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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	1,047,559,000us-gaap_AvailableForSaleSecurities	1,074,395,000us-gaap_AvailableForSaleSecurities
Investment securities held to maturity:
Investment securities held to maturity	473,704,000us-gaap_HeldToMaturitySecurities	469,528,000us-gaap_HeldToMaturitySecurities
FHLB-NY stock	67,455,000us-gaap_FederalHomeLoanBankStock	69,789,000us-gaap_FederalHomeLoanBankStock
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	5,823,051,000us-gaap_Deposits	5,792,523,000us-gaap_Deposits
Borrowings	1,468,404,000us-gaap_OtherBorrowings	1,509,851,000us-gaap_OtherBorrowings
Liability derivative	3,338,000us-gaap_DerivativeLiabilities
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