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Financial Liabilities [Abstract]

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Summary Of Investment Securities Held To Maturity [Abstract]

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Amount of interest-bearing domestic certificate of deposit liabilities.

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Amount of interest-bearing domestic deposit liabilities for time deposit liabilities other than certificates of deposit.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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The carrying amount as of the balance sheet date for the aggregate of other miscellaneous borrowings owed by the reporting entity.

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Fair Value Measurements (Schedule of Financial Instruments at Carrying and Fair Values) (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Financial assets:
Cash and cash equivalents	$ 104,732	$ 103,762	$ 132,439	$ 101,224
Securities available for sale, at fair value	1,031,325	1,074,395
Investment securities held to maturity:
Investment securities held to maturity	471,984	469,528
FHLBNY stock	77,892	69,789
Loans, net of allowance for loan losses	6,248,729	6,023,771
Financial liabilities:
Certificates of deposit	795,938	825,689
Total deposits	5,814,221	5,792,523
Borrowings	1,684,574	1,509,851
Liability derivative	2,324
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Cash and cash equivalents	104,732	103,762
Securities available for sale, at fair value	103,501	103,616
Investment securities held to maturity:
Investment securities held to maturity	6,001	6,810
FHLBNY stock	77,892	69,789
Loans, net of allowance for loan losses	0	0
Financial liabilities:
Deposits other than certificates of deposits	5,018,283	4,966,834
Certificates of deposit	0	0
Total deposits	5,018,283	4,966,834
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	927,824	970,779
Investment securities held to maturity:
Investment securities held to maturity	470,791	475,663
FHLBNY stock	0	0
Loans, net of allowance for loan losses	0	0
Asset derivative	2,830	2,046
Financial liabilities:
Deposits other than certificates of deposits	0	0
Certificates of deposit	799,279	830,233
Total deposits	799,279	830,233
Borrowings	1,698,940	1,516,966
Liability derivative	2,426	2,052
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
FHLBNY stock	0	0
Loans, net of allowance for loan losses	6,308,626	6,104,558
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	104,732	103,762
Securities available for sale, at fair value	1,031,325	1,074,395
Investment securities held to maturity:
Investment securities held to maturity	471,984	469,528
FHLBNY stock	77,892	69,789
Loans, net of allowance for loan losses	6,248,729	6,023,771
Asset derivative	2,830	2,046
Financial liabilities:
Deposits other than certificates of deposits	5,018,283	4,966,834
Certificates of deposit	795,938	825,689
Total deposits	5,814,221	5,792,523
Borrowings	1,684,574	1,509,851
Liability derivative	2,426	2,052
Fair Value [Member]
Financial assets:
Cash and cash equivalents	104,732	103,762
Securities available for sale, at fair value	1,031,325	1,074,395
Investment securities held to maturity:
Investment securities held to maturity	476,792	482,473
FHLBNY stock	77,892	69,789
Loans, net of allowance for loan losses	6,308,626	6,104,558
Asset derivative	2,830	2,046
Financial liabilities:
Deposits other than certificates of deposits	5,018,283	4,966,834
Certificates of deposit	799,279	830,233
Total deposits	5,817,562	5,797,067
Borrowings	1,698,940	1,516,966
Liability derivative	2,426	2,052
US Treasury Obligations [Member]
Financial assets:
Securities available for sale, at fair value	8,061	8,016
US Treasury Obligations [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Securities available for sale, at fair value	8,061	8,016
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	8,061	8,016
US Treasury Obligations [Member] \| Fair Value [Member]
Financial assets:
Securities available for sale, at fair value	8,061	8,016
Agency Obligations [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Securities available for sale, at fair value	94,906	95,076
Investment securities held to maturity:
Investment securities held to maturity	6,001	6,810
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	94,906	95,076
Investment securities held to maturity:
Investment securities held to maturity	5,999	6,813
Agency Obligations [Member] \| Fair Value [Member]
Financial assets:
Securities available for sale, at fair value	94,906	95,076
Investment securities held to maturity:
Investment securities held to maturity	6,001	6,810
Collateralized Mortgage Backed Securities [Member]
Financial assets:
Securities available for sale, at fair value	916,375	957,257
Investment securities held to maturity:
Investment securities held to maturity	2,169	2,816
Collateralized 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
Collateralized Mortgage Backed Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Financial assets:
Securities available for sale, at fair value	916,375	957,257
Investment securities held to maturity:
Investment securities held to maturity	2,260	2,939
Collateralized 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
Collateralized Mortgage Backed Securities [Member] \| Carrying Value [Member]
Financial assets:
Securities available for sale, at fair value	916,375	957,257
Investment securities held to maturity:
Investment securities held to maturity	2,169	2,816
Collateralized Mortgage Backed Securities [Member] \| Fair Value [Member]
Financial assets:
Securities available for sale, at fair value	916,375	957,257
Investment securities held to maturity:
Investment securities held to maturity	2,260	2,939
State And Municipal Obligations [Member]
Financial assets:
Securities available for sale, at fair value	5,960	7,002
Investment securities held to maturity:
Investment securities held to maturity	453,484	449,410
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	5,960	7,002
Investment securities held to maturity:
Investment securities held to maturity	458,176	462,238
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	5,960	7,002
Investment securities held to maturity:
Investment securities held to maturity	453,484	449,410
State And Municipal Obligations [Member] \| Fair Value [Member]
Financial assets:
Securities available for sale, at fair value	5,960	7,002
Investment securities held to maturity:
Investment securities held to maturity	458,176	462,238
Equity Securities [Member]
Financial assets:
Securities available for sale, at fair value	534	524
Equity Securities [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Securities available for sale, at fair value	534	524
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	534	524
Equity Securities [Member] \| Fair Value [Member]
Financial assets:
Securities available for sale, at fair value	534	524
Corporate Obligations [Member]
Financial assets:
Securities available for sale, at fair value	5,489	6,520
Investment securities held to maturity:
Investment securities held to maturity	10,332	10,489
Corporate Obligations [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Securities available for sale, at fair value	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	5,489
Investment securities held to maturity:
Investment securities held to maturity	10,355	10,486
Corporate Obligations [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Financial assets:
Securities available for sale, at fair value	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	5,489
Investment securities held to maturity:
Investment securities held to maturity	10,332	10,489
Corporate Obligations [Member] \| Fair Value [Member]
Financial assets:
Securities available for sale, at fair value	5,489
Investment securities held to maturity:
Investment securities held to maturity	$ 10,355	$ 10,486