Provident Financial Services (PFS) 10-Q 11 May 15 2014 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2015	1-May-15
Document Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	FALSE
Document Period End Date	31-Mar-15
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q1
Trading Symbol	PFS
Entity Registrant Name	PROVIDENT FINANCIAL SERVICES INC
Entity Central Index Key	1178970
Current Fiscal Year End Date	-19
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		65,623,167

Consolidated_Statements_of_Fin

Consolidated Statements of Financial Condition (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
ASSETS
Cash and due from banks	$89,760	$102,484
Short-term investments	1,114	1,278
Total cash and cash equivalents	90,874	103,762
Securities available for sale, at fair value	1,047,559	1,074,395
Investment securities held to maturity (fair value of $487,671 at March 31, 2015 (unaudited) and $482,473 at December 31, 2014)	473,704	469,528
Federal Home Loan Bank stock	67,455	69,789
Loans	6,124,699	6,085,505
Less allowance for loan losses	61,110	61,734
Net loans	6,063,589	6,023,771
Foreclosed assets, net	5,924	5,098
Banking premises and equipment, net	92,498	92,990
Accrued interest receivable	24,542	25,228
Intangible assets	403,505	404,422
Bank-owned life insurance	179,060	177,712
Other assets	76,427	76,682
Total assets	8,525,137	8,523,377
Deposits:
Demand deposits	4,031,665	3,971,487
Savings deposits	985,464	995,347
Certificates of deposit of $100,000 or more	342,506	342,072
Other time deposits	463,416	483,617
Total deposits	5,823,051	5,792,523
Mortgage escrow deposits	23,653	21,649
Borrowed funds	1,468,404	1,509,851
Other liabilities	52,358	55,255
Total liabilities	7,367,466	7,379,278
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 65,171,983 shares outstanding at March 31, 2015 (unaudited) and 64,905,905 outstanding at December 31, 2014	832	832
Additional paid-in capital	996,382	995,053
Retained earnings	474,280	465,276
Accumulated other comprehensive income	3,735	29
Treasury stock	-272,895	-271,779
Unallocated common stock held by the Employee Stock Ownership Plan	-44,663	-45,312
Common stock acquired by the Directors’ Deferred Fee Plan	-7,090	-7,113
Deferred compensation – Directors’ Deferred Fee Plan	7,090	7,113
Total stockholders’ equity	1,157,671	1,144,099
Total liabilities and stockholders’ equity	$8,525,137	$8,523,377

Consolidated_Statements_of_Fin1

Consolidated Statements of Financial Condition (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]
Investment securities held to maturity, fair value	$487,671	$482,473
Preferred stock, par value	$0.01	$0.01
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock, shares issued	0	0
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	83,209,293	83,209,293
Common stock, shares outstanding	65,171,983	64,905,905

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Interest income:
Real estate secured loans	$43,289	$38,552
Consumer loans	13,439	10,547
Consumer loans	5,794	5,662
Securities available for sale and Federal Home Loan Bank Stock	6,301	7,082
Investment securities held to maturity	3,396	2,670
Deposits, Federal funds sold and other short-term investments	12	10
Total interest income	72,231	64,523
Interest expense:
Deposits	3,588	3,738
Borrowed funds	6,715	5,584
Total interest expense	10,303	9,322
Net interest income	61,928	55,201
Provision for loan losses	600	400
Net interest income after provision for loan losses	61,328	54,801
Non-interest income:
Fees	6,054	4,802
Wealth management income	2,558	2,053
Bank-owned life insurance	1,348	1,302
Net gain (loss) on securities transactions	2	-350
Other income	341	309
Total non-interest income	10,303	8,116
Non-interest expense:
Compensation and employee benefits	24,201	21,393
Net occupancy expense	7,172	6,089
Data processing expense	3,027	2,797
FDIC insurance	1,218	1,136
Amortization of intangibles	927	283
Advertising and promotion expense	761	1,065
Other operating expenses	6,131	5,427
Total non-interest expense	43,437	38,190
Income before income tax expense	28,194	24,727
Income tax expense	8,392	7,698
Net income	$19,802	$17,029
Basic earnings per share (usd per share)	$0.32	$0.30
Weighted average basic shares outstanding (in shares)	62,673,887	57,369,039
Diluted earnings per share (usd per share)	$0.32	$0.30
Weighted average diluted shares outstanding (in shares)	62,840,951	57,528,419

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$19,802	$17,029
Unrealized gains and losses on securities available for sale:
Net unrealized gains arising during the period	3,711	3,719
Reclassification adjustment for (gains) losses included in net income	-1	207
Total	3,710	3,926
Amortization related to post-retirement obligations	-4	-48
Total other comprehensive income	3,706	3,878
Total comprehensive income	$23,508	$20,907

Consolidated_Statements_of_Cha

Consolidated Statements of Changes in Stockholders' Equity (USD $)	Total	COMMON STOCK	ADDITIONAL PAID-IN CAPITAL	RETAINED EARNINGS	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	TREASURY STOCK	UNALLOCATED ESOP SHARES	COMMON STOCK ACQUIRED BY DDFP	Deferred Compensation DDFP [Member]
In Thousands
Balance at Dec. 31, 2013	$1,010,753	$832	$1,026,144	$427,763	($4,851)	($390,380)	($48,755)	($7,205)	$7,205
Net income	17,029			17,029
Other comprehensive income, net of tax	3,878				3,878
Cash dividends declared	-9,190			-9,190
Distributions from DDFP	0							23	-23
Purchases of treasury stock	-3,881					-3,881
Shares issued dividend reinvestment plan	334		0			334
Allocation of ESOP shares	756		42				714
Allocation of SAP shares	1,583		1,583
Transfer of treasury shares to SAP	0		-4,253			4,253
Allocation of stock options	79		79
Balance at Mar. 31, 2014	1,021,341	832	1,023,595	435,602	-973	-389,674	-48,041	-7,182	7,182
Balance at Dec. 31, 2014	1,144,099	832	995,053	465,276	29	-271,779	-45,312	7,113	-7,113
Net income	19,802			19,802
Other comprehensive income, net of tax	3,706				3,706
Cash dividends declared	-10,798			-10,798
Distributions from DDFP	0							-23	23
Purchases of treasury stock	-1,882					-1,882
Shares issued dividend reinvestment plan	377		23			354
Stock option exercises	395		-17			412
Allocation of ESOP shares	687		38				649
Allocation of SAP shares	1,213		1,213
Allocation of stock options	72		72
Balance at Mar. 31, 2015	$1,157,671	$832	$996,382	$474,280	$3,735	($272,895)	($44,663)	$7,090	($7,090)

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income	$19,802	$17,029
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of intangibles	3,333	2,094
Provision for loan losses	600	400
Deferred tax expense	1,748	2,396
Increase in cash surrender value of Bank-owned life insurance	-1,348	-1,302
Net amortization of premiums and discounts on securities	2,655	2,276
Accretion of net deferred loan fees	-946	-746
Amortization of premiums on purchased loans, net	292	153
Net increase in loans originated for sale	-3,869	-8,267
Proceeds from sales of loans originated for sale	4,056	8,390
Proceeds from sales of foreclosed assets	288	1,374
ESOP expense	687	756
Allocation of stock award shares	852	1,306
Allocation of stock options	72	79
Net gain on sale of loans	-187	-123
Net (gain) loss on securities transactions	-2	350
Net gain on sale of premises and equipment	-5	-1
Net loss (gain) on sale of foreclosed assets	32	-110
Decrease in accrued interest receivable	686	1,216
(Increase) decrease in other assets	-2,287	269
Decrease in other liabilities	-2,897	-4,224
Net cash provided by operating activities	23,562	23,315
Cash flows from investing activities:
Proceeds from maturities, calls and paydowns of investment securities held to maturity	5,343	19,388
Purchases of investment securities held to maturity	-10,220	-19,926
Proceeds from sales of securities	0	6,085
Proceeds from maturities, calls and paydowns of securities available for sale	45,848	44,462
Purchases of securities available for sale	-14,769	-18,566
BOLI benefits received	0	1,905
Purchases of loans	-23,692	-8,546
Net increase in loans	-15,994	-56,304
Proceeds from sales of premises and equipment	5	0
Purchases of premises and equipment	-2,148	-5,776
Net cash used in investing activities	-15,627	-37,278
Cash flows from financing activities:
Net increase (decrease) in deposits	30,528	-11,051
Increase in mortgage escrow deposits	2,004	1,852
Purchases of treasury stock	-1,882	-3,881
Cash dividends paid to stockholders	-10,798	-9,190
Shares issued dividend reinvestment plan	377	334
Stock options exercised	395	0
Proceeds from long-term borrowings	82,917	181,991
Payments on long-term borrowings	-87,000	-25,000
Net (decrease) increase in short-term borrowings	-37,364	-140,658
Net cash used in financing activities	-20,823	-5,603
Net decrease in cash and cash equivalents	-12,888	-19,566
Cash and cash equivalents at beginning of period	103,762	101,224
Cash and cash equivalents at end of period	90,874	81,658
Cash paid during the period for:
Interest on deposits and borrowings	9,804	9,176
Income taxes	8,057	1,502
Non-cash investing activities:
Transfer of loans receivable to foreclosed assets	$1,146	$2,481

Summary_of_Significant_Account

Summary of Significant Accounting Policies (Notes)	3 Months Ended
	Mar. 31, 2015
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, The 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 statements of financial condition and the results of operations 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 months ended March 31, 2015 are not necessarily indicative of the results of operations that may be expected for all of 2015.
	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.
	These unaudited consolidated financial statements should be read in conjunction with the December 31, 2014 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 months ended March 31, 2015 and 2014 (dollars in thousands, except per share amounts):
		Three months ended March 31,
		2015					2014
		Net		Weighted	Per		Net		Weighted	Per
		Income		Average	Share		Income		Average	Share
				Common	Amount				Common	Amount
				Shares					Shares
				Outstanding					Outstanding
	Net income	$	19,802				$	17,029
	Basic earnings per share:
	Income available to common stockholders	$	19,802	62,673,887	$	0.32	$	17,029	57,369,039	$	0.3
	Dilutive shares			167,064					159,380
	Diluted earnings per share:
	Income available to common stockholders	$	19,802	62,840,951	$	0.32	$	17,029	57,528,419	$	0.3
	Anti-dilutive stock options and awards at March 31, 2015 and 2014, totaling 818,059 shares and 838,801 shares, respectively, were excluded from the earnings per share calculations.

Business_Combinations

Business Combinations	3 Months Ended
	Mar. 31, 2015
Business Combinations [Abstract]
Business Combinations	Business Combinations
	On May 30, 2014, the Company completed its acquisition of Team Capital Bank ("Team Capital"), which after purchase accounting adjustments added $964.0 million to total assets, $631.2 million to loans, and $769.9 million to deposits. Total consideration paid for Team Capital was $115.1 million: $31.6 million in cash and 4.9 million shares of common stock valued at $83.5 million on the acquisition date. Team Capital was merged with and into the Company's subsidiary, The Provident Bank, as of the close of business on the date of acquisition.
	The transaction was accounted for under the acquisition method of accounting. Under this method of accounting, the purchase price has been allocated to the respective assets acquired and liabilities assumed based upon their estimated fair values, net of tax. The excess of consideration paid over the fair value of the net assets acquired has been recorded as goodwill.
	The following table summarizes the estimated fair values of the assets acquired and the liabilities assumed at the date of acquisition from Team Capital, net of cash consideration paid (in thousands):
		At May 30, 2014
	Assets acquired:
	Cash and cash equivalents, net	$	68,650
	Securities available for sale	157,635
	Loans	631,209
	Bank-owned life insurance	22,319
	Banking premises and equipment	24,778
	Accrued interest receivable	3,060
	Goodwill	40,354
	Other intangibles assets	9,868
	Foreclosed assets, net	653
	Other assets	5,448
	Total assets acquired	963,974
	Liabilities assumed:
	Deposits	769,936
	Borrowed Funds	112,835
	Other liabilities	(2,314		)
	Total liabilities assumed	880,457
	Net assets acquired	$	83,517
	The calculation of goodwill is subject to change for up to one year after the date of acquisition as additional information relative to the closing date estimates and uncertainties become available. As the Company finalizes its review of the acquired assets and liabilities, certain adjustments to the recorded carrying values may be required.
	Fair Value Measurement of Assets and Liabilities Assumed
	The methods used to determine the fair value of the assets acquired and liabilities assumed in the Team Capital acquisition were as follows:
	Securities Available for Sale
	The estimated fair values of the investment securities classified as available for sale were calculated utilizing Level 1 and Level 2 inputs. Management reviewed the data and assumptions used by its third party provider in pricing the securities to ensure the highest level of significant inputs is derived from observable market data. These prices were validated against other pricing sources and broker-dealer indications.
	Loans
	The acquired loan portfolio was valued based on current guidance which defines fair value as the price that would be received to sell an asset or transfer a liability in an orderly transaction between market participants at the measurement date. Level 3 inputs were utilized to value the portfolio and included the use of present value techniques employing cash flow estimates and the incorporated assumptions that marketplace participants would use in estimating fair values. In instances where reliable market information was not available, the Company used its own assumptions in an effort to determine reasonable fair value. Specifically, Management utilized three separate fair value analyses which a market participant would employ in estimating the total fair value adjustment. The three separate fair valuation methodologies used were: 1) interest rate loan fair value analysis; 2) general credit fair value adjustment; and 3) specific credit fair value adjustment.
	To prepare the interest rate fair value analysis, loans were grouped by characteristics such as loan type, term, collateral and rate. Market rates for similar loans were obtained from various external data sources and reviewed by Company management for reasonableness. The average of these rates was used as the fair value interest rate a market participant would utilize. A present value approach was utilized to calculate the interest rate fair value adjustment.
	The general credit fair value adjustment was calculated using a two part general credit fair value analysis: 1) expected lifetime losses; and 2) estimated fair value adjustment for qualitative factors. The expected lifetime losses were calculated using an average of historical losses of the Company, the acquired bank and peer banks. The adjustment related to qualitative factors was impacted by general economic conditions and the risk related to lack of familiarity with the originator's underwriting process.
	To calculate the specific credit fair value adjustment, management reviewed the acquired loan portfolio for loans meeting the definition of an impaired loan with deteriorated credit quality. Loans meeting this definition were reviewed by comparing the contractual cash flows to expected collectible cash flows. The aggregate expected cash flows less the acquisition date fair value resulted in an accretable yield amount. The accretable yield amount will be recognized over the life of the loans on a level yield basis as an adjustment to yield.
	Deposits and Core Deposit Premium
	Core deposit premium represents the value assigned to demand, interest checking, money market and savings accounts acquired as part of an acquisition. The core deposit premium value represents the future economic benefit, including the present value of future tax benefits, of the potential cost savings from acquiring core deposits as part of an acquisition compared to the cost of alternative funding sources, and was valued utilizing Level 2 inputs.
	Time deposits are not considered to be core deposits as they are assumed to have a low expected average life upon acquisition. The fair value of time deposits represents the present value of the expected contractual payments discounted by market rates for similar time deposits, and was valued utilizing Level 2 inputs.
	Borrowed Funds
	The fair value for borrowed funds was obtained from actual prepayment rates from the Federal Home Loan Bank ("FHLB") of Pittsburgh, a Level 2 input. These borrowings were redeemed after the acquisition date and the fair value adjustment was fully amortized in the quarter ended June 30, 2014.

Investment_Securities_Notes

Investment Securities (Notes)	3 Months Ended
	Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities
	At March 31, 2015, the Company had $1.05 billion and $473.7 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 on certain investment securities in future periods. The total number of held to maturity and available for sale securities in an unrealized loss position as of March 31, 2015 totaled 131, compared with 206 at December 31, 2014. All securities with unrealized losses at March 31, 2015 were analyzed for other-than-temporary impairment. Based upon this analysis, the Company believes that as of March 31, 2015, such securities with unrealized loss positions 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 March 31, 2015 and December 31, 2014 (in thousands):
		31-Mar-15
		Amortized		Gross		Gross		Fair
		cost		unrealized		unrealized		value
				gains		losses
	US Treasury obligations	$	8,013	58		—		8,071
	Agency obligations	94,719		442		(4	)	95,157
	Mortgage-backed securities	913,848		19,120		(855	)	932,113
	State and municipal obligations	5,934		149		—		6,083
	Corporate obligations	5,517		87		(8	)	5,596
	Equity securities	397		142		—		539
		$	1,028,428	19,998		(867	)	1,047,559
		31-Dec-14
		Amortized		Gross		Gross		Fair
		cost		unrealized		unrealized		value
				gains		losses
	US Treasury obligations	$	8,016	3		(3	)	8,016
	Agency obligations	94,871		268		(63	)	95,076
	Mortgage-backed securities	944,796		15,610		(3,149	)	957,257
	State and municipal obligations	6,855		147		—		7,002
	Corporate obligations	6,526		9		(15	)	6,520
	Equity securities	397		127		—		524
		$	1,061,461	16,164		(3,230	)	1,074,395
	The amortized cost and fair value of securities available for sale at March 31, 2015, 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.
		31-Mar-15
		Amortized		Fair
		cost		value
	Due in one year or less	$	30,687	30,771
	Due after one year through five years	77,505		77,984
	Due after five years through ten years	3,017		3,102
	Due after ten years	2,974		3,050
		$	114,183	114,907
	Mortgage-backed securities totaling $913.8 million at amortized cost and $932.1 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 $539,000 at fair value.
	There were no sales of securities from the available for sale portfolio during the three months ended March 31, 2015. For the same period last year, proceeds from the sale of securities available for sale were $6,085,000, resulting in gross losses of $365,000 and no gross gains. Also, for the three months ended March 31, 2015, proceeds from calls on securities available for sale totaled $465,000, resulting in gross gains of $2,000 and no gross losses. For the three months ended March 31, 2014, proceeds from calls on securities available for sale totaled $740,000 resulting in gross gains of $2,000 and no gross losses.
	The following table presents a roll-forward of the credit loss component of other-than-temporary impairment (“OTTI”) on debt securities for which a non-credit component of OTTI was recognized in other comprehensive income. OTTI recognized in earnings for credit-impaired debt securities is presented in two components based upon whether the current period is the first time a debt security was credit-impaired (initial credit impairment), or whether the current period is not the first time a debt security was credit-impaired (subsequent credit impairment). Changes in the credit loss component of credit-impaired debt securities were as follows (in thousands):
		Three months ended March 31,
		2015		2014
	Beginning credit loss amount	$	—	1,674
	Add: Initial OTTI credit losses	—		—
	Subsequent OTTI credit losses	—		—
	Less: Realized losses for securities sold	—		1,540
	Securities intended or required to be sold	—		—
	Increases in expected cash flows on debt securities	—		—
	Ending credit loss amount	$	—	134
	The Company did not incur an OTTI charge on securities in the available for sale portfolio for the three months ended March 31, 2015 or 2014. For the three months ended March 31, 2014, the Company realized a $365,000 loss on the sale of a previously impaired non-agency mortgage-backed security, and had previously incurred cumulative credit losses of $1.5 million on this security.
	The following tables represent the Company’s disclosure regarding securities available for sale with temporary impairment at March 31, 2015 and December 31, 2014 (in thousands):
		March 31, 2015 Unrealized Losses
		Less than 12 months				12 months or longer					Total
		Fair value		Gross		Fair		Gross			Fair		Gross
				unrealized		value		unrealized			value		unrealized
				losses				losses					losses
	Agency obligations	8,092		(4	)	—		—			8,092		(4	)
	Mortgage-backed securities	97,490		(350	)	54,204		(505	)		151,694		(855	)
	Corporate obligations	995		(8	)	—		—			995		(8	)
		$	106,577	(362	)	54,204		(505	)		160,781		(867	)
		December 31, 2014 Unrealized Losses
		Less than 12 months				12 months or longer						Total
		Fair		Gross		Fair		Gross				Fair		Gross
		value		unrealized		value		unrealized				value		unrealized
				losses				losses						losses
	US Treasury obligations	$	5,937	(3	)	—		—		5,937,000		5,937		(3	)
Agency obligations	$	24,404	(40	)	5,010		(23	)			29,414		(63	)
Mortgage-backed securities	55,488		(221	)	206,669		(2,928	)			262,157		(3,149	)
Corporate obligations	3,466		(15	)	—		—		3,466,000		3,466		(15	)
	$	89,295	(279	)	211,679		(2,951	)			300,974		(3,230	)
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 March 31, 2015, 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 March 31, 2015 totaled 21, compared with 43 at December 31, 2014. At March 31, 2015, there were four private label mortgage-backed securities in an unrealized loss position, with an amortized cost of $3,003,000 and an unrealized loss of $21,000. These private label mortgage-backed securities were above investment grade at March 31, 2015.
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 other-than-temporary impairment existed during the three months ended March 31, 2015. The Company believes that no other-than-temporary impairment of the securities available for sale portfolio existed at March 31, 2015.
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 March 31, 2015 and December 31, 2014 (in thousands):
	31-Mar-15
	Amortized		Gross		Gross		Fair
	cost		unrealized		unrealized		value
			gains		losses
Agency obligations	$	7,131	21		(9	)	7,143
Mortgage-backed securities	2,511		109		—		2,620
State and municipal obligations	453,339		14,715		(933	)	467,121
Corporate obligations	10,723		65		(1	)	10,787
	$	473,704	14,910		(943	)	487,671
	31-Dec-14
	Amortized		Gross		Gross		Fair
	cost		unrealized		unrealized		value
			gains		losses
Agency obligations	$	6,813	17		(20	)	6,810
Mortgage-backed securities	2,816		123		—		2,939
State and municipal obligations	449,410		13,814		(986	)	462,238
Corporate obligations	10,489		29		(32	)	10,486
	$	469,528	13,983		(1,038	)	482,473
The Company generally purchases securities for long-term investment purposes, and differences between amortized cost and fair values may fluctuate during the investment period. For the three months ended March 31, 2015, proceeds from calls on securities available for sale totaled $4,073,000, with no gross gains or losses recognized. For the three months ended March 31, 2014, the Company recognized gains of $13,000 and no gross losses related to calls of certain securities in the held to maturity portfolio, with proceeds from the calls totaling $6,395,000. There were no sales of securities from the held to maturity portfolio for the three months ended March 31, 2015 and 2014.
The amortized cost and fair value of investment securities in the held to maturity portfolio at March 31, 2015 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.
	31-Mar-15
	Amortized		Fair
	cost		value
Due in one year or less	$	8,452	8,503
Due after one year through five years	59,079		60,587
Due after five years through ten years	186,690		194,565
Due after ten years	216,972		221,396
	$	471,193	485,051
Mortgage-backed securities totaling $2.5 million at amortized cost and $2.6 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.
The following tables represent the Company’s disclosure on investment securities held to maturity with temporary impairment at March 31, 2015 and December 31, 2014 (in thousands):
	March 31, 2015 Unrealized Losses
	Less than 12 months				12 months or longer					Total
	Fair		Gross		Fair		Gross			Fair		Gross
	value		unrealized		value		unrealized			value		unrealized
			losses				losses					losses
Agency obligations	$	299	(1	)	1,972		(8	)		2,271		(9	)
State and municipal obligations	42,209		(470	)	16,422		(463	)		58,631		(933	)
Corporate obligations	250		—		501		(1	)		751		(1	)
	$	42,758	(471	)	18,895		(472	)		61,653		(943	)
	December 31, 2014 Unrealized Losses
	Less than 12 months				12 months or longer					Total
	Fair		Gross		Fair		Gross			Fair		Gross
	value		unrealized		value		unrealized			value		unrealized
			losses				losses					losses
Agency obligations	$	3,735	(20	)	—		—			3,735		(20	)
State and municipal obligations	27,679		(217	)	47,079		(769	)		74,758		(986	)
Corporate obligations	6,888		(32	)	—		—			6,888		(32	)
	$	38,302	(269	)	47,079		(769	)		85,381		(1,038	)
Based upon the review of the held to maturity securities portfolio, the Company believes that as of March 31, 2015, securities with unrealized loss positions shown above do not represent impairments that are other-than-temporary. The review of the portfolio for other-than-temporary impairment 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 securities in an unrealized loss position at March 31, 2015 totaled 110, compared with 163 at December 31, 2014. The decrease in the number of securities in an unrealized loss position at March 31, 2015, was largely due to a reduction in market interest rates from December 31, 2014. All temporarily impaired investment securities were investment grade at March 31, 2015.

Loans_Receivable_and_Allowance

Loans Receivable and Allowance for Loan Losses (Notes)	3 Months Ended
	Mar. 31, 2015
Receivables [Abstract]
Loans Receivable and Allowance for Loan Losses	Loans Receivable and Allowance for Loan Losses
	Loans receivable at March 31, 2015 and December 31, 2014 are summarized as follows (in thousands):
			31-Mar-15				31-Dec-14
	Mortgage loans:
	Residential		$	1,245,711			1,251,445
	Commercial		1,688,083				1,694,359
	Multi-family		1,070,294				1,041,582
	Construction		274,001				221,102
	Total mortgage loans		4,278,089				4,208,488
	Commercial loans		1,242,565				1,262,422
	Consumer loans		601,190				611,467
	Total gross loans		6,121,844				6,082,377
	Purchased credit-impaired ("PCI") loans		4,285				4,510
	Premiums on purchased loans		5,386				5,307
	Unearned discounts		(47		)		(53	)
	Net deferred fees		(6,769		)		(6,636	)
	Total loans		$	6,124,699			6,085,505
	The following tables summarize the aging of loans receivable by portfolio segment and class of loans, excluding PCI loans (in thousands):
			31-Mar-15
			30-59				60-89		Non-accrual		Total Past			Current			Total Loans			Recorded
			Days				Days				Due and						Receivable			Investment
											Non-accrual									> 90 days
																				accruing
	Mortgage loans:
	Residential		$	8,871			5,832		16,913		31,616			1,214,095			1,245,711			—
	Commercial		1,485				292		18,203		19,980			1,668,103			1,688,083			—
	Multi-family		526				—		322		848			1,069,446			1,070,294			—
	Construction		—				—		—		—			274,001			274,001			—
	Total mortgage loans		10,882				6,124		35,438		52,444			4,225,645			4,278,089			—
	Commercial loans		3,352				18		12,035		15,405			1,227,160			1,242,565			—
	Consumer loans		3,599				1,020		3,415		8,034			593,156			601,190			—
	Total gross loans		$	17,833			7,162		50,888		75,883			6,045,961			6,121,844			—
			31-Dec-14
			30-59				60-89		Non-accrual		Total Past			Current			Total Loans			Recorded
			Days				Days				Due and						Receivable			Investment
											Non-accrual									> 90 days
																				accruing
	Mortgage loans:
	Residential		$	10,121			4,331		17,222		31,674			1,219,771			1,251,445			—
	Commercial		146				30		20,026		20,202			1,674,157			1,694,359			—
	Multi-family		—				—		321		321			1,041,261			1,041,582			—
	Construction		—				—		—		—			221,102			221,102			—
	Total mortgage loans		10,267				4,361		37,569		52,197			4,156,291			4,208,488			—
	Commercial loans		1,000				371		12,342		13,713			1,248,709			1,262,422			—
	Consumer loans		2,398				2,509		3,944		8,851			602,616			611,467			—
	Total gross loans		$	13,665			7,241		53,855		74,761			6,007,616			6,082,377			—
	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 $50.9 million and $53.9 million at March 31, 2015 and December 31, 2014, respectively. Included in non-accrual loans were $7.3 million and $8.4 million of loans which were less than 90 days past due at March 31, 2015 and December 31, 2014, respectively. There were no loans 90 days or greater past due and still accruing interest at March 31, 2015, or December 31, 2014.
	The Company defines an impaired loan as a non-homogeneous loan greater than $1.0 million for which it is probable that, based on current information, that the Bank will not collect all amounts due under the contractual terms of the loan agreement. 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; or (2) if a loan is collateral dependent, the fair value of collateral; or (3) the market price 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 analyses 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 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 as a result of this process.
	At March 31, 2015, there were 153 impaired loans totaling $90.8 million. Included in this total were 131 TDRs related to 123 borrowers totaling $61.7 million that were performing in accordance with their restructured terms and which continued to accrue interest at March 31, 2015. At December 31, 2014, there were 147 impaired loans totaling $85.4 million. Included in this total were 123 TDRs to 120 borrowers totaling $54.8 million that were performing in accordance with their restructured terms and which continued to accrue interest at December 31, 2014.
	The following table summarizes loans receivable by portfolio segment and impairment method, excluding PCI loans (in thousands):
			31-Mar-15
			Mortgage				Commercial		Consumer		Total Portfolio
			loans				loans		loans		Segments
	Individually evaluated for impairment		$	65,563			22,849		2,396		90,808
	Collectively evaluated for impairment		4,212,526				1,219,716		598,794		6,031,036
	Total		$	4,278,089			1,242,565		601,190		6,121,844
			31-Dec-14
			Mortgage				Commercial		Consumer		Total Portfolio
			loans				loans		loans		Segments
	Individually evaluated for impairment		$	66,548			16,463		2,384		85,395
	Collectively evaluated for impairment		4,141,940				1,245,959		609,083		5,996,982
	Total		$	4,208,488			1,262,422		611,467		6,082,377
The allowance for loan losses is summarized by portfolio segment and impairment classification as follows (in thousands):
		31-Mar-15
		Mortgage				Commercial		Consumer		Total Portfolio			Unallocated			Total
		loans				loans		loans		Segments
Individually evaluated for impairment		$	4,896			1,648		109		6,653			—			6,653
Collectively evaluated for impairment		27,990				22,049		4,168		54,207			250			54,457
Total		$	32,886			23,697		4,277		60,860			250			61,110
		31-Dec-14
		Mortgage				Commercial		Consumer		Total Portfolio			Unallocated			Total
		loans				loans		loans		Segments
Individually evaluated for impairment		$	4,696			2,318		113		7,127			—			7,127
Collectively evaluated for impairment		27,281				22,063		4,768		54,112			495			54,607
		$	31,977			24,381		4,881		61,239			495			61,734
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 months ended March 31, 2015 and 2014 along with their balances immediately prior to the modification date and post-modification as of March 31, 2015 and 2014:
		For the three months ended
		31-Mar-15									31-Mar-14
Troubled Debt Restructuring		Number  of			Pre-Modification			Post-Modification			Number  of			Pre-Modification				Post-Modification
		Loans			Outstanding			Outstanding			Loans			Outstanding				Outstanding
					Recorded			Recorded  Investment						Recorded  Investment				Recorded  Investment
					Investment
		($ in thousands)
Mortgage loans:
Residential		2			$	322		$	321		4			$	875			$	835
Construction		1			2,600			347			—			—				—
Total mortgage loans		3			2,922			668			4			875				835
Commercial loans		4			6,659			6,898			1			116				28
Consumer loans		1			44			42			—			—				—
Total restructured loans		8			$	9,625		$	7,608		5			$	991			$	863
All TDRs are impaired loans, which are individually evaluated for impairment, as previously discussed. Estimated collateral values of collateral dependent impaired loans modified during the three months ended March 31, 2015 and 2014 exceeded the carrying amounts of such loans. As a result, there were no charge-offs recorded on collateral dependent impaired loans presented in the preceding tables for the three months ended March 31, 2015 and 2014. The allowance for loan losses associated with the TDRs presented in the preceding tables totaled $31,000 and $41,000 for the three months ended March 31, 2015 and 2014, respectively, and were included in the allowance for loan losses for loans individually evaluated for impairment.
For the three months ended March 31, 2015, the TDRs presented in the preceding tables had a weighted average modified interest rate of approximately 5.90%, compared to a rate of 5.83% prior to modification. For the three months ended March 31, 2014, the TDRs had a weighted average modified interest rate of approximately 4.31%, compared to a rate of 5.23% prior to modification.
The following table presents loans modified as TDRs within the previous 12 months from March 31, 2015 and 2014, and for which there was a payment default (90 days or more past due) at the quarter ended March 31, 2015 and 2014.
		March 31, 2015							March 31, 2014
Troubled Debt Restructurings Subsequently Defaulted		Number of				Outstanding			Number of		Outstanding
		Loans				Recorded  Investment			Loans		Recorded  Investment
						($ in thousands)					($ in thousands)
Mortgage loans:
Residential		$	—			$	—		1		$	90
Total mortgage loans		—				—			1		90
Commercial loans		—				—			3		$	1,647
Total restructured loans		$	—			$	—		4		$	1,737
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 Team Capital acquisition, $5.2 million of the loans purchased at May 30, 2014 were determined to be PCI loans. PCI loans are accounted for at fair value, based upon the present value of expected future cash flows, with no related allowance for loan losses.
The following table presents information regarding the estimates of the contractually required payments, the cash flows expected to be collected and the estimated fair value of the PCI loans acquired from Team Capital at May 30, 2014 (in thousands):
		30-May-14
Contractually required principal and interest		$	12,505
Contractual cash flows not expected to be collected (non-accretable discount)		(6,475		)
Expected cash flows to be collected at acquisition		6,030
Interest component of expected cash flows (accretable yield)		(810		)
Fair value of acquired PCI loans		$	5,220
PCI loans declined $225,000 to $4.3 million at March 31, 2015, from $4.5 million at December 31, 2014, largely due to the full repayment and greater than projected cash flows on certain PCI loans. This resulted in a $76,000 increase in interest income for the three months ended March 31, 2015, due to the acceleration of accretable and non-accretable discount on these loans.
The following table summarizes the changes in the accretable yield for PCI loans during the three months ended March 31, 2015 (in thousands):
	Three months ended March 31, 2015
Beginning balance	$	695
Acquisition	—
Accretion	(198		)
Reclassification from non-accretable discount	184
Ending balance	$	681
The activity in the allowance for loan losses by portfolio segment for the three months ended March 31, 2015 and 2014 was as follows (in thousands):
Three months ended March 31,		Mortgage				Commercial		Consumer		Total Portfolio			Unallocated			Total
		loans				loans		loans		Segments
2015
Balance at beginning of period		$	31,977			24,381		4,881		61,239			495			61,734
Provision charged to operations		1,038				(477	)	284		845			(245	)		600
Recoveries of loans previously charged-off		65				215		211		491			—			491
Loans charged-off		(194		)		(422	)	(1,099	)	(1,715	)		—			(1,715	)
Balance at end of period		$	32,886			23,697		4,277		60,860			250			61,110
2014
Balance at beginning of period		$	34,144			24,107		4,929		63,180			1,484			64,664
Provision charged to operations		(2,000		)		1,330		144		(526	)		926			400
Recoveries of loans previously charged-off		67				243		121		431			—			431
Loans charged-off		(741		)		(519	)	(815	)	(2,075	)		—			(2,075	)
Balance at end of period		$	31,470			25,161		4,379		61,010			2,410			63,420
The following table presents loans individually evaluated for impairment by portfolio segment and class, excluding PCI loans (in thousands):
		31-Mar-15														31-Dec-14
		Unpaid				Recorded		Related		Average			Interest			Unpaid			Recorded	Related	Average	Interest
		Principal				Investment		Allowance		Recorded			Income			Principal			Investment	Allowance	Recorded	Income
		Balance								Investment			Recognized			Balance					Investment	Recognized
Loans with no related allowance
Mortgage loans:
Residential		$	15,230			10,895		—		11,048			107			14,942			10,629	—	11,138	357
Commercial		2,613				2,574		—		2,574			—			4,971			4,708	—	4,713	—
Multi-family		—				—		—		—			—			—			—	—	—	—
Construction		—				—		—		—			—			—			—	—	—	—
Total		17,843				13,469		—		13,622			107			19,913			15,337	—	15,851	357
Commercial loans		8,925				8,387		—		8,501			60			2,718			2,179	—	1,823	4
Consumer loans		1,302				854		—		862			8			1,250			830	—	870	28
Total loans		$	28,070			22,710		—		22,985			175			23,881			18,346	—	18,544	389
Loans with an allowance recorded
Mortgage loans:
Residential		$	15,444			14,824		2,382		14,864			386			15,523			14,906	2,367	15,106	555
Commercial		38,382				36,923		2,504		37,021			239			37,555			36,306	2,329	36,674	914
Multi-family		—				—		—		—			—			—			—	—	—	—
Construction		347				347		10		347			14			—			—	—	—	—
Total		54,173				52,094		4,896		52,232			639			53,078			51,212	4,696	51,780	1,469
Commercial loans		16,257				14,462		1,648		14,673			75			15,990			14,283	2,318	15,967	390
Consumer loans		1,552				1,542		109		1,548			19			1,565			1,554	113	1,578	80
Total loans		$	71,982			68,098		6,653		68,453			733			70,633			67,049	7,127	69,325	1,939
Total impaired loans
Mortgage loans:
Residential		$	30,674			25,719		2,382		25,912			493			30,465			25,535	2,367	26,244	912
Commercial		40,995				39,497		2,504		39,595			239			42,526			41,014	2,329	41,387	914
Multi-family		—				—		—		—			—			—			—	—	—	—
Construction		347				347		10		347			14			—			—	—	—	—
Total		72,016				65,563		4,896		65,854			746			72,991			66,549	4,696	67,631	1,826
Commercial loans		25,182				22,849		1,648		23,174			135			18,708			16,462	2,318	17,790	394
Consumer loans		2,854				2,396		109		2,410			27			2,815			2,384	113	2,448	108
Total loans		$	100,052			90,808		6,653		91,438			908			94,514			85,395	7,127	87,869	2,328
Specific allocations of the allowance for loan losses attributable to impaired loans totaled $6,653,000 and $7,127,000 at March 31, 2015 and December 31, 2014, respectively. At March 31, 2015 and December 31, 2014, impaired loans for which there was no related allowance for loan losses totaled $22,710,000 and $18,346,000, respectively. The average balance of impaired loans during the three months ended March 31, 2015 and December 31, 2014 was $91,438,000 and $87,869,000, respectively.
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 his or her portfolio. These risk ratings are then reviewed by the department manager and/or the Chief Lending Officer and by the Credit Administration 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 March 31, 2015
		Residential				Commercial		Multi-		Construction			Total			Commercial			Consumer	Total loans
						mortgage		family					mortgages
Special mention		$	5,832			43,749		1,105		—			50,686			57,403			1,020	109,109
Substandard		16,913				30,773		847		347			48,880			32,410			3,165	84,455
Doubtful		—				1,061		—		—			1,061			28			—	1,089
Loss		—				—		—		—			—			—			—	—
Total classified and criticized		22,745				75,583		1,952		347			100,627			89,841			4,185	194,653
Pass/Watch		1,222,966				1,612,500		1,068,342		273,654			4,177,462			1,152,724			597,005	5,927,191
Total		$	1,245,711			1,688,083		1,070,294		274,001			4,278,089			1,242,565			601,190	6,121,844
		At December 31, 2014
		Residential				Commercial		Multi-		Construction			Total			Commercial			Consumer	Total loans
						mortgage		family					mortgages
Special mention		$	4,331			18,414		851		—			23,596			45,599			2,509	71,704
Substandard		17,222				53,454		322		2,600			73,598			32,828			3,938	110,364
Doubtful		—				1,063		—		—			1,063			29			—	1,092
Loss		—				—		—		—			—			—			—	—
Total classified and criticized		21,553				72,931		1,173		2,600			98,257			78,456			6,447	183,160
Pass/Watch		1,229,892				1,621,428		1,040,409		218,502			4,110,231			1,183,966			605,020	5,899,217
Total		$	1,251,445			1,694,359		1,041,582		221,102			4,208,488			1,262,422			611,467	6,082,377

Deposits_Notes

Deposits (Notes)	3 Months Ended
	Mar. 31, 2015
Banking and Thrift [Abstract]
Deposits	Deposits
	Deposits at March 31, 2015 and December 31, 2014 are summarized as follows (in thousands):
		31-Mar-15		31-Dec-14
	Savings	$	985,464	995,347
	Money market	1,501,964		1,496,466
	NOW	1,454,504		1,425,424
	Non-interest bearing	1,075,197		1,049,597
	Certificates of deposit	805,922		825,689
	Total	$	5,823,051	5,792,523

Components_of_Net_Periodic_Ben

Components of Net Periodic Benefit Cost (Notes)	3 Months Ended
	Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Components of Net Periodic Benefit Cost	Components of Net Periodic Benefit Cost
	The Bank has a noncontributory defined benefit pension plan (the “Plan”) covering its full-time employees who had attained age 21 with at least one year of service as of April 1, 2003, the date on which the Plan was frozen. All participants in the Plan are 100% vested. The Plan’s assets are invested in investment funds and group annuity contracts currently managed by the Principal Financial Group and Allmerica Financial. In an effort to lower and reduce the volatility of its future pension costs, the Company offered a lump sum pension distribution option to its vested terminated employees in the quarter ended June 30, 2014, and the Plan paid $4.3 million to those employees that elected to receive lump sum pension distributions and the Company realized an associated charge of $1.3 million. This charge was a pro rata share of the unrecognized losses recorded in other comprehensive income.
	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 became 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 10 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 10 years of service as of December 31, 2006.
	Net periodic benefit (increase) cost for pension benefits and other post-retirement benefits for the three months ended March 31, 2015 and 2014 included the following components (in thousands):
		Three months ended March 31,
		Pension					Other post-
		benefits					retirement
							benefits
		2015			2014		2015	2014
	Service cost	$	—		—		42	42
	Interest cost	284			352		281	272
	Expected return on plan assets	(633		)	(894	)	—	—
	Amortization of prior service cost	—			—		—	(1	)
	Amortization of the net loss	194			93		—	(51	)
	Net periodic benefit (increase) cost	$	(155	)	(449	)	323	262
	The net periodic benefit (increase) cost for pension benefits and other post-retirement benefits for the three months ended March 31, 2015 was calculated using the actual January 1, 2015 pension valuation and the other post-retirement benefits valuations.

Impact_of_Recent_Accounting_Pr

Impact of Recent Accounting Pronouncements (Notes)	3 Months Ended
	Mar. 31, 2015
Accounting Changes and Error Corrections [Abstract]
Impact of Recent Accounting Pronouncements	Impact of Recent Accounting Pronouncements
	In August 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-14, “Receivables - Troubled Debt Restructurings by Creditors: Classification of Certain Government-Guaranteed Mortgage Loans upon Foreclosure.” The amendments in this update affect creditors that hold government guaranteed mortgage loans, including those guaranteed by the Federal Housing Administration and the U.S. Department of Veterans Affairs. The amendments in this update require that a mortgage loan be derecognized and that a separate other receivable be recognized upon foreclosure if the following conditions are met: (i) the loan has a government guarantee that is not separable from the loan before foreclosure, (ii) at the time of foreclosure, the creditor has the intent to convey the real estate property to the guarantor and make a claim on the guarantee, and the creditor has the ability to recover under that claim, and (iii) at the time of foreclosure, any amount of the claim that is determined on the basis of the fair value of the real estate is fixed. Upon foreclosure, the separate other receivable should be measured based on the amount of the loan balance (principal and interest) expected to be recovered from the guarantor. The amendments in this update are effective for public business entities for annual periods, and interim periods within those annual periods, beginning after December 15, 2014. The Company's adoption of this ASU did not have a significant impact on its consolidated financial statements.
	In June 2014, the FASB issued ASU No. 2014-12, "Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period," which requires that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. This update is effective for interim and annual periods beginning after December 15, 2015. The amendments can be applied prospectively to all awards granted or modified after the effective date or retrospectively to all awards with performance targets that are outstanding as of the beginning of the earliest annual period presented and to all new or modified awards thereafter. Early adoption is permitted. The Company does not expect that the adoption of this guidance will have a significant impact on the Company’s consolidated financial statements.
	Also in June 2014, the FASB issued ASU No. 2014-11, "Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures" which aligns the accounting for repurchase to maturity transactions and repurchase agreements executed as a repurchase financing with the accounting for other typical repurchase agreements. Going forward, these transactions would all be accounted for as secured borrowings. This update is effective for the first interim or annual period beginning after December 15, 2014. In addition the disclosure of certain transactions accounted for as a sale is effective for the first interim or annual period beginning on or after December 15, 2014, and the disclosure for transactions accounted for as secured borrowings is required for annual periods beginning after December 15, 2014, and interim periods beginning after March 15, 2015. Early adoption is prohibited. The Company's adoption of this ASU did not have a significant impact on its consolidated financial statements.
	In May 2014, the FASB issued ASU 2014-09, "Revenue from Contracts with Customers." The objective of this amendment is to clarify the principles for recognizing revenue and to develop a common revenue standard for U.S. GAAP. 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 non-financial assets unless those contracts are in the scope of other standards. For public entities, the amendments in this update are effective for annual reporting periods beginning after December 15, 2016. The Company does not expect that the adoption of this guidance will have a significant impact on the Company’s consolidated financial statements.
	In January 2014, the FASB issued ASU No. 2014-04, “Receivables-Troubled Debt Restructurings by Creditors (Subtopic 310-40): Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure,” which clarifies that an in-substance repossession or foreclosure occurs, and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan, upon either the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure, or the borrower conveying all interest in the residential real estate property to the creditor to satisfy that loan through completion of a deed in lieu of foreclosure or through a similar legal agreement. Additionally, this ASU requires interim and annual disclosure of both the amount of foreclosed residential real estate property held by the creditor and the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure according to local requirements of the applicable jurisdiction. ASU No. 2014-04 is effective for annual and interim periods beginning after December 15, 2014. The Company’s adoption of this ASU did not have a significant impact on its consolidated financial statements.

Fair_Value_Measurements_Notes

Fair Value Measurements (Notes)	3 Months Ended
	Mar. 31, 2015
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 pric es 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 March 31, 2015 and December 31, 2014.
	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 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 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 balance sheet 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. Currently, none of the Company’s derivatives are designated in qualifying hedging relationships. The existing interest rate derivatives result from a service provided to certain qualifying 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 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 March 31, 2015 and December 31, 2014.
	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 of up to 6%. The Company classifies these loans as Level 3 within the fair value hierarchy.
	Assets acquired through foreclosure or deed in lieu of foreclosure are carried at fair value, less estimated selling costs of up to 6%. 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 March 31, 2015 and December 31, 2014.
	The following tables present the assets and liabilities reported on the consolidated statements of financial condition at their fair values as of March 31, 2015 and December 31, 2014, by level within the fair value hierarchy:
		Fair Value Measurements at Reporting Date Using:
	(Dollars in thousands)	31-Mar-15		Quoted Prices in		Significant Other			Significant
				Active  Markets for		Observable  Inputs			Unobservable
				Identical Assets		(Level 2)			Inputs (Level 3)
				(Level 1)
	Measured on a recurring basis:
	Securities available for sale:
	US Treasury obligations	$	8,071	8,071		—			—
	Agency obligations	95,157		95,157		—			—
	Mortgage-backed securities	932,113		—		932,113			—
	State and municipal obligations	6,083		—		6,083			—
	Corporate obligations	5,596		—		5,596			—
	Equity securities	539		539		—			—
	Total securities available for sale	1,047,559		103,767		943,792			—
	Asset derivatives	3,216		—		3,216			—
		$	1,050,775	103,767		947,008			—
	Liability derivatives	$	3,285	—		3,285			—
	Measured on a non-recurring basis:
	Loans measured for impairment based on the fair value of the underlying collateral	$	23,010	—		—			23,010
	Foreclosed assets	5,924		—		—			5,924
		$	28,934	—		—			28,934
		Fair Value Measurements at Reporting Date Using:
	(Dollars in thousands)	31-Dec-14		Quoted Prices in			Significant Other			Significant
				Active  Markets for			Observable  Inputs			Unobservable
				Identical Assets			(Level 2)			Inputs (Level 3)
				(Level 1)
	Measured on a recurring basis:
	Securities available for sale:
	US Treasury obligations	$	8,016	8,016			—			—
	Agency obligations	95,076		95,076			—			—
	Mortgage-backed securities	957,257		—			957,257			—
	State and municipal obligations	7,002		—			7,002			—
	Equity securities	524		524			—			—
		1,074,395		103,616			970,779			—
	Asset derivatives	2,046		—			2,046
		$	1,076,441	$	103,616		$	972,825		$	—
	Liability derivatives	$	2,052				2,052
	Measured on a non-recurring basis:
	Loans measured for impairment based on the fair value of the underlying collateral	$	23,086	—			—			23,086
	Foreclosed assets	5,098		—			—			5,098
		$	28,184	—			—			28,184
	There were no transfers between Level 1 and Level 2 during the three months ended March 31, 2015.
	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.
FHLB-NY Stock
The carrying value of FHLB of New York (FHLB-NY) stock was its cost. The fair value of FHLB-NY 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 and estimated selling costs. 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 March 31, 2015 and December 31, 2014. Fair values are presented by level within the fair value hierarchy.
			Fair Value Measurements at March 31, 2015 Using:
(Dollars in thousands)	Carrying		Fair		Quoted Prices in			Significant  Other			Significant
	value		value		Active  Markets for			Observable  Inputs			Unobservable
					Identical Assets			(Level 2)			Inputs (Level 3)
					(Level 1)
Financial assets:
Cash and cash equivalents	$	90,874	90,874		90,874			—			—
Securities available for sale:
US Treasury obligations	8,071		8,071		8,071			—			—
Agency obligations	95,157		95,157		95,157			—			—
Mortgage-backed securities	932,113		932,113		—			932,113			—
State and municipal obligations	6,083		6,083		—			6,083			—
Corporate obligations	5,596		5,596		—			5,596			—
Equity securities	539		539		539			—			—
Total securities available for sale	$	1,047,559	1,047,559		103,767			943,792			—
Investment securities held to maturity:
Agency obligations	7,131		7,143		7,143			—			—
Mortgage-backed securities	2,511		2,620		—			2,620			—
State and municipal obligations	453,339		467,121		—			467,121			—
Corporate obligations	10,723		10,787		—			10,787			—
Total securities held to maturity	$	473,704	487,671		7,143			480,528			—
FHLB-NY stock	67,455		67,455		67,455			—			—
Loans, net of allowance for loan losses	6,063,589		6,165,229		—			—			6,165,229
Asset derivative	3,216		3,216		—			3,216			—
Financial liabilities:
Deposits other than certificates of deposits	$	5,017,129	5,017,129		5,017,129			—			—
Certificates of deposit	805,922		809,036		—			809,036			—
Total deposits	5,823,051		5,826,165		5,017,129			809,036			—
Borrowings	1,468,404		1,489,209		—			1,489,209			—
Liability derivative	3,285		3,285		—			3,285	845,000		—
			Fair Value Measurements at December 31, 2014 Using:
(Dollars in thousands)	Carrying		Fair		Quoted Prices in			Significant  Other		Significant
	value		value		Active  Markets for			Observable  Inputs		Unobservable
					Identical Assets			(Level 2)		Inputs (Level 3)
					(Level 1)
Financial assets:
Cash and cash equivalents	$	103,762	103,762		103,762			—		—
Securities available for sale:
US Treasury obligations	8,016		8,016		8,016			—		—
Agency obligations	95,076		95,076		95,076			—		—
Mortgage-backed securities	957,257		957,257		—			957,257		—
State and municipal obligations	7,002		7,002		—			7,002		—
Corporate obligations	6,520		6,520		—			6,520		—
Equity securities	524		524		524			—		—
Total securities available for sale	$	1,074,395	1,074,395		103,616			970,779		—
Investment securities held to maturity:
Agency obligations	$	6,813	6,810		6,810			—		—
Mortgage-backed securities	2,816		2,939		—			2,939		—
State and municipal obligations	449,410		462,238		—			462,238		—
Corporate obligations	10,489		10,486		—			10,486		—
Total securities held to maturity	$	469,528	482,473		6,810			475,663		—
FHLB-NY stock	69,789		69,789		69,789			—		—
Loans, net of allowance for loan losses	6,023,771		6,104,558		—			—		6,104,558
Asset derivative	2,046		2,046					2,046
Financial liabilities:
Deposits other than certificates of deposits	$	4,966,834	4,966,834		4,966,834			—		—
Certificates of deposit	825,689		830,233		—			830,233		—
Total deposits	$	5,792,523	5,797,067		4,966,834			830,233		—
Borrowings	1,509,851		1,516,966		—			1,516,966		—
Liability derivative	2,052		2,052					2,052

Other_Comprehensive_Income_Los

Other Comprehensive Income (Loss) (Notes)	3 Months Ended
	Mar. 31, 2015
Equity [Abstract]
Other Comprehensive Income (Loss)	Other Comprehensive Income
	The following table presents the components of other comprehensive income both gross and net of tax, for the three months ended March 31, 2015 and 2014 (in thousands):
			Three months ended March 31,
			2015								2014
			Before			Tax			After		Before		Tax		After
			Tax			Effect			Tax		Tax		Effect		Tax
	Components of Other Comprehensive Income:
	Unrealized gains and losses on securities available for sale:
	Net gains arising during the period		$	6,202		(2,491	)		3,711		6,287		(2,568	)	3,719
	Reclassification adjustment for (gains) losses included in net income		(2		)	1			(1	)	350		(143	)	207
	Total		6,200			(2,490	)		3,710		6,637		(2,711	)	3,926
	Amortization related to post-retirement obligations		(7		)	3			(4	)	(81	)	33		(48	)
	Total other comprehensive income		$	6,193		(2,487	)		3,706		6,556		(2,678	)	3,878
	The following tables present the changes in the components of accumulated other comprehensive income, net of tax, for the three months ended March 31, 2015 and 2014 (in thousands):
			Changes in Accumulated Other Comprehensive Income by Component, net of tax
			For the three months ended March 31,
			2015								2014
			Unrealized			Post  Retirement			Accumulated		Unrealized		Post  Retirement		Accumulated
			Gains on Securities			Obligations			Other		Gains on Securities		Obligations		Other
			Available for						Comprehensive		Available for				Comprehensive
			Sale						Income		Sale				Income
	Balance at December 31,		$	7,743		(7,714	)		29		(2,799	)	(2,052	)	(4,851	)
	Current period change in other comprehensive income (loss)		3,710			(4	)		3,706		3,926		(48	)	3,878
	Balance at March 31,		$	11,453		(7,718	)		3,735		1,127		(2,100	)	(973	)
	The following tables summarize the reclassifications out of accumulated other comprehensive income to the consolidated statements of income for the three months ended March 31, 2015 and 2014 (in thousands):
			Reclassifications Out of Accumulated Other Comprehensive
			Income ("AOCI")
			Amount reclassified from AOCI for the three months ended March 31,							Affected line item in the Consolidated
			2015			2014				Statement of Income
	Details of AOCI:
	Securities available for sale:
	Realized net gains on the sale of securities available for sale		$	2		$	(350	)		Net gain on securities transactions
			(1		)	143				Income tax expense
			1			(207		)		Net of tax
	Post retirement obligations:
	Amortization of actuarial losses (gains)		194			42				Compensation and employee benefits (1)
			(79		)	(17		)		Income tax expense
			115			25				Net of tax
	Total reclassifications		$	116		$	(182	)		Net of tax
	-1	This item is included in the computation of net periodic benefit cost. See Note 6. Components of Net Periodic Benefit Cost.

Derivatives_and_Hedging_Activi

Derivatives and Hedging Activities	3 Months Ended
	Mar. 31, 2015
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. The Company’s existing interest rate derivatives result from a service provided to certain qualifying borrowers in a loan related transaction and, therefore, are not used to manage interest rate risk in the Company’s assets or liabilities. The Company manages a matched book with respect to its derivative instruments in order to minimize its net risk exposure resulting from such transactions.
	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 as of March 31, 2015 and December 31, 2014 (in thousands):
		As of March 31, 2015
		Asset Derivatives				Liability Derivatives
		Consolidated Statements of Financial Condition	Fair			Consolidated Statements of Financial Condition	Fair
			Value				Value
	Derivatives not designated as a hedging instruments:
	Interest rate products	Other assets	$	3,208		Other liabilities	$	3,285
	Credit contracts	Other assets	8				—
	Total derivatives not designated as hedging instruments		$	3,216			$	3,285
		As of December 31, 2014
		Asset Derivatives				Liability Derivatives
		Consolidated Statements of Financial Condition	Fair			Consolidated Statements of Financial Condition	Fair
			Value				Value
	Derivatives not designated as a hedging instruments:
	Interest rate products	Other assets	$	2,040		Other liabilities	$	2,052
	Credit contracts	Other assets	6				—
	Total derivatives not designated as hedging instruments		$	2,046			$	2,052
	None of the Company’s derivatives are designated in qualifying hedging relationships. Derivatives not designated as hedges are not speculative and result from a service the Company provides to certain customers, which the Company implemented during the third quarter of 2014. The Company executes interest rate swaps with 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. As the interest rate swaps associated with this program do not meet the strict hedge accounting requirements, changes in the fair value of both the customer swaps and the offsetting swaps are recognized directly in earnings. At March 31, 2015, the Company had eleven interest rate swaps with an aggregate notional amount of $110.7 million, compared with nine interest rate swaps with an aggregate notional amount of $94.9 million at December 31, 2014.
	The tables below present the effect of the Company’s derivative financial instruments on the Consolidated Statements of Income for the quarter ended March 31, 2015 (in thousands).
			Gain (loss) recognized in Income on derivatives
		Consolidated Statements of Income	Three months ended March 31, 2015
	Derivatives not designated as a hedging instruments:
	Interest rate products	Other income	$	(65	)
	Credit contracts	Other income	1
	Total		$	(64	)
	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.
	The Company also has agreements with certain of its derivative counterparties that contain a provision that if the Company fails to maintain its status as a well / adequate 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 March 31, 2015, the termination value of derivatives in a net liability position, which includes accrued interest but excludes any adjustment for nonperformance risk, related to these agreements was $3,338,000. The Company has minimum collateral posting thresholds with certain of its derivative counterparties, and has posted collateral of $2,980,000 against its obligations under these agreements. If the Company had breached any of these provisions at March 31, 2015, it could have been required to settle its obligations under the agreements at the termination value. At March 31, 2015, there were no breaches of any provisions of the Company's derivative agreements with its counterparties.

Subsequent_Event_Notes

Subsequent Event (Notes)	3 Months Ended
	Mar. 31, 2015
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event
	On April 1, 2015, Beacon Trust Company ("Beacon") completed its acquisition of certain assets and liabilities of The MDE Group, Inc. and the equity interests of Acertus Capital Management, LLC, both Morristown, New Jersey based registered investment advisers under common ownership. Beacon Trust Company is a wholly owned subsidiary of The Provident Bank which, in turn, is wholly owned by the Company.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2015
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, The 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 statements of financial condition and the results of operations 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 months ended March 31, 2015 are not necessarily indicative of the results of operations that may be expected for all of 2015.
	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.
	These unaudited consolidated financial statements should be read in conjunction with the December 31, 2014 Annual Report to Stockholders on Form 10-K.
Earnings Per Share	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 months ended March 31, 2015 and 2014 (dollars in thousands, except per share amounts):
		Three months ended March 31,
		2015					2014
		Net		Weighted	Per		Net		Weighted	Per
		Income		Average	Share		Income		Average	Share
				Common	Amount				Common	Amount
				Shares					Shares
				Outstanding					Outstanding
	Net income	$	19,802				$	17,029
	Basic earnings per share:
	Income available to common stockholders	$	19,802	62,673,887	$	0.32	$	17,029	57,369,039	$	0.3
	Dilutive shares			167,064					159,380
	Diluted earnings per share:
	Income available to common stockholders	$	19,802	62,840,951	$	0.32	$	17,029	57,528,419	$	0.3
	Anti-dilutive stock options and awards at March 31, 2015 and 2014, totaling 818,059 shares and 838,801 shares, respectively, were excluded from the earnings per share calculations.

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Tables)	3 Months Ended
	Mar. 31, 2015
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 months ended March 31, 2015 and 2014 (dollars in thousands, except per share amounts):
		Three months ended March 31,
		2015					2014
		Net		Weighted	Per		Net		Weighted	Per
		Income		Average	Share		Income		Average	Share
				Common	Amount				Common	Amount
				Shares					Shares
				Outstanding					Outstanding
	Net income	$	19,802				$	17,029
	Basic earnings per share:
	Income available to common stockholders	$	19,802	62,673,887	$	0.32	$	17,029	57,369,039	$	0.3
	Dilutive shares			167,064					159,380
	Diluted earnings per share:
	Income available to common stockholders	$	19,802	62,840,951	$	0.32	$	17,029	57,528,419	$	0.3

Business_Combinations_Tables

Business Combinations (Tables)	3 Months Ended
	Mar. 31, 2015
Business Combinations [Abstract]
Summary of the estimated fair values of assets acquired and the liabilities assumed	The following table summarizes the estimated fair values of the assets acquired and the liabilities assumed at the date of acquisition from Team Capital, net of cash consideration paid (in thousands):
		At May 30, 2014
	Assets acquired:
	Cash and cash equivalents, net	$	68,650
	Securities available for sale	157,635
	Loans	631,209
	Bank-owned life insurance	22,319
	Banking premises and equipment	24,778
	Accrued interest receivable	3,060
	Goodwill	40,354
	Other intangibles assets	9,868
	Foreclosed assets, net	653
	Other assets	5,448
	Total assets acquired	963,974
	Liabilities assumed:
	Deposits	769,936
	Borrowed Funds	112,835
	Other liabilities	(2,314		)
	Total liabilities assumed	880,457
	Net assets acquired	$	83,517

Investment_Securities_Tables

Investment Securities (Tables)	3 Months Ended
	Mar. 31, 2015
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 March 31, 2015 and December 31, 2014 (in thousands):
		31-Mar-15
		Amortized		Gross		Gross		Fair
		cost		unrealized		unrealized		value
				gains		losses
	US Treasury obligations	$	8,013	58		—		8,071
	Agency obligations	94,719		442		(4	)	95,157
	Mortgage-backed securities	913,848		19,120		(855	)	932,113
	State and municipal obligations	5,934		149		—		6,083
	Corporate obligations	5,517		87		(8	)	5,596
	Equity securities	397		142		—		539
		$	1,028,428	19,998		(867	)	1,047,559
		31-Dec-14
		Amortized		Gross		Gross		Fair
		cost		unrealized		unrealized		value
				gains		losses
	US Treasury obligations	$	8,016	3		(3	)	8,016
	Agency obligations	94,871		268		(63	)	95,076
	Mortgage-backed securities	944,796		15,610		(3,149	)	957,257
	State and municipal obligations	6,855		147		—		7,002
	Corporate obligations	6,526		9		(15	)	6,520
	Equity securities	397		127		—		524
		$	1,061,461	16,164		(3,230	)	1,074,395
Roll-Forward of Credit Loss Component of Other-Than-Temporary Impairment	Changes in the credit loss component of credit-impaired debt securities were as follows (in thousands):
		Three months ended March 31,
		2015		2014
	Beginning credit loss amount	$	—	1,674
	Add: Initial OTTI credit losses	—		—
	Subsequent OTTI credit losses	—		—
	Less: Realized losses for securities sold	—		1,540
	Securities intended or required to be sold	—		—
	Increases in expected cash flows on debt securities	—		—
	Ending credit loss amount	$	—	134
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 March 31, 2015 and December 31, 2014 (in thousands):
		31-Mar-15
		Amortized		Gross		Gross		Fair
		cost		unrealized		unrealized		value
				gains		losses
	Agency obligations	$	7,131	21		(9	)	7,143
	Mortgage-backed securities	2,511		109		—		2,620
	State and municipal obligations	453,339		14,715		(933	)	467,121
	Corporate obligations	10,723		65		(1	)	10,787
		$	473,704	14,910		(943	)	487,671
		31-Dec-14
		Amortized		Gross		Gross		Fair
		cost		unrealized		unrealized		value
				gains		losses
	Agency obligations	$	6,813	17		(20	)	6,810
	Mortgage-backed securities	2,816		123		—		2,939
	State and municipal obligations	449,410		13,814		(986	)	462,238
	Corporate obligations	10,489		29		(32	)	10,486
		$	469,528	13,983		(1,038	)	482,473
Available-for-sale Securities [Member]
Disclosure Regarding Length of Time on Investment Securities with Temporary Impairment	The following tables represent the Company’s disclosure regarding securities available for sale with temporary impairment at March 31, 2015 and December 31, 2014 (in thousands):
		March 31, 2015 Unrealized Losses
		Less than 12 months				12 months or longer					Total
		Fair value		Gross		Fair		Gross			Fair		Gross
				unrealized		value		unrealized			value		unrealized
				losses				losses					losses
	Agency obligations	8,092		(4	)	—		—			8,092		(4	)
	Mortgage-backed securities	97,490		(350	)	54,204		(505	)		151,694		(855	)
	Corporate obligations	995		(8	)	—		—			995		(8	)
		$	106,577	(362	)	54,204		(505	)		160,781		(867	)
		December 31, 2014 Unrealized Losses
		Less than 12 months				12 months or longer						Total
		Fair		Gross		Fair		Gross				Fair		Gross
		value		unrealized		value		unrealized				value		unrealized
				losses				losses						losses
	US Treasury obligations	$	5,937	(3	)	—		—		5,937,000		5,937		(3	)
	Agency obligations	$	24,404	(40	)	5,010		(23	)			29,414		(63	)
	Mortgage-backed securities	55,488		(221	)	206,669		(2,928	)			262,157		(3,149	)
	Corporate obligations	3,466		(15	)	—		—		3,466,000		3,466		(15	)
		$	89,295	(279	)	211,679		(2,951	)			300,974		(3,230	)
Investment Securities Classified by Contractual Maturity	The amortized cost and fair value of securities available for sale at March 31, 2015, 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.
		31-Mar-15
		Amortized		Fair
		cost		value
	Due in one year or less	$	30,687	30,771
	Due after one year through five years	77,505		77,984
	Due after five years through ten years	3,017		3,102
	Due after ten years	2,974		3,050
		$	114,183	114,907
Held-to-maturity Securities [Member]
Disclosure Regarding Length of Time on Investment Securities with Temporary Impairment	The following tables represent the Company’s disclosure on investment securities held to maturity with temporary impairment at March 31, 2015 and December 31, 2014 (in thousands):
		March 31, 2015 Unrealized Losses
		Less than 12 months				12 months or longer					Total
		Fair		Gross		Fair		Gross			Fair		Gross
		value		unrealized		value		unrealized			value		unrealized
				losses				losses					losses
	Agency obligations	$	299	(1	)	1,972		(8	)		2,271		(9	)
	State and municipal obligations	42,209		(470	)	16,422		(463	)		58,631		(933	)
	Corporate obligations	250		—		501		(1	)		751		(1	)
		$	42,758	(471	)	18,895		(472	)		61,653		(943	)
		December 31, 2014 Unrealized Losses
		Less than 12 months				12 months or longer					Total
		Fair		Gross		Fair		Gross			Fair		Gross
		value		unrealized		value		unrealized			value		unrealized
				losses				losses					losses
	Agency obligations	$	3,735	(20	)	—		—			3,735		(20	)
	State and municipal obligations	27,679		(217	)	47,079		(769	)		74,758		(986	)
	Corporate obligations	6,888		(32	)	—		—			6,888		(32	)
		$	38,302	(269	)	47,079		(769	)		85,381		(1,038	)
Investment Securities Classified by Contractual Maturity	The amortized cost and fair value of investment securities in the held to maturity portfolio at March 31, 2015 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.
		31-Mar-15
		Amortized		Fair
		cost		value
	Due in one year or less	$	8,452	8,503
	Due after one year through five years	59,079		60,587
	Due after five years through ten years	186,690		194,565
	Due after ten years	216,972		221,396
		$	471,193	485,051

Loans_Receivable_and_Allowance1

Loans Receivable and Allowance for Loan Losses (Tables)	3 Months Ended
	Mar. 31, 2015
Receivables [Abstract]
Schedule of Summarized Loans Receivable	Loans receivable at March 31, 2015 and December 31, 2014 are summarized as follows (in thousands):
			31-Mar-15				31-Dec-14
	Mortgage loans:
	Residential		$	1,245,711			1,251,445
	Commercial		1,688,083				1,694,359
	Multi-family		1,070,294				1,041,582
	Construction		274,001				221,102
	Total mortgage loans		4,278,089				4,208,488
	Commercial loans		1,242,565				1,262,422
	Consumer loans		601,190				611,467
	Total gross loans		6,121,844				6,082,377
	Purchased credit-impaired ("PCI") loans		4,285				4,510
	Premiums on purchased loans		5,386				5,307
	Unearned discounts		(47		)		(53	)
	Net deferred fees		(6,769		)		(6,636	)
	Total loans		$	6,124,699			6,085,505
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):
			31-Mar-15
			30-59				60-89		Non-accrual		Total Past			Current			Total Loans			Recorded
			Days				Days				Due and						Receivable			Investment
											Non-accrual									> 90 days
																				accruing
	Mortgage loans:
	Residential		$	8,871			5,832		16,913		31,616			1,214,095			1,245,711			—
	Commercial		1,485				292		18,203		19,980			1,668,103			1,688,083			—
	Multi-family		526				—		322		848			1,069,446			1,070,294			—
	Construction		—				—		—		—			274,001			274,001			—
	Total mortgage loans		10,882				6,124		35,438		52,444			4,225,645			4,278,089			—
	Commercial loans		3,352				18		12,035		15,405			1,227,160			1,242,565			—
	Consumer loans		3,599				1,020		3,415		8,034			593,156			601,190			—
	Total gross loans		$	17,833			7,162		50,888		75,883			6,045,961			6,121,844			—
			31-Dec-14
			30-59				60-89		Non-accrual		Total Past			Current			Total Loans			Recorded
			Days				Days				Due and						Receivable			Investment
											Non-accrual									> 90 days
																				accruing
	Mortgage loans:
	Residential		$	10,121			4,331		17,222		31,674			1,219,771			1,251,445			—
	Commercial		146				30		20,026		20,202			1,674,157			1,694,359			—
	Multi-family		—				—		321		321			1,041,261			1,041,582			—
	Construction		—				—		—		—			221,102			221,102			—
	Total mortgage loans		10,267				4,361		37,569		52,197			4,156,291			4,208,488			—
	Commercial loans		1,000				371		12,342		13,713			1,248,709			1,262,422			—
	Consumer loans		2,398				2,509		3,944		8,851			602,616			611,467			—
	Total gross loans		$	13,665			7,241		53,855		74,761			6,007,616			6,082,377			—
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):
			31-Mar-15
			Mortgage				Commercial		Consumer		Total Portfolio
			loans				loans		loans		Segments
	Individually evaluated for impairment		$	65,563			22,849		2,396		90,808
	Collectively evaluated for impairment		4,212,526				1,219,716		598,794		6,031,036
	Total		$	4,278,089			1,242,565		601,190		6,121,844
			31-Dec-14
			Mortgage				Commercial		Consumer		Total Portfolio
			loans				loans		loans		Segments
	Individually evaluated for impairment		$	66,548			16,463		2,384		85,395
	Collectively evaluated for impairment		4,141,940				1,245,959		609,083		5,996,982
	Total		$	4,208,488			1,262,422		611,467		6,082,377
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):
			31-Mar-15
			Mortgage				Commercial		Consumer		Total Portfolio			Unallocated			Total
			loans				loans		loans		Segments
	Individually evaluated for impairment		$	4,896			1,648		109		6,653			—			6,653
	Collectively evaluated for impairment		27,990				22,049		4,168		54,207			250			54,457
	Total		$	32,886			23,697		4,277		60,860			250			61,110
			31-Dec-14
			Mortgage				Commercial		Consumer		Total Portfolio			Unallocated			Total
			loans				loans		loans		Segments
	Individually evaluated for impairment		$	4,696			2,318		113		7,127			—			7,127
	Collectively evaluated for impairment		27,281				22,063		4,768		54,112			495			54,607
			$	31,977			24,381		4,881		61,239			495			61,734
Schedule of Troubled Debt Restructuring	The following tables present the number of loans modified as TDRs during the three months ended March 31, 2015 and 2014 along with their balances immediately prior to the modification date and post-modification as of March 31, 2015 and 2014:
			For the three months ended
			31-Mar-15									31-Mar-14
	Troubled Debt Restructuring		Number  of			Pre-Modification			Post-Modification			Number  of			Pre-Modification				Post-Modification
			Loans			Outstanding			Outstanding			Loans			Outstanding				Outstanding
						Recorded			Recorded  Investment						Recorded  Investment				Recorded  Investment
						Investment
			($ in thousands)
	Mortgage loans:
	Residential		2			$	322		$	321		4			$	875			$	835
	Construction		1			2,600			347			—			—				—
	Total mortgage loans		3			2,922			668			4			875				835
	Commercial loans		4			6,659			6,898			1			116				28
	Consumer loans		1			44			42			—			—				—
	Total restructured loans		8			$	9,625		$	7,608		5			$	991			$	863
Schedule of Troubled Debt Restructurings Subsequently Defaulted	The following table presents loans modified as TDRs within the previous 12 months from March 31, 2015 and 2014, and for which there was a payment default (90 days or more past due) at the quarter ended March 31, 2015 and 2014.
			March 31, 2015							March 31, 2014
	Troubled Debt Restructurings Subsequently Defaulted		Number of				Outstanding			Number of		Outstanding
			Loans				Recorded  Investment			Loans		Recorded  Investment
							($ in thousands)					($ in thousands)
	Mortgage loans:
	Residential		$	—			$	—		1		$	90
	Total mortgage loans		—				—			1		90
	Commercial loans		—				—			3		$	1,647
	Total restructured loans		$	—			$	—		4		$	1,737
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 months ended March 31, 2015 (in thousands):
		Three months ended March 31, 2015
	Beginning balance	$	695
	Acquisition	—
	Accretion	(198		)
	Reclassification from non-accretable discount	184
	Ending balance	$	681
	The following table presents information regarding the estimates of the contractually required payments, the cash flows expected to be collected and the estimated fair value of the PCI loans acquired from Team Capital at May 30, 2014 (in thousands):
			30-May-14
	Contractually required principal and interest		$	12,505
	Contractual cash flows not expected to be collected (non-accretable discount)		(6,475		)
	Expected cash flows to be collected at acquisition		6,030
	Interest component of expected cash flows (accretable yield)		(810		)
	Fair value of acquired PCI loans		$	5,220
Schedule of Allowance for Loan Losses by Portfolio Segment	The activity in the allowance for loan losses by portfolio segment for the three months ended March 31, 2015 and 2014 was as follows (in thousands):
	Three months ended March 31,		Mortgage				Commercial		Consumer		Total Portfolio			Unallocated			Total
			loans				loans		loans		Segments
	2015
	Balance at beginning of period		$	31,977			24,381		4,881		61,239			495			61,734
	Provision charged to operations		1,038				(477	)	284		845			(245	)		600
	Recoveries of loans previously charged-off		65				215		211		491			—			491
	Loans charged-off		(194		)		(422	)	(1,099	)	(1,715	)		—			(1,715	)
	Balance at end of period		$	32,886			23,697		4,277		60,860			250			61,110
	2014
	Balance at beginning of period		$	34,144			24,107		4,929		63,180			1,484			64,664
	Provision charged to operations		(2,000		)		1,330		144		(526	)		926			400
	Recoveries of loans previously charged-off		67				243		121		431			—			431
	Loans charged-off		(741		)		(519	)	(815	)	(2,075	)		—			(2,075	)
	Balance at end of period		$	31,470			25,161		4,379		61,010			2,410			63,420
Summary of Impaired Loans Receivable by Class	The following table presents loans individually evaluated for impairment by portfolio segment and class, excluding PCI loans (in thousands):
			31-Mar-15														31-Dec-14
			Unpaid				Recorded		Related		Average			Interest			Unpaid			Recorded	Related	Average	Interest
			Principal				Investment		Allowance		Recorded			Income			Principal			Investment	Allowance	Recorded	Income
			Balance								Investment			Recognized			Balance					Investment	Recognized
	Loans with no related allowance
	Mortgage loans:
	Residential		$	15,230			10,895		—		11,048			107			14,942			10,629	—	11,138	357
	Commercial		2,613				2,574		—		2,574			—			4,971			4,708	—	4,713	—
	Multi-family		—				—		—		—			—			—			—	—	—	—
	Construction		—				—		—		—			—			—			—	—	—	—
	Total		17,843				13,469		—		13,622			107			19,913			15,337	—	15,851	357
	Commercial loans		8,925				8,387		—		8,501			60			2,718			2,179	—	1,823	4
	Consumer loans		1,302				854		—		862			8			1,250			830	—	870	28
	Total loans		$	28,070			22,710		—		22,985			175			23,881			18,346	—	18,544	389
	Loans with an allowance recorded
	Mortgage loans:
	Residential		$	15,444			14,824		2,382		14,864			386			15,523			14,906	2,367	15,106	555
	Commercial		38,382				36,923		2,504		37,021			239			37,555			36,306	2,329	36,674	914
	Multi-family		—				—		—		—			—			—			—	—	—	—
	Construction		347				347		10		347			14			—			—	—	—	—
	Total		54,173				52,094		4,896		52,232			639			53,078			51,212	4,696	51,780	1,469
	Commercial loans		16,257				14,462		1,648		14,673			75			15,990			14,283	2,318	15,967	390
	Consumer loans		1,552				1,542		109		1,548			19			1,565			1,554	113	1,578	80
	Total loans		$	71,982			68,098		6,653		68,453			733			70,633			67,049	7,127	69,325	1,939
	Total impaired loans
	Mortgage loans:
	Residential		$	30,674			25,719		2,382		25,912			493			30,465			25,535	2,367	26,244	912
	Commercial		40,995				39,497		2,504		39,595			239			42,526			41,014	2,329	41,387	914
	Multi-family		—				—		—		—			—			—			—	—	—	—
	Construction		347				347		10		347			14			—			—	—	—	—
	Total		72,016				65,563		4,896		65,854			746			72,991			66,549	4,696	67,631	1,826
	Commercial loans		25,182				22,849		1,648		23,174			135			18,708			16,462	2,318	17,790	394
	Consumer loans		2,854				2,396		109		2,410			27			2,815			2,384	113	2,448	108
	Total loans		$	100,052			90,808		6,653		91,438			908			94,514			85,395	7,127	87,869	2,328
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 March 31, 2015
			Residential				Commercial		Multi-		Construction			Total			Commercial			Consumer	Total loans
							mortgage		family					mortgages
	Special mention		$	5,832			43,749		1,105		—			50,686			57,403			1,020	109,109
	Substandard		16,913				30,773		847		347			48,880			32,410			3,165	84,455
	Doubtful		—				1,061		—		—			1,061			28			—	1,089
	Loss		—				—		—		—			—			—			—	—
	Total classified and criticized		22,745				75,583		1,952		347			100,627			89,841			4,185	194,653
	Pass/Watch		1,222,966				1,612,500		1,068,342		273,654			4,177,462			1,152,724			597,005	5,927,191
	Total		$	1,245,711			1,688,083		1,070,294		274,001			4,278,089			1,242,565			601,190	6,121,844
			At December 31, 2014
			Residential				Commercial		Multi-		Construction			Total			Commercial			Consumer	Total loans
							mortgage		family					mortgages
	Special mention		$	4,331			18,414		851		—			23,596			45,599			2,509	71,704
	Substandard		17,222				53,454		322		2,600			73,598			32,828			3,938	110,364
	Doubtful		—				1,063		—		—			1,063			29			—	1,092
	Loss		—				—		—		—			—			—			—	—
	Total classified and criticized		21,553				72,931		1,173		2,600			98,257			78,456			6,447	183,160
	Pass/Watch		1,229,892				1,621,428		1,040,409		218,502			4,110,231			1,183,966			605,020	5,899,217
	Total		$	1,251,445			1,694,359		1,041,582		221,102			4,208,488			1,262,422			611,467	6,082,377

Deposits_Tables

Deposits (Tables)	3 Months Ended
	Mar. 31, 2015
Banking and Thrift [Abstract]
Schedule of Deposits	Deposits at March 31, 2015 and December 31, 2014 are summarized as follows (in thousands):
		31-Mar-15		31-Dec-14
	Savings	$	985,464	995,347
	Money market	1,501,964		1,496,466
	NOW	1,454,504		1,425,424
	Non-interest bearing	1,075,197		1,049,597
	Certificates of deposit	805,922		825,689
	Total	$	5,823,051	5,792,523

Components_of_Net_Periodic_Ben1

Components of Net Periodic Benefit Cost (Tables)	3 Months Ended
	Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Net Periodic Benefit Cost (Increase)	Net periodic benefit (increase) cost for pension benefits and other post-retirement benefits for the three months ended March 31, 2015 and 2014 included the following components (in thousands):
		Three months ended March 31,
		Pension					Other post-
		benefits					retirement
							benefits
		2015			2014		2015	2014
	Service cost	$	—		—		42	42
	Interest cost	284			352		281	272
	Expected return on plan assets	(633		)	(894	)	—	—
	Amortization of prior service cost	—			—		—	(1	)
	Amortization of the net loss	194			93		—	(51	)
	Net periodic benefit (increase) cost	$	(155	)	(449	)	323	262

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2015
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 March 31, 2015 and December 31, 2014, by level within the fair value hierarchy:
		Fair Value Measurements at Reporting Date Using:
	(Dollars in thousands)	31-Mar-15		Quoted Prices in		Significant Other			Significant
				Active  Markets for		Observable  Inputs			Unobservable
				Identical Assets		(Level 2)			Inputs (Level 3)
				(Level 1)
	Measured on a recurring basis:
	Securities available for sale:
	US Treasury obligations	$	8,071	8,071		—			—
	Agency obligations	95,157		95,157		—			—
	Mortgage-backed securities	932,113		—		932,113			—
	State and municipal obligations	6,083		—		6,083			—
	Corporate obligations	5,596		—		5,596			—
	Equity securities	539		539		—			—
	Total securities available for sale	1,047,559		103,767		943,792			—
	Asset derivatives	3,216		—		3,216			—
		$	1,050,775	103,767		947,008			—
	Liability derivatives	$	3,285	—		3,285			—
	Measured on a non-recurring basis:
	Loans measured for impairment based on the fair value of the underlying collateral	$	23,010	—		—			23,010
	Foreclosed assets	5,924		—		—			5,924
		$	28,934	—		—			28,934
		Fair Value Measurements at Reporting Date Using:
	(Dollars in thousands)	31-Dec-14		Quoted Prices in			Significant Other			Significant
				Active  Markets for			Observable  Inputs			Unobservable
				Identical Assets			(Level 2)			Inputs (Level 3)
				(Level 1)
	Measured on a recurring basis:
	Securities available for sale:
	US Treasury obligations	$	8,016	8,016			—			—
	Agency obligations	95,076		95,076			—			—
	Mortgage-backed securities	957,257		—			957,257			—
	State and municipal obligations	7,002		—			7,002			—
	Equity securities	524		524			—			—
		1,074,395		103,616			970,779			—
	Asset derivatives	2,046		—			2,046
		$	1,076,441	$	103,616		$	972,825		$	—
	Liability derivatives	$	2,052				2,052
	Measured on a non-recurring basis:
	Loans measured for impairment based on the fair value of the underlying collateral	$	23,086	—			—			23,086
	Foreclosed assets	5,098		—			—			5,098
		$	28,184	—			—			28,184
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 March 31, 2015 and December 31, 2014. Fair values are presented by level within the fair value hierarchy.
				Fair Value Measurements at March 31, 2015 Using:
	(Dollars in thousands)	Carrying		Fair		Quoted Prices in			Significant  Other			Significant
		value		value		Active  Markets for			Observable  Inputs			Unobservable
						Identical Assets			(Level 2)			Inputs (Level 3)
						(Level 1)
	Financial assets:
	Cash and cash equivalents	$	90,874	90,874		90,874			—			—
	Securities available for sale:
	US Treasury obligations	8,071		8,071		8,071			—			—
	Agency obligations	95,157		95,157		95,157			—			—
	Mortgage-backed securities	932,113		932,113		—			932,113			—
	State and municipal obligations	6,083		6,083		—			6,083			—
	Corporate obligations	5,596		5,596		—			5,596			—
	Equity securities	539		539		539			—			—
	Total securities available for sale	$	1,047,559	1,047,559		103,767			943,792			—
	Investment securities held to maturity:
	Agency obligations	7,131		7,143		7,143			—			—
	Mortgage-backed securities	2,511		2,620		—			2,620			—
	State and municipal obligations	453,339		467,121		—			467,121			—
	Corporate obligations	10,723		10,787		—			10,787			—
	Total securities held to maturity	$	473,704	487,671		7,143			480,528			—
	FHLB-NY stock	67,455		67,455		67,455			—			—
	Loans, net of allowance for loan losses	6,063,589		6,165,229		—			—			6,165,229
	Asset derivative	3,216		3,216		—			3,216			—
	Financial liabilities:
	Deposits other than certificates of deposits	$	5,017,129	5,017,129		5,017,129			—			—
	Certificates of deposit	805,922		809,036		—			809,036			—
	Total deposits	5,823,051		5,826,165		5,017,129			809,036			—
	Borrowings	1,468,404		1,489,209		—			1,489,209			—
	Liability derivative	3,285		3,285		—			3,285	845,000		—
				Fair Value Measurements at December 31, 2014 Using:
	(Dollars in thousands)	Carrying		Fair		Quoted Prices in			Significant  Other		Significant
		value		value		Active  Markets for			Observable  Inputs		Unobservable
						Identical Assets			(Level 2)		Inputs (Level 3)
						(Level 1)
	Financial assets:
	Cash and cash equivalents	$	103,762	103,762		103,762			—		—
	Securities available for sale:
	US Treasury obligations	8,016		8,016		8,016			—		—
	Agency obligations	95,076		95,076		95,076			—		—
	Mortgage-backed securities	957,257		957,257		—			957,257		—
	State and municipal obligations	7,002		7,002		—			7,002		—
	Corporate obligations	6,520		6,520		—			6,520		—
	Equity securities	524		524		524			—		—
	Total securities available for sale	$	1,074,395	1,074,395		103,616			970,779		—
	Investment securities held to maturity:
	Agency obligations	$	6,813	6,810		6,810			—		—
	Mortgage-backed securities	2,816		2,939		—			2,939		—
	State and municipal obligations	449,410		462,238		—			462,238		—
	Corporate obligations	10,489		10,486		—			10,486		—
	Total securities held to maturity	$	469,528	482,473		6,810			475,663		—
	FHLB-NY stock	69,789		69,789		69,789			—		—
	Loans, net of allowance for loan losses	6,023,771		6,104,558		—			—		6,104,558
	Asset derivative	2,046		2,046					2,046
	Financial liabilities:
	Deposits other than certificates of deposits	$	4,966,834	4,966,834		4,966,834			—		—
	Certificates of deposit	825,689		830,233		—			830,233		—
	Total deposits	$	5,792,523	5,797,067		4,966,834			830,233		—
	Borrowings	1,509,851		1,516,966		—			1,516,966		—
	Liability derivative	2,052		2,052					2,052

Other_Comprehensive_Income_Los1

Other Comprehensive Income (Loss) (Tables)	3 Months Ended
	Mar. 31, 2015
Equity [Abstract]
Components of Other Comprehensive Income (Loss)	The following table presents the components of other comprehensive income both gross and net of tax, for the three months ended March 31, 2015 and 2014 (in thousands):
			Three months ended March 31,
			2015								2014
			Before			Tax			After		Before		Tax		After
			Tax			Effect			Tax		Tax		Effect		Tax
	Components of Other Comprehensive Income:
	Unrealized gains and losses on securities available for sale:
	Net gains arising during the period		$	6,202		(2,491	)		3,711		6,287		(2,568	)	3,719
	Reclassification adjustment for (gains) losses included in net income		(2		)	1			(1	)	350		(143	)	207
	Total		6,200			(2,490	)		3,710		6,637		(2,711	)	3,926
	Amortization related to post-retirement obligations		(7		)	3			(4	)	(81	)	33		(48	)
	Total other comprehensive income		$	6,193		(2,487	)		3,706		6,556		(2,678	)	3,878
Components of Accumulated Other Comprehensive Income, Net of Tax	The following tables present the changes in the components of accumulated other comprehensive income, net of tax, for the three months ended March 31, 2015 and 2014 (in thousands):
			Changes in Accumulated Other Comprehensive Income by Component, net of tax
			For the three months ended March 31,
			2015								2014
			Unrealized			Post  Retirement			Accumulated		Unrealized		Post  Retirement		Accumulated
			Gains on Securities			Obligations			Other		Gains on Securities		Obligations		Other
			Available for						Comprehensive		Available for				Comprehensive
			Sale						Income		Sale				Income
	Balance at December 31,		$	7,743		(7,714	)		29		(2,799	)	(2,052	)	(4,851	)
	Current period change in other comprehensive income (loss)		3,710			(4	)		3,706		3,926		(48	)	3,878
	Balance at March 31,		$	11,453		(7,718	)		3,735		1,127		(2,100	)	(973	)
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 months ended March 31, 2015 and 2014 (in thousands):
			Reclassifications Out of Accumulated Other Comprehensive
			Income ("AOCI")
			Amount reclassified from AOCI for the three months ended March 31,							Affected line item in the Consolidated
			2015			2014				Statement of Income
	Details of AOCI:
	Securities available for sale:
	Realized net gains on the sale of securities available for sale		$	2		$	(350	)		Net gain on securities transactions
			(1		)	143				Income tax expense
			1			(207		)		Net of tax
	Post retirement obligations:
	Amortization of actuarial losses (gains)		194			42				Compensation and employee benefits (1)
			(79		)	(17		)		Income tax expense
			115			25				Net of tax
	Total reclassifications		$	116		$	(182	)		Net of tax
	-1	This item is included in the computation of net periodic benefit cost. See Note 6. Components of Net Periodic Benefit Cost.

Derivatives_and_Hedging_Activi1

Derivatives and Hedging Activities (Tables)	3 Months Ended
	Mar. 31, 2015
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 as of March 31, 2015 and December 31, 2014 (in thousands):
		As of March 31, 2015
		Asset Derivatives				Liability Derivatives
		Consolidated Statements of Financial Condition	Fair			Consolidated Statements of Financial Condition	Fair
			Value				Value
	Derivatives not designated as a hedging instruments:
	Interest rate products	Other assets	$	3,208		Other liabilities	$	3,285
	Credit contracts	Other assets	8				—
	Total derivatives not designated as hedging instruments		$	3,216			$	3,285
		As of December 31, 2014
		Asset Derivatives				Liability Derivatives
		Consolidated Statements of Financial Condition	Fair			Consolidated Statements of Financial Condition	Fair
			Value				Value
	Derivatives not designated as a hedging instruments:
	Interest rate products	Other assets	$	2,040		Other liabilities	$	2,052
	Credit contracts	Other assets	6				—
	Total derivatives not designated as hedging instruments		$	2,046			$	2,052
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 for the quarter ended March 31, 2015 (in thousands).
			Gain (loss) recognized in Income on derivatives
		Consolidated Statements of Income	Three months ended March 31, 2015
	Derivatives not designated as a hedging instruments:
	Interest rate products	Other income	$	(65	)
	Credit contracts	Other income	1
	Total		$	(64	)

Summary_of_Significant_Account3

Summary of Significant Accounting Policies (Narrative) (Detail)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Accounting Policies [Abstract]
Anti-dilutive stock options and awards excluded from computation of earnings per share	818,059	838,801

Summary_of_Significant_Account4

Summary of Significant Accounting Policies (Reconciliation of Numerators and Denominators of Basic and Diluted Earnings Per Share Calculations) (Detail) (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Accounting Policies [Abstract]
Net income	$19,802	$17,029
Income available to common stockholders, Basic	19,802	17,029
Income available to common stockholders, Diluted	$19,802	$17,029
Weighted average basic shares outstanding, Basic	62,673,887	57,369,039
Weighted average basic shares outstanding, Diluted	167,064	159,380
Weighted average common shares outstanding, Diluted	62,840,951	57,528,419
Income available to common stockholders, per share amount, Basic	$0.32	$0.30
Income available to common stockholders, per share amount, Diluted	$0.32	$0.30

Business_Combinations_Narrativ

Business Combinations (Narrative) (Details) (Team Capital Bank [Member], USD $)	0 Months Ended
Share data in Millions, unless otherwise specified	30-May-14	30-May-14
Business Acquisition [Line Items]
Total assets	$963,974,000	$963,974,000
Loans	631,209,000	631,209,000
Deposits	769,936,000	769,936,000
Total consideration paid	115,100,000
Cash paid	31,600,000
Equity interests issued as consideration	$83,500,000
COMMON STOCK
Business Acquisition [Line Items]
Shares issued as consideration (in shares)	4.9

Business_Combinations_Assets_A

Business Combinations (Assets Acquired and Liabilities Assumed) (Details) (Team Capital Bank [Member], USD $)	30-May-14
In Thousands, unless otherwise specified
Team Capital Bank [Member]
Assets acquired:
Cash and cash equivalents, net	$68,650
Securities available for sale	157,635
Loans	631,209
Bank-owned life insurance	22,319
Banking premises and equipment	24,778
Accrued interest receivable	3,060
Goodwill	40,354
Other intangibles assets	9,868
Foreclosed assets, net	653
Other assets	5,448
Total assets acquired	963,974
Liabilities assumed:
Deposits	769,936
Borrowed Funds	112,835
Other liabilities	-2,314
Total liabilities assumed	880,457
Net assets acquired	$83,517

Investment_Securities_Narrativ

Investment Securities (Narrative) (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
	security		position
	position		security
Schedule of Held-to-maturity Securities [Line Items]
Securities available for sale, at fair value	$1,047,559,000		$1,074,395,000
Investment securities held to maturity	473,704,000		469,528,000
Total number of all held to maturity and available for sale securities in an unrealized loss position	131		206
Other-than-temporary impairment charges, net	0
Amortized cost	1,028,428,000		1,061,461,000
Proceeds from the sale of securities available for sale	0	6,085,000
Gross gains		365,000
Recognized gain on calls of securities	2,000
Gross losses		0
Proceeds from calls on securities available for sale	465,000	740,000
Gross gains	2,000
Loss on the sale of a previously impaired non-agency mortgage-backed security		365,000
Previously incurred cumulative credit losses		1,500,000
Number of securities in an unrealized loss position	21		43
Proceeds from calls on securities available for sale		4,073,000
Recognized gain on calls of securities held to maturity portfolio		13,000
Proceeds from the calls		6,395,000
Proceeds from sale of securities held to maturity portfolio	0	0
Fair value	487,671,000		482,473,000
Number of securities in an unrealized loss position	110		163
Available-for-sale Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Gross losses	0	0
Private Label Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	3,003,000
Number of securities in an unrealized loss position	4
Unrealized losses	21,000
Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Investment securities held to maturity	2,500
Fair value	$2,600

Investment_Securities_Securiti

Investment Securities (Securities Available for Sale) (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$1,028,428	$1,061,461
Gross unrealized gains	19,998	16,164
Gross unrealized losses	-867	-3,230
Fair value	1,047,559	1,074,395
US Treasury Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	8,013	8,016
Gross unrealized gains	58	3
Gross unrealized losses	0	-3
Fair value	8,071	8,016
Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	94,719	94,871
Gross unrealized gains	442	268
Gross unrealized losses	-4	-63
Fair value	95,157	95,076
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	913,848	944,796
Gross unrealized gains	19,120	15,610
Gross unrealized losses	-855	-3,149
Fair value	932,113	957,257
State and Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	5,934	6,855
Gross unrealized gains	149	147
Gross unrealized losses	0	0
Fair value	6,083	7,002
Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	5,517	6,526
Gross unrealized gains	87	9
Gross unrealized losses	-8	-15
Fair value	5,596	6,520
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	397	397
Gross unrealized gains	142	127
Gross unrealized losses	0	0
Fair value	$539	$524

Investment_Securities_Investme

Investment Securities (Investment Securities Available for Sale by Contractual Maturity) (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$1,028,428	$1,061,461
Securities available for sale, at fair value	1,047,559	1,074,395
Available-for-sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Due in one year or less, Amortized cost	30,687
Due after one year through five years, Amortized cost	77,505
Due after five years through ten years, Amortized cost	3,017
Due after ten years, Amortized cost	2,974
Amortized cost	114,183
Due after one year through five years, Fair value	77,984
Due in one year or less, Fair value	30,771
Due after ten years , Fair value	3,050
Securities available for sale, at fair value	114,907
Due after five years through ten years, Fair value	$3,102

Investment_Securities_RollForw

Investment Securities (Roll-Forward of Credit Loss Component of Other-than Temporary Impairment) (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Beginning credit loss amount	$0	$1,674
Add: Initial OTTI credit losses	0	0
Subsequent OTTI credit losses	0	0
Less: Realized losses for securities sold	0	1,540
Securities intended or required to be sold	0	0
Increases in expected cash flows on debt securities	0	0
Ending credit loss amount	$0	$134

Investment_Securities_Disclosu

Investment Securities (Disclosure Regarding Length of Time on Securities Available for Sale with Temporary Impairment) (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair value	$106,577	$89,295
Less than 12 months, Gross unrealized losses	-362	-279
12 months or longer, Fair value	54,204	211,679
12 months or longer, Gross unrealized losses	-505	-2,951
Total, Fair value	160,781	300,974
Total, Gross unrealized losses	-867	-3,230
US Treasury Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair value		5,937
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		5,937
Total, Gross unrealized losses	0	-3
Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair value	8,092	24,404
Less than 12 months, Gross unrealized losses	-4	-40
12 months or longer, Fair value	0	5,010
12 months or longer, Gross unrealized losses	0	-23
Total, Fair value	8,092	29,414
Total, Gross unrealized losses	-4	-63
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair value	97,490	55,488
Less than 12 months, Gross unrealized losses	-350	-221
12 months or longer, Fair value	54,204	206,669
12 months or longer, Gross unrealized losses	-505	-2,928
Total, Fair value	151,694	262,157
Total, Gross unrealized losses	-855	-3,149
Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair value	995	3,466
Less than 12 months, Gross unrealized losses	-8	-15
12 months or longer, Fair value	0	0
12 months or longer, Gross unrealized losses	0	0
Total, Fair value	995	3,466
Total, Gross unrealized losses	($8)	($15)

Investment_Securities_Investme1

Investment Securities (Investment Securities Held to Maturity) (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	$473,704,000	$469,528,000
Gross unrealized gains	14,910,000	13,983,000
Gross unrealized losses	-943,000	-1,038,000
Fair value	487,671,000	482,473,000
Agency Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	7,131,000	6,813,000
Gross unrealized gains	21,000	17,000
Gross unrealized losses	-9,000	-20,000
Fair value	7,143,000	6,810,000
Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	2,511,000	2,816,000
Gross unrealized gains	109,000	123,000
Gross unrealized losses	0	0
Fair value	2,620,000	2,939,000
State and Municipal Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	453,339,000	449,410,000
Gross unrealized gains	14,715,000	13,814,000
Gross unrealized losses	-933,000	-986,000
Fair value	467,121,000	462,238,000
Corporate Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	10,723,000	10,489,000
Gross unrealized gains	65,000	29,000
Gross unrealized losses	-1,000	-32,000
Fair value	$10,787,000	$10,486,000

Investment_Securities_Securiti1

Investment Securities (Securities Held to Maturity by Contractual Maturity) (Detail) (USD $)	Mar. 31, 2015
In Thousands, unless otherwise specified
Investments, Debt and Equity Securities [Abstract]
Due in one year or less, Amortized cost	$8,452
Due after one year through five years, Amortized cost	59,079
Due after five years through ten years, Amortized cost	186,690
Due after ten years, Amortized cost	216,972
Amortized cost	471,193
Due in one year or less, Fair value	8,503
Due after one year through five years, Fair value	60,587
Due after five years through ten years, Fair value	194,565
Due after ten years, Fair value	221,396
Fair value	$485,051

Investment_Securities_Disclosu1

Investment Securities (Disclosure Regarding Length of Time on Investment Securities with Temporary Impairment) (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, Fair Value	$42,758	$38,302
Less than 12 months, Gross unrealized losses	-471	-269
12 months or longer, Fair value	18,895	47,079
12 months or longer, Gross unrealized losses	-472	-769
Total, Fair value	61,653	85,381
Total, Gross unrealized losses	-943	-1,038
Agency Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, Fair Value	299	3,735
Less than 12 months, Gross unrealized losses	-1	-20
12 months or longer, Fair value	1,972	0
12 months or longer, Gross unrealized losses	-8	0
Total, Fair value	2,271	3,735
Total, Gross unrealized losses	-9	-20
State and Municipal Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, Fair Value	42,209	27,679
Less than 12 months, Gross unrealized losses	-470	-217
12 months or longer, Fair value	16,422	47,079
12 months or longer, Gross unrealized losses	-463	-769
Total, Fair value	58,631	74,758
Total, Gross unrealized losses	-933	-986
Corporate Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, Fair Value	250	6,888
Less than 12 months, Gross unrealized losses	0	-32
12 months or longer, Fair value	501	0
12 months or longer, Gross unrealized losses	-1	0
Total, Fair value	751	6,888
Total, Gross unrealized losses	($1)	($32)

Loans_Receivable_and_Allowance2

Loans Receivable and Allowance for Loan Losses (Narrative) (Detail) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	30-May-14
	Borrowers		Borrowers
	SecurityLoan		SecurityLoan
	TDRs		TDRs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Principal amount of nonaccrual loans	$50,900,000		$53,900,000
Loans less than 90 days past due	7,300,000		8,400,000
Impaired loan defined floor limit	1,000,000
Impaired loans number	153		147
Impaired loans	90,808,000		85,395,000
Number of troubled debt restructurings	131		123
Number of borrowers	123		120
Loans and leases receivable, impaired, nonperforming, accrual of interest	61,700,000		54,800,000
Weighted average modified interest rate	5.90%	4.31%
Weighted average prior modification rate	5.83%	5.23%
Interest and Dividend Income, Operating	72,231,000	64,523,000
Allowances for loan losses	6,653,000		7,127,000
Average balance of impaired loans	91,438,000	87,869,000
Team Capital Bank [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses, Decreases	225,000
Fair value of acquired PCI loans				5,220,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	4,300,000			4,500,000
Interest and Dividend Income, Operating	76,000
Impaired Loans - Trouble Debt Restructurings [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Allowances for loan losses	31,000	41,000
No Allowance for Loan Losses Required [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired financing receivable with no related allowance	22,710,000		18,346,000
With Related Allowance For Loan Losses [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Allowances for loan losses	$6,653,000		$7,127,000

Loans_Receivable_and_Allowance3

Loans Receivable and Allowance for Loan Losses (Schedule of Summarized Loans Receivable) (Detail) (USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Servicing Liability at Amortized Cost [Line Items]
Loans and Leases Receivable, Gross	$6,121,844	$6,082,377
Purchased credit-impaired (PCI) loans	4,285	4,510
Premiums on purchased loans	5,386	5,307
Unearned discounts	-47	-53
Net deferred fees	-6,769	-6,636
Total loans	6,124,699	6,085,505
Commercial Loan [Member]
Servicing Liability at Amortized Cost [Line Items]
Loans and Leases Receivable, Gross	1,242,565	1,262,422
Consumer Loans [Member]
Servicing Liability at Amortized Cost [Line Items]
Loans and Leases Receivable, Gross	601,190	611,467
Mortgage Loans [Member]
Servicing Liability at Amortized Cost [Line Items]
Loans and Leases Receivable, Gross	4,278,089	4,208,488
Mortgage Loans [Member] | Residential [Member]
Servicing Liability at Amortized Cost [Line Items]
Loans and Leases Receivable, Gross	1,245,711	1,251,445
Mortgage Loans [Member] | Commercial [Member]
Servicing Liability at Amortized Cost [Line Items]
Loans and Leases Receivable, Gross	1,688,083	1,694,359
Mortgage Loans [Member] | Multi-Family [Member]
Servicing Liability at Amortized Cost [Line Items]
Loans and Leases Receivable, Gross	1,070,294	1,041,582
Mortgage Loans [Member] | Construction [Member]
Servicing Liability at Amortized Cost [Line Items]
Loans and Leases Receivable, Gross	$274,001	$221,102

Loans_Receivable_and_Allowance4

Loans Receivable and Allowance for Loan Losses (Summary of Aging Loans Receivable by Portfolio Segment and Class) (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days	$17,833	$13,665
60-89 Days	7,162	7,241
Non-accrual	50,888	53,855
Total Past Due and Non-accrual	75,883	74,761
Current	6,045,961	6,007,616
Loans and Leases Receivable, Gross	6,121,844	6,082,377
Total Loans Receivable	6,121,844	6,082,377
Recorded Investment 90 days accruing	0	0
Commercial Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days	3,352	1,000
60-89 Days	18	371
Non-accrual	12,035	12,342
Total Past Due and Non-accrual	15,405	13,713
Current	1,227,160	1,248,709
Loans and Leases Receivable, Gross	1,242,565	1,262,422
Total Loans Receivable	1,242,565	1,262,422
Recorded Investment 90 days accruing	0	0
Consumer Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days	3,599	2,398
60-89 Days	1,020	2,509
Non-accrual	3,415	3,944
Total Past Due and Non-accrual	8,034	8,851
Current	593,156	602,616
Loans and Leases Receivable, Gross	601,190	611,467
Total Loans Receivable		611,467
Recorded Investment 90 days accruing	0	0
Mortgage Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days	10,882	10,267
60-89 Days	6,124	4,361
Non-accrual	35,438	37,569
Total Past Due and Non-accrual	52,444	52,197
Current	4,225,645	4,156,291
Loans and Leases Receivable, Gross	4,278,089	4,208,488
Total Loans Receivable	4,278,089	4,208,488
Recorded Investment 90 days accruing	0	0
Mortgage Loans [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days	8,871	10,121
60-89 Days	5,832	4,331
Non-accrual	16,913	17,222
Total Past Due and Non-accrual	31,616	31,674
Current	1,214,095	1,219,771
Loans and Leases Receivable, Gross	1,245,711	1,251,445
Total Loans Receivable		1,251,445
Recorded Investment 90 days accruing	0	0
Mortgage Loans [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days	1,485	146
60-89 Days	292	30
Non-accrual	18,203	20,026
Total Past Due and Non-accrual	19,980	20,202
Current	1,668,103	1,674,157
Loans and Leases Receivable, Gross	1,688,083	1,694,359
Total Loans Receivable		1,694,359
Recorded Investment 90 days accruing	0	0
Mortgage Loans [Member] | Multi-Family [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days	526	0
60-89 Days	0	0
Non-accrual	322	321
Total Past Due and Non-accrual	848	321
Current	1,069,446	1,041,261
Loans and Leases Receivable, Gross	1,070,294	1,041,582
Total Loans Receivable		1,041,582
Recorded Investment 90 days accruing	0	0
Mortgage Loans [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days	0	0
60-89 Days	0	0
Non-accrual	0	0
Total Past Due and Non-accrual	0	0
Current	274,001	221,102
Loans and Leases Receivable, Gross	274,001	221,102
Total Loans Receivable		221,102
Recorded Investment 90 days accruing	$0	$0

Loans_Receivable_and_Allowance5

Loans Receivable and Allowance for Loan Losses (Summary of Loans Receivable by Portfolio Segment and Impairment Method) (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	$90,808	$85,395
Collectively evaluated for impairment	6,031,036	5,996,982
Total Loans Receivable	6,121,844	6,082,377
Loans and Leases Receivable, Gross	6,121,844	6,082,377
Mortgage Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	65,563	66,548
Collectively evaluated for impairment	4,212,526	4,141,940
Total Loans Receivable	4,278,089	4,208,488
Loans and Leases Receivable, Gross	4,278,089	4,208,488
Commercial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	22,849	16,463
Collectively evaluated for impairment	1,219,716	1,245,959
Total Loans Receivable		1,262,422
Consumer Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	2,396	2,384
Collectively evaluated for impairment	598,794	609,083
Total Loans Receivable	$601,190	$611,467

Loans_Receivable_and_Allowance6

Loans Receivable and Allowance for Loan Losses (Summary of Allowance for Loan Losses by Portfolio Segment and Impairment Classification) (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	$6,653	$7,127
Collectively evaluated for impairment	54,457	54,607
Total	61,110	61,734	63,420	64,664
Mortgage Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	4,896	4,696
Collectively evaluated for impairment	27,990	27,281
Total	32,886	31,977	31,470	34,144
Commercial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	1,648	2,318
Collectively evaluated for impairment	22,049	22,063
Total	23,697	24,381	25,161	24,107
Consumer Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	109	113
Collectively evaluated for impairment	4,168	4,768
Total	4,277	4,881	4,379	4,929
Total Portfolio Segments [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	6,653	7,127
Collectively evaluated for impairment	54,207	54,112
Total	60,860	61,239	61,010	63,180
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	250	495
Total	$250	$495	$2,410	$1,484

Loans_Receivable_and_Allowance7

Loans Receivable and Allowance for Loan Losses (Schedule of Troubled Debt Restructurings) (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
	SecurityLoan	SecurityLoan
Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans	2	4
Pre-Modification Outstanding Recorded Investment	$322	$875
Post-Modification Outstanding Recorded Investment	321	835
Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans	1	0
Pre-Modification Outstanding Recorded Investment	2,600	0
Post-Modification Outstanding Recorded Investment	347	0
Mortgage Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans	3	4
Pre-Modification Outstanding Recorded Investment	2,922	875
Post-Modification Outstanding Recorded Investment	668	835
Commercial Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans	4	1
Pre-Modification Outstanding Recorded Investment	6,659	116
Post-Modification Outstanding Recorded Investment	6,898	28
Consumer Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans	1	0
Pre-Modification Outstanding Recorded Investment	44	0
Post-Modification Outstanding Recorded Investment	42	0
Total Restructured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Loans	8	5
Pre-Modification Outstanding Recorded Investment	9,625	991
Post-Modification Outstanding Recorded Investment	$7,608	$863

Loans_Receivable_and_Allowance8

Loans Receivable and Allowance for Loan Losses (Schedule of Troubled Debt Restructurings Subsequently Defaulted) (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
	SecurityLoan	SecurityLoan
Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Number of Loans	0	1
Outstanding Recorded Investment	$0	$90
Mortgage Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Number of Loans	0	1
Outstanding Recorded Investment	0	90
Commercial Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Number of Loans	0	3
Outstanding Recorded Investment	0	1,647
Total Restructured Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Number of Loans	0	4
Outstanding Recorded Investment	$0	$1,737

Loans_Receivable_and_Allowance9

Loans Receivable and Allowance for Loan Losses (PCI Loans Acquired) (Details) (Team Capital Bank [Member], USD $)	30-May-14
In Thousands, unless otherwise specified
Team Capital Bank [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Contractually required principal and interest	$12,505
Contractual cash flows not expected to be collected (non-accretable discount)	-6,475
Expected cash flows to be collected at acquisition	6,030
Interest component of expected cash flows (accretable yield)	-810
Fair value of acquired PCI loans	$5,220

Recovered_Sheet1

Loans Receivable and Allowance for Loan Losses (Change in Accretable Yield) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Beginning balance	$695
Acquisition	0
Accretion	-198
Reclassification from non-accretable difference	184
Ending balance	$681

Recovered_Sheet2

Loans Receivable and Allowance for Loan Losses (Schedule of Allowance for Loan Losses by Portfolio Segment) (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	$61,734	$64,664
Provision charged to operations	600	400
Recoveries of loans previously charged-off	491	431
Loans charged-off	-1,715	-2,075
Balance at end of period	61,110	63,420
Mortgage Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	31,977	34,144
Provision charged to operations	1,038	-2,000
Recoveries of loans previously charged-off	65	67
Loans charged-off	-194	-741
Balance at end of period	32,886	31,470
Commercial Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	24,381	24,107
Provision charged to operations	-477	1,330
Recoveries of loans previously charged-off	215	243
Loans charged-off	-422	-519
Balance at end of period	23,697	25,161
Consumer Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	4,881	4,929
Provision charged to operations	284	144
Recoveries of loans previously charged-off	211	121
Loans charged-off	-1,099	-815
Balance at end of period	4,277	4,379
Total Portfolio Segments [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	61,239	63,180
Provision charged to operations	845	-526
Recoveries of loans previously charged-off	491	431
Loans charged-off	-1,715	-2,075
Balance at end of period	60,860	61,010
Unallocated [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	495	1,484
Provision charged to operations	-245	926
Recoveries of loans previously charged-off	0	0
Loans charged-off	0	0
Balance at end of period	$250	$2,410

Recovered_Sheet3

Loans Receivable and Allowance for Loan Losses (Summary of Impaired Loans Receivable by Class) (Detail) (USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	$100,052	$94,514
Recorded Investment	90,808	85,395
Related Allowance	6,653	7,127
Average Recorded Investment	91,438	87,869
Interest Income Recognized	908	2,328
Residential [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	30,674	30,465
Recorded Investment	25,719	25,535
Related Allowance	2,382	2,367
Average Recorded Investment	25,912	26,244
Interest Income Recognized	493	912
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	40,995	42,526
Recorded Investment	39,497	41,014
Related Allowance	2,504	2,329
Average Recorded Investment	39,595	41,387
Interest Income Recognized	239	914
Multi-Family [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	0	0
Recorded Investment	0	0
Related Allowance	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Construction [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	347	0
Recorded Investment	347	0
Related Allowance	10	0
Average Recorded Investment	347	0
Interest Income Recognized	14	0
Mortgage Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	72,016	72,991
Recorded Investment	65,563	66,549
Related Allowance	4,896	4,696
Average Recorded Investment	65,854	67,631
Interest Income Recognized	746	1,826
Commercial Loan [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	25,182	18,708
Recorded Investment	22,849	16,462
Related Allowance	1,648	2,318
Average Recorded Investment	23,174	17,790
Interest Income Recognized	135	394
Consumer Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	2,854	2,815
Recorded Investment	2,396	2,384
Related Allowance	109	113
Average Recorded Investment	2,410	2,448
Interest Income Recognized	27	108
Loans With No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	28,070	23,881
Recorded Investment	22,710	18,346
Average Recorded Investment	22,985	18,544
Interest Income Recognized	175	389
Loans With No Related Allowance [Member] | Residential [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	15,230	14,942
Recorded Investment	10,895	10,629
Average Recorded Investment	11,048	11,138
Interest Income Recognized	107	357
Loans With No Related Allowance [Member] | Commercial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	2,613	4,971
Recorded Investment	2,574	4,708
Average Recorded Investment	2,574	4,713
Interest Income Recognized	0	0
Loans With No Related Allowance [Member] | Multi-Family [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	0	0
Recorded Investment	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Loans With No Related Allowance [Member] | Construction [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	0	0
Recorded Investment	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Loans With No Related Allowance [Member] | Mortgage Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	17,843	19,913
Recorded Investment	13,469	15,337
Average Recorded Investment	13,622	15,851
Interest Income Recognized	107	357
Loans With No Related Allowance [Member] | Commercial Loan [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	8,925	2,718
Recorded Investment	8,387	2,179
Average Recorded Investment	8,501	1,823
Interest Income Recognized	60	4
Loans With No Related Allowance [Member] | Consumer Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	1,302	1,250
Recorded Investment	854	830
Average Recorded Investment	862	870
Interest Income Recognized	8	28
Loans With Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	71,982	70,633
Recorded Investment	68,098	67,049
Related Allowance	6,653	7,127
Average Recorded Investment	68,453	69,325
Interest Income Recognized	733	1,939
Loans With Allowance Recorded [Member] | Residential [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	15,444	15,523
Recorded Investment	14,824	14,906
Related Allowance	2,382	2,367
Average Recorded Investment	14,864	15,106
Interest Income Recognized	386	555
Loans With Allowance Recorded [Member] | Commercial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	38,382	37,555
Recorded Investment	36,923	36,306
Related Allowance	2,504	2,329
Average Recorded Investment	37,021	36,674
Interest Income Recognized	239	914
Loans With Allowance Recorded [Member] | Multi-Family [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	0	0
Recorded Investment	0	0
Related Allowance	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Loans With Allowance Recorded [Member] | Construction [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	347	0
Recorded Investment	347	0
Related Allowance	10	0
Average Recorded Investment	347	0
Interest Income Recognized	14	0
Loans With Allowance Recorded [Member] | Mortgage Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	54,173	53,078
Recorded Investment	52,094	51,212
Related Allowance	4,896	4,696
Average Recorded Investment	52,232	51,780
Interest Income Recognized	639	1,469
Loans With Allowance Recorded [Member] | Commercial Loan [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	16,257	15,990
Recorded Investment	14,462	14,283
Related Allowance	1,648	2,318
Average Recorded Investment	14,673	15,967
Interest Income Recognized	75	390
Loans With Allowance Recorded [Member] | Consumer Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	1,552	1,565
Recorded Investment	1,542	1,554
Related Allowance	109	113
Average Recorded Investment	1,548	1,578
Interest Income Recognized	$19	$80

Recovered_Sheet4

Loans Receivable and Allowance for Loan Losses (Summary of Loans Receivable by Credit Quality Risk Rating Indicator) (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment [Line Items]
Total loans	$6,121,844	$6,082,377
Loans and Leases Receivable, Gross	6,121,844	6,082,377
Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total mortgage loans	1,245,711
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total mortgage loans	1,688,083
Multi-Family [Member]
Financing Receivable, Recorded Investment [Line Items]
Total mortgage loans	1,070,294
Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total mortgage loans	274,001
Mortgage Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total mortgage loans	4,278,089	4,208,488
Commercial Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,242,565	1,262,422
Loans and Leases Receivable, Gross	1,242,565	1,262,422
Consumer Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans		611,467
Loans and Leases Receivable, Gross	601,190	611,467
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	109,109	71,704
Special Mention [Member] | Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total mortgage loans	5,832	4,331
Special Mention [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total mortgage loans	43,749	18,414
Special Mention [Member] | Multi-Family [Member]
Financing Receivable, Recorded Investment [Line Items]
Total mortgage loans	1,105	851
Special Mention [Member] | Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total mortgage loans	0	0
Special Mention [Member] | Mortgage Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total mortgage loans	50,686	23,596
Special Mention [Member] | Commercial Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	57,403	45,599
Special Mention [Member] | Consumer Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,020	2,509
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	84,455	110,364
Substandard [Member] | Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total mortgage loans	16,913	17,222
Substandard [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total mortgage loans	30,773	53,454
Substandard [Member] | Multi-Family [Member]
Financing Receivable, Recorded Investment [Line Items]
Total mortgage loans	847	322
Substandard [Member] | Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total mortgage loans	347	2,600
Substandard [Member] | Mortgage Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total mortgage loans	48,880	73,598
Substandard [Member] | Commercial Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	32,410	32,828
Substandard [Member] | Consumer Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,165	3,938
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,089	1,092
Doubtful [Member] | Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total mortgage loans	0	0
Doubtful [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total mortgage loans	1,061	1,063
Doubtful [Member] | Multi-Family [Member]
Financing Receivable, Recorded Investment [Line Items]
Total mortgage loans	0	0
Doubtful [Member] | Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total mortgage loans	0	0
Doubtful [Member] | Mortgage Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total mortgage loans	1,061	1,063
Doubtful [Member] | Commercial Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	28	29
Doubtful [Member] | Consumer Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Loss [Member] | Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total mortgage loans	0	0
Loss [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total mortgage loans	0	0
Loss [Member] | Multi-Family [Member]
Financing Receivable, Recorded Investment [Line Items]
Total mortgage loans	0	0
Loss [Member] | Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total mortgage loans	0	0
Loss [Member] | Mortgage Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total mortgage loans	0	0
Loss [Member] | Commercial Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Loss [Member] | Consumer Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Total classified and criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	194,653	183,160
Total classified and criticized [Member] | Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total mortgage loans	22,745	21,553
Total classified and criticized [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total mortgage loans	75,583	72,931
Total classified and criticized [Member] | Multi-Family [Member]
Financing Receivable, Recorded Investment [Line Items]
Total mortgage loans	1,952	1,173
Total classified and criticized [Member] | Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total mortgage loans	347	2,600
Total classified and criticized [Member] | Mortgage Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total mortgage loans	100,627	98,257
Total classified and criticized [Member] | Commercial Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	89,841	78,456
Total classified and criticized [Member] | Consumer Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,185	6,447
Pass/Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,927,191	5,899,217
Pass/Watch [Member] | Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total mortgage loans	1,222,966	1,229,892
Pass/Watch [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total mortgage loans	1,612,500	1,621,428
Pass/Watch [Member] | Multi-Family [Member]
Financing Receivable, Recorded Investment [Line Items]
Total mortgage loans	1,068,342	1,040,409
Pass/Watch [Member] | Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total mortgage loans	273,654	218,502
Pass/Watch [Member] | Mortgage Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total mortgage loans	4,177,462	4,110,231
Pass/Watch [Member] | Commercial Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,152,724	1,183,966
Pass/Watch [Member] | Consumer Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	$597,005	$605,020

Deposits_Schedule_of_Deposits_

Deposits (Schedule of Deposits) (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Banking and Thrift [Abstract]
Savings	$985,464	$995,347
Money market	1,501,964	1,496,466
NOW	1,454,504	1,425,424
Non-interest bearing	1,075,197	1,049,597
Certificates of deposit	805,922	825,689
Total deposits	$5,823,051	$5,792,523

Components_of_Net_Periodic_Ben2

Components of Net Periodic Benefit Cost (Narrative) (Detail) (USD $)	0 Months Ended	3 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Apr. 01, 2003	Mar. 31, 2015	Dec. 31, 2006	Dec. 31, 2002	Apr. 01, 2003
Compensation and Retirement Disclosure [Abstract]
Defined benefit plan age of attainment	21 years
Service period for employees of coverage age, years	1 year
Defined benefit plan, percentage vested					100.00%
Benefits paid		$4.30
Charge associated with employees that elected to receive lump sum pension distributions		$1.30
Retiree benefits eliminated if less than service period, years		10 years	10 years	10 years

Components_of_Net_Periodic_Ben3

Components of Net Periodic Benefit Cost (Net Periodic Benefit Cost (Increase)) (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Pension benefits [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Service cost	$0	$0
Interest cost	284	352
Expected return on plan assets	-633	-894
Amortization of prior service cost	0	0
Amortization of the net loss (gain)	194	93
Net periodic benefit cost (increase)	-155	-449
Other post-retirement benefits [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Service cost	42	42
Interest cost	281	272
Expected return on plan assets	0	0
Amortization of prior service cost	0	-1
Amortization of the net loss (gain)	0	-51
Net periodic benefit cost (increase)	$323	$262

Fair_Value_Measurements_Narrat

Fair Value Measurements (Narrative) (Detail) (Maximum [Member])	3 Months Ended
	Mar. 31, 2015
Maximum [Member]
Fair Value Inputs, Equity, Quantitative Information [Line Items]
Estimated costs	6.00%

Fair_Value_Measurements_Assets

Fair Value Measurements (Assets and Liabilities Reported on Consolidated Statements of Financial Condition at Fair Values) (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Securities available for sale:
Securities available for sale, at fair value	$1,047,559	$1,074,395
Liability derivative	3,338
Measured on a non-recurring basis:
Foreclosed assets	5,924	5,098
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Securities available for sale:
Securities available for sale, at fair value	103,767	103,616
Significant Other Observable Inputs (Level 2) [Member]
Securities available for sale:
Securities available for sale, at fair value	943,792	970,779
Asset derivative	3,216	2,046
Liability derivative	3,285	2,052
Significant Unobservable Inputs (Level 3) [Member]
Securities available for sale:
Securities available for sale, at fair value	0	0
US Treasury Obligations [Member]
Securities available for sale:
Securities available for sale, at fair value	8,071	8,016
US 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	8,071	8,016
US Treasury Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member]
Securities available for sale:
Securities available for sale, at fair value	0	0
US 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	95,157	95,076
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	932,113	957,257
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	932,113	957,257
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	6,083	7,002
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	6,083	7,002
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	5,596	6,520
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	5,596	6,520
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	539	524
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	539	524
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	1,047,559	1,074,395
Asset derivative	3,216	2,046
Total assets at fair value	1,050,775	1,076,441
Liability derivative	3,285	2,052
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	103,767	103,616
Asset derivative	0	0
Total assets at fair value	103,767	103,616
Liability derivative	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	943,792	970,779
Asset derivative	3,216	2,046
Total assets at fair value	947,008	972,825
Liability derivative	3,285	2,052
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
Asset derivative	0
Total assets at fair value	0	0
Liability derivative	0
Measured on a Recurring Basis [Member] | US Treasury Obligations [Member]
Securities available for sale:
Securities available for sale, at fair value	8,071	8,016
Measured on a Recurring Basis [Member] | US 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	8,071	8,016
Measured on a Recurring Basis [Member] | US 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] | US 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	95,157	95,076
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	95,157	95,076
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	932,113	957,257
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	932,113	957,257
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	6,083	7,002
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	6,083	7,002
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	5,596
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
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	5,596
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
Measured on a Recurring Basis [Member] | Equity Securities [Member]
Securities available for sale:
Securities available for sale, at fair value	539	524
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	539	524
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	23,010	23,086
Foreclosed assets	5,924	5,098
Fair value, Measured on a non-recurring basis	28,934	28,184
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	23,010	23,086
Foreclosed assets	5,924	5,098
Fair value, Measured on a non-recurring basis	$28,934	$28,184

Fair_Value_Measurements_Schedu

Fair Value Measurements (Schedule of Financial Instruments at Carrying and Fair Values) (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Financial assets:
Cash and cash equivalents	$90,874,000	$103,762,000	$81,658,000	$101,224,000
Securities available for sale, at fair value	1,047,559,000	1,074,395,000
Investment securities held to maturity:
Investment securities held to maturity	473,704,000	469,528,000
FHLB-NY stock	67,455,000	69,789,000
Loans, net of allowance for loan losses	6,063,589,000	6,023,771,000
Financial liabilities:
Certificates of deposit	805,922,000	825,689,000
Total deposits	5,823,051,000	5,792,523,000
Borrowings	1,468,404,000	1,509,851,000
Liability derivative	3,338,000
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Cash and cash equivalents	90,874,000	103,762,000
Securities available for sale, at fair value	103,767,000	103,616,000
Investment securities held to maturity:
Investment securities held to maturity	7,143,000	6,810,000
FHLB-NY stock	67,455,000	69,789,000
Loans, net of allowance for loan losses	0	0
Financial liabilities:
Deposits other than certificates of deposits	5,017,129,000	4,966,834,000
Certificates of deposit	0	0
Total deposits	5,017,129,000	4,966,834,000
Borrowings	0	0
Significant Other Observable Inputs (Level 2) [Member]
Financial assets:
Cash and cash equivalents	0	0
Securities available for sale, at fair value	943,792,000	970,779,000
Investment securities held to maturity:
Investment securities held to maturity	480,528,000	475,663,000
FHLB-NY stock	0	0
Loans, net of allowance for loan losses	0	0
Asset derivative	3,216,000	2,046,000
Financial liabilities:
Deposits other than certificates of deposits	0	0
Certificates of deposit	809,036,000	830,233,000
Total deposits	809,036,000	830,233,000
Borrowings	1,489,209,000	1,516,966,000
Liability derivative	3,285,000	2,052,000
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	0	0
FHLB-NY stock	0	0
Loans, net of allowance for loan losses	6,165,229,000	6,104,558,000
Financial liabilities:
Deposits other than certificates of deposits	0	0
Certificates of deposit	0	0
Total deposits	0	0
Borrowings	0	0
Carrying Value [Member]
Financial assets:
Cash and cash equivalents	90,874,000	103,762,000
Securities available for sale, at fair value	1,047,559,000	1,074,395,000
Investment securities held to maturity:
Investment securities held to maturity	473,704,000	469,528,000
FHLB-NY stock	67,455,000	69,789,000
Loans, net of allowance for loan losses	6,063,589,000	6,023,771,000
Asset derivative	3,216,000	2,046,000
Financial liabilities:
Deposits other than certificates of deposits	5,017,129,000	4,966,834,000
Certificates of deposit	805,922,000	825,689,000
Total deposits	5,823,051,000	5,792,523,000
Borrowings	1,468,404,000	1,509,851,000
Liability derivative	3,285,000	2,052,000
Fair Value [Member]
Financial assets:
Cash and cash equivalents	90,874,000	103,762,000
Securities available for sale, at fair value	1,047,559,000	1,074,395,000
Investment securities held to maturity:
Investment securities held to maturity	487,671,000	482,473,000
FHLB-NY stock	67,455,000	69,789,000
Loans, net of allowance for loan losses	6,165,229,000	6,104,558,000
Asset derivative	3,216,000	2,046,000
Financial liabilities:
Deposits other than certificates of deposits	5,017,129,000	4,966,834,000
Certificates of deposit	809,036,000	830,233,000
Total deposits	5,826,165,000	5,797,067,000
Borrowings	1,489,209,000	1,516,966,000
Liability derivative	3,285,000	2,052,000
US Treasury Obligations [Member]
Financial assets:
Securities available for sale, at fair value	8,071,000	8,016,000
US Treasury Obligations [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Securities available for sale, at fair value	8,071,000	8,016,000
US Treasury Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets:
Securities available for sale, at fair value	0	0
US Treasury Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member]
Financial assets:
Securities available for sale, at fair value	0	0
US Treasury Obligations [Member] | Carrying Value [Member]
Financial assets:
Securities available for sale, at fair value	8,071,000	8,016,000
US Treasury Obligations [Member] | Fair Value [Member]
Financial assets:
Securities available for sale, at fair value	8,071,000	8,016,000
Agency Obligations [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Securities available for sale, at fair value	95,157,000	95,076,000
Investment securities held to maturity:
Investment securities held to maturity	7,143,000	6,810,000
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	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	0	0
Agency Obligations [Member] | Carrying Value [Member]
Financial assets:
Securities available for sale, at fair value	95,157,000	95,076,000
Investment securities held to maturity:
Investment securities held to maturity	7,131,000	6,813,000
Agency Obligations [Member] | Fair Value [Member]
Financial assets:
Securities available for sale, at fair value	95,157,000	95,076,000
Investment securities held to maturity:
Investment securities held to maturity	7,143,000	6,810,000
Mortgage-Backed Securities [Member]
Financial assets:
Securities available for sale, at fair value	932,113,000	957,257,000
Investment securities held to maturity:
Investment securities held to maturity	2,511,000	2,816,000
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	0	0
Mortgage-Backed Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets:
Securities available for sale, at fair value	932,113,000	957,257,000
Investment securities held to maturity:
Investment securities held to maturity	2,620,000	2,939,000
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	0	0
Mortgage-Backed Securities [Member] | Carrying Value [Member]
Financial assets:
Securities available for sale, at fair value	932,113,000	957,257,000
Investment securities held to maturity:
Investment securities held to maturity	2,511,000	2,816,000
Mortgage-Backed Securities [Member] | Fair Value [Member]
Financial assets:
Securities available for sale, at fair value	932,113,000	957,257,000
Investment securities held to maturity:
Investment securities held to maturity	2,620,000	2,939,000
State and Municipal Obligations [Member]
Financial assets:
Securities available for sale, at fair value	6,083,000	7,002,000
Investment securities held to maturity:
Investment securities held to maturity	453,339,000	449,410,000
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	0	0
State and Municipal Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets:
Securities available for sale, at fair value	6,083,000	7,002,000
Investment securities held to maturity:
Investment securities held to maturity	467,121,000	462,238,000
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	0	0
State and Municipal Obligations [Member] | Carrying Value [Member]
Financial assets:
Securities available for sale, at fair value	6,083,000	7,002,000
Investment securities held to maturity:
Investment securities held to maturity	453,339,000	449,410,000
State and Municipal Obligations [Member] | Fair Value [Member]
Financial assets:
Securities available for sale, at fair value	6,083,000	7,002,000
Investment securities held to maturity:
Investment securities held to maturity	467,121,000	462,238,000
Corporate Obligations [Member]
Financial assets:
Securities available for sale, at fair value	5,596,000	6,520,000
Investment securities held to maturity:
Investment securities held to maturity	10,723,000	10,489,000
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	0	0
Corporate Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets:
Securities available for sale, at fair value	5,596,000	6,520,000
Investment securities held to maturity:
Investment securities held to maturity	10,787,000	10,486,000
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	0	0
Corporate Obligations [Member] | Carrying Value [Member]
Financial assets:
Securities available for sale, at fair value	5,596,000	6,520,000
Investment securities held to maturity:
Investment securities held to maturity	10,723,000	10,489,000
Corporate Obligations [Member] | Fair Value [Member]
Financial assets:
Securities available for sale, at fair value	5,596,000	6,520,000
Investment securities held to maturity:
Investment securities held to maturity	10,787,000	10,486,000
Equity Securities [Member]
Financial assets:
Securities available for sale, at fair value	539,000	524,000
Equity Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Securities available for sale, at fair value	539,000	524,000
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	539,000	524,000
Equity Securities [Member] | Fair Value [Member]
Financial assets:
Securities available for sale, at fair value	$539,000	$524,000

Other_Comprehensive_Income_Los2

Other Comprehensive Income (Loss) (Components of Other Comprehensive Income (Loss)) (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive (loss) income, Before Tax	$6,193	$6,556
Total other comprehensive (loss) income, Tax Effect	-2,487	-2,678
Total other comprehensive income	3,706	3,878
Unrealized gains and losses on securities available for sale:
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net (losses) gains, Before Tax	6,202	6,287
Reclassification adjustment, Before Tax	-2	350
Total other comprehensive (loss) income, Before Tax	6,200	6,637
Net (losses) gains, Tax Effect	-2,491	-2,568
Reclassification adjustment, Tax Effect	-1	143
Total other comprehensive (loss) income, Tax Effect	-2,490	-2,711
Net (losses) gains, After Tax	3,711	3,719
Reclassification adjustment, After Tax	-1	207
Total other comprehensive income	3,710	3,926
Amortization related to post-retirement obligations
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive (loss) income, Before Tax	-7	-81
Total other comprehensive (loss) income, Tax Effect	3	33
Total other comprehensive income	($4)	($48)

Other_Comprehensive_Income_Los3

Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income, Net of Tax) (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$29	($4,851)
Current period change in other comprehensive income (loss)	3,706	3,878
Ending balance	3,735	-973
Unrealized gains and losses on securities available for sale:
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	7,743	-2,799
Current period change in other comprehensive income (loss)	3,710	3,926
Ending balance	11,453	1,127
Amortization related to post-retirement obligations
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	-7,714	-2,052
Current period change in other comprehensive income (loss)	-4	-48
Ending balance	($7,718)	($2,100)

Other_Comprehensive_Income_Los4

Other Comprehensive Income (Loss) (Reclassifications Out of Accumulated Other Comprehensive Income) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax expense	($8,392)		($7,698)
Net income	19,802		17,029
Reclassification adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net income	116		-182
Reclassification adjustment | Securities available for sale
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net gain (loss) on securities transactions	2		-350
Income tax expense	-1		143
Net income	1		-207
Reclassification adjustment | Amortization related to post-retirement obligations
Accumulated Other Comprehensive Income (Loss) [Line Items]
Compensation and employee benefits, amortization of actuarial losses (gains)	194	[1]	42	[1]
Income tax expense	-79		-17
Net income	$115		$25
[1]	This item is included in the computation of net periodic benefit cost. See Note 6. Components of Net Periodic Benefit Cost.

Derivatives_and_Hedging_Activi2

Derivatives and Hedging Activities (Narrative) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
	instrument
Derivative [Line Items]
Liability derivative	$3,338,000
Collateral against obligations	2,980,000
Interest rate products
Derivative [Line Items]
Number of derivative instruments held (in instrument)	11
Derivative notional amount	$110,700,000	$94,900,000

Derivatives_and_Hedging_Activi3

Derivatives and Hedging Activities (Fair Value of Derivatives) (Details) (Derivatives not designated as a hedging instruments, USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Derivatives, Fair Value [Line Items]
Asset Derivatives	$3,216	$2,046
Liability Derivatives	3,285	2,052
Other Assets | Interest rate products
Derivatives, Fair Value [Line Items]
Asset Derivatives	3,208	2,040
Other Assets | Credit contracts
Derivatives, Fair Value [Line Items]
Asset Derivatives	8	6
Other Liabilities | Interest rate products
Derivatives, Fair Value [Line Items]
Liability Derivatives	$3,285	$2,052

Derivatives_and_Hedging_Activi4

Derivatives and Hedging Activities (Gains and Losses on Derivatives) (Details) (Derivatives not designated as a hedging instruments, USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in Income on derivatives	($64)
Other Income | Interest rate products
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in Income on derivatives	-65
Other Income | Credit contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in Income on derivatives	$1