	538,429	5,974	(265,078)	(39,714)	(6,014)	6,014
Beginning balance at Jun. 30, 2016					7,118
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	22,906
Other comprehensive income, net of tax	(1,144)				(1,144)
Ending Balance at Sep. 30, 2016	1,244,280	832	1,003,837	538,429	5,974	(265,078)	(39,714)	(6,014)	6,014
Beginning balance at Dec. 31, 2016	1,251,781	832	1,005,777	550,768	(3,397)	(264,221)	(37,978)	(5,846)	5,846
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	74,466			74,466
Other comprehensive income, net of tax	2,689				2,689
Cash dividends declared	(38,659)			(38,659)
Distributions from DDFP	172		172					503	(503)
Purchases of treasury stock	(443)					(443)
Purchase of employee restricted shares to fund statutory tax withholding	(726)					(726)
Shares issued dividend reinvestment plan	1,339		417			922
Stock option exercises	2,534		(1,024)			3,558
Allocation of ESOP shares	3,167		1,053				2,114
Allocation of SAP shares	3,702		3,702
Allocation of stock options	150		150
Ending Balance at Sep. 30, 2017	1,300,172	832	1,010,247	586,575	(708)	(260,910)	(35,864)	(5,343)	5,343
Beginning balance at Jun. 30, 2017					(1,277)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	26,575
Other comprehensive income, net of tax	569				569
Ending Balance at Sep. 30, 2017	$ 1,300,172	$ 832	$ 1,010,247	$ 586,575	$ (708)	$ (260,910)	$ (35,864)	$ (5,343)	$ 5,343

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net income	$ 74,466	$ 65,235
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of intangibles	8,864	9,711
Provision for loan losses	3,700	4,200
Deferred tax expense	640	323
Income on Bank-owned life insurance	(5,291)	(4,083)
Net amortization of premiums and discounts on securities	7,504	7,908
Accretion of net deferred loan fees	(3,673)	(2,500)
Amortization of premiums on purchased loans, net	800	936
Net increase in loans originated for sale	(18,386)	(32,734)
Proceeds from sales of loans originated for sale	19,149	34,709
Proceeds from sales and paydowns of foreclosed assets	4,883	3,717
ESOP expense	3,167	2,341
Allocation of stock award shares	3,702	2,982
Allocation of stock options	150	131
Net gain on sale of loans	(763)	(1,975)
Net gain on securities transactions	(47)	(54)
Net gain on sale of premises and equipment	(8)	(14)
Net gain on sale of foreclosed assets	(768)	(652)
(Increase) decrease in accrued interest receivable	(316)	461
Increase in other assets	(2,407)	(17,108)
(Decrease) increase in other liabilities	(4,846)	10,942
Net cash provided by operating activities	90,520	84,476
Cash flows from investing activities:
Proceeds from maturities, calls and paydowns of investment securities held to maturity	42,382	49,245
Purchases of investment securities held to maturity	(38,074)	(54,059)
Proceeds from sales of securities	0	3,401
Proceeds from maturities, calls and paydowns of securities available for sale	160,436	146,958
Purchases of securities available for sale	(149,647)	(209,666)
Proceeds from redemption of Federal Home Loan Bank stock	96,040	46,757
Purchases of Federal Home Loan Bank stock	(91,210)	(39,595)
Death benefit proceeds from bank-owned life insurance	4,428	0
Purchases of loans	0	(28,590)
Net increase in loans	(23,888)	(325,838)
Proceeds from sales of premises and equipment	8	14
Purchases of premises and equipment	(1,690)	(3,757)
Net cash used in investing activities	(1,215)	(415,130)
Cash flows from financing activities:
Net increase in deposits	37,587	603,511
Increase in mortgage escrow deposits	734	940
Cash dividends paid to stockholders	(38,659)	(35,141)
Shares issued through the dividend reinvestment plan	1,339	1,176
Purchases of treasury stock	(443)	(1,557)
Purchase of employee restricted shares to fund statutory tax withholding	(726)	(1,161)
Stock options exercised	2,534	5,598
Proceeds from long-term borrowings	248,220	291,653
Payments on long-term borrowings	(345,387)	(395,405)
Net increase (decrease) in short-term borrowings	9,982	(81,512)
Net cash (used in) provided by financing activities	(84,819)	388,102
Net increase in cash and cash equivalents	4,486	57,448
Cash and cash equivalents at beginning of period	144,297	102,226
Cash and cash equivalents at end of period	148,783	159,674
Cash paid during the period for:
Interest on deposits and borrowings	34,127	33,088
Income taxes	27,411	25,546
Non-cash investing activities:
Transfer of loans receivable to foreclosed assets	$ 2,195	$ 3,081

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies A. Basis of Financial Statement Presentation The accompanying unaudited consolidated financial statements include the accounts of Provident Financial Services, Inc. and its wholly owned subsidiary, Provident Bank (the “Bank,” together with Provident Financial Services, Inc., the “Company”). In preparing the interim unaudited 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 consolidated statements of financial condition and the consolidated statements of income for the periods presented. Actual results could differ from these estimates. The allowance for loan losses, the valuation of securities available for sale and the valuation of deferred tax assets are material estimates that are particularly susceptible to near-term change. The interim unaudited consolidated financial statements reflect all normal and recurring adjustments, which are, in the opinion of management, considered necessary for a fair presentation of the financial condition and results of operations for the periods presented. The results of operations for the three and nine months ended September 30, 2017 are not necessarily indicative of the results of operations that may be expected for all of 2017 . Certain information and note disclosures normally included in financial statements prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission. Certain reclassifications have been made in the consolidated financial statements to conform with current year classifications. These unaudited consolidated financial statements should be read in conjunction with the December 31, 2016 Annual Report to Stockholders on Form 10-K. B. Earnings Per Share The following is a reconciliation of the numerators and denominators of the basic and diluted earnings per share calculations for the three and nine months ended September 30, 2017 and 2016 (dollars in thousands, except per share amounts): Three months ended September 30, 2017 2016 Net Income Weighted Average Common Shares Outstanding Per Share Amount Net Income Weighted Average Common Shares Outstanding Per Share Amount Net income $ 26,575 $ 22,906 Basic earnings per share: Income available to common stockholders $ 26,575 64,454,684 $ 0.41 $ 22,906 63,728,393 $ 0.36 Dilutive shares 190,594 206,493 Diluted earnings per share: Income available to common stockholders $ 26,575 64,645,278 $ 0.41 $ 22,906 63,934,886 $ 0.36 Nine months ended September 30, 2017 2016 Net Income Weighted Average Common Shares Outstanding Per Share Amount Net Income Weighted Average Common Shares Outstanding Per Share Amount Net income $ 74,466 $ 65,235 Basic earnings per share: Income available to common stockholders $ 74,466 64,327,640 $ 1.16 $ 65,235 63,545,065 $ 1.03 Dilutive shares 192,070 182,658 Diluted earnings per share: Income available to common stockholders $ 74,466 64,519,710 $ 1.15 $ 65,235 63,727,723 $ 1.02 Anti-dilutive stock options and awards at September 30, 2017 and 2016 , totaling 405,958 shares and 528,205 shares, respectively, were excluded from the earnings per share calculations.

Investment Securities

Investment Securities	9 Months Ended
	Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities At September 30, 2017 , the Company had $ 1.03 billion and $481.8 million in available for sale and held to maturity investment securities, respectively. Many factors, including lack of liquidity in the secondary market for certain securities, variations in pricing information, regulatory actions, changes in the business environment or any changes in the competitive marketplace could have an adverse effect on the Company’s investment portfolio which could result in other-than-temporary impairment ("OTTI") in future periods. The total number of held to maturity and available for sale securities in an unrealized loss position as of September 30, 2017 totaled 253 , compared with 419 at December 31, 2016 . All securities with unrealized losses at September 30, 2017 were analyzed for other-than-temporary impairment. Based upon this analysis, the Company believes that as of September 30, 2017 , such securities with unrealized losses do not represent impairments that are other-than-temporary. Securities Available for Sale The following tables present the amortized cost, gross unrealized gains, gross unrealized losses and the fair value for securities available for sale at September 30, 2017 and December 31, 2016 (in thousands): September 30, 2017 Amortized Gross Gross Fair U.S. Treasury obligations $ 5,995 — (1 ) 5,994 Agency obligations 28,031 15 (11 ) 28,035 Mortgage-backed securities 965,863 7,477 (4,928 ) 968,412 State and municipal obligations 3,695 112 — 3,807 Corporate obligations 21,049 420 (10 ) 21,459 Equity securities 397 201 — 598 $ 1,025,030 8,225 (4,950 ) 1,028,305 December 31, 2016 Amortized Gross Gross Fair U.S. Treasury obligations $ 7,995 13 — 8,008 Agency obligations 57,123 90 (25 ) 57,188 Mortgage-backed securities 952,992 7,249 (8,380 ) 951,861 State and municipal obligations 3,727 19 (3 ) 3,743 Corporate obligations 19,013 35 (11 ) 19,037 Equity securities 397 152 — 549 $ 1,041,247 7,558 (8,419 ) 1,040,386 The amortized cost and fair value of securities available for sale at September 30, 2017 , by contractual maturity, are shown below (in thousands). Expected maturities may differ from contractual maturities due to prepayment or early call privileges of the issuer. September 30, 2017 Amortized cost Fair value Due in one year or less $ 35,452 35,445 Due after one year through five years 2,423 2,471 Due after five years through ten years 20,895 21,379 Due after ten years — — $ 58,770 59,295 Mortgage-backed securities totaling $965.9 million at amortized cost and $968.4 million at fair value are excluded from the table above as their expected lives are likely to be shorter than the contractual maturity date due to principal prepayments. Also excluded from the table above are equity securities of $397,000 at amortized cost and $598,000 at fair value. For the three and nine months ended September 30, 2017 , no securities were sold or called from the securities available for sale portfolio. For the three months ended September 30, 2016 , proceeds from sales on securities available for sale totaled $1.2 million resulting in no gross gains and $45,000 of gross losses. Proceeds from the sale of securities available for sale, for the nine months ended September 30, 2016 , totaled $3.4 million , resulting in gross gains of $95,000 and gross losses of $45,000 . There were no calls of available for sale securities for the three and nine months ended September 30, 2016 . The Company did not incur an OTTI charge on securities in the available for sale portfolio for the three and nine months ended September 30, 2017 and 2016 . The following tables present the fair value and gross unrealized losses for securities available for sale with temporary impairment at September 30, 2017 and December 31, 2016 (in thousands): September 30, 2017 Unrealized Losses Less than 12 months 12 months or longer Total Fair value Gross unrealized losses Fair value Gross unrealized losses Fair value Gross unrealized losses U.S. Treasury obligations $ 5,994 (1 ) — — 5,994 (1 ) Agency obligations 16,008 (11 ) — — 16,008 (11 ) Mortgage-backed securities 424,627 (3,956 ) 50,881 (972 ) 475,508 (4,928 ) Corporate obligations — — 991 (10 ) 991 (10 ) $ 446,629 (3,968 ) 51,872 (982 ) 498,501 (4,950 ) December 31, 2016 Unrealized Losses Less than 12 months 12 months or longer Total Fair value Gross unrealized losses Fair value Gross unrealized losses Fair value Gross unrealized losses Agency obligations $ 14,000 (25 ) — — 14,000 (25 ) Mortgage-backed securities 553,629 (8,377 ) 65 (3 ) 553,694 (8,380 ) State and municipal obligations 661 (3 ) — — 661 (3 ) Corporate obligations — — 990 (11 ) 990 (11 ) $ 568,290 (8,405 ) 1,055 (14 ) 569,345 (8,419 ) The temporary loss position associated with securities available for sale was the result of changes in market interest rates relative to the coupon of the individual security and changes in credit spreads. The Company does not have the intent to sell securities in a temporary loss position at September 30, 2017 , nor is it more likely than not that the Company will be required to sell the securities before their prices recover. The number of available for sale securities in an unrealized loss position at September 30, 2017 totaled 82 , compared with 87 at December 31, 2016 . At September 30, 2017 , there were two private label mortgage-backed securities in an unrealized loss position, with an amortized cost of $50,000 and an unrealized loss of $2,000 . Neither of these private label mortgage-backed securities were below investment grade at September 30, 2017 . The Company estimates the loss projections for each security by stressing the individual loans collateralizing the security and applying a range of expected default rates, loss severities, and prepayment speeds in conjunction with the underlying credit enhancement for each security. Based on specific assumptions about collateral and vintage, a range of possible cash flows was identified to determine whether OTTI existed during the nine months ended September 30, 2017 . The Company believes that no OTTI of the securities available for sale portfolio existed for the three and nine months ended September 30, 2017 . Investment Securities Held to Maturity The following tables present the amortized cost, gross unrealized gains, gross unrealized losses and the estimated fair value for investment securities held to maturity at September 30, 2017 and December 31, 2016 (in thousands): September 30, 2017 Amortized cost Gross unrealized gains Gross unrealized losses Fair value Agency obligations $ 4,307 — (55 ) 4,252 Mortgage-backed securities 475 17 — 492 State and municipal obligations 467,113 10,407 (1,761 ) 475,759 Corporate obligations 9,950 6 (34 ) 9,922 $ 481,845 10,430 (1,850 ) 490,425 December 31, 2016 Amortized cost Gross unrealized gains Gross unrealized losses Fair value Agency obligations $ 4,306 2 (83 ) 4,225 Mortgage-backed securities 893 31 — 924 State and municipal obligations 473,653 6,635 (5,436 ) 474,852 Corporate obligations 9,331 7 (52 ) 9,286 $ 488,183 6,675 (5,571 ) 489,287 The Company generally purchases securities for long-term investment purposes, and differences between amortized cost and fair values may fluctuate during the investment period. There were no sales of securities from the held to maturity portfolio for the three and nine months ended September 30, 2017 and 2016 . For the three and nine months ended September 30, 2017 , proceeds from calls on securities in the held to maturity portfolio totaled $8.1 million and $28.7 million , respectively, with gross gains totaling $39,000 and $50,000 , respectively and gross losses of $3,000 in both the three and nine month periods. For the three and nine months ended September 30, 2016 , proceeds from calls of securities in the held to maturity portfolio totaled $20.3 million and $35.2 million , respectively, with gross gains totaling $2,000 and $4,000 , respectively and no gross losses recognized in either period. The amortized cost and fair value of investment securities in the held to maturity portfolio at September 30, 2017 by contractual maturity are shown below (in thousands). Expected maturities may differ from contractual maturities due to prepayment or early call privileges of the issuer. September 30, 2017 Amortized cost Fair value Due in one year or less $ 14,723 14,755 Due after one year through five years 65,170 66,276 Due after five years through ten years 254,191 259,908 Due after ten years 147,286 148,994 $ 481,370 489,933 Mortgage-backed securities totaling $475,000 at amortized cost and $492,000 at fair value are excluded from the table above as their expected lives are likely to be shorter than the contractual maturity date due to principal prepayments. The following tables present the fair value and gross unrealized losses for investment securities held to maturity with temporary impairment at September 30, 2017 and December 31, 2016 (in thousands): September 30, 2017 Unrealized Losses Less than 12 months 12 months or longer Total Fair value Gross unrealized losses Fair value Gross unrealized losses Fair value Gross unrealized losses Agency obligations $ 3,853 (55 ) — — 3,853 (55 ) State and municipal obligations 62,881 (938 ) 22,251 (823 ) 85,132 (1,761 ) Corporate obligations 6,646 (34 ) — — 6,646 (34 ) $ 73,380 (1,027 ) 22,251 (823 ) 95,631 (1,850 ) December 31, 2016 Unrealized Losses Less than 12 months 12 months or longer Total Fair Gross Fair Gross Fair Gross Agency obligations $ 3,525 (83 ) — — 3,525 (83 ) State and municipal obligations 172,152 (5,132 ) 6,617 (304 ) 178,769 (5,436 ) Corporate obligations 4,697 (52 ) — — 4,697 (52 ) $ 180,374 (5,267 ) 6,617 (304 ) 186,991 (5,571 ) Based upon the review of the held to maturity securities portfolio, the Company believes that as of September 30, 2017 , securities with unrealized loss positions shown above do not represent impairments that are other-than-temporary. The review of the portfolio for OTTI considers the percentage and length of time the fair value of an investment is below book value, as well as general market conditions, changes in interest rates, credit risks, whether the Company has the intent to sell the securities and whether it is more likely than not that the Company would be required to sell the securities before their prices recover. The number of held to maturity securities in an unrealized loss position at September 30, 2017 totaled 171 , compared with 332 at December 31, 2016 . The decrease in the number of securities in an unrealized loss position at September 30, 2017 , was due to a slight decrease in market interest rates from December 31, 2016 and a tightening of spreads in the municipal bond sector. All temporarily impaired investment securities were investment grade at September 30, 2017 .

Loans Receivable and Allowance

Loans Receivable and Allowance for Loan Losses	9 Months Ended
	Sep. 30, 2017
Receivables [Abstract]
Loans Receivable and Allowance for Loan Losses	Loans Receivable and Allowance for Loan Losses Loans receivable at September 30, 2017 and December 31, 2016 are summarized as follows (in thousands): September 30, 2017 December 31, 2016 Mortgage loans: Residential $ 1,157,311 1,211,672 Commercial 2,022,576 1,978,569 Multi-family 1,334,984 1,402,054 Construction 324,692 264,814 Total mortgage loans 4,839,563 4,857,109 Commercial loans 1,708,842 1,630,444 Consumer loans 481,262 516,755 Total gross loans 7,029,667 7,004,308 Purchased credit-impaired ("PCI") loans 991 1,272 Premiums on purchased loans 4,229 4,968 Unearned discounts (36 ) (39 ) Net deferred fees (6,799 ) (7,023 ) Total loans $ 7,028,052 7,003,486 The following tables summarize the aging of loans receivable by portfolio segment and class of loans, excluding PCI loans (in thousands): September 30, 2017 30-59 Days 60-89 Days Non-accrual Recorded Total Past Due Current Total Loans Receivable Mortgage loans: Residential $ 5,973 3,525 8,820 — 18,318 1,138,993 1,157,311 Commercial 608 292 8,070 — 8,970 2,013,606 2,022,576 Multi-family — — — — — 1,334,984 1,334,984 Construction — — — — — 324,692 324,692 Total mortgage loans 6,581 3,817 16,890 — 27,288 4,812,275 4,839,563 Commercial loans 1,870 244 17,523 — 19,637 1,689,205 1,708,842 Consumer loans 2,307 1,080 2,035 — 5,422 475,840 481,262 Total gross loans $ 10,758 5,141 36,448 — 52,347 6,977,320 7,029,667 December 31, 2016 30-59 Days 60-89 Days Non-accrual Recorded Total Past Current Total Loans Receivable Mortgage loans: Residential $ 5,891 6,563 12,021 — 24,475 1,187,197 1,211,672 Commercial — 80 7,493 — 7,573 1,970,996 1,978,569 Multi-family — — 553 — 553 1,401,501 1,402,054 Construction — — 2,517 — 2,517 262,297 264,814 Total mortgage loans 5,891 6,643 22,584 — 35,118 4,821,991 4,857,109 Commercial loans 1,656 357 16,787 — 18,800 1,611,644 1,630,444 Consumer loans 2,561 1,199 3,030 — 6,790 509,965 516,755 Total gross loans $ 10,108 8,199 42,401 — 60,708 6,943,600 7,004,308 Included in loans receivable are loans for which the accrual of interest income has been discontinued due to deterioration in the financial condition of the borrowers. The principal amounts of these non-accrual loans were $36.4 million and $42.4 million at September 30, 2017 and December 31, 2016 , respectively. Included in non-accrual loans were $9.1 million and $7.3 million of loans which were less than 90 days past due at September 30, 2017 and December 31, 2016 , respectively. There were no loans 90 days or greater past due and still accruing interest at September 30, 2017 or December 31, 2016 . The Company defines an impaired loan as a non-homogeneous loan greater than $1.0 million for which it is probable, based on current information, all amounts due under the contractual terms of the loan agreement will not be collected. Impaired loans also include all loans modified as troubled debt restructurings (“TDRs”). A loan is deemed to be a TDR when a loan modification resulting in a concession is made in an effort to mitigate potential loss arising from a borrower’s financial difficulty. Smaller balance homogeneous loans, including residential mortgages and other consumer loans, are evaluated collectively for impairment and are excluded from the definition of impaired loans, unless modified as TDRs. The Company separately calculates the reserve for loan losses on impaired loans. The Company may recognize impairment of a loan based upon: (1) the present value of expected cash flows discounted at the effective interest rate; (2) if a loan is collateral dependent, the fair value of collateral; or (3) the fair value of the loan. Additionally, if impaired loans have risk characteristics in common, those loans may be aggregated and historical statistics may be used as a means of measuring those impaired loans. The Company uses third-party appraisals to determine the fair value of the underlying collateral in its analysis of collateral dependent impaired loans. A third-party appraisal is generally ordered as soon as a loan is designated as a collateral dependent impaired loan and is updated annually or more frequently, if required. A specific allocation of the allowance for loan losses is established for each collateral dependent impaired loan with a carrying balance greater than the collateral’s fair value, less estimated costs to sell. Charge-offs are generally taken for the amount of the specific allocation when operations associated with the respective property cease and it is determined that collection of amounts due will be derived primarily from the disposition of the collateral. At each quarter end, if a loan is designated as a collateral dependent impaired loan and the third-party appraisal has not yet been received, an evaluation of all available collateral is made using the best information available at the time, including rent rolls, borrower financial statements and tax returns, prior appraisals, management’s knowledge of the market and collateral, and internally prepared collateral valuations based upon market assumptions regarding vacancy and capitalization rates, each as and where applicable. Once the appraisal is received and reviewed, the specific reserves are adjusted to reflect the appraised value. The Company believes there have been no significant time lapses in the recognition of changes in collateral values as a result of this process. At September 30, 2017 , there were 145 impaired loans totaling $50.2 million . Included in this total were 126 TDRs related to 122 borrowers totaling $31.7 million that were performing in accordance with their restructured terms and which continued to accrue interest at September 30, 2017 . At December 31, 2016 , there were 141 impaired loans totaling $52.0 million . Included in this total were 114 TDRs to 110 borrowers totaling $29.9 million that were performing in accordance with their restructured terms and which continued to accrue interest at December 31, 2016 . The following table summarizes loans receivable by portfolio segment and impairment method, excluding PCI loans (in thousands): September 30, 2017 Mortgage loans Commercial loans Consumer loans Total Portfolio Segments Individually evaluated for impairment $ 28,578 19,393 2,210 50,181 Collectively evaluated for impairment 4,810,985 1,689,449 479,052 6,979,486 Total gross loans $ 4,839,563 1,708,842 481,262 7,029,667 December 31, 2016 Mortgage loans Commercial loans Consumer loans Total Portfolio Segments Individually evaluated for impairment $ 29,551 20,255 2,213 52,019 Collectively evaluated for impairment 4,827,558 1,610,189 514,542 6,952,289 Total gross loans $ 4,857,109 1,630,444 516,755 7,004,308 The allowance for loan losses is summarized by portfolio segment and impairment classification as follows (in thousands): September 30, 2017 Mortgage loans Commercial loans Consumer loans Total Individually evaluated for impairment $ 1,773 1,028 71 2,872 Collectively evaluated for impairment 24,724 30,423 2,257 57,404 Total gross loans $ 26,497 31,451 2,328 60,276 December 31, 2016 Mortgage loans Commercial loans Consumer loans Total Individually evaluated for impairment $ 1,986 268 80 2,334 Collectively evaluated for impairment 27,640 28,875 3,034 59,549 Total gross loans $ 29,626 29,143 3,114 61,883 Loan modifications to borrowers experiencing financial difficulties that are considered TDRs primarily involve lowering the monthly payments on such loans through either a reduction in interest rate below a market rate, an extension of the term of the loan without a corresponding adjustment to the risk premium reflected in the interest rate, or a combination of these two methods. These modifications generally do not result in the forgiveness of principal or accrued interest. In addition, the Company attempts to obtain additional collateral or guarantor support when modifying such loans. If the borrower has demonstrated performance under the previous terms and our underwriting process shows the borrower has the capacity to continue to perform under the restructured terms, the loan will continue to accrue interest. Non-accruing restructured loans may be returned to accrual status when there has been a sustained period of repayment performance (generally six consecutive months of payments) and both principal and interest are deemed collectible. The following tables present the number of loans modified as TDRs during the three and nine months ended September 30, 2017 and 2016 , along with their balances immediately prior to the modification date and post-modification as of September 30, 2017 and 2016 . There were no loans modified as TDRs during the three and nine months ended September 30, 2016 . For the three months ended September 30, 2017 September 30, 2016 Troubled Debt Restructurings Number of Loans Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Number of Loans Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment ($ in thousands) Mortgage loans: Residential 2 $ 632 $ 470 — $ — $ — Total mortgage loans 2 632 470 — — — Total restructured loans 2 $ 632 $ 470 — $ — $ — For the nine months ended September 30, 2017 September 30, 2016 Troubled Debt Restructurings Number of Pre-Modification Post-Modification Number of Pre-Modification Post-Modification ($ in thousands) Mortgage loans: Residential 7 $ 3,436 $ 3,202 — $ — $ — Total mortgage loans 7 3,436 3,202 — — — Commercial loans 1 1,300 1,210 — — — Consumer loans 1 70 68 — — — Total restructured loans 9 $ 4,806 $ 4,480 — $ — $ — All TDRs are impaired loans, which are individually evaluated for impairment, as previously discussed. During the three and nine months ended September 30, 2017 , $3.2 million and $4.4 million of charge-offs were recorded on collateral dependent impaired loans. There were no charge-offs recorded on collateral dependent impaired loans for the same periods last year. For the three and nine months ended September 30, 2017 , the allowance for loan losses associated with the TDRs presented in the preceding tables totaled $0 and $120,000 , respectively, and were included in the allowance for loan losses for loans individually evaluated for impairment. For the three and nine months ended September 30, 2017 , the TDRs presented in the preceding tables had a weighted average modified interest rate of approximately 4.36% and 4.02% , respectively, compared to a weighted average rate of 4.33% and 3.93% prior to modification, respectively. There were no payment defaults (90 days or more past due) for loans modified as TDRs within the 12 month periods ending September 30, 2017 and 2016 . TDRs that subsequently default are considered collateral dependent impaired loans and are evaluated for impairment based on the estimated fair value of the underlying collateral less expected selling costs. PCI loans are loans acquired at a discount primarily due to deteriorated credit quality. As part of the May 30, 2014 acquisition of Team Capital, $5.2 million of the loans acquired were determined to be PCI loans. At the date of acquisition, PCI loans were accounted for at fair value, based upon the then present value of expected future cash flows, with no related allowance for loan losses. PCI loans totaled $1.0 million at September 30, 2017 and $1.3 million at December 31, 2016 . The following table summarizes the changes in the accretable yield for PCI loans during the three and nine months ended September 30, 2017 and 2016 (in thousands): Three months ended September 30, Nine months ended September 30, 2017 2016 2017 2016 Beginning balance $ 158 328 200 676 Accretion (154 ) (225 ) (299 ) (1,065 ) Reclassification from non-accretable discount 99 209 202 701 Ending balance $ 103 312 103 312 The activity in the allowance for loan losses by portfolio segment for the three and nine months ended September 30, 2017 and 2016 was as follows (in thousands): Three months ended September 30, Mortgage loans Commercial loans Consumer loans Total Portfolio Segments Unallocated Total 2017 Balance at beginning of period $ 28,826 31,085 2,951 62,862 — 62,862 Provision charged (credited) to operations (2,301 ) 3,446 (645 ) 500 — 500 Recoveries of loans previously charged-off 4 140 291 435 — 435 Loans charged-off (32 ) (3,220 ) (269 ) (3,521 ) — (3,521 ) Balance at end of period $ 26,497 31,451 2,328 60,276 — 60,276 2016 Balance at beginning of period $ 31,634 26,299 3,000 60,933 — 60,933 Provision charged (credited) to operations (1,599 ) 2,378 221 1,000 — 1,000 Recoveries of loans previously charged-off 2 68 160 230 — 230 Loans charged-off (383 ) (506 ) (186 ) (1,075 ) — (1,075 ) Balance at end of period $ 29,654 28,239 3,195 61,088 — 61,088 Nine months ended September 30, Mortgage Commercial Consumer Total Portfolio Unallocated Total 2017 Balance at beginning of period $ 29,626 29,143 3,114 61,883 — 61,883 Provision charged (credited) to operations (2,724 ) 6,840 (416 ) 3,700 — 3,700 Recoveries of loans previously charged-off 65 671 692 1,428 — 1,428 Loans charged-off (470 ) (5,203 ) (1,062 ) (6,735 ) — (6,735 ) Balance at end of period $ 26,497 31,451 2,328 60,276 — 60,276 2016 Balance at beginning of period $ 32,094 25,829 3,501 61,424 — 61,424 Provision charged (credited) to operations (2,294 ) 6,647 (153 ) 4,200 — 4,200 Recoveries of loans previously charged-off 575 351 697 1,623 — 1,623 Loans charged-off (721 ) (4,588 ) (850 ) (6,159 ) — (6,159 ) Balance at end of period $ 29,654 28,239 3,195 61,088 — 61,088 The following table presents loans individually evaluated for impairment by class and loan category, excluding PCI loans (in thousands): September 30, 2017 December 31, 2016 Unpaid Principal Balance Recorded Investment Related Allowance Average Recorded Investment Interest Income Recognized Unpaid Principal Balance Recorded Investment Related Allowance Average Recorded Investment Interest Income Recognized Loans with no related allowance Mortgage loans: Residential $ 13,035 10,277 — 10,391 340 10,691 7,881 — 8,027 484 Commercial 4,600 4,472 — 4,496 — 1,556 1,556 — 1,586 40 Construction — — — — — 2,553 2,517 — 2,514 — Total 17,635 14,749 — 14,887 340 14,800 11,954 — 12,127 524 Commercial loans 17,505 13,884 — 13,954 280 21,830 18,874 — 13,818 259 Consumer loans 1,606 1,067 — 1,186 51 1,493 981 — 1,026 59 Total impaired loans $ 36,746 29,700 — 30,027 671 38,123 31,809 — 26,971 842 Loans with an allowance recorded Mortgage loans: Residential $ 13,803 12,759 1,633 12,873 374 14,169 13,520 1,716 13,705 519 Commercial 1,071 1,070 140 1,083 40 4,138 4,077 270 4,111 55 Construction — — — — — — — — — — Total 14,874 13,829 1,773 13,956 414 18,307 17,597 1,986 17,816 574 Commercial loans 6,158 5,509 1,028 6,045 52 1,381 1,381 268 5,956 4 Consumer loans 1,154 1,143 71 1,170 47 1,242 1,232 80 1,259 66 Total impaired loans $ 22,186 20,481 2,872 21,171 513 20,930 20,210 2,334 25,031 644 Total impaired loans Mortgage loans: Residential $ 26,838 23,036 1,633 23,264 714 24,860 21,401 1,716 21,732 1,003 Commercial 5,671 5,542 140 5,579 40 5,694 5,633 270 5,697 95 Construction — — — — — 2,553 2,517 — 2,514 — Total 32,509 28,578 1,773 28,843 754 33,107 29,551 1,986 29,943 1,098 Commercial loans 23,663 19,393 1,028 19,999 332 23,211 20,255 268 19,774 263 Consumer loans 2,760 2,210 71 2,356 98 2,735 2,213 80 2,285 125 Total impaired loans $ 58,932 50,181 2,872 51,198 1,184 59,053 52,019 2,334 52,002 1,486 Specific allocations of the allowance for loan losses attributable to impaired loans totaled $2.9 million at September 30, 2017 and $2.3 million at December 31, 2016 . At September 30, 2017 and December 31, 2016 , impaired loans for which there was no related allowance for loan losses totaled $29.7 million and $31.8 million , respectively. The average balance of impaired loans for the nine months ended September 30, 2017 was $51.2 million . The Company utilizes an internal nine-point risk rating system to summarize its loan portfolio into categories with similar risk characteristics. Loans deemed to be “acceptable quality” are rated 1 through 4, with a rating of 1 established for loans with minimal risk. Loans that are deemed to be of “questionable quality” are rated 5 (watch) or 6 (special mention). Loans with adverse classifications (substandard, doubtful or loss) are rated 7, 8 or 9, respectively. Commercial mortgage, commercial, multi-family and construction loans are rated individually, and each lending officer is responsible for risk rating loans in their portfolio. These risk ratings are then reviewed by the department manager and/or the Chief Lending Officer and by the Credit Department. The risk ratings are also confirmed through periodic loan review examinations, which are currently performed by an independent third-party. Reports by the independent third-party are presented directly to the Audit Committee of the Board of Directors. Loans receivable by credit quality risk rating indicator, excluding PCI loans, are as follows (in thousands): At September 30, 2017 Residential Commercial mortgage Multi- family Construction Total mortgages Commercial Consumer Total loans Special mention $ 3,525 19,437 16 — 22,978 26,156 1,080 50,214 Substandard 8,820 25,633 — — 34,453 30,361 2,034 66,848 Doubtful — — — — — 771 — 771 Loss — — — — — — — — Total classified and criticized 12,345 45,070 16 — 57,431 57,288 3,114 117,833 Pass/Watch 1,144,966 1,977,506 1,334,968 324,692 4,782,132 1,651,554 478,148 6,911,834 Total $ 1,157,311 2,022,576 1,334,984 324,692 4,839,563 1,708,842 481,262 7,029,667 At December 31, 2016 Residential Commercial mortgage Multi- family Construction Total mortgages Commercial Consumer Total loans Special mention $ 6,563 25,329 563 — 32,455 14,840 1,242 48,537 Substandard 12,021 23,011 553 2,517 38,102 47,255 2,940 88,297 Doubtful — — — — — — — — Loss — — — — — — — — Total classified and criticized 18,584 48,340 1,116 2,517 70,557 62,095 4,182 136,834 Pass/Watch 1,193,088 1,930,229 1,400,938 262,297 4,786,552 1,568,349 512,573 6,867,474 Total $ 1,211,672 1,978,569 1,402,054 264,814 4,857,109 1,630,444 516,755 7,004,308

Deposits

Deposits	9 Months Ended
	Sep. 30, 2017
Banking and Thrift [Abstract]
Deposits	Deposits Deposits at September 30, 2017 and December 31, 2016 are summarized as follows (in thousands): September 30, 2017 December 31, 2016 Savings $ 1,083,215 1,099,020 Money market 1,539,064 1,582,750 NOW 1,972,220 1,871,298 Non-interest bearing 1,368,849 1,349,378 Certificates of deposit 627,868 651,183 Total deposits $ 6,591,216 6,553,629

Components of Net Periodic Bene

Components of Net Periodic Benefit Cost	9 Months Ended
	Sep. 30, 2017
Retirement Benefits [Abstract]
Components of Net Periodic Benefit Cost	Components of Net Periodic Benefit Cost The Bank has a noncontributory defined benefit pension plan covering its full-time employees who had attained age 21 with at least one year of service as of April 1, 2003. The pension plan was frozen on April 1, 2003. All participants in the Plan are 100% vested. The pension plan’s assets are invested in investment funds and group annuity contracts currently managed by the Principal Financial Group and Allmerica Financial. In addition to pension benefits, certain health care and life insurance benefits are currently made available to certain of the Bank’s retired employees. The costs of such benefits are accrued based on actuarial assumptions from the date of hire to the date the employee is fully eligible to receive the benefits. Effective January 1, 2003, eligibility for retiree health care benefits was frozen as to new entrants and benefits were eliminated for employees with less than ten years of service as of December 31, 2002. Effective January 1, 2007, eligibility for retiree life insurance benefits was frozen as to new entrants and retiree life insurance benefits were eliminated for employees with less than ten years of service as of December 31, 2006. Net periodic (increase) benefit cost for pension benefits and other post-retirement benefits for the three and nine months ended September 30, 2017 and 2016 includes the following components (in thousands): Three months ended September 30, Nine months ended September 30, Pension benefits Other post- retirement benefits Pension benefits Other post- retirement benefits 2017 2016 2017 2016 2017 2016 2017 2016 Service cost $ — — 26 37 $ — — 78 112 Interest cost 306 312 218 285 920 936 654 854 Expected return on plan assets (637 ) (612 ) — — (1,913 ) (1,836 ) — — Amortization of prior service cost — — — — — — — — Amortization of the net loss 230 236 (169 ) — 690 708 (507 ) — Net periodic (increase) benefit cost $ (101 ) (64 ) 75 322 $ (303 ) (192 ) 225 966 In its consolidated financial statements for the year ended December 31, 2016 , the Company previously disclosed that it does not expect to contribute to the pension plan in 2017 . As of September 30, 2017 , no contributions have been made to the pension plan. The net periodic (increase) benefit cost for pension benefits and other post-retirement benefits for the three and nine months ended September 30, 2017 were calculated using the actual January 1, 2017 pension and other post-retirement benefits valuations.

Impact of Recent Accounting Pro

Impact of Recent Accounting Pronouncements	9 Months Ended
	Sep. 30, 2017
Accounting Changes and Error Corrections [Abstract]
Impact of Recent Accounting Pronouncements	Impact of Recent Accounting Pronouncements In August 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update ("ASU") 2017-12, Derivatives and Hedging: Targeted Improvements to Accounting for Hedging Activities (ASU 2017-12). The purpose of this updated guidance is to better align a company’s financial reporting for hedging activities with the economic objectives of those activities. ASU 2017-12 is effective for public business entities for fiscal years beginning after December 15, 2018, with early adoption, including adoption in an interim period, permitted. ASU 2017-12 requires a modified retrospective transition method in which the Company will recognize the cumulative effect of the change on the opening balance of each affected component of equity in the statement of financial position as of the date of adoption. The Company is currently assessing the impact that the guidance will have on the Company’s consolidated financial statements. In May 2017, the FASB issued ASU 2017-09, “Compensation-Stock Compensation (Topic 718): Scope of Modification Accounting”. This update provides guidance about changes to terms or conditions of a share-based payment award which would require modification accounting. In particular, an entity is required to account for the effects of a modification if the fair value, vesting condition or the equity/liability classification of the modified award is not the same immediately before and after a change to the terms and conditions of the award. ASU 2017-09 is effective on a prospective basis for fiscal years beginning after December 15, 2017, with early adoption permitted. The Company does not expect ASU 2017-09 to have a significant impact on the Company's consolidated financial statements. In March 2017, the FASB issued ASU 2017-08, “Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities.” This ASU shortens the amortization period for premiums on callable debt securities by requiring that premiums be amortized to the first (or earliest) call date instead of as an adjustment to the yield over the contractual life. This change more closely aligns the accounting with the economics of a callable debt security and the amortization period with expectations that already are included in market pricing on callable debt securities. This ASU does not change the accounting for discounts on callable debt securities, which will continue to be amortized to the maturity date. This guidance includes only instruments that are held at a premium and have explicit call features. It does not include instruments that contain prepayment features, such as mortgage backed securities; nor does it include call options that are contingent upon future events or in which the timing or amount to be paid is not fixed. The effective date for this ASU is fiscal years beginning after December 15, 2018, including interim periods within the reporting period, with early adoption permitted. Transition is on a modified retrospective basis with an adjustment to retained earnings as of the beginning of the period of adoption. If early adopted in an interim period, adjustments should be reflected as of the beginning of the fiscal year that includes that interim period. The Company is currently assessing the impact that the guidance will have on the Company’s consolidated financial statements. In March 2017, the FASB issued ASU 2017-07, "Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Post-retirement Benefit Cost", which requires that companies disaggregate the service cost component from other components of net benefit cost. This update calls for companies that offer post-retirement benefits to present the service cost, which is the amount an employer has to set aside each quarter or fiscal year to cover the benefits, in the same line item with other current employee compensation costs. Other components of net benefit cost will be presented in the income statement separately from the service cost component and outside the subtotal of income from operations, if one is presented. ASU 2017-07 is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The Company does not expect ASU 2017-07 to have a significant impact on the Company's consolidated financial statements. In January 2017, the FASB issued ASU 2017-04, “Simplifying the Test for Goodwill Impairment.” The main objective of this ASU is to simplify the accounting for goodwill impairment by requiring that impairment charges be based upon the first step in the current two-step impairment test under Accounting Standards Codification (ASC) 350. Currently, if the fair value of a reporting unit is lower than its carrying amount (Step 1), an entity calculates any impairment charge by comparing the implied fair value of goodwill with its carrying amount (Step 2). The implied fair value of goodwill is calculated by deducting the fair value of all assets and liabilities of the reporting unit from the reporting unit’s fair value as determined in Step 1. To determine the implied fair value of goodwill, entities estimate the fair value of any unrecognized intangible assets and any corporate-level assets or liabilities that were included in the determination of the carrying amount and fair value of the reporting unit in Step 1. Under ASU 2017-04, if a reporting unit’s carrying amount exceeds its fair value, an entity will record an impairment charge based on that difference. The impairment charge will be limited to the amount of goodwill allocated to that reporting unit. This standard eliminates the requirement to calculate a goodwill impairment charge using Step 2. ASU 2017-04 does not change the guidance on completing Step 1 of the goodwill impairment test. Under ASU 2017-04, an entity will still be able to perform the current optional qualitative goodwill impairment assessment before determining whether to proceed to Step 1. The standard will be applied prospectively and is effective for annual and interim impairment tests performed in periods beginning after December 15, 2019. Early adoption is permitted for annual and interim goodwill impairment testing dates after January 1, 2017. The Company does not expect ASU 2017-04 to have a significant impact on the Company's consolidated financial statements. In August 2016, the FASB issued ASU 2016-15, "Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments," a new standard which addresses diversity in practice related to eight specific cash flow issues: debt prepayment or extinguishment costs, settlement of zero-coupon debt instruments or other debt instruments with coupon interest rates that are insignificant in relation to the effective interest rate of the borrowing, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, proceeds from the settlement of corporate-owned life insurance policies (including bank-owned life insurance policies), distributions received from equity method investees, beneficial interests in securitization transactions and separately identifiable cash flows and application of the predominance principle. ASU 2016-15 is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Entities will apply the standard’s provisions using a retrospective transition method to each period presented. If it is impracticable to apply the amendments retrospectively for some of the issues, the amendments for those issues would be applied prospectively as of the earliest date practicable. The Company is currently assessing the impact that the guidance will have on the Company’s consolidated financial statements. In June 2016, the FASB issued ASU 2016-13, “Measurement of Credit Losses on Financial Instruments.” The main objective of this ASU is to provide financial statement users with more decision-useful information about the expected credit losses on financial instruments by a reporting entity at each reporting date. The amendments in this ASU require financial assets measured at amortized cost to be presented at the net amount expected to be collected. The allowance for credit losses would represent a valuation account that would be deducted from the amortized cost basis of the financial asset(s) to present the net carrying value at the amount expected to be collected on the financial asset. The income statement would reflect the measurement of credit losses for newly recognized financial assets, as well as the expected increases or decreases of expected credit losses that have taken place during the period. The measurement of expected credit losses would be based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. An entity will be required to use judgment in determining the relevant information and estimation methods that are appropriate in its circumstances. The amendments in ASU 2016-13 are effective for fiscal years, including interim periods, beginning after December 15, 2019. Early adoption of this ASU is permitted for fiscal years beginning after December 15, 2018. The Company is currently evaluating the potential impact of ASU 2016-13 on the consolidated financial statements. In that regard, the Company has formed a cross-functional working group, under the direction of the Chief Credit Officer, Chief Financial Officer and Chief Risk Officer. The working group is comprised of individuals from various functional areas including credit, risk management, finance and information technology, among others. The Company is currently developing an implementation plan to include assessment of processes, portfolio segmentation, model development, system requirements and the identification of data and resource needs, among other things. Also, the Company is currently evaluating third-party vendor solutions to assist us in the application of the ASU 2016-13. The adoption of the ASU 2016-13 may result in an increase in the allowance for loan losses as a result of changing from an "incurred loss" model, which encompasses allowances for current known and inherent losses within the portfolio, to an "expected loss" model, which encompasses allowances for losses expected to be incurred over the life of the portfolio. Furthermore, ASU 2016-13 will necessitate establishing an allowance for expected credit losses on debt securities. The Company is currently unable to reasonably estimate the impact of adopting ASU 2016-13, it is expected that the impact of adoption will be significantly influenced by the composition, characteristics and quality of our loan and securities portfolios as well as the prevailing economic conditions and forecasts as of the adoption date. In February 2016, the FASB issued ASU 2016-02, "Leases (Topic 842).” This ASU requires all lessees to recognize a lease liability and a right-of-use asset, measured at the present value of the future minimum lease payments, at the lease commencement date. Lessor accounting remains largely unchanged under the new guidance. The guidance is effective for fiscal years beginning after December 15, 2018, including interim reporting periods within that reporting period, with early adoption permitted. A modified retrospective approach must be applied for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements. The Company is currently assessing the impact that the guidance will have on the Company's consolidated financial statements. In January 2016, the FASB issued ASU 2016-01, "Financial Instruments - Overall: Recognition and Measurement of Financial Assets and Liabilities." This ASU addresses certain aspects of recognition, measurement, presentation, and disclosure of financial instruments. This amendment supersedes the guidance to classify equity securities with readily determinable fair values into different categories, requires equity securities, except equity method investments, to be measured at fair value with changes in the fair value recognized through net income, and simplifies the impairment assessment of equity investments without readily determinable fair values. The amendment requires public business entities that are required to disclose the fair value of financial instruments measured at amortized cost on the balance sheet to measure that fair value using the exit price notion. The amendment requires an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option. The amendment requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or in the accompanying notes to the financial statements. The amendment reduces diversity in current practice by clarifying that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available for sale securities in combination with the entity’s other deferred tax assets. This amendment is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Entities should apply the amendment by means of a cumulative-effect adjustment as of the beginning of the fiscal year of adoption, with the exception of the amendment related to equity securities without readily determinable fair values, which should be applied prospectively to equity investments that exist as of the date of adoption. The Company is currently evaluating the impact that the guidance will have on the Company's consolidated financial statements. In May 2014, the FASB issued ASU 2014-09, "Revenue from Contracts with Customers (Topic 606)." The objective of this amendment is to clarify the principles for recognizing revenue and to develop a common revenue standard for U.S. GAAP and IFRS. This update affects any entity that either enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of nonfinancial assets unless those contracts are in the scope of other standards. The ASU is effective for public business entities for financial statements issued for fiscal years beginning after December 15, 2017, and early adoption is permitted. Subsequently, the FASB issued the following standards related to ASU 2014-09: ASU 2016-08, “Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations;” ASU 2016-10, “Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing;” ASU 2016-11, “Revenue Recognition (Topic 605) and Derivatives and Hedging (Topic 815): Rescission of SEC Guidance Because of Accounting Standards Updates 2014-09 and 2014-16 Pursuant to Staff Announcements at the March 3, 2016 EITF Meeting;” and ASU 2016-12, “Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients.” These amendments are intended to improve and clarify the implementation guidance of ASU 2014-09 and have the same effective date as the original standard. The Company's revenue is comprised of net interest income on interest earning assets and liabilities and non-interest income. The scope of guidance explicitly excludes net interest income as well as other revenues associated with financial assets and liabilities, including loans, leases, securities and derivatives. Accordingly, the majority of the Company's revenues will not be affected. The Company has formed a working group to guide implementation efforts including the identification of revenue within the scope of the guidance, as well as the evaluation of revenue contracts and the respective performance obligations within those contracts. While the Company has not identified any material changes related to the timing or amount of revenue recognition, the Company will continue to evaluate disaggregation for significant categories of revenue in the scope of the guidance and the need for additional disclosures. The Company will adopt the standard in the first quarter of 2018 with a cumulative effect adjustment to opening retained earnings, if such adjustment is deemed to be significant.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The Company utilizes fair value measurements to record fair value adjustments to certain assets and liabilities and to determine fair value disclosures. The determination of fair values of financial instruments often requires the use of estimates. Where quoted market values in an active market are not readily available, the Company utilizes various valuation techniques to estimate fair value. Fair value is an estimate of the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. However, in many instances fair value estimates may not be substantiated by comparison to independent markets and may not be realized in an immediate sale of the financial instrument. GAAP establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of fair value hierarchy are as follows: Level 1: Unadjusted quoted market prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities; Level 2: Quoted prices in markets that are not active, or inputs that are observable either directly or indirectly, for substantially the full term of the asset or liability; and Level 3: Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable (i.e., supported by little or no market activity). A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. The valuation techniques are based upon the unpaid principal balance only, and exclude any accrued interest or dividends at the measurement date. Interest income and expense and dividend income are recorded within the consolidated statements of income depending on the nature of the instrument using the effective interest method based on acquired discount or premium. Assets and Liabilities Measured at Fair Value on a Recurring Basis The valuation techniques described below were used to measure fair value of financial instruments in the table below on a recurring basis as of September 30, 2017 and December 31, 2016 . Securities Available for Sale For securities available for sale, fair value was estimated using a market approach. The majority of the Company’s securities are fixed income instruments that are not quoted on an exchange, but are traded in active markets. Prices for these instruments are obtained through third-party data service providers or dealer market participants with which the Company has historically transacted both purchases and sales of securities. Prices obtained from these sources include market quotations and matrix pricing. Matrix pricing, a Level 2 input, is a mathematical technique used principally to value certain securities to benchmark or to comparable securities. The Company evaluates the quality of Level 2 matrix pricing through comparison to similar assets with greater liquidity and evaluation of projected cash flows. As the Company is responsible for the determination of fair value, it performs quarterly analyses on the prices received from the pricing service to determine whether the prices are reasonable estimates of fair value. Specifically, the Company compares the prices received from the pricing service to a secondary pricing source. Additionally, the Company compares changes in the reported market values and returns to relevant market indices to test the reasonableness of the reported prices. The Company’s internal price verification procedures and review of fair value methodology documentation provided by independent pricing services has not historically resulted in an adjustment in the prices obtained from the pricing service. The Company also may hold equity securities and debt instruments issued by the U.S. government and U.S. government-sponsored agencies that are traded in active markets with readily accessible quoted market prices that are considered Level 1 inputs. Derivatives The Company records all derivatives on the statement of financial condition at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether the Company has elected to designate a derivative in a hedging relationship and apply hedge accounting and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. The Company has interest rate derivatives resulting from a service provided to certain qualified borrowers in a loan related transaction and, therefore, are not used to manage interest rate risk in the Company’s assets or liabilities. As such, all changes in fair value of the Company’s derivatives are recognized directly in earnings. The Company also uses interest rate swaps as part of its interest rate risk management strategy. Interest rate swaps designated as cash flow hedges, and which satisfy hedge accounting requirements, involve the receipt of variable amounts from a counterparty in exchange for the Company making fixed-rate payments over the life of the agreements without the exchange of the underlying notional amount. These derivatives were used to hedge the variable cash outflows associated with FHLBNY borrowings. The effective portion of changes in the fair value of these derivatives are recorded in accumulated other comprehensive income, and are subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings. The ineffective portion of the change in fair value of these derivatives are recognized directly in earnings. The fair value of the Company's derivatives are determined using discounted cash flow analysis using observable market-based inputs, which are considered Level 2 inputs. Assets Measured at Fair Value on a Non-Recurring Basis The valuation techniques described below were used to estimate fair value of financial instruments measured on a non-recurring basis as of September 30, 2017 and December 31, 2016 . Collateral Dependent Impaired Loans For loans measured for impairment based on the fair value of the underlying collateral, fair value was estimated using a market approach. The Company measures the fair value of collateral underlying impaired loans primarily through obtaining independent appraisals that rely upon quoted market prices for similar assets in active markets. These appraisals include adjustments, on an individual case-by-case basis, to comparable assets based on the appraisers’ market knowledge and experience, as well as adjustments for estimated costs to sell between 5% and 10% . The Company classifies these loans as Level 3 within the fair value hierarchy. Foreclosed Assets Assets acquired through foreclosure or deed in lieu of foreclosure are carried at fair value, less estimated selling costs, which range between 5% and 10% . Fair value is generally based on independent appraisals that rely upon quoted market prices for similar assets in active markets. These appraisals include adjustments, on an individual case basis, to comparable assets based on the appraisers’ market knowledge and experience, and are classified as Level 3. 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. A reserve for foreclosed assets may be established to provide for possible write-downs and selling costs that occur subsequent to foreclosure. Foreclosed assets are carried net of the related reserve. Operating results from real estate owned, including rental income, operating expenses, and gains and losses realized from the sales of real estate owned, are recorded as incurred. There were no changes to the valuation techniques for fair value measurements as of September 30, 2017 and December 31, 2016 . The following tables present the assets and liabilities reported on the consolidated statements of financial condition at their fair values as of September 30, 2017 and December 31, 2016 , by level within the fair value hierarchy: Fair Value Measurements at Reporting Date Using: (In thousands) September 30, 2017 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Measured on a recurring basis: Securities available for sale: U.S. Treasury obligations $ 5,994 5,994 — — Agency obligations 28,035 28,035 — — Mortgage-backed securities 968,412 — 968,412 — State and municipal obligations 3,807 — 3,807 — Corporate obligations 21,459 — 21,459 — Equity securities 598 598 — — Total securities available for sale 1,028,305 34,627 993,678 — Derivative assets 8,035 — 8,035 — $ 1,036,340 34,627 1,001,713 — Derivative liabilities $ 7,595 — 7,595 — Measured on a non-recurring basis: Loans measured for impairment based on the fair value of the underlying collateral $ 5,525 — — 5,525 Foreclosed assets 5,703 — — 5,703 $ 11,228 — — 11,228 Fair Value Measurements at Reporting Date Using: (In thousands) December 31, 2016 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Measured on a recurring basis: Securities available for sale: U.S. Treasury obligations $ 8,008 8,008 — — Agency obligations 57,188 57,188 — — Mortgage-backed securities 951,861 — 951,861 — State and municipal obligations 3,743 — 3,743 — Corporate obligations 19,037 — 19,037 — Equity securities 549 549 — — Total securities available for sale $ 1,040,386 65,745 974,641 — Derivative assets 7,441 — 7,441 — $ 1,047,827 65,745 982,082 — Derivative liabilities $ 6,750 — 6,750 — Measured on a non-recurring basis: Loans measured for impairment based on the fair value of the underlying collateral $ 11,001 — — 11,001 Foreclosed assets 7,991 — — 7,991 $ 18,992 — — 18,992 There were no transfers between Level 1, Level 2 and Level 3 during the three and nine months ended September 30, 2017 . Other Fair Value Disclosures The Company is required to disclose estimated fair value of financial instruments, both assets and liabilities on and off the balance sheet, for which it is practicable to estimate fair value. The following is a description of valuation methodologies used for those assets and liabilities. Cash and Cash Equivalents For cash and due from banks, federal funds sold and short-term investments, the carrying amount approximates fair value. Investment Securities Held to Maturity For investment securities held to maturity, fair value was estimated using a market approach. The majority of the Company’s securities are fixed income instruments that are not quoted on an exchange, but are traded in active markets. Prices for these instruments are obtained through third party data service providers or dealer market participants with which the Company has historically transacted both purchases and sales of securities. Prices obtained from these sources include market quotations and matrix pricing. Matrix pricing, a Level 2 input, is a mathematical technique used principally to value certain securities to benchmark or comparable securities. The Company evaluates the quality of Level 2 matrix pricing through comparison to similar assets with greater liquidity and evaluation of projected cash flows. As the Company is responsible for the determination of fair value, it performs quarterly analyses on the prices received from the pricing service to determine whether the prices are reasonable estimates of fair value. Specifically, the Company compares the prices received from the pricing service to a secondary pricing source. Additionally, the Company compares changes in the reported market values and returns to relevant market indices to test the reasonableness of the reported prices. The Company’s internal price verification procedures and review of fair value methodology documentation provided by independent pricing services has not historically resulted in adjustment in the prices obtained from the pricing service. The Company also holds debt instruments issued by the U.S. government and U.S. government agencies that are traded in active markets with readily accessible quoted market prices that are considered Level 1 within the fair value hierarchy. Federal Home Loan Bank of New York ("FHLBNY") Stock The carrying value of FHLBNY stock was its cost. The fair value of FHLBNY stock is based on redemption at par value. The Company classifies the estimated fair value as Level 1 within the fair value hierarchy. Loans Fair values are estimated for portfolios of loans with similar financial characteristics. Loans are segregated by type such as commercial mortgage, residential mortgage, commercial, construction and consumer. Each loan category is further segmented into fixed and adjustable rate interest terms and into performing and non-performing categories. The fair value of performing loans was estimated using a combination of techniques, including a discounted cash flow model that utilizes a discount rate that reflects the Company’s current pricing for loans with similar characteristics and remaining maturity, adjusted by an amount for estimated credit losses inherent in the portfolio at the balance sheet date. The rates take into account the expected yield curve, as well as an adjustment for prepayment risk, when applicable. The Company classifies the estimated fair value of its loan portfolio as Level 3. The fair value for significant non-performing loans was based on recent external appraisals of collateral securing such loans, adjusted for the timing of anticipated cash flows. The Company classifies the estimated fair value of its non-performing loan portfolio as Level 3. Deposits The fair value of deposits with no stated maturity, such as non-interest bearing demand deposits and savings deposits, was equal to the amount payable on demand and classified as Level 1. The estimated fair value of certificates of deposit was based on the discounted value of contractual cash flows. The discount rate was estimated using the Company’s current rates offered for deposits with similar remaining maturities. The Company classifies the estimated fair value of its certificates of deposit portfolio as Level 2. Borrowed Funds The fair value of borrowed funds was estimated by discounting future cash flows using rates available for debt with similar terms and maturities and is classified by the Company as Level 2 within the fair value hierarchy. Commitments to Extend Credit and Letters of Credit The fair value of commitments to extend credit and letters of credit was 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 estimates of commitments to extend credit and letters of credit are deemed immaterial. 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 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. Significant assets and liabilities that are not considered financial assets or liabilities include goodwill and other intangibles, deferred tax assets and premises and equipment. 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. The following tables present the Company’s financial instruments at their carrying and fair values as of September 30, 2017 and December 31, 2016 . Fair values are presented by level within the fair value hierarchy. Fair Value Measurements at September 30, 2017 Using: (Dollars in thousands) Carrying value Fair value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial assets: Cash and cash equivalents $ 148,783 148,783 148,783 — — Securities available for sale: U.S. Treasury obligations 5,994 5,994 5,994 — — Agency obligations 28,035 28,035 28,035 — — Mortgage-backed securities 968,412 968,412 — 968,412 — State and municipal obligations 3,807 3,807 — 3,807 — Corporate obligations 21,459 21,459 — 21,459 — Equity securities 598 598 598 — — Total securities available for sale $ 1,028,305 1,028,305 34,627 993,678 — Investment securities held to maturity: Agency obligations 4,307 4,252 4,252 — — Mortgage-backed securities 475 492 — 492 — State and municipal obligations 467,113 475,759 — 475,759 — Corporate obligations 9,950 9,922 — 9,922 — Total securities held to maturity $ 481,845 490,425 4,252 486,173 — FHLBNY stock 70,896 70,896 70,896 — — Loans, net of allowance for loan losses 6,967,776 6,955,183 — — 6,955,183 Derivative assets 8,035 8,035 — 8,035 — Financial liabilities: Deposits other than certificates of deposits $ 5,963,348 5,963,348 5,963,348 — — Certificates of deposit 627,868 628,523 — 628,523 — Total deposits $ 6,591,216 6,591,871 5,963,348 628,523 — Borrowings 1,525,560 1,530,444 — 1,530,444 — Derivative liabilities 7,595 7,595 — 7,595 — Fair Value Measurements at December 31, 2016 Using: (Dollars in thousands) Carrying value Fair value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial assets: Cash and cash equivalents $ 144,297 144,297 144,297 — — Securities available for sale: U.S. Treasury obligations 8,008 8,008 8,008 — — Agency obligations 57,188 57,188 57,188 — — Mortgage-backed securities 951,861 951,861 — 951,861 — State and municipal obligations 3,743 3,743 — 3,743 — Corporate obligations 19,037 19,037 — 19,037 — Equity securities 549 549 549 — — Total securities available for sale $ 1,040,386 1,040,386 65,745 974,641 — Investment securities held to maturity: Agency obligations $ 4,306 4,225 4,225 — — Mortgage-backed securities 893 924 — 924 — State and municipal obligations 473,653 474,852 — 474,852 — Corporate obligations 9,331 9,286 — 9,286 — Total securities held to maturity $ 488,183 489,287 4,225 485,062 — FHLBNY stock 75,726 75,726 75,726 — — Loans, net of allowance for loan losses 6,941,603 6,924,440 — — 6,924,440 Derivative assets 7,441 7,441 — 7,441 — Financial liabilities: Deposits other than certificates of deposits $ 5,902,446 5,902,446 5,902,446 — — Certificates of deposit 651,183 653,772 — 653,772 — Total deposits $ 6,553,629 6,556,218 5,902,446 653,772 — Borrowings 1,612,745 1,617,023 — 1,617,023 — Derivative liabilities 6,750 6,750 — 6,750 —

Other Comprehensive Income (Los

Other Comprehensive Income (Loss)	9 Months Ended
	Sep. 30, 2017
Equity [Abstract]
Other Comprehensive Income (Loss)	Other Comprehensive Income (Loss) The following table presents the components of other comprehensive income (loss), both gross and net of tax, for the three and nine months ended September 30, 2017 and 2016 (in thousands): Three months ended September 30, 2017 2016 Before Tax Tax Effect After Tax Before Tax Tax Effect After Tax Components of Other Comprehensive Income: Unrealized gains and losses on securities available for sale: Net gains (losses) arising during the period $ 799 (320 ) 479 (2,575 ) 1,034 (1,541 ) Reclassification adjustment for gains included in net income — — — 43 (17 ) 26 Total 799 (320 ) 479 (2,532 ) 1,017 (1,515 ) Unrealized gains on derivatives (cash flow hedges) 90 (36 ) 54 384 (154 ) 230 Amortization related to post-retirement obligations 61 (25 ) 36 236 (95 ) 141 Total other comprehensive income (loss) $ 950 (381 ) 569 (1,912 ) 768 (1,144 ) Nine months ended September 30, 2017 2016 Before Tax After Before Tax After Components of Other Comprehensive Income: Unrealized gains and losses on securities available for sale: Net gains arising during the period $ 4,136 (1,658 ) 2,478 14,260 (5,727 ) 8,533 Reclassification adjustment for gains included in net income — — — (54 ) 22 (32 ) Total 4,136 (1,658 ) 2,478 14,206 (5,705 ) 8,501 Unrealized gains (losses) on derivatives (cash flow hedges) 177 (71 ) 106 (603 ) 242 (361 ) Amortization related to post-retirement obligations 183 (78 ) 105 635 (255 ) 380 Total other comprehensive income $ 4,496 (1,807 ) 2,689 14,238 (5,718 ) 8,520 The following tables present the changes in the components of accumulated other comprehensive income (loss), net of tax, for the three and nine months ended September 30, 2017 and 2016 (in thousands): Changes in Accumulated Other Comprehensive Income (Loss) by Component, net of tax for the three months ended September 30, 2017 2016 Unrealized Sale Post- Retirement Unrealized gains on Derivatives (cash flow hedges) Accumulated Unrealized for Sale Post- Retirement Unrealized (losses) on Derivatives (cash flow hedges) Accumulated Balance at $ 1,489 (2,987 ) 221 (1,277 ) 13,967 (6,185 ) (664 ) 7,118 Current period other comprehensive income (loss) 479 36 54 569 (1,515 ) 141 230 (1,144 ) Balance at September 30, $ 1,968 (2,951 ) 275 (708 ) 12,452 (6,044 ) (434 ) 5,974 Changes in Accumulated Other Comprehensive Income (Loss) by Component, net of tax for the nine months ended September 30, 2017 2016 Unrealized Sale Post- Retirement Unrealized gains on Derivatives (cash flow hedges) Accumulated Unrealized for Sale Post- Retirement Unrealized (losses) on Derivatives (cash flow hedges) Accumulated Balance at December 31, $ (510 ) (3,056 ) 169 (3,397 ) 3,951 (6,424 ) (73 ) (2,546 ) Current period other comprehensive income (loss) 2,478 105 106 2,689 8,501 380 (361 ) 8,520 Balance at September 30, $ 1,968 (2,951 ) 275 (708 ) 12,452 (6,044 ) (434 ) 5,974 The following tables summarize the reclassifications out of accumulated other comprehensive income to the consolidated statements of income for the three and nine months ended September 30, 2017 and 2016 (in thousands): Reclassifications From Accumulated Other Comprehensive Amount reclassified from AOCI for the three months ended September 30, Affected line item in the Consolidated 2017 2016 Details of AOCI: Securities available for sale: Realized net losses on the sale of securities available for sale $ — (43 ) Net gain on securities transactions — 17 Income tax expense — (26 ) Net of tax Post-retirement obligations: Amortization of actuarial losses 61 236 Compensation and employee benefits (1) (25 ) (95 ) Income tax expense 36 141 Net of tax Total reclassifications $ 36 115 Net of tax Reclassifications From Accumulated Other Comprehensive Amount reclassified from AOCI for the nine months ended September 30, Affected line item in the Consolidated 2017 2016 Details of AOCI: Securities available for sale: Realized net gains on the sale of securities available for sale $ — 54 Net gain on securities transactions — (22 ) Income tax expense — 32 Net of tax Post-retirement obligations: Amortization of actuarial losses 183 708 Compensation and employee benefits (1) (78 ) (284 ) Income tax expense 105 424 Net of tax Total reclassifications $ 105 456 Net of tax (1) This item is included in the computation of net periodic benefit cost. See Note 5. Components of Net Periodic Benefit Cost.

Derivatives and Hedging Activit

Derivatives and Hedging Activities	9 Months Ended
	Sep. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative and Hedging Activities	Derivative and Hedging Activities The Company is exposed to certain risks arising from both its business operations and economic conditions. The Company principally manages its exposures to a wide variety of business and operational risks through management of its core business activities. The Company manages economic risks, including interest rate, liquidity, and credit risk, primarily by managing the amount, sources, and duration of its assets and liabilities. Non-designated Hedges. Derivatives not designated in qualifying hedging relationships are not speculative and result from a service the Company provides to certain qualified commercial borrowers in loan related transactions and, therefore, are not used to manage interest rate risk in the Company’s assets or liabilities. The Company executes interest rate swaps with qualified commercial banking customers to facilitate their respective risk management strategies. Those interest rate swaps are simultaneously hedged by offsetting interest rate swaps that the Company executes with a third party, such that the Company minimizes its net risk exposure resulting from such transactions. The interest rate swap agreement which the Company executes with the commercial borrower is collateralized by the borrower's commercial real estate financed by the Company. The collateral exceeds the maximum potential amount of future payments under the credit derivative. As the interest rate swaps associated with this program do not meet the hedge accounting requirements, changes in the fair value of both the customer swaps and the offsetting swaps are recognized directly in earnings. At September 30, 2017 and December 31, 2016 , the Company had 46 interest rate swaps with an aggregate notional amount of $698.5 million and 36 interest rate swaps with an aggregate notional amount of $582.2 million , respectively, related to this program. The Company has credit derivatives resulting from participations in interest rate swaps provided to external lenders as part of loan participation arrangements; therefore, they are not used to manage interest rate risk in the Company's assets or liabilities. Cash Flow Hedges of Interest Rate Risk. The Company’s objective in using interest rate derivatives is to add stability to interest expense and to manage its exposure to interest rate movements. To accomplish this objective, the Company primarily uses interest rate swaps as part of its interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of variable amounts from a counterparty in exchange for the Company making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount. The effective portion of changes in the fair value of derivatives designated and that qualify as cash flow hedges are recorded in accumulated other comprehensive income and are subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings. During the three and nine months ended September 30, 2017 and 2016 , such derivatives were used to hedge the variable cash outflows associated with Federal Home Loan Bank borrowings. The ineffective portion of the change in fair value of the derivatives is recognized directly in earnings. During the three and nine months ended September 30, 2017 and 2016 , the Company did not record any hedge ineffectiveness. Amounts reported in accumulated other comprehensive income (loss) related to derivatives will be reclassified to interest expense as interest payments are made on the Company’s debt. During the next twelve months, the Company estimates that $52,400 will be reclassified as an increase to interest expense. As of September 30, 2017 , the Company had two outstanding interest rate derivatives with an aggregate notional amount of $60.0 million that was designated as a cash flow hedge of interest rate risk. The table below presents the fair value of the Company’s derivative financial instruments as well as their classification on the Consolidated Statements of Financial Condition at September 30, 2017 and December 31, 2016 (in thousands): At September 30, 2017 Asset Derivatives Liability Derivatives Consolidated Statements of Financial Condition Fair Value Consolidated Statements of Financial Condition Fair Value Derivatives not designated as a hedging instrument: Interest rate products Other assets $ 7,575 Other liabilities $ 7,595 Credit contracts Other assets 2 Other liabilities — Total derivatives not designated as a hedging instrument $ 7,577 $ 7,595 Derivatives designated as a a hedging instrument: Interest rate products Other assets $ 458 Other liabilities $ — Total derivatives designated as a hedging instrument $ 458 $ — At December 31, 2016 Asset Derivatives Liability Derivatives Consolidated Statements of Financial Condition Fair Value Consolidated Statements of Financial Condition Fair Value Derivatives not designated as a hedging instrument: Interest rate products Other assets $ 7,156 Other liabilities $ 6,750 Credit contracts Other assets 3 Other liabilities — Total derivatives not designated as a hedging instrument $ 7,159 $ 6,750 Derivatives designated as a a hedging instrument: Interest rate products Other assets $ 282 Other liabilities $ — Total derivatives designated as a hedging instrument $ 282 $ — The tables below present the effect of the Company’s derivative financial instruments on the Consolidated Statements of Income during the three and nine months ended September 30, 2017 and 2016 (in thousands). Gain (loss) recognized in Income on derivatives for the three months ended Consolidated Statements of Income September 30, 2017 September 30, 2016 Derivatives not designated as a hedging instrument: Interest rate products Other income (expense) $ (36 ) $ (95 ) Credit contracts Other income (expense) — 5 Total $ (36 ) $ (90 ) Derivatives designated as a hedging instrument: Interest rate products Other income (expense) $ (59 ) $ (129 ) Total $ (59 ) $ (129 ) Gain (loss) recognized in Income on derivatives for the nine months ended Consolidated Statements of Income September 30, 2017 September 30, 2016 Derivatives not designated as a hedging instrument: Interest rate products Other income (expense) $ (428 ) $ (1,060 ) Credit contracts Other income (expense) 1 103 Total $ (427 ) $ (957 ) Derivatives designated as a hedging instrument: Interest rate products Other income (expense) $ (166 ) $ (366 ) Total $ (166 ) $ (366 ) The Company has agreements with certain of its derivative counterparties that contain a provision that if the Company defaults on any of its indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender, then the Company could also be declared in default on its derivative obligations. In addition, the Company has agreements with certain of its derivative counterparties that contain a provision that if the Company fails to maintain its status as a well/adequately capitalized institution, then the counterparty could terminate the derivative positions and the Company would be required to settle its obligations under the agreements. As of September 30, 2017 , the termination value of derivatives in a net liability position, which includes accrued interest, was $2.5 million . The Company has minimum collateral posting thresholds with certain of its derivative counterparties, and has posted collateral of $3.1 million against its obligations under these agreements. If the Company had breached any of these provisions at September 30, 2017 , it could have been required to settle its obligations under the agreements at the termination value.

Summary of Significant Accoun17

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Basis of Financial Statement Presentation	Basis of Financial Statement Presentation The accompanying unaudited consolidated financial statements include the accounts of Provident Financial Services, Inc. and its wholly owned subsidiary, Provident Bank (the “Bank,” together with Provident Financial Services, Inc., the “Company”). In preparing the interim unaudited 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 consolidated statements of financial condition and the consolidated statements of income for the periods presented. Actual results could differ from these estimates. The allowance for loan losses, the valuation of securities available for sale and the valuation of deferred tax assets are material estimates that are particularly susceptible to near-term change. The interim unaudited consolidated financial statements reflect all normal and recurring adjustments, which are, in the opinion of management, considered necessary for a fair presentation of the financial condition and results of operations for the periods presented. The results of operations for the three and nine months ended September 30, 2017 are not necessarily indicative of the results of operations that may be expected for all of 2017 . Certain information and note disclosures normally included in financial statements prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission. Certain reclassifications have been made in the consolidated financial statements to conform with current year classifications. These unaudited consolidated financial statements should be read in conjunction with the December 31, 2016 Annual Report to Stockholders on Form 10-K.
Impact of Recent Accounting Pronouncements	Impact of Recent Accounting Pronouncements In August 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update ("ASU") 2017-12, Derivatives and Hedging: Targeted Improvements to Accounting for Hedging Activities (ASU 2017-12). The purpose of this updated guidance is to better align a company’s financial reporting for hedging activities with the economic objectives of those activities. ASU 2017-12 is effective for public business entities for fiscal years beginning after December 15, 2018, with early adoption, including adoption in an interim period, permitted. ASU 2017-12 requires a modified retrospective transition method in which the Company will recognize the cumulative effect of the change on the opening balance of each affected component of equity in the statement of financial position as of the date of adoption. The Company is currently assessing the impact that the guidance will have on the Company’s consolidated financial statements. In May 2017, the FASB issued ASU 2017-09, “Compensation-Stock Compensation (Topic 718): Scope of Modification Accounting”. This update provides guidance about changes to terms or conditions of a share-based payment award which would require modification accounting. In particular, an entity is required to account for the effects of a modification if the fair value, vesting condition or the equity/liability classification of the modified award is not the same immediately before and after a change to the terms and conditions of the award. ASU 2017-09 is effective on a prospective basis for fiscal years beginning after December 15, 2017, with early adoption permitted. The Company does not expect ASU 2017-09 to have a significant impact on the Company's consolidated financial statements. In March 2017, the FASB issued ASU 2017-08, “Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities.” This ASU shortens the amortization period for premiums on callable debt securities by requiring that premiums be amortized to the first (or earliest) call date instead of as an adjustment to the yield over the contractual life. This change more closely aligns the accounting with the economics of a callable debt security and the amortization period with expectations that already are included in market pricing on callable debt securities. This ASU does not change the accounting for discounts on callable debt securities, which will continue to be amortized to the maturity date. This guidance includes only instruments that are held at a premium and have explicit call features. It does not include instruments that contain prepayment features, such as mortgage backed securities; nor does it include call options that are contingent upon future events or in which the timing or amount to be paid is not fixed. The effective date for this ASU is fiscal years beginning after December 15, 2018, including interim periods within the reporting period, with early adoption permitted. Transition is on a modified retrospective basis with an adjustment to retained earnings as of the beginning of the period of adoption. If early adopted in an interim period, adjustments should be reflected as of the beginning of the fiscal year that includes that interim period. The Company is currently assessing the impact that the guidance will have on the Company’s consolidated financial statements. In March 2017, the FASB issued ASU 2017-07, "Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Post-retirement Benefit Cost", which requires that companies disaggregate the service cost component from other components of net benefit cost. This update calls for companies that offer post-retirement benefits to present the service cost, which is the amount an employer has to set aside each quarter or fiscal year to cover the benefits, in the same line item with other current employee compensation costs. Other components of net benefit cost will be presented in the income statement separately from the service cost component and outside the subtotal of income from operations, if one is presented. ASU 2017-07 is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The Company does not expect ASU 2017-07 to have a significant impact on the Company's consolidated financial statements. In January 2017, the FASB issued ASU 2017-04, “Simplifying the Test for Goodwill Impairment.” The main objective of this ASU is to simplify the accounting for goodwill impairment by requiring that impairment charges be based upon the first step in the current two-step impairment test under Accounting Standards Codification (ASC) 350. Currently, if the fair value of a reporting unit is lower than its carrying amount (Step 1), an entity calculates any impairment charge by comparing the implied fair value of goodwill with its carrying amount (Step 2). The implied fair value of goodwill is calculated by deducting the fair value of all assets and liabilities of the reporting unit from the reporting unit’s fair value as determined in Step 1. To determine the implied fair value of goodwill, entities estimate the fair value of any unrecognized intangible assets and any corporate-level assets or liabilities that were included in the determination of the carrying amount and fair value of the reporting unit in Step 1. Under ASU 2017-04, if a reporting unit’s carrying amount exceeds its fair value, an entity will record an impairment charge based on that difference. The impairment charge will be limited to the amount of goodwill allocated to that reporting unit. This standard eliminates the requirement to calculate a goodwill impairment charge using Step 2. ASU 2017-04 does not change the guidance on completing Step 1 of the goodwill impairment test. Under ASU 2017-04, an entity will still be able to perform the current optional qualitative goodwill impairment assessment before determining whether to proceed to Step 1. The standard will be applied prospectively and is effective for annual and interim impairment tests performed in periods beginning after December 15, 2019. Early adoption is permitted for annual and interim goodwill impairment testing dates after January 1, 2017. The Company does not expect ASU 2017-04 to have a significant impact on the Company's consolidated financial statements. In August 2016, the FASB issued ASU 2016-15, "Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments," a new standard which addresses diversity in practice related to eight specific cash flow issues: debt prepayment or extinguishment costs, settlement of zero-coupon debt instruments or other debt instruments with coupon interest rates that are insignificant in relation to the effective interest rate of the borrowing, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, proceeds from the settlement of corporate-owned life insurance policies (including bank-owned life insurance policies), distributions received from equity method investees, beneficial interests in securitization transactions and separately identifiable cash flows and application of the predominance principle. ASU 2016-15 is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Entities will apply the standard’s provisions using a retrospective transition method to each period presented. If it is impracticable to apply the amendments retrospectively for some of the issues, the amendments for those issues would be applied prospectively as of the earliest date practicable. The Company is currently assessing the impact that the guidance will have on the Company’s consolidated financial statements. In June 2016, the FASB issued ASU 2016-13, “Measurement of Credit Losses on Financial Instruments.” The main objective of this ASU is to provide financial statement users with more decision-useful information about the expected credit losses on financial instruments by a reporting entity at each reporting date. The amendments in this ASU require financial assets measured at amortized cost to be presented at the net amount expected to be collected. The allowance for credit losses would represent a valuation account that would be deducted from the amortized cost basis of the financial asset(s) to present the net carrying value at the amount expected to be collected on the financial asset. The income statement would reflect the measurement of credit losses for newly recognized financial assets, as well as the expected increases or decreases of expected credit losses that have taken place during the period. The measurement of expected credit losses would be based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. An entity will be required to use judgment in determining the relevant information and estimation methods that are appropriate in its circumstances. The amendments in ASU 2016-13 are effective for fiscal years, including interim periods, beginning after December 15, 2019. Early adoption of this ASU is permitted for fiscal years beginning after December 15, 2018. The Company is currently evaluating the potential impact of ASU 2016-13 on the consolidated financial statements. In that regard, the Company has formed a cross-functional working group, under the direction of the Chief Credit Officer, Chief Financial Officer and Chief Risk Officer. The working group is comprised of individuals from various functional areas including credit, risk management, finance and information technology, among others. The Company is currently developing an implementation plan to include assessment of processes, portfolio segmentation, model development, system requirements and the identification of data and resource needs, among other things. Also, the Company is currently evaluating third-party vendor solutions to assist us in the application of the ASU 2016-13. The adoption of the ASU 2016-13 may result in an increase in the allowance for loan losses as a result of changing from an "incurred loss" model, which encompasses allowances for current known and inherent losses within the portfolio, to an "expected loss" model, which encompasses allowances for losses expected to be incurred over the life of the portfolio. Furthermore, ASU 2016-13 will necessitate establishing an allowance for expected credit losses on debt securities. The Company is currently unable to reasonably estimate the impact of adopting ASU 2016-13, it is expected that the impact of adoption will be significantly influenced by the composition, characteristics and quality of our loan and securities portfolios as well as the prevailing economic conditions and forecasts as of the adoption date. In February 2016, the FASB issued ASU 2016-02, "Leases (Topic 842).” This ASU requires all lessees to recognize a lease liability and a right-of-use asset, measured at the present value of the future minimum lease payments, at the lease commencement date. Lessor accounting remains largely unchanged under the new guidance. The guidance is effective for fiscal years beginning after December 15, 2018, including interim reporting periods within that reporting period, with early adoption permitted. A modified retrospective approach must be applied for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements. The Company is currently assessing the impact that the guidance will have on the Company's consolidated financial statements. In January 2016, the FASB issued ASU 2016-01, "Financial Instruments - Overall: Recognition and Measurement of Financial Assets and Liabilities." This ASU addresses certain aspects of recognition, measurement, presentation, and disclosure of financial instruments. This amendment supersedes the guidance to classify equity securities with readily determinable fair values into different categories, requires equity securities, except equity method investments, to be measured at fair value with changes in the fair value recognized through net income, and simplifies the impairment assessment of equity investments without readily determinable fair values. The amendment requires public business entities that are required to disclose the fair value of financial instruments measured at amortized cost on the balance sheet to measure that fair value using the exit price notion. The amendment requires an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option. The amendment requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or in the accompanying notes to the financial statements. The amendment reduces diversity in current practice by clarifying that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available for sale securities in combination with the entity’s other deferred tax assets. This amendment is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Entities should apply the amendment by means of a cumulative-effect adjustment as of the beginning of the fiscal year of adoption, with the exception of the amendment related to equity securities without readily determinable fair values, which should be applied prospectively to equity investments that exist as of the date of adoption. The Company is currently evaluating the impact that the guidance will have on the Company's consolidated financial statements. In May 2014, the FASB issued ASU 2014-09, "Revenue from Contracts with Customers (Topic 606)." The objective of this amendment is to clarify the principles for recognizing revenue and to develop a common revenue standard for U.S. GAAP and IFRS. This update affects any entity that either enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of nonfinancial assets unless those contracts are in the scope of other standards. The ASU is effective for public business entities for financial statements issued for fiscal years beginning after December 15, 2017, and early adoption is permitted. Subsequently, the FASB issued the following standards related to ASU 2014-09: ASU 2016-08, “Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations;” ASU 2016-10, “Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing;” ASU 2016-11, “Revenue Recognition (Topic 605) and Derivatives and Hedging (Topic 815): Rescission of SEC Guidance Because of Accounting Standards Updates 2014-09 and 2014-16 Pursuant to Staff Announcements at the March 3, 2016 EITF Meeting;” and ASU 2016-12, “Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients.” These amendments are intended to improve and clarify the implementation guidance of ASU 2014-09 and have the same effective date as the original standard. The Company's revenue is comprised of net interest income on interest earning assets and liabilities and non-interest income. The scope of guidance explicitly excludes net interest income as well as other revenues associated with financial assets and liabilities, including loans, leases, securities and derivatives. Accordingly, the majority of the Company's revenues will not be affected. The Company has formed a working group to guide implementation efforts including the identification of revenue within the scope of the guidance, as well as the evaluation of revenue contracts and the respective performance obligations within those contracts. While the Company has not identified any material changes related to the timing or amount of revenue recognition, the Company will continue to evaluate disaggregation for significant categories of revenue in the scope of the guidance and the need for additional disclosures. The Company will adopt the standard in the first quarter of 2018 with a cumulative effect adjustment to opening retained earnings, if such adjustment is deemed to be significant.

Summary of Significant Accoun18

Summary of Significant Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Reconciliation of Numerators and Denominators of Basic and Diluted Earnings Per Share Calculations	The following is a reconciliation of the numerators and denominators of the basic and diluted earnings per share calculations for the three and nine months ended September 30, 2017 and 2016 (dollars in thousands, except per share amounts): Three months ended September 30, 2017 2016 Net Income Weighted Average Common Shares Outstanding Per Share Amount Net Income Weighted Average Common Shares Outstanding Per Share Amount Net income $ 26,575 $ 22,906 Basic earnings per share: Income available to common stockholders $ 26,575 64,454,684 $ 0.41 $ 22,906 63,728,393 $ 0.36 Dilutive shares 190,594 206,493 Diluted earnings per share: Income available to common stockholders $ 26,575 64,645,278 $ 0.41 $ 22,906 63,934,886 $ 0.36 Nine months ended September 30, 2017 2016 Net Income Weighted Average Common Shares Outstanding Per Share Amount Net Income Weighted Average Common Shares Outstanding Per Share Amount Net income $ 74,466 $ 65,235 Basic earnings per share: Income available to common stockholders $ 74,466 64,327,640 $ 1.16 $ 65,235 63,545,065 $ 1.03 Dilutive shares 192,070 182,658 Diluted earnings per share: Income available to common stockholders $ 74,466 64,519,710 $ 1.15 $ 65,235 63,727,723 $ 1.02

Investment Securities (Tables)

Investment Securities (Tables)	9 Months Ended
	Sep. 30, 2017
Fair Value, Option, Quantitative Disclosures [Line Items]
Securities Available for Sale	The following tables present the amortized cost, gross unrealized gains, gross unrealized losses and the fair value for securities available for sale at September 30, 2017 and December 31, 2016 (in thousands): September 30, 2017 Amortized Gross Gross Fair U.S. Treasury obligations $ 5,995 — (1 ) 5,994 Agency obligations 28,031 15 (11 ) 28,035 Mortgage-backed securities 965,863 7,477 (4,928 ) 968,412 State and municipal obligations 3,695 112 — 3,807 Corporate obligations 21,049 420 (10 ) 21,459 Equity securities 397 201 — 598 $ 1,025,030 8,225 (4,950 ) 1,028,305 December 31, 2016 Amortized Gross Gross Fair U.S. Treasury obligations $ 7,995 13 — 8,008 Agency obligations 57,123 90 (25 ) 57,188 Mortgage-backed securities 952,992 7,249 (8,380 ) 951,861 State and municipal obligations 3,727 19 (3 ) 3,743 Corporate obligations 19,013 35 (11 ) 19,037 Equity securities 397 152 — 549 $ 1,041,247 7,558 (8,419 ) 1,040,386
Available for sale securities with temporary impairment	The following tables present the fair value and gross unrealized losses for securities available for sale with temporary impairment at September 30, 2017 and December 31, 2016 (in thousands): September 30, 2017 Unrealized Losses Less than 12 months 12 months or longer Total Fair value Gross unrealized losses Fair value Gross unrealized losses Fair value Gross unrealized losses U.S. Treasury obligations $ 5,994 (1 ) — — 5,994 (1 ) Agency obligations 16,008 (11 ) — — 16,008 (11 ) Mortgage-backed securities 424,627 (3,956 ) 50,881 (972 ) 475,508 (4,928 ) Corporate obligations — — 991 (10 ) 991 (10 ) $ 446,629 (3,968 ) 51,872 (982 ) 498,501 (4,950 ) December 31, 2016 Unrealized Losses Less than 12 months 12 months or longer Total Fair value Gross unrealized losses Fair value Gross unrealized losses Fair value Gross unrealized losses Agency obligations $ 14,000 (25 ) — — 14,000 (25 ) Mortgage-backed securities 553,629 (8,377 ) 65 (3 ) 553,694 (8,380 ) State and municipal obligations 661 (3 ) — — 661 (3 ) Corporate obligations — — 990 (11 ) 990 (11 ) $ 568,290 (8,405 ) 1,055 (14 ) 569,345 (8,419 )
Investment Securities Held to Maturity	The following tables present the amortized cost, gross unrealized gains, gross unrealized losses and the estimated fair value for investment securities held to maturity at September 30, 2017 and December 31, 2016 (in thousands): September 30, 2017 Amortized cost Gross unrealized gains Gross unrealized losses Fair value Agency obligations $ 4,307 — (55 ) 4,252 Mortgage-backed securities 475 17 — 492 State and municipal obligations 467,113 10,407 (1,761 ) 475,759 Corporate obligations 9,950 6 (34 ) 9,922 $ 481,845 10,430 (1,850 ) 490,425 December 31, 2016 Amortized cost Gross unrealized gains Gross unrealized losses Fair value Agency obligations $ 4,306 2 (83 ) 4,225 Mortgage-backed securities 893 31 — 924 State and municipal obligations 473,653 6,635 (5,436 ) 474,852 Corporate obligations 9,331 7 (52 ) 9,286 $ 488,183 6,675 (5,571 ) 489,287 The following tables present the fair value and gross unrealized losses for investment securities held to maturity with temporary impairment at September 30, 2017 and December 31, 2016 (in thousands): September 30, 2017 Unrealized Losses Less than 12 months 12 months or longer Total Fair value Gross unrealized losses Fair value Gross unrealized losses Fair value Gross unrealized losses Agency obligations $ 3,853 (55 ) — — 3,853 (55 ) State and municipal obligations 62,881 (938 ) 22,251 (823 ) 85,132 (1,761 ) Corporate obligations 6,646 (34 ) — — 6,646 (34 ) $ 73,380 (1,027 ) 22,251 (823 ) 95,631 (1,850 ) December 31, 2016 Unrealized Losses Less than 12 months 12 months or longer Total Fair Gross Fair Gross Fair Gross Agency obligations $ 3,525 (83 ) — — 3,525 (83 ) State and municipal obligations 172,152 (5,132 ) 6,617 (304 ) 178,769 (5,436 ) Corporate obligations 4,697 (52 ) — — 4,697 (52 ) $ 180,374 (5,267 ) 6,617 (304 ) 186,991 (5,571 )
Available-for-sale Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Investment Securities Classified by Contractual Maturity	The amortized cost and fair value of securities available for sale at September 30, 2017 , by contractual maturity, are shown below (in thousands). Expected maturities may differ from contractual maturities due to prepayment or early call privileges of the issuer. September 30, 2017 Amortized cost Fair value Due in one year or less $ 35,452 35,445 Due after one year through five years 2,423 2,471 Due after five years through ten years 20,895 21,379 Due after ten years — — $ 58,770 59,295
Held-to-maturity Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Investment Securities Classified by Contractual Maturity	The amortized cost and fair value of investment securities in the held to maturity portfolio at September 30, 2017 by contractual maturity are shown below (in thousands). Expected maturities may differ from contractual maturities due to prepayment or early call privileges of the issuer. September 30, 2017 Amortized cost Fair value Due in one year or less $ 14,723 14,755 Due after one year through five years 65,170 66,276 Due after five years through ten years 254,191 259,908 Due after ten years 147,286 148,994 $ 481,370 489,933

Loans Receivable and Allowanc20

Loans Receivable and Allowance for Loan Losses (Tables)	9 Months Ended
	Sep. 30, 2017
Receivables [Abstract]
Schedule of Summarized Loans Receivable	Loans receivable at September 30, 2017 and December 31, 2016 are summarized as follows (in thousands): September 30, 2017 December 31, 2016 Mortgage loans: Residential $ 1,157,311 1,211,672 Commercial 2,022,576 1,978,569 Multi-family 1,334,984 1,402,054 Construction 324,692 264,814 Total mortgage loans 4,839,563 4,857,109 Commercial loans 1,708,842 1,630,444 Consumer loans 481,262 516,755 Total gross loans 7,029,667 7,004,308 Purchased credit-impaired ("PCI") loans 991 1,272 Premiums on purchased loans 4,229 4,968 Unearned discounts (36 ) (39 ) Net deferred fees (6,799 ) (7,023 ) Total loans $ 7,028,052 7,003,486
Summary of Aging Loans Receivable by Portfolio Segment and Class	The following tables summarize the aging of loans receivable by portfolio segment and class of loans, excluding PCI loans (in thousands): September 30, 2017 30-59 Days 60-89 Days Non-accrual Recorded Total Past Due Current Total Loans Receivable Mortgage loans: Residential $ 5,973 3,525 8,820 — 18,318 1,138,993 1,157,311 Commercial 608 292 8,070 — 8,970 2,013,606 2,022,576 Multi-family — — — — — 1,334,984 1,334,984 Construction — — — — — 324,692 324,692 Total mortgage loans 6,581 3,817 16,890 — 27,288 4,812,275 4,839,563 Commercial loans 1,870 244 17,523 — 19,637 1,689,205 1,708,842 Consumer loans 2,307 1,080 2,035 — 5,422 475,840 481,262 Total gross loans $ 10,758 5,141 36,448 — 52,347 6,977,320 7,029,667 December 31, 2016 30-59 Days 60-89 Days Non-accrual Recorded Total Past Current Total Loans Receivable Mortgage loans: Residential $ 5,891 6,563 12,021 — 24,475 1,187,197 1,211,672 Commercial — 80 7,493 — 7,573 1,970,996 1,978,569 Multi-family — — 553 — 553 1,401,501 1,402,054 Construction — — 2,517 — 2,517 262,297 264,814 Total mortgage loans 5,891 6,643 22,584 — 35,118 4,821,991 4,857,109 Commercial loans 1,656 357 16,787 — 18,800 1,611,644 1,630,444 Consumer loans 2,561 1,199 3,030 — 6,790 509,965 516,755 Total gross loans $ 10,108 8,199 42,401 — 60,708 6,943,600 7,004,308
Summary of Loans Receivable by Portfolio Segment and Impairment Method	The following table summarizes loans receivable by portfolio segment and impairment method, excluding PCI loans (in thousands): September 30, 2017 Mortgage loans Commercial loans Consumer loans Total Portfolio Segments Individually evaluated for impairment $ 28,578 19,393 2,210 50,181 Collectively evaluated for impairment 4,810,985 1,689,449 479,052 6,979,486 Total gross loans $ 4,839,563 1,708,842 481,262 7,029,667 December 31, 2016 Mortgage loans Commercial loans Consumer loans Total Portfolio Segments Individually evaluated for impairment $ 29,551 20,255 2,213 52,019 Collectively evaluated for impairment 4,827,558 1,610,189 514,542 6,952,289 Total gross loans $ 4,857,109 1,630,444 516,755 7,004,308
Summary of Allowance for Loan Losses by Portfolio Segment and Impairment Classification	The allowance for loan losses is summarized by portfolio segment and impairment classification as follows (in thousands): September 30, 2017 Mortgage loans Commercial loans Consumer loans Total Individually evaluated for impairment $ 1,773 1,028 71 2,872 Collectively evaluated for impairment 24,724 30,423 2,257 57,404 Total gross loans $ 26,497 31,451 2,328 60,276 December 31, 2016 Mortgage loans Commercial loans Consumer loans Total Individually evaluated for impairment $ 1,986 268 80 2,334 Collectively evaluated for impairment 27,640 28,875 3,034 59,549 Total gross loans $ 29,626 29,143 3,114 61,883
Schedule of Troubled Debt Restructuring	The following tables present the number of loans modified as TDRs during the three and nine months ended September 30, 2017 and 2016 , along with their balances immediately prior to the modification date and post-modification as of September 30, 2017 and 2016 . There were no loans modified as TDRs during the three and nine months ended September 30, 2016 . For the three months ended September 30, 2017 September 30, 2016 Troubled Debt Restructurings Number of Loans Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Number of Loans Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment ($ in thousands) Mortgage loans: Residential 2 $ 632 $ 470 — $ — $ — Total mortgage loans 2 632 470 — — — Total restructured loans 2 $ 632 $ 470 — $ — $ — For the nine months ended September 30, 2017 September 30, 2016 Troubled Debt Restructurings Number of Pre-Modification Post-Modification Number of Pre-Modification Post-Modification ($ in thousands) Mortgage loans: Residential 7 $ 3,436 $ 3,202 — $ — $ — Total mortgage loans 7 3,436 3,202 — — — Commercial loans 1 1,300 1,210 — — — Consumer loans 1 70 68 — — — Total restructured loans 9 $ 4,806 $ 4,480 — $ — $ —
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period	The following table summarizes the changes in the accretable yield for PCI loans during the three and nine months ended September 30, 2017 and 2016 (in thousands): Three months ended September 30, Nine months ended September 30, 2017 2016 2017 2016 Beginning balance $ 158 328 200 676 Accretion (154 ) (225 ) (299 ) (1,065 ) Reclassification from non-accretable discount 99 209 202 701 Ending balance $ 103 312 103 312
Schedule of Allowance for Loan Losses by Portfolio Segment	The activity in the allowance for loan losses by portfolio segment for the three and nine months ended September 30, 2017 and 2016 was as follows (in thousands): Three months ended September 30, Mortgage loans Commercial loans Consumer loans Total Portfolio Segments Unallocated Total 2017 Balance at beginning of period $ 28,826 31,085 2,951 62,862 — 62,862 Provision charged (credited) to operations (2,301 ) 3,446 (645 ) 500 — 500 Recoveries of loans previously charged-off 4 140 291 435 — 435 Loans charged-off (32 ) (3,220 ) (269 ) (3,521 ) — (3,521 ) Balance at end of period $ 26,497 31,451 2,328 60,276 — 60,276 2016 Balance at beginning of period $ 31,634 26,299 3,000 60,933 — 60,933 Provision charged (credited) to operations (1,599 ) 2,378 221 1,000 — 1,000 Recoveries of loans previously charged-off 2 68 160 230 — 230 Loans charged-off (383 ) (506 ) (186 ) (1,075 ) — (1,075 ) Balance at end of period $ 29,654 28,239 3,195 61,088 — 61,088 Nine months ended September 30, Mortgage Commercial Consumer Total Portfolio Unallocated Total 2017 Balance at beginning of period $ 29,626 29,143 3,114 61,883 — 61,883 Provision charged (credited) to operations (2,724 ) 6,840 (416 ) 3,700 — 3,700 Recoveries of loans previously charged-off 65 671 692 1,428 — 1,428 Loans charged-off (470 ) (5,203 ) (1,062 ) (6,735 ) — (6,735 ) Balance at end of period $ 26,497 31,451 2,328 60,276 — 60,276 2016 Balance at beginning of period $ 32,094 25,829 3,501 61,424 — 61,424 Provision charged (credited) to operations (2,294 ) 6,647 (153 ) 4,200 — 4,200 Recoveries of loans previously charged-off 575 351 697 1,623 — 1,623 Loans charged-off (721 ) (4,588 ) (850 ) (6,159 ) — (6,159 ) Balance at end of period $ 29,654 28,239 3,195 61,088 — 61,088
Summary of Impaired Loans Receivable by Class	The following table presents loans individually evaluated for impairment by class and loan category, excluding PCI loans (in thousands): September 30, 2017 December 31, 2016 Unpaid Principal Balance Recorded Investment Related Allowance Average Recorded Investment Interest Income Recognized Unpaid Principal Balance Recorded Investment Related Allowance Average Recorded Investment Interest Income Recognized Loans with no related allowance Mortgage loans: Residential $ 13,035 10,277 — 10,391 340 10,691 7,881 — 8,027 484 Commercial 4,600 4,472 — 4,496 — 1,556 1,556 — 1,586 40 Construction — — — — — 2,553 2,517 — 2,514 — Total 17,635 14,749 — 14,887 340 14,800 11,954 — 12,127 524 Commercial loans 17,505 13,884 — 13,954 280 21,830 18,874 — 13,818 259 Consumer loans 1,606 1,067 — 1,186 51 1,493 981 — 1,026 59 Total impaired loans $ 36,746 29,700 — 30,027 671 38,123 31,809 — 26,971 842 Loans with an allowance recorded Mortgage loans: Residential $ 13,803 12,759 1,633 12,873 374 14,169 13,520 1,716 13,705 519 Commercial 1,071 1,070 140 1,083 40 4,138 4,077 270 4,111 55 Construction — — — — — — — — — — Total 14,874 13,829 1,773 13,956 414 18,307 17,597 1,986 17,816 574 Commercial loans 6,158 5,509 1,028 6,045 52 1,381 1,381 268 5,956 4 Consumer loans 1,154 1,143 71 1,170 47 1,242 1,232 80 1,259 66 Total impaired loans $ 22,186 20,481 2,872 21,171 513 20,930 20,210 2,334 25,031 644 Total impaired loans Mortgage loans: Residential $ 26,838 23,036 1,633 23,264 714 24,860 21,401 1,716 21,732 1,003 Commercial 5,671 5,542 140 5,579 40 5,694 5,633 270 5,697 95 Construction — — — — — 2,553 2,517 — 2,514 — Total 32,509 28,578 1,773 28,843 754 33,107 29,551 1,986 29,943 1,098 Commercial loans 23,663 19,393 1,028 19,999 332 23,211 20,255 268 19,774 263 Consumer loans 2,760 2,210 71 2,356 98 2,735 2,213 80 2,285 125 Total impaired loans $ 58,932 50,181 2,872 51,198 1,184 59,053 52,019 2,334 52,002 1,486
Summary of Loans Receivable by Credit Quality Risk Rating Indicator	Loans receivable by credit quality risk rating indicator, excluding PCI loans, are as follows (in thousands): At September 30, 2017 Residential Commercial mortgage Multi- family Construction Total mortgages Commercial Consumer Total loans Special mention $ 3,525 19,437 16 — 22,978 26,156 1,080 50,214 Substandard 8,820 25,633 — — 34,453 30,361 2,034 66,848 Doubtful — — — — — 771 — 771 Loss — — — — — — — — Total classified and criticized 12,345 45,070 16 — 57,431 57,288 3,114 117,833 Pass/Watch 1,144,966 1,977,506 1,334,968 324,692 4,782,132 1,651,554 478,148 6,911,834 Total $ 1,157,311 2,022,576 1,334,984 324,692 4,839,563 1,708,842 481,262 7,029,667 At December 31, 2016 Residential Commercial mortgage Multi- family Construction Total mortgages Commercial Consumer Total loans Special mention $ 6,563 25,329 563 — 32,455 14,840 1,242 48,537 Substandard 12,021 23,011 553 2,517 38,102 47,255 2,940 88,297 Doubtful — — — — — — — — Loss — — — — — — — — Total classified and criticized 18,584 48,340 1,116 2,517 70,557 62,095 4,182 136,834 Pass/Watch 1,193,088 1,930,229 1,400,938 262,297 4,786,552 1,568,349 512,573 6,867,474 Total $ 1,211,672 1,978,569 1,402,054 264,814 4,857,109 1,630,444 516,755 7,004,308

Deposits (Tables)

Deposits (Tables)	9 Months Ended
	Sep. 30, 2017
Banking and Thrift [Abstract]
Schedule of Deposits	Deposits at September 30, 2017 and December 31, 2016 are summarized as follows (in thousands): September 30, 2017 December 31, 2016 Savings $ 1,083,215 1,099,020 Money market 1,539,064 1,582,750 NOW 1,972,220 1,871,298 Non-interest bearing 1,368,849 1,349,378 Certificates of deposit 627,868 651,183 Total deposits $ 6,591,216 6,553,629

Components of Net Periodic Be22

Components of Net Periodic Benefit Cost (Tables)	9 Months Ended
	Sep. 30, 2017
Retirement Benefits [Abstract]
Net Periodic Benefit Cost (Increase)	Net periodic (increase) benefit cost for pension benefits and other post-retirement benefits for the three and nine months ended September 30, 2017 and 2016 includes the following components (in thousands): Three months ended September 30, Nine months ended September 30, Pension benefits Other post- retirement benefits Pension benefits Other post- retirement benefits 2017 2016 2017 2016 2017 2016 2017 2016 Service cost $ — — 26 37 $ — — 78 112 Interest cost 306 312 218 285 920 936 654 854 Expected return on plan assets (637 ) (612 ) — — (1,913 ) (1,836 ) — — Amortization of prior service cost — — — — — — — — Amortization of the net loss 230 236 (169 ) — 690 708 (507 ) — Net periodic (increase) benefit cost $ (101 ) (64 ) 75 322 $ (303 ) (192 ) 225 966

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Assets and Liabilities Reported on Consolidated Statements of Financial Condition at Fair Values	The following tables present the assets and liabilities reported on the consolidated statements of financial condition at their fair values as of September 30, 2017 and December 31, 2016 , by level within the fair value hierarchy: Fair Value Measurements at Reporting Date Using: (In thousands) September 30, 2017 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Measured on a recurring basis: Securities available for sale: U.S. Treasury obligations $ 5,994 5,994 — — Agency obligations 28,035 28,035 — — Mortgage-backed securities 968,412 — 968,412 — State and municipal obligations 3,807 — 3,807 — Corporate obligations 21,459 — 21,459 — Equity securities 598 598 — — Total securities available for sale 1,028,305 34,627 993,678 — Derivative assets 8,035 — 8,035 — $ 1,036,340 34,627 1,001,713 — Derivative liabilities $ 7,595 — 7,595 — Measured on a non-recurring basis: Loans measured for impairment based on the fair value of the underlying collateral $ 5,525 — — 5,525 Foreclosed assets 5,703 — — 5,703 $ 11,228 — — 11,228 Fair Value Measurements at Reporting Date Using: (In thousands) December 31, 2016 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Measured on a recurring basis: Securities available for sale: U.S. Treasury obligations $ 8,008 8,008 — — Agency obligations 57,188 57,188 — — Mortgage-backed securities 951,861 — 951,861 — State and municipal obligations 3,743 — 3,743 — Corporate obligations 19,037 — 19,037 — Equity securities 549 549 — — Total securities available for sale $ 1,040,386 65,745 974,641 — Derivative assets 7,441 — 7,441 — $ 1,047,827 65,745 982,082 — Derivative liabilities $ 6,750 — 6,750 — Measured on a non-recurring basis: Loans measured for impairment based on the fair value of the underlying collateral $ 11,001 — — 11,001 Foreclosed assets 7,991 — — 7,991 $ 18,992 — — 18,992
Schedule of Financial Instruments at Carrying and Fair Values	The following tables present the Company’s financial instruments at their carrying and fair values as of September 30, 2017 and December 31, 2016 . Fair values are presented by level within the fair value hierarchy. Fair Value Measurements at September 30, 2017 Using: (Dollars in thousands) Carrying value Fair value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial assets: Cash and cash equivalents $ 148,783 148,783 148,783 — — Securities available for sale: U.S. Treasury obligations 5,994 5,994 5,994 — — Agency obligations 28,035 28,035 28,035 — — Mortgage-backed securities 968,412 968,412 — 968,412 — State and municipal obligations 3,807 3,807 — 3,807 — Corporate obligations 21,459 21,459 — 21,459 — Equity securities 598 598 598 — — Total securities available for sale $ 1,028,305 1,028,305 34,627 993,678 — Investment securities held to maturity: Agency obligations 4,307 4,252 4,252 — — Mortgage-backed securities 475 492 — 492 — State and municipal obligations 467,113 475,759 — 475,759 — Corporate obligations 9,950 9,922 — 9,922 — Total securities held to maturity $ 481,845 490,425 4,252 486,173 — FHLBNY stock 70,896 70,896 70,896 — — Loans, net of allowance for loan losses 6,967,776 6,955,183 — — 6,955,183 Derivative assets 8,035 8,035 — 8,035 — Financial liabilities: Deposits other than certificates of deposits $ 5,963,348 5,963,348 5,963,348 — — Certificates of deposit 627,868 628,523 — 628,523 — Total deposits $ 6,591,216 6,591,871 5,963,348 628,523 — Borrowings 1,525,560 1,530,444 — 1,530,444 — Derivative liabilities 7,595 7,595 — 7,595 — Fair Value Measurements at December 31, 2016 Using: (Dollars in thousands) Carrying value Fair value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial assets: Cash and cash equivalents $ 144,297 144,297 144,297 — — Securities available for sale: U.S. Treasury obligations 8,008 8,008 8,008 — — Agency obligations 57,188 57,188 57,188 — — Mortgage-backed securities 951,861 951,861 — 951,861 — State and municipal obligations 3,743 3,743 — 3,743 — Corporate obligations 19,037 19,037 — 19,037 — Equity securities 549 549 549 — — Total securities available for sale $ 1,040,386 1,040,386 65,745 974,641 — Investment securities held to maturity: Agency obligations $ 4,306 4,225 4,225 — — Mortgage-backed securities 893 924 — 924 — State and municipal obligations 473,653 474,852 — 474,852 — Corporate obligations 9,331 9,286 — 9,286 — Total securities held to maturity $ 488,183 489,287 4,225 485,062 — FHLBNY stock 75,726 75,726 75,726 — — Loans, net of allowance for loan losses 6,941,603 6,924,440 — — 6,924,440 Derivative assets 7,441 7,441 — 7,441 — Financial liabilities: Deposits other than certificates of deposits $ 5,902,446 5,902,446 5,902,446 — — Certificates of deposit 651,183 653,772 — 653,772 — Total deposits $ 6,553,629 6,556,218 5,902,446 653,772 — Borrowings 1,612,745 1,617,023 — 1,617,023 — Derivative liabilities 6,750 6,750 — 6,750 —

Other Comprehensive Income (L24

Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Sep. 30, 2017
Equity [Abstract]
Components of Other Comprehensive Income (Loss)	The following table presents the components of other comprehensive income (loss), both gross and net of tax, for the three and nine months ended September 30, 2017 and 2016 (in thousands): Three months ended September 30, 2017 2016 Before Tax Tax Effect After Tax Before Tax Tax Effect After Tax Components of Other Comprehensive Income: Unrealized gains and losses on securities available for sale: Net gains (losses) arising during the period $ 799 (320 ) 479 (2,575 ) 1,034 (1,541 ) Reclassification adjustment for gains included in net income — — — 43 (17 ) 26 Total 799 (320 ) 479 (2,532 ) 1,017 (1,515 ) Unrealized gains on derivatives (cash flow hedges) 90 (36 ) 54 384 (154 ) 230 Amortization related to post-retirement obligations 61 (25 ) 36 236 (95 ) 141 Total other comprehensive income (loss) $ 950 (381 ) 569 (1,912 ) 768 (1,144 ) Nine months ended September 30, 2017 2016 Before Tax After Before Tax After Components of Other Comprehensive Income: Unrealized gains and losses on securities available for sale: Net gains arising during the period $ 4,136 (1,658 ) 2,478 14,260 (5,727 ) 8,533 Reclassification adjustment for gains included in net income — — — (54 ) 22 (32 ) Total 4,136 (1,658 ) 2,478 14,206 (5,705 ) 8,501 Unrealized gains (losses) on derivatives (cash flow hedges) 177 (71 ) 106 (603 ) 242 (361 ) Amortization related to post-retirement obligations 183 (78 ) 105 635 (255 ) 380 Total other comprehensive income $ 4,496 (1,807 ) 2,689 14,238 (5,718 ) 8,520
Components of Accumulated Other Comprehensive Income, Net of Tax	The following tables present the changes in the components of accumulated other comprehensive income (loss), net of tax, for the three and nine months ended September 30, 2017 and 2016 (in thousands): Changes in Accumulated Other Comprehensive Income (Loss) by Component, net of tax for the three months ended September 30, 2017 2016 Unrealized Sale Post- Retirement Unrealized gains on Derivatives (cash flow hedges) Accumulated Unrealized for Sale Post- Retirement Unrealized (losses) on Derivatives (cash flow hedges) Accumulated Balance at $ 1,489 (2,987 ) 221 (1,277 ) 13,967 (6,185 ) (664 ) 7,118 Current period other comprehensive income (loss) 479 36 54 569 (1,515 ) 141 230 (1,144 ) Balance at September 30, $ 1,968 (2,951 ) 275 (708 ) 12,452 (6,044 ) (434 ) 5,974 Changes in Accumulated Other Comprehensive Income (Loss) by Component, net of tax for the nine months ended September 30, 2017 2016 Unrealized Sale Post- Retirement Unrealized gains on Derivatives (cash flow hedges) Accumulated Unrealized for Sale Post- Retirement Unrealized (losses) on Derivatives (cash flow hedges) Accumulated Balance at December 31, $ (510 ) (3,056 ) 169 (3,397 ) 3,951 (6,424 ) (73 ) (2,546 ) Current period other comprehensive income (loss) 2,478 105 106 2,689 8,501 380 (361 ) 8,520 Balance at September 30, $ 1,968 (2,951 ) 275 (708 ) 12,452 (6,044 ) (434 ) 5,974
Summary of Reclassifications Out of Accumulated Other Comprehensive Income	The following tables summarize the reclassifications out of accumulated other comprehensive income to the consolidated statements of income for the three and nine months ended September 30, 2017 and 2016 (in thousands): Reclassifications From Accumulated Other Comprehensive Amount reclassified from AOCI for the three months ended September 30, Affected line item in the Consolidated 2017 2016 Details of AOCI: Securities available for sale: Realized net losses on the sale of securities available for sale $ — (43 ) Net gain on securities transactions — 17 Income tax expense — (26 ) Net of tax Post-retirement obligations: Amortization of actuarial losses 61 236 Compensation and employee benefits (1) (25 ) (95 ) Income tax expense 36 141 Net of tax Total reclassifications $ 36 115 Net of tax Reclassifications From Accumulated Other Comprehensive Amount reclassified from AOCI for the nine months ended September 30, Affected line item in the Consolidated 2017 2016 Details of AOCI: Securities available for sale: Realized net gains on the sale of securities available for sale $ — 54 Net gain on securities transactions — (22 ) Income tax expense — 32 Net of tax Post-retirement obligations: Amortization of actuarial losses 183 708 Compensation and employee benefits (1) (78 ) (284 ) Income tax expense 105 424 Net of tax Total reclassifications $ 105 456 Net of tax (1) This item is included in the computation of net periodic benefit cost. See Note 5. Components of Net Periodic Benefit Cost.

Derivatives and Hedging Activ25

Derivatives and Hedging Activities (Tables)	9 Months Ended
	Sep. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Fair Value of Derivative Financial Instruments	The table below presents the fair value of the Company’s derivative financial instruments as well as their classification on the Consolidated Statements of Financial Condition at September 30, 2017 and December 31, 2016 (in thousands): At September 30, 2017 Asset Derivatives Liability Derivatives Consolidated Statements of Financial Condition Fair Value Consolidated Statements of Financial Condition Fair Value Derivatives not designated as a hedging instrument: Interest rate products Other assets $ 7,575 Other liabilities $ 7,595 Credit contracts Other assets 2 Other liabilities — Total derivatives not designated as a hedging instrument $ 7,577 $ 7,595 Derivatives designated as a a hedging instrument: Interest rate products Other assets $ 458 Other liabilities $ — Total derivatives designated as a hedging instrument $ 458 $ — At December 31, 2016 Asset Derivatives Liability Derivatives Consolidated Statements of Financial Condition Fair Value Consolidated Statements of Financial Condition Fair Value Derivatives not designated as a hedging instrument: Interest rate products Other assets $ 7,156 Other liabilities $ 6,750 Credit contracts Other assets 3 Other liabilities — Total derivatives not designated as a hedging instrument $ 7,159 $ 6,750 Derivatives designated as a a hedging instrument: Interest rate products Other assets $ 282 Other liabilities $ — Total derivatives designated as a hedging instrument $ 282 $ —
Effect of the derivative financial instruments on the Income Statement	The tables below present the effect of the Company’s derivative financial instruments on the Consolidated Statements of Income during the three and nine months ended September 30, 2017 and 2016 (in thousands). Gain (loss) recognized in Income on derivatives for the three months ended Consolidated Statements of Income September 30, 2017 September 30, 2016 Derivatives not designated as a hedging instrument: Interest rate products Other income (expense) $ (36 ) $ (95 ) Credit contracts Other income (expense) — 5 Total $ (36 ) $ (90 ) Derivatives designated as a hedging instrument: Interest rate products Other income (expense) $ (59 ) $ (129 ) Total $ (59 ) $ (129 ) Gain (loss) recognized in Income on derivatives for the nine months ended Consolidated Statements of Income September 30, 2017 September 30, 2016 Derivatives not designated as a hedging instrument: Interest rate products Other income (expense) $ (428 ) $ (1,060 ) Credit contracts Other income (expense) 1 103 Total $ (427 ) $ (957 ) Derivatives designated as a hedging instrument: Interest rate products Other income (expense) $ (166 ) $ (366 ) Total $ (166 ) $ (366 )

Summary of Significant Accoun26

Summary of Significant Accounting Policies (Narrative) (Detail) - shares	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Accounting Policies [Abstract]
Anti-dilutive stock options and awards excluded from computation of earnings per share	405,958	528,205

Summary of Significant Accoun27

Summary of Significant Accounting Policies (Earnings Per Share) (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accounting Policies [Abstract]
Net income	$ 26,575	$ 22,906	$ 74,466	$ 65,235
Basic earnings per share:
Income available to common stockholders, basic	$ 26,575	$ 22,906	$ 74,466	$ 65,235
Weighted average common shares outstanding, basic (in shares)	64,454,684	63,728,393	64,327,640	63,545,065
Income available to common stockholders, per share amount, basic (usd per share)	$ 0.41	$ 0.36	$ 1.16	$ 1.03
Diluted earnings per share:
Income available to common stockholders, diluted	$ 26,575	$ 22,906	$ 74,466	$ 65,235
Dilutive shares (in shares)	190,594	206,493	192,070	182,658
Weighted average common shares outstanding, diluted (in shares)	64,645,278	63,934,886	64,519,710	63,727,723
Income available to common stockholders, per share amount, diluted (usd per share)	$ 0.41	$ 0.36	$ 1.15	$ 1.02

Investment Securities (Narrativ

Investment Securities (Narrative) (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2017USD ($)securityposition	Sep. 30, 2016USD ($)	Sep. 30, 2017USD ($)securityposition	Sep. 30, 2016USD ($)	Dec. 31, 2016USD ($)securityposition
Schedule of Held-to-maturity Securities [Line Items]
Securities available for sale, at fair value	$ 1,028,305,000		$ 1,028,305,000		$ 1,040,386,000
Investment securities held to maturity	$ 481,845,000		$ 481,845,000		$ 488,183,000
Total number of all held to maturity and available for sale securities in an unrealized loss position | security	253		253		419
Amortized cost	$ 1,025,030,000		$ 1,025,030,000		$ 1,041,247,000
Proceeds from the sale of securities available for sale	$ 0	$ 1,200,000	$ 0
Gross gains		0		$ 95,000
Gross losses		45,000		45,000
Proceeds from maturities, prepayments and calls of short-term investments				3,400,000
Proceeds from calls on securities available for sale		0		0
Number of securities in an unrealized loss position | position	82		82		87
Other-than-temporary impairment charges, net	$ 0		$ 0
Proceeds from calls of held to maturity securities	8,100,000	20,300,000	28,700,000	35,200,000
Recognized gain on calls of securities, held-to-maturity portfolio	39,000	2,000	50,000	4,000
Recognized loss on calls of securities held-to-maturity portfolio	3,000	$ 0	3,000	$ 0
Investment securities held to maturity, fair value	$ 490,425,000		$ 490,425,000		$ 489,287,000
Number of securities in an unrealized loss position | security	171		171		332
Private Label Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	$ 50,000		$ 50,000
Number of securities in an unrealized loss position | position	2		2
Unrealized losses			$ 2,000
Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities available for sale, at fair value	$ 968,412,000		968,412,000		$ 951,861,000
Investment securities held to maturity	475,000		475,000		893,000
Amortized cost	965,863,000		965,863,000		952,992,000
Held-to-maturity securities, amortized cost	475,000		475,000
Investment securities held to maturity, fair value	492,000		492,000		924,000
Equity Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities available for sale, at fair value	598,000		598,000		549,000
Amortized cost	$ 397,000		$ 397,000		$ 397,000

Investment Securities (Securiti

Investment Securities (Securities Available for Sale) (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 1,025,030	$ 1,041,247
Gross unrealized gains	8,225	7,558
Gross unrealized losses	(4,950)	(8,419)
Fair value	1,028,305	1,040,386
U.S. Treasury Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	5,995	7,995
Gross unrealized gains	0	13
Gross unrealized losses	(1)	0
Fair value	5,994	8,008
Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	28,031	57,123
Gross unrealized gains	15	90
Gross unrealized losses	(11)	(25)
Fair value	28,035	57,188
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	965,863	952,992
Gross unrealized gains	7,477	7,249
Gross unrealized losses	(4,928)	(8,380)
Fair value	968,412	951,861
State And Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	3,695	3,727
Gross unrealized gains	112	19
Gross unrealized losses	0	(3)
Fair value	3,807	3,743
Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	21,049	19,013
Gross unrealized gains	420	35
Gross unrealized losses	(10)	(11)
Fair value	21,459	19,037
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	397	397
Gross unrealized gains	201	152
Gross unrealized losses	0	0
Fair value	$ 598	$ 549

Investment Securities (Availabl

Investment Securities (Available for Sale by Contractual Maturity) (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 1,025,030	$ 1,041,247
Securities available for sale, at fair value	1,028,305	$ 1,040,386
Available-for-sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Due in one year or less, amortized cost	35,452
Due after one year through five years, amortized cost	2,423
Due after five years through ten years, amortized cost	20,895
Due after ten years, amortized cost	0
Amortized cost	58,770
Due in one year or less, fair value	35,445
Due after one year through five years, fair value	2,471
Due after five years through ten years, fair value	21,379
Due after ten years , fair value	0
Securities available for sale, at fair value	$ 59,295

Investment Securities (Disclosu

Investment Securities (Disclosure Regarding Length of Time on Securities Available for Sale with Temporary Impairment) (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	$ 446,629	$ 568,290
Less than 12 months, gross unrealized losses	(3,968)	(8,405)
12 months or longer, fair value	51,872	1,055
12 months or longer, gross unrealized losses	(982)	(14)
Total, fair value	498,501	569,345
Total, gross unrealized losses	(4,950)	(8,419)
U.S. Treasury Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	5,994
Less than 12 months, gross unrealized losses	(1)
12 months or longer, fair value	0
12 months or longer, gross unrealized losses	0
Total, fair value	5,994
Total, gross unrealized losses	(1)	0
Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	16,008	14,000
Less than 12 months, gross unrealized losses	(11)	(25)
12 months or longer, fair value	0	0
12 months or longer, gross unrealized losses	0	0
Total, fair value	16,008	14,000
Total, gross unrealized losses	(11)	(25)
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	424,627	553,629
Less than 12 months, gross unrealized losses	(3,956)	(8,377)
12 months or longer, fair value	50,881	65
12 months or longer, gross unrealized losses	(972)	(3)
Total, fair value	475,508	553,694
Total, gross unrealized losses	(4,928)	(8,380)
State and municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value		661
Less than 12 months, gross unrealized losses		(3)
12 months or longer, fair value		0
12 months or longer, gross unrealized losses		0
Total, fair value		661
Total, gross unrealized losses		(3)
Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	0	0
Less than 12 months, gross unrealized losses	0	0
12 months or longer, fair value	991	990
12 months or longer, gross unrealized losses	(10)	(11)
Total, fair value	991	990
Total, gross unrealized losses	$ (10)	$ (11)

Investment Securities (Held to

Investment Securities (Held to Maturity) (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	$ 481,845	$ 488,183
Gross unrealized gains	10,430	6,675
Gross unrealized losses	(1,850)	(5,571)
Fair value	490,425	489,287
Agency Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	4,307	4,306
Gross unrealized gains	0	2
Gross unrealized losses	(55)	(83)
Fair value	4,252	4,225
Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	475	893
Gross unrealized gains	17	31
Gross unrealized losses	0	0
Fair value	492	924
State And Municipal Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	467,113	473,653
Gross unrealized gains	10,407	6,635
Gross unrealized losses	(1,761)	(5,436)
Fair value	475,759	474,852
Corporate Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	9,950	9,331
Gross unrealized gains	6	7
Gross unrealized losses	(34)	(52)
Fair value	$ 9,922	$ 9,286

Investment Securities (Securi33

Investment Securities (Securities Held to Maturity by Contractual Maturity) (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	$ 481,845	$ 488,183
Fair value	490,425	$ 489,287
Held-to-maturity Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Due in one year or less, amortized cost	14,723
Due after one year through five years, amortized cost	65,170
Due after five years through ten years, amortized cost	254,191
Due after ten years, amortized cost	147,286
Amortized cost	481,370
Due in one year or less, fair value	14,755
Due after one year through five years, fair value	66,276
Due after five years through ten years, fair value	259,908
Due after ten years, fair value	148,994
Fair value	$ 489,933

Investment Securities (Disclo34

Investment Securities (Disclosure Regarding Length of Time on Investment Securities with Temporary Impairment) (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, fair value	$ 73,380	$ 180,374
Less than 12 months, gross unrealized losses	(1,027)	(5,267)
12 months or longer, fair value	22,251	6,617
12 months or longer, gross unrealized losses	(823)	(304)
Total, fair value	95,631	186,991
Total, gross unrealized losses	(1,850)	(5,571)
Agency Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, fair value	3,853	3,525
Less than 12 months, gross unrealized losses	(55)	(83)
12 months or longer, fair value	0	0
12 months or longer, gross unrealized losses	0	0
Total, fair value	3,853	3,525
Total, gross unrealized losses	(55)	(83)
State And Municipal Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, fair value	62,881	172,152
Less than 12 months, gross unrealized losses	(938)	(5,132)
12 months or longer, fair value	22,251	6,617
12 months or longer, gross unrealized losses	(823)	(304)
Total, fair value	85,132	178,769
Total, gross unrealized losses	(1,761)	(5,436)
Corporate Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, fair value	6,646	4,697
Less than 12 months, gross unrealized losses	(34)	(52)
12 months or longer, fair value	0	0
12 months or longer, gross unrealized losses	0	0
Total, fair value	6,646	4,697
Total, gross unrealized losses	$ (34)	$ (52)

Loans Receivable and Allowanc35

Loans Receivable and Allowance for Loan Losses (Narrative) (Detail)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017USD ($)Contract	Sep. 30, 2016USD ($)	Sep. 30, 2017USD ($)SecurityLoanborrowertroubled_debt_restructuringContract	Sep. 30, 2016USD ($)	Sep. 30, 2017USD ($)SecurityLoanContract	Dec. 31, 2016USD ($)SecurityLoanborrowertroubled_debt_restructuringContract	May 30, 2014USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Principal amount of nonaccrual loans	$ 36,400,000		$ 36,400,000		$ 36,400,000	$ 42,400,000
Loans less than 90 days past due	$ 9,100,000		$ 9,100,000		$ 9,100,000	$ 7,300,000
Number of loans 90 days past due and still accruing | Contract	0		0		0	0
Impaired loan defined floor limit (greater than)	$ 1,000,000		$ 1,000,000		$ 1,000,000
Impaired loans number | SecurityLoan			145			141
Impaired loans	50,181,000		$ 50,181,000		50,181,000	$ 52,019,000
Number of troubled debt restructurings | troubled_debt_restructuring			126			114
Number of borrowers | borrower			122			110
Loans and leases receivable, impaired, nonperforming, accrual of interest	31,700,000		$ 31,700,000		$ 31,700,000	$ 29,900,000
Charge off, impaired loan	$ 3,200,000	$ 0	$ 4,400,000	$ 0
Weighted average modified interest rate	4.36%		4.02%
Weighted average prior modification rate	4.33%		3.93%
Number of payment defaults for loans modified as TDRs | SecurityLoan					0
Allowances for loan losses	$ 2,872,000		$ 2,872,000		$ 2,872,000	2,334,000
Impaired financing receivable with no related allowance	29,700,000		29,700,000		29,700,000	31,800,000
Average balance of impaired loans			51,198,000			52,002,000
Team Capital Bank [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of acquired loans							$ 5,200,000
Balance of PCI loans	1,000,000		1,000,000		$ 1,000,000	$ 1,300,000
Impaired Loans Troubled Debt Restructurings [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Allowances for loan losses	$ 0		$ 120,000

Loans Receivable and Allowanc36

Loans Receivable and Allowance for Loan Losses (Schedule of Summarized Loans Receivable) (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	$ 7,029,667	$ 7,004,308
Premiums on purchased loans	4,229	4,968
Unearned discounts	(36)	(39)
Net deferred fees	(6,799)	(7,023)
Total loans	7,028,052	7,003,486
Purchased credit-impaired (PCI) loans [Member]
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	991	1,272
Mortgage Portfolio Segment [Member]
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	4,839,563	4,857,109
Mortgage Portfolio Segment [Member] | Residential [Member]
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	1,157,311	1,211,672
Mortgage Portfolio Segment [Member] | Commercial [Member]
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	2,022,576	1,978,569
Mortgage Portfolio Segment [Member] | Multi-Family [Member]
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	1,334,984	1,402,054
Mortgage Portfolio Segment [Member] | Construction [Member]
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	324,692	264,814
Commercial Loans [Member]
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	1,708,842	1,630,444
Consumer Loans [Member]
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	$ 481,262	$ 516,755

Loans Receivable and Allowanc37

Loans Receivable and Allowance for Loan Losses (Summary of Aging Loans Receivable by Portfolio Segment and Class) (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	$ 36,448	$ 42,401
Recorded Investment greater than 90 days accruing	0	0
Total Past Due	52,347	60,708
Current	6,977,320	6,943,600
Total gross loans	7,029,667	7,004,308
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	10,758	10,108
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	5,141	8,199
Mortgage Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	16,890	22,584
Recorded Investment greater than 90 days accruing	0	0
Total Past Due	27,288	35,118
Current	4,812,275	4,821,991
Total gross loans	4,839,563	4,857,109
Mortgage Portfolio Segment [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	8,820	12,021
Recorded Investment greater than 90 days accruing	0	0
Total Past Due	18,318	24,475
Current	1,138,993	1,187,197
Total gross loans	1,157,311	1,211,672
Mortgage Portfolio Segment [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	8,070	7,493
Recorded Investment greater than 90 days accruing	0	0
Total Past Due	8,970	7,573
Current	2,013,606	1,970,996
Total gross loans	2,022,576	1,978,569
Mortgage Portfolio Segment [Member] | Multi-Family [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	0	553
Recorded Investment greater than 90 days accruing	0	0
Total Past Due	0	553
Current	1,334,984	1,401,501
Total gross loans	1,334,984	1,402,054
Mortgage Portfolio Segment [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	0	2,517
Recorded Investment greater than 90 days accruing	0	0
Total Past Due	0	2,517
Current	324,692	262,297
Total gross loans	324,692	264,814
Mortgage Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	6,581	5,891
Mortgage Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	5,973	5,891
Mortgage Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	608	0
Mortgage Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Multi-Family [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	0	0
Mortgage Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	0	0
Mortgage Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	3,817	6,643
Mortgage Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	3,525	6,563
Mortgage Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	292	80
Mortgage Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Multi-Family [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	0	0
Mortgage Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	0	0
Commercial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	17,523	16,787
Recorded Investment greater than 90 days accruing	0	0
Total Past Due	19,637	18,800
Current	1,689,205	1,611,644
Total gross loans	1,708,842	1,630,444
Commercial Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	1,870	1,656
Commercial Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	244	357
Consumer Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	2,035	3,030
Recorded Investment greater than 90 days accruing	0	0
Total Past Due	5,422	6,790
Current	475,840	509,965
Total gross loans	481,262	516,755
Consumer Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	2,307	2,561
Consumer Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment past due	$ 1,080	$ 1,199

Loans Receivable and Allowanc38

Loans Receivable and Allowance for Loan Losses (Summary of Loans Receivable by Portfolio Segment and Impairment Method) (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	$ 50,181	$ 52,019
Collectively evaluated for impairment	6,979,486	6,952,289
Total gross loans	7,029,667	7,004,308
Mortgage Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	28,578	29,551
Collectively evaluated for impairment	4,810,985	4,827,558
Total gross loans	4,839,563	4,857,109
Commercial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	19,393	20,255
Collectively evaluated for impairment	1,689,449	1,610,189
Total gross loans	1,708,842	1,630,444
Consumer Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	2,210	2,213
Collectively evaluated for impairment	479,052	514,542
Total gross loans	$ 481,262	$ 516,755

Loans Receivable and Allowanc39

Loans Receivable and Allowance for Loan Losses (Summary of Allowance for Loan Losses by Portfolio Segment and Impairment Classification) (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	$ 2,872		$ 2,334
Collectively evaluated for impairment	57,404		59,549
Total	60,276	$ 62,862	61,883	$ 61,088	$ 60,933	$ 61,424
Mortgage Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	1,773		1,986
Collectively evaluated for impairment	24,724		27,640
Total	26,497	28,826	29,626	29,654	31,634	32,094
Consumer Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	71		80
Collectively evaluated for impairment	2,257		3,034
Total	2,328	2,951	3,114	3,195	3,000	3,501
Commercial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	1,028		268
Collectively evaluated for impairment	30,423		28,875
Total	31,451	31,085	29,143	28,239	26,299	25,829
Total Portfolio Segments [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	60,276	62,862	61,883	61,088	60,933	61,424
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0

Loans Receivable and Allowanc40

Loans Receivable and Allowance for Loan Losses (Schedule of Troubled Debt Restructurings) (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017USD ($)SecurityLoan	Sep. 30, 2016USD ($)SecurityLoan	Sep. 30, 2017USD ($)SecurityLoan	Sep. 30, 2016USD ($)SecurityLoan
Financing Receivable, Recorded Investment [Line Items]
Number of Loans | SecurityLoan	2	0	9	0
Pre-Modification Outstanding Recorded Investment	$ 632	$ 0	$ 4,806	$ 0
Post-Modification Outstanding Recorded Investment	$ 470	$ 0	$ 4,480	$ 0
Mortgage Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans | SecurityLoan	2	0	7	0
Pre-Modification Outstanding Recorded Investment	$ 632	$ 0	$ 3,436	$ 0
Post-Modification Outstanding Recorded Investment	$ 470	$ 0	$ 3,202	$ 0
Mortgage Portfolio Segment [Member] | Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans | SecurityLoan	2	0	7	0
Pre-Modification Outstanding Recorded Investment	$ 632	$ 0	$ 3,436	$ 0
Post-Modification Outstanding Recorded Investment	$ 470	$ 0	$ 3,202	$ 0
Commercial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans | SecurityLoan			1	0
Pre-Modification Outstanding Recorded Investment			$ 1,300	$ 0
Post-Modification Outstanding Recorded Investment			$ 1,210	$ 0
Consumer Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans | SecurityLoan			1	0
Pre-Modification Outstanding Recorded Investment			$ 70	$ 0
Post-Modification Outstanding Recorded Investment			$ 68	$ 0

Loans Receivable and Allowanc41

Loans Receivable and Allowance for Loan Losses (Change in Accretable Yield) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Beginning balance	$ 158	$ 328	$ 200	$ 676
Accretion	(154)	(225)	(299)	(1,065)
Reclassification from non-accretable discount	99	209	202	701
Ending balance	$ 103	$ 312	$ 103	$ 312

Loans Receivable and Allowanc42

Loans Receivable and Allowance for Loan Losses (Schedule of Allowance for Loan Losses by Portfolio Segment) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	$ 62,862	$ 60,933	$ 61,883	$ 61,424
Provision charged (credited) to operations	500	1,000	3,700	4,200
Recoveries of loans previously charged-off	435	230	1,428	1,623
Loans charged-off	(3,521)	(1,075)	(6,735)	(6,159)
Balance at end of period	60,276	61,088	60,276	61,088
Mortgage Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	28,826	31,634	29,626	32,094
Provision charged (credited) to operations	(2,301)	(1,599)	(2,724)	(2,294)
Recoveries of loans previously charged-off	4	2	65	575
Loans charged-off	(32)	(383)	(470)	(721)
Balance at end of period	26,497	29,654	26,497	29,654
Commercial Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	31,085	26,299	29,143	25,829
Provision charged (credited) to operations	3,446	2,378	6,840	6,647
Recoveries of loans previously charged-off	140	68	671	351
Loans charged-off	(3,220)	(506)	(5,203)	(4,588)
Balance at end of period	31,451	28,239	31,451	28,239
Consumer Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	2,951	3,000	3,114	3,501
Provision charged (credited) to operations	(645)	221	(416)	(153)
Recoveries of loans previously charged-off	291	160	692	697
Loans charged-off	(269)	(186)	(1,062)	(850)
Balance at end of period	2,328	3,195	2,328	3,195
Total Portfolio Segments [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	62,862	60,933	61,883	61,424
Provision charged (credited) to operations	500	1,000	3,700	4,200
Recoveries of loans previously charged-off	435	230	1,428	1,623
Loans charged-off	(3,521)	(1,075)	(6,735)	(6,159)
Balance at end of period	60,276	61,088	60,276	61,088
Unallocated [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	0	0	0	0
Provision charged (credited) to operations	0	0	0	0
Recoveries of loans previously charged-off	0	0	0	0
Loans charged-off	0	0	0	0
Balance at end of period	$ 0	$ 0	$ 0	$ 0

Loans Receivable and Allowanc43

Loans Receivable and Allowance for Loan Losses (Summary of Impaired Loans Receivable by Class) (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance	$ 36,746	$ 38,123
Loans with no related allowance, Recorded Investment	29,700	31,809
Loans with no related allowance, Average Recorded Investment	30,027	26,971
Loans with no related allowance, Interest Income Recognized	671	842
Loans with an allowance recorded
Loans with an allowance recorded, Unpaid Principal Balance	22,186	20,930
Loans with an allowance recorded, Recorded Investment	20,481	20,210
Loans with an allowance recorded, Average Recorded Investment	21,171	25,031
Loans with an allowance recorded, Interest Income Recognized	513	644
Total impaired loans
Unpaid Principal Balance	58,932	59,053
Recorded Investment	50,181	52,019
Related Allowance	2,872	2,334
Average Recorded Investment	51,198	52,002
Interest Income Recognized	1,184	1,486
Mortgage Portfolio Segment [Member]
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance	17,635	14,800
Loans with no related allowance, Recorded Investment	14,749	11,954
Loans with no related allowance, Average Recorded Investment	14,887	12,127
Loans with no related allowance, Interest Income Recognized	340	524
Loans with an allowance recorded
Loans with an allowance recorded, Unpaid Principal Balance	14,874	18,307
Loans with an allowance recorded, Recorded Investment	13,829	17,597
Loans with an allowance recorded, Average Recorded Investment	13,956	17,816
Loans with an allowance recorded, Interest Income Recognized	414	574
Total impaired loans
Unpaid Principal Balance	32,509	33,107
Recorded Investment	28,578	29,551
Related Allowance	1,773	1,986
Average Recorded Investment	28,843	29,943
Interest Income Recognized	754	1,098
Mortgage Portfolio Segment [Member] | Residential [Member]
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance	13,035	10,691
Loans with no related allowance, Recorded Investment	10,277	7,881
Loans with no related allowance, Average Recorded Investment	10,391	8,027
Loans with no related allowance, Interest Income Recognized	340	484
Loans with an allowance recorded
Loans with an allowance recorded, Unpaid Principal Balance	13,803	14,169
Loans with an allowance recorded, Recorded Investment	12,759	13,520
Loans with an allowance recorded, Average Recorded Investment	12,873	13,705
Loans with an allowance recorded, Interest Income Recognized	374	519
Total impaired loans
Unpaid Principal Balance	26,838	24,860
Recorded Investment	23,036	21,401
Related Allowance	1,633	1,716
Average Recorded Investment	23,264	21,732
Interest Income Recognized	714	1,003
Mortgage Portfolio Segment [Member] | Commercial [Member]
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance	4,600	1,556
Loans with no related allowance, Recorded Investment	4,472	1,556
Loans with no related allowance, Average Recorded Investment	4,496	1,586
Loans with no related allowance, Interest Income Recognized	0	40
Loans with an allowance recorded
Loans with an allowance recorded, Unpaid Principal Balance	1,071	4,138
Loans with an allowance recorded, Recorded Investment	1,070	4,077
Loans with an allowance recorded, Average Recorded Investment	1,083	4,111
Loans with an allowance recorded, Interest Income Recognized	40	55
Total impaired loans
Unpaid Principal Balance	5,671	5,694
Recorded Investment	5,542	5,633
Related Allowance	140	270
Average Recorded Investment	5,579	5,697
Interest Income Recognized	40	95
Mortgage Portfolio Segment [Member] | Construction [Member]
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance	0	2,553
Loans with no related allowance, Recorded Investment	0	2,517
Loans with no related allowance, Average Recorded Investment	0	2,514
Loans with no related allowance, Interest Income Recognized	0	0
Loans with an allowance recorded
Loans with an allowance recorded, Unpaid Principal Balance	0	0
Loans with an allowance recorded, Recorded Investment	0	0
Loans with an allowance recorded, Average Recorded Investment	0	0
Loans with an allowance recorded, Interest Income Recognized	0	0
Total impaired loans
Unpaid Principal Balance	0	2,553
Recorded Investment	0	2,517
Related Allowance	0	0
Average Recorded Investment	0	2,514
Interest Income Recognized	0	0
Commercial Loans [Member]
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance	17,505	21,830
Loans with no related allowance, Recorded Investment	13,884	18,874
Loans with no related allowance, Average Recorded Investment	13,954	13,818
Loans with no related allowance, Interest Income Recognized	280	259
Loans with an allowance recorded
Loans with an allowance recorded, Unpaid Principal Balance	6,158	1,381
Loans with an allowance recorded, Recorded Investment	5,509	1,381
Loans with an allowance recorded, Average Recorded Investment	6,045	5,956
Loans with an allowance recorded, Interest Income Recognized	52	4
Total impaired loans
Unpaid Principal Balance	23,663	23,211
Recorded Investment	19,393	20,255
Related Allowance	1,028	268
Average Recorded Investment	19,999	19,774
Interest Income Recognized	332	263
Consumer Loans [Member]
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance	1,606	1,493
Loans with no related allowance, Recorded Investment	1,067	981
Loans with no related allowance, Average Recorded Investment	1,186	1,026
Loans with no related allowance, Interest Income Recognized	51	59
Loans with an allowance recorded
Loans with an allowance recorded, Unpaid Principal Balance	1,154	1,242
Loans with an allowance recorded, Recorded Investment	1,143	1,232
Loans with an allowance recorded, Average Recorded Investment	1,170	1,259
Loans with an allowance recorded, Interest Income Recognized	47	66
Total impaired loans
Unpaid Principal Balance	2,760	2,735
Recorded Investment	2,210	2,213
Related Allowance	71	80
Average Recorded Investment	2,356	2,285
Interest Income Recognized	$ 98	$ 125

Loans Receivable and Allowanc44

Loans Receivable and Allowance for Loan Losses (Summary of Loans Receivable by Credit Quality Risk Rating Indicator) (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	$ 7,029,667	$ 7,004,308
Total classified and criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	117,833	136,834
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	50,214	48,537
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	66,848	88,297
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	771	0
Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	0	0
Pass/Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	6,911,834	6,867,474
Mortgage Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	4,839,563	4,857,109
Mortgage Portfolio Segment [Member] | Total classified and criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	57,431	70,557
Mortgage Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	22,978	32,455
Mortgage Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	34,453	38,102
Mortgage Portfolio Segment [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	0	0
Mortgage Portfolio Segment [Member] | Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	0	0
Mortgage Portfolio Segment [Member] | Pass/Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	4,782,132	4,786,552
Mortgage Portfolio Segment [Member] | Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	1,157,311	1,211,672
Mortgage Portfolio Segment [Member] | Residential [Member] | Total classified and criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	12,345	18,584
Mortgage Portfolio Segment [Member] | Residential [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	3,525	6,563
Mortgage Portfolio Segment [Member] | Residential [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	8,820	12,021
Mortgage Portfolio Segment [Member] | Residential [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	0	0
Mortgage Portfolio Segment [Member] | Residential [Member] | Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	0	0
Mortgage Portfolio Segment [Member] | Residential [Member] | Pass/Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	1,144,966	1,193,088
Mortgage Portfolio Segment [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	2,022,576	1,978,569
Mortgage Portfolio Segment [Member] | Commercial [Member] | Total classified and criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	45,070	48,340
Mortgage Portfolio Segment [Member] | Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	19,437	25,329
Mortgage Portfolio Segment [Member] | Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	25,633	23,011
Mortgage Portfolio Segment [Member] | Commercial [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	0	0
Mortgage Portfolio Segment [Member] | Commercial [Member] | Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	0	0
Mortgage Portfolio Segment [Member] | Commercial [Member] | Pass/Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	1,977,506	1,930,229
Mortgage Portfolio Segment [Member] | Multi-Family [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	1,334,984	1,402,054
Mortgage Portfolio Segment [Member] | Multi-Family [Member] | Total classified and criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	16	1,116
Mortgage Portfolio Segment [Member] | Multi-Family [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	16	563
Mortgage Portfolio Segment [Member] | Multi-Family [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	0	553
Mortgage Portfolio Segment [Member] | Multi-Family [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	0	0
Mortgage Portfolio Segment [Member] | Multi-Family [Member] | Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	0	0
Mortgage Portfolio Segment [Member] | Multi-Family [Member] | Pass/Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	1,334,968	1,400,938
Mortgage Portfolio Segment [Member] | Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	324,692	264,814
Mortgage Portfolio Segment [Member] | Construction [Member] | Total classified and criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	0	2,517
Mortgage Portfolio Segment [Member] | Construction [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	0	0
Mortgage Portfolio Segment [Member] | Construction [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	0	2,517
Mortgage Portfolio Segment [Member] | Construction [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	0	0
Mortgage Portfolio Segment [Member] | Construction [Member] | Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	0	0
Mortgage Portfolio Segment [Member] | Construction [Member] | Pass/Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	324,692	262,297
Commercial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	1,708,842	1,630,444
Commercial Loans [Member] | Total classified and criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	57,288	62,095
Commercial Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	26,156	14,840
Commercial Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	30,361	47,255
Commercial Loans [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	771	0
Commercial Loans [Member] | Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	0	0
Commercial Loans [Member] | Pass/Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	1,651,554	1,568,349
Consumer Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	481,262	516,755
Consumer Loans [Member] | Total classified and criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	3,114	4,182
Consumer Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	1,080	1,242
Consumer Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	2,034	2,940
Consumer Loans [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	0	0
Consumer Loans [Member] | Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	0	0
Consumer Loans [Member] | Pass/Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	$ 478,148	$ 512,573

Deposits (Detail)

Deposits (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Banking and Thrift [Abstract]
Savings	$ 1,083,215	$ 1,099,020
Money market	1,539,064	1,582,750
NOW	1,972,220	1,871,298
Non-interest bearing	1,368,849	1,349,378
Certificates of deposit	627,868	651,183
Total deposits	$ 6,591,216	$ 6,553,629

Components of Net Periodic Be46

Components of Net Periodic Benefit Cost (Narrative) (Detail) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2006	Dec. 31, 2002
Retirement Benefits [Abstract]
Service period for employees of coverage age, years (at least)	1 year
Defined benefit plan, percentage vested	100.00%
Retiree benefits eliminated if less than service period, years (less than)		10 years	10 years
Defined benefit plan, contributions by employer	$ 0

Components of Net Periodic Be47

Components of Net Periodic Benefit Cost (Benefit Cost (Increase)) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Pension benefits [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	306	312	920	936
Expected return on plan assets	(637)	(612)	(1,913)	(1,836)
Amortization of prior service cost	0	0	0	0
Amortization of the net loss	230	236	690	708
Net periodic (increase) benefit cost	(101)	(64)	(303)	(192)
Other post-retirement benefits [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Service cost	26	37	78	112
Interest cost	218	285	654	854
Expected return on plan assets	0	0	0	0
Amortization of prior service cost	0	0	0	0
Amortization of the net loss	(169)	0	(507)	0
Net periodic (increase) benefit cost	$ 75	$ 322	$ 225	$ 966

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Detail)	9 Months Ended
	Sep. 30, 2017
Minimum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated selling costs	5.00%
Maximum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated selling costs	10.00%

Fair Value Measurements (Assets

Fair Value Measurements (Assets and Liabilities) (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Securities available for sale:
Securities available for sale, at fair value	$ 1,028,305	$ 1,040,386
Derivative liabilities	2,500
Measured on a non-recurring basis:
Foreclosed assets	5,703	7,991
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Securities available for sale:
Securities available for sale, at fair value	34,627	65,745
Derivative assets	0	0
Derivative liabilities	0	0
Significant Other Observable Inputs (Level 2) [Member]
Securities available for sale:
Securities available for sale, at fair value	993,678	974,641
Derivative assets	8,035	7,441
Derivative liabilities	7,595	6,750
Significant Unobservable Inputs (Level 3) [Member]
Securities available for sale:
Securities available for sale, at fair value	0	0
Derivative assets	0	0
Derivative liabilities	0	0
U.S. Treasury Obligations [Member]
Securities available for sale:
Securities available for sale, at fair value	5,994	8,008
U.S. Treasury Obligations [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Securities available for sale:
Securities available for sale, at fair value	5,994	8,008
U.S. Treasury Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member]
Securities available for sale:
Securities available for sale, at fair value	0	0
U.S. Treasury Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member]
Securities available for sale:
Securities available for sale, at fair value	0	0
Agency Obligations [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Securities available for sale:
Securities available for sale, at fair value	28,035	57,188
Agency Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member]
Securities available for sale:
Securities available for sale, at fair value	0	0
Agency Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member]
Securities available for sale:
Securities available for sale, at fair value	0	0
Mortgage-Backed Securities [Member]
Securities available for sale:
Securities available for sale, at fair value	968,412	951,861
Mortgage-Backed Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Securities available for sale:
Securities available for sale, at fair value	0	0
Mortgage-Backed Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Securities available for sale:
Securities available for sale, at fair value	968,412	951,861
Mortgage-Backed Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Securities available for sale:
Securities available for sale, at fair value	0	0
State And Municipal Obligations [Member]
Securities available for sale:
Securities available for sale, at fair value	3,807	3,743
State And Municipal Obligations [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Securities available for sale:
Securities available for sale, at fair value	0	0
State And Municipal Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member]
Securities available for sale:
Securities available for sale, at fair value	3,807	3,743
State And Municipal Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member]
Securities available for sale:
Securities available for sale, at fair value	0	0
Corporate Obligations [Member]
Securities available for sale:
Securities available for sale, at fair value	21,459	19,037
Corporate Obligations [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Securities available for sale:
Securities available for sale, at fair value	0	0
Corporate Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member]
Securities available for sale:
Securities available for sale, at fair value	21,459	19,037
Corporate Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member]
Securities available for sale:
Securities available for sale, at fair value	0	0
Equity Securities [Member]
Securities available for sale:
Securities available for sale, at fair value	598	549
Equity Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Securities available for sale:
Securities available for sale, at fair value	598	549
Equity Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Securities available for sale:
Securities available for sale, at fair value	0	0
Equity Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Securities available for sale:
Securities available for sale, at fair value	0	0
Measured on a Recurring Basis [Member]
Securities available for sale:
Securities available for sale, at fair value	1,028,305	1,040,386
Derivative assets	8,035	7,441
Total assets at fair value	1,036,340	1,047,827
Derivative liabilities	7,595	6,750
Measured on a Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Securities available for sale:
Securities available for sale, at fair value	34,627	65,745
Derivative assets	0	0
Total assets at fair value	34,627	65,745
Derivative liabilities	0	0
Measured on a Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member]
Securities available for sale:
Securities available for sale, at fair value	993,678	974,641
Derivative assets	8,035	7,441
Total assets at fair value	1,001,713	982,082
Derivative liabilities	7,595	6,750
Measured on a Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member]
Securities available for sale:
Securities available for sale, at fair value	0	0
Derivative assets	0	0
Total assets at fair value	0	0
Derivative liabilities	0	0
Measured on a Recurring Basis [Member] | U.S. Treasury Obligations [Member]
Securities available for sale:
Securities available for sale, at fair value	5,994	8,008
Measured on a Recurring Basis [Member] | U.S. Treasury Obligations [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Securities available for sale:
Securities available for sale, at fair value	5,994	8,008
Measured on a Recurring Basis [Member] | U.S. Treasury Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member]
Securities available for sale:
Securities available for sale, at fair value	0	0
Measured on a Recurring Basis [Member] | U.S. Treasury Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member]
Securities available for sale:
Securities available for sale, at fair value	0	0
Measured on a Recurring Basis [Member] | Agency Obligations [Member]
Securities available for sale:
Securities available for sale, at fair value	28,035	57,188
Measured on a Recurring Basis [Member] | Agency Obligations [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Securities available for sale:
Securities available for sale, at fair value	28,035	57,188
Measured on a Recurring Basis [Member] | Agency Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member]
Securities available for sale:
Securities available for sale, at fair value	0	0
Measured on a Recurring Basis [Member] | Agency Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member]
Securities available for sale:
Securities available for sale, at fair value	0	0
Measured on a Recurring Basis [Member] | Mortgage-Backed Securities [Member]
Securities available for sale:
Securities available for sale, at fair value	968,412	951,861
Measured on a Recurring Basis [Member] | Mortgage-Backed Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Securities available for sale:
Securities available for sale, at fair value	0	0
Measured on a Recurring Basis [Member] | Mortgage-Backed Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Securities available for sale:
Securities available for sale, at fair value	968,412	951,861
Measured on a Recurring Basis [Member] | Mortgage-Backed Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Securities available for sale:
Securities available for sale, at fair value	0	0
Measured on a Recurring Basis [Member] | State And Municipal Obligations [Member]
Securities available for sale:
Securities available for sale, at fair value	3,807	3,743
Measured on a Recurring Basis [Member] | State And Municipal Obligations [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Securities available for sale:
Securities available for sale, at fair value	0	0
Measured on a Recurring Basis [Member] | State And Municipal Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member]
Securities available for sale:
Securities available for sale, at fair value	3,807	3,743
Measured on a Recurring Basis [Member] | State And Municipal Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member]
Securities available for sale:
Securities available for sale, at fair value	0	0
Measured on a Recurring Basis [Member] | Corporate Obligations [Member]
Securities available for sale:
Securities available for sale, at fair value	21,459	19,037
Measured on a Recurring Basis [Member] | Corporate Obligations [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Securities available for sale:
Securities available for sale, at fair value	0	0
Measured on a Recurring Basis [Member] | Corporate Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member]
Securities available for sale:
Securities available for sale, at fair value	21,459	19,037
Measured on a Recurring Basis [Member] | Corporate Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member]
Securities available for sale:
Securities available for sale, at fair value	0	0
Measured on a Recurring Basis [Member] | Equity Securities [Member]
Securities available for sale:
Securities available for sale, at fair value	598	549
Measured on a Recurring Basis [Member] | Equity Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Securities available for sale:
Securities available for sale, at fair value	598	549
Measured on a Recurring Basis [Member] | Equity Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Securities available for sale:
Securities available for sale, at fair value	0	0
Measured on a Recurring Basis [Member] | Equity Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Securities available for sale:
Securities available for sale, at fair value	0	0
Measured on a Non-Recurring Basis [Member]
Measured on a non-recurring basis:
Loans measured for impairment based on the fair value of the underlying collateral	5,525	11,001
Foreclosed assets	5,703	7,991
Fair value, Measured on a non-recurring basis	11,228	18,992
Measured on a Non-Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Measured on a non-recurring basis:
Loans measured for impairment based on the fair value of the underlying collateral	0	0
Foreclosed assets	0	0
Fair value, Measured on a non-recurring basis	0	0
Measured on a Non-Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member]
Measured on a non-recurring basis:
Loans measured for impairment based on the fair value of the underlying collateral	0	0
Foreclosed assets	0	0
Fair value, Measured on a non-recurring basis	0	0
Measured on a Non-Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member]
Measured on a non-recurring basis:
Loans measured for impairment based on the fair value of the underlying collateral	5,525	11,001
Foreclosed assets	5,703	7,991
Fair value, Measured on a non-recurring basis	$ 11,228	$ 18,992

Fair Value Measurements (Financ

Fair Value Measurements (Financial Instruments) (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Financial assets:
Cash and cash equivalents	$ 148,783	$ 144,297	$ 159,674	$ 102,226
Securities available for sale, at fair value	1,028,305	1,040,386
Investment securities held to maturity:
Investment securities held to maturity, fair value	490,425	489,287
FHLBNY stock	70,896	75,726
Loans, net of allowance for loan losses	6,967,776	6,941,603
Financial liabilities:
Certificates of deposit	627,868	651,183
Total deposits	6,591,216	6,553,629
Borrowings	1,525,560	1,612,745
Derivative liabilities	2,500
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Cash and cash equivalents	148,783	144,297
Securities available for sale, at fair value	34,627	65,745
Investment securities held to maturity:
Investment securities held to maturity, fair value	4,252	4,225
FHLBNY stock	70,896	75,726
Loans, net of allowance for loan losses	0	0
Derivative assets	0	0
Financial liabilities:
Deposits other than certificates of deposits	5,963,348	5,902,446
Certificates of deposit	0	0
Total deposits	5,963,348	5,902,446
Borrowings	0	0
Derivative liabilities	0	0
Significant Other Observable Inputs (Level 2) [Member]
Financial assets:
Cash and cash equivalents	0	0
Securities available for sale, at fair value	993,678	974,641
Investment securities held to maturity:
Investment securities held to maturity, fair value	486,173	485,062
FHLBNY stock	0	0
Loans, net of allowance for loan losses	0	0
Derivative assets	8,035	7,441
Financial liabilities:
Deposits other than certificates of deposits	0	0
Certificates of deposit	628,523	653,772
Total deposits	628,523	653,772
Borrowings	1,530,444	1,617,023
Derivative liabilities	7,595	6,750
Significant Unobservable Inputs (Level 3) [Member]
Financial assets:
Cash and cash equivalents	0	0
Securities available for sale, at fair value	0	0
Investment securities held to maturity:
Investment securities held to maturity, fair value	0	0
FHLBNY stock	0	0
Loans, net of allowance for loan losses	6,955,183	6,924,440
Derivative assets	0	0
Financial liabilities:
Deposits other than certificates of deposits	0	0
Certificates of deposit	0	0
Total deposits	0	0
Borrowings	0	0
Derivative liabilities	0	0
Carrying Value [Member]
Financial assets:
Cash and cash equivalents	148,783	144,297
Securities available for sale, at fair value	1,028,305	1,040,386
Investment securities held to maturity:
Investment securities held to maturity, fair value	481,845	488,183
FHLBNY stock	70,896	75,726
Loans, net of allowance for loan losses	6,967,776	6,941,603
Derivative assets	8,035	7,441
Financial liabilities:
Deposits other than certificates of deposits	5,963,348	5,902,446
Certificates of deposit	627,868	651,183
Total deposits	6,591,216	6,553,629
Borrowings	1,525,560	1,612,745
Derivative liabilities	7,595	6,750
Fair Value [Member]
Financial assets:
Cash and cash equivalents	148,783	144,297
Securities available for sale, at fair value	1,028,305	1,040,386
Investment securities held to maturity:
Investment securities held to maturity, fair value	490,425	489,287
FHLBNY stock	70,896	75,726
Loans, net of allowance for loan losses	6,955,183	6,924,440
Derivative assets	8,035	7,441
Financial liabilities:
Deposits other than certificates of deposits	5,963,348	5,902,446
Certificates of deposit	628,523	653,772
Total deposits	6,591,871	6,556,218
Borrowings	1,530,444	1,617,023
Derivative liabilities	7,595	6,750
U.S. Treasury Obligations [Member]
Financial assets:
Securities available for sale, at fair value	5,994	8,008
U.S. Treasury Obligations [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Securities available for sale, at fair value	5,994	8,008
U.S. Treasury Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets:
Securities available for sale, at fair value	0	0
U.S. Treasury Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member]
Financial assets:
Securities available for sale, at fair value	0	0
U.S. Treasury Obligations [Member] | Carrying Value [Member]
Financial assets:
Securities available for sale, at fair value	5,994	8,008
U.S. Treasury Obligations [Member] | Fair Value [Member]
Financial assets:
Securities available for sale, at fair value	5,994	8,008
Agency Obligations [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Securities available for sale, at fair value	28,035	57,188
Investment securities held to maturity:
Investment securities held to maturity, fair value	4,252	4,225
Agency Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets:
Securities available for sale, at fair value	0	0
Investment securities held to maturity:
Investment securities held to maturity, fair value	0	0
Agency Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member]
Financial assets:
Securities available for sale, at fair value	0	0
Investment securities held to maturity:
Investment securities held to maturity, fair value	0	0
Agency Obligations [Member] | Carrying Value [Member]
Financial assets:
Securities available for sale, at fair value	28,035	57,188
Investment securities held to maturity:
Investment securities held to maturity, fair value	4,307	4,306
Agency Obligations [Member] | Fair Value [Member]
Financial assets:
Securities available for sale, at fair value	28,035	57,188
Investment securities held to maturity:
Investment securities held to maturity, fair value	4,252	4,225
Mortgage-Backed Securities [Member]
Financial assets:
Securities available for sale, at fair value	968,412	951,861
Investment securities held to maturity:
Investment securities held to maturity, fair value	492	924
Mortgage-Backed Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Securities available for sale, at fair value	0	0
Investment securities held to maturity:
Investment securities held to maturity, fair value	0	0
Mortgage-Backed Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets:
Securities available for sale, at fair value	968,412	951,861
Investment securities held to maturity:
Investment securities held to maturity, fair value	492	924
Mortgage-Backed Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Financial assets:
Securities available for sale, at fair value	0	0
Investment securities held to maturity:
Investment securities held to maturity, fair value	0	0
Mortgage-Backed Securities [Member] | Carrying Value [Member]
Financial assets:
Securities available for sale, at fair value	968,412	951,861
Investment securities held to maturity:
Investment securities held to maturity, fair value	475	893
Mortgage-Backed Securities [Member] | Fair Value [Member]
Financial assets:
Securities available for sale, at fair value	968,412	951,861
Investment securities held to maturity:
Investment securities held to maturity, fair value	492	924
State And Municipal Obligations [Member]
Financial assets:
Securities available for sale, at fair value	3,807	3,743
Investment securities held to maturity:
Investment securities held to maturity, fair value	475,759	474,852
State And Municipal Obligations [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Securities available for sale, at fair value	0	0
Investment securities held to maturity:
Investment securities held to maturity, fair value	0	0
State And Municipal Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets:
Securities available for sale, at fair value	3,807	3,743
Investment securities held to maturity:
Investment securities held to maturity, fair value	475,759	474,852
State And Municipal Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member]
Financial assets:
Securities available for sale, at fair value	0	0
Investment securities held to maturity:
Investment securities held to maturity, fair value	0	0
State And Municipal Obligations [Member] | Carrying Value [Member]
Financial assets:
Securities available for sale, at fair value	3,807	3,743
Investment securities held to maturity:
Investment securities held to maturity, fair value	467,113	473,653
State And Municipal Obligations [Member] | Fair Value [Member]
Financial assets:
Securities available for sale, at fair value	3,807	3,743
Investment securities held to maturity:
Investment securities held to maturity, fair value	475,759	474,852
Corporate Obligations [Member]
Financial assets:
Securities available for sale, at fair value	21,459	19,037
Investment securities held to maturity:
Investment securities held to maturity, fair value	9,922	9,286
Corporate Obligations [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Securities available for sale, at fair value	0	0
Investment securities held to maturity:
Investment securities held to maturity, fair value	0	0
Corporate Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets:
Securities available for sale, at fair value	21,459	19,037
Investment securities held to maturity:
Investment securities held to maturity, fair value	9,922	9,286
Corporate Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member]
Financial assets:
Securities available for sale, at fair value	0	0
Investment securities held to maturity:
Investment securities held to maturity, fair value	0	0
Corporate Obligations [Member] | Carrying Value [Member]
Financial assets:
Securities available for sale, at fair value	21,459	19,037
Investment securities held to maturity:
Investment securities held to maturity, fair value	9,950	9,331
Corporate Obligations [Member] | Fair Value [Member]
Financial assets:
Securities available for sale, at fair value	21,459	19,037
Investment securities held to maturity:
Investment securities held to maturity, fair value	9,922	9,286
Equity Securities [Member]
Financial assets:
Securities available for sale, at fair value	598	549
Equity Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Securities available for sale, at fair value	598	549
Equity Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets:
Securities available for sale, at fair value	0	0
Equity Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Financial assets:
Securities available for sale, at fair value	0	0
Equity Securities [Member] | Carrying Value [Member]
Financial assets:
Securities available for sale, at fair value	598	549
Equity Securities [Member] | Fair Value [Member]
Financial assets:
Securities available for sale, at fair value	$ 598	$ 549

Other Comprehensive Income (L51

Other Comprehensive Income (Loss) (Components of OCI) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive (loss) income, before tax	$ 950	$ (1,912)	$ 4,496	$ 14,238
Total other comprehensive income (loss), tax effect	(381)	768	(1,807)	(5,718)
Reclassification adjustment for losses (gains) included in net income, after tax	(36)	(115)	(105)	(456)
Total other comprehensive income (loss)	569	(1,144)	2,689	8,520
Unrealized gains and losses on securities available for sale [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net (losses) gains arising during the period, before tax	799	(2,575)	4,136	14,260
Reclassification adjustment for losses (gains) included in net income, before tax	0	43	0	(54)
Total other comprehensive (loss) income, before tax	799	(2,532)	4,136	14,206
Net (losses) gains arising during the period, tax effect	(320)	1,034	(1,658)	(5,727)
Reclassification adjustment for losses (gains) included in net income, tax effect	0	(17)	0	22
Total other comprehensive income (loss), tax effect	(320)	1,017	(1,658)	(5,705)
Net (losses) gains arising during the period, after tax	479	(1,541)	2,478	8,533
Reclassification adjustment for losses (gains) included in net income, after tax	0	26	0	(32)
Total other comprehensive income (loss)	479	(1,515)	2,478	8,501
Unrealized gains (losses) on derivatives (cash flow hedges) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive (loss) income, before tax	90	384	177	(603)
Total other comprehensive income (loss), tax effect	(36)	(154)	(71)	242
Total other comprehensive income (loss)	54	230	106	(361)
Post-retirement obligations [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive (loss) income, before tax	61	236	183	635
Total other comprehensive income (loss), tax effect	(25)	(95)	(78)	(255)
Total other comprehensive income (loss)	$ 36	$ 141	$ 105	$ 380

Other Comprehensive Income (L52

Other Comprehensive Income (Loss) (Components of AOCI) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			$ 1,251,781	$ 1,196,065
Current period other comprehensive income (loss)	$ 569	$ (1,144)	2,689	8,520
Ending Balance	1,300,172	1,244,280	1,300,172	1,244,280
Unrealized gains on securities available for sale [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	1,489	13,967	(510)	3,951
Current period other comprehensive income (loss)	479	(1,515)	2,478	8,501
Ending Balance	1,968	12,452	1,968	12,452
Post-retirement obligations [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(2,987)	(6,185)	(3,056)	(6,424)
Current period other comprehensive income (loss)	36	141	105	380
Ending Balance	(2,951)	(6,044)	(2,951)	(6,044)
Unrealized gains (losses) on derivatives (cash flow hedges) [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	221	(664)	169	(73)
Current period other comprehensive income (loss)	54	230	106	(361)
Ending Balance	275	(434)	275	(434)
Accumulated Other Comprehensive Income (Loss) [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(1,277)	7,118	(3,397)	(2,546)
Current period other comprehensive income (loss)	569	(1,144)	2,689	8,520
Ending Balance	$ (708)	$ 5,974	$ (708)	$ 5,974

Other Comprehensive Income (L53

Other Comprehensive Income (Loss) (Reclassifications Out of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax expense	$ (11,969)	$ (9,281)	$ (30,788)	$ (26,798)
Net income	26,575	22,906	74,466	65,235
Net of tax	36	115	105	456
Unrealized gains on securities available for sale [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Compensation and employee benefits, amortization of actuarial losses (gains)	0	(43)	0	54
Income tax expense	0	17	0	(22)
Net of tax	0	(26)	0	32
Post-retirement obligations [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Compensation and employee benefits, amortization of actuarial losses (gains)	61	236	183	708
Income tax expense	(25)	(95)	(78)	(284)
Net of tax	36	141	105	424
Reclassification adjustment [Member] | Unrealized gains on securities available for sale [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net gain on securities transactions	0	(43)	0	54
Income tax expense	0	17	0	(22)
Net income	$ 0	$ (26)	$ 0	$ 32

Derivatives and Hedging Activ54

Derivatives and Hedging Activities (Narrative) (Details)	9 Months Ended
	Sep. 30, 2017USD ($)instrument	Dec. 31, 2016USD ($)instrument
Derivative [Line Items]
Derivative instruments in accumulated other comprehensive income reclassified to interest expense	$ 52,400
Derivative liability, notional amount	60,000,000
Derivative liabilities	2,500,000
Collateral against obligations	$ 3,100,000
Derivatives Not Designated as a Hedging Instruments [Member] | Interest rate products [Member]
Derivative [Line Items]
Number of derivative instruments held (in instrument) | instrument	46	36
Derivative notional amount	$ 698,500,000	$ 582,200,000
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Number of outstanding derivatives | instrument	2

Derivatives and Hedging Activ55

Derivatives and Hedging Activities (Fair Value) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Derivatives Not Designated as a Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 7,577	$ 7,159
Liability Derivatives	7,595	6,750
Derivatives Not Designated as a Hedging Instruments [Member] | Other Assets [Member] | Interest rate products [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	7,575	7,156
Derivatives Not Designated as a Hedging Instruments [Member] | Other Assets [Member] | Credit contracts [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	2	3
Derivatives Not Designated as a Hedging Instruments [Member] | Other Liabilities [Member] | Interest rate products [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	7,595	6,750
Derivatives Not Designated as a Hedging Instruments [Member] | Other Liabilities [Member] | Credit contracts [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	0	0
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	458	282
Liability Derivatives	0	0
Designated as Hedging Instrument [Member] | Other Assets [Member] | Interest rate products [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	458	282
Designated as Hedging Instrument [Member] | Other Liabilities [Member] | Interest rate products [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 0	$ 0

Derivatives and Hedging Activ56

Derivatives and Hedging Activities (Gains and Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Derivatives Not Designated as a Hedging Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in Income on derivatives for the three months ended	$ (36)	$ (90)	$ (427)	$ (957)
Derivatives Not Designated as a Hedging Instruments [Member] | Interest rate products [Member] | Other income (expense) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in Income on derivatives for the three months ended	(36)	(95)	(428)	(1,060)
Derivatives Not Designated as a Hedging Instruments [Member] | Credit contracts [Member] | Other income (expense) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in Income on derivatives for the three months ended	0	5	1	103
Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in Income on derivatives for the three months ended	(59)	(129)	(166)	(366)
Designated as Hedging Instrument [Member] | Interest rate products [Member] | Other income (expense) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in Income on derivatives for the three months ended	$ (59)	$ (129)	$ (166)	$ (366)