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Financial Liabilities [Abstract]

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No definition available.

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Summary Of Investment Securities Held To Maturity [Abstract]

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No definition available.

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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 classified as other. Excludes 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	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Financial assets:
Cash and cash equivalents	$ 158,094	$ 144,297	$ 108,111	$ 102,226
Securities available for sale, at fair value	1,048,119	1,040,386
Investment securities held to maturity:
Investment securities held to maturity	489,114	488,183
FHLBNY stock	76,636	75,726
Loans, net of allowance for loan losses	6,935,914	6,941,603
Financial liabilities:
Certificates of deposit	679,373	651,183
Total deposits	6,529,870	6,553,629
Borrowings	1,640,559	1,612,745
Derivative liabilities	746
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Cash and cash equivalents	158,094	144,297
Securities available for sale, at fair value	57,662	65,745
Investment securities held to maturity:
Investment securities held to maturity	4,572	4,225
FHLBNY stock	76,636	75,726
Loans, net of allowance for loan losses	0	0
Derivative assets	0	0
Financial liabilities:
Deposits other than certificates of deposits	5,850,497	5,902,446
Certificates of deposit	0	0
Total deposits	5,850,497	5,902,446
Borrowings	0	0
Derivative liabilities	0	0
Significant Other Observable Inputs (Level 2) [Member]
Financial assets:
Cash and cash equivalents	0	0
Securities available for sale, at fair value	990,457	974,641
Investment securities held to maturity:
Investment securities held to maturity	488,291	485,062
FHLBNY stock	0	0
Loans, net of allowance for loan losses	0	0
Derivative assets	7,429	7,441
Financial liabilities:
Deposits other than certificates of deposits	0	0
Certificates of deposit	681,891	653,772
Total deposits	681,891	653,772
Borrowings	1,643,088	1,617,023
Derivative liabilities	6,872	6,750
Significant Unobservable Inputs (Level 3) [Member]
Financial assets:
Cash and cash equivalents	0	0
Securities available for sale, at fair value	0	0
Investment securities held to maturity:
Investment securities held to maturity	0	0
FHLBNY stock	0	0
Loans, net of allowance for loan losses	6,915,009	6,924,440
Derivative assets	0	0
Financial liabilities:
Deposits other than certificates of deposits	0	0
Certificates of deposit	0	0
Total deposits	0	0
Borrowings	0	0
Derivative liabilities	0	0
Carrying Value [Member]
Financial assets:
Cash and cash equivalents	158,094	144,297
Securities available for sale, at fair value	1,048,119	1,040,386
Investment securities held to maturity:
Investment securities held to maturity	489,114	488,183
FHLBNY stock	76,636	75,726
Loans, net of allowance for loan losses	6,935,914	6,941,603
Derivative assets	7,429	7,441
Financial liabilities:
Deposits other than certificates of deposits	5,850,497	5,902,446
Certificates of deposit	679,373	651,183
Total deposits	6,529,870	6,553,629
Borrowings	1,640,559	1,612,745
Derivative liabilities	6,872	6,750
Fair Value [Member]
Financial assets:
Cash and cash equivalents	158,094	144,297
Securities available for sale, at fair value	1,048,119	1,040,386
Investment securities held to maturity:
Investment securities held to maturity	492,863	489,287
FHLBNY stock	76,636	75,726
Loans, net of allowance for loan losses	6,915,009	6,924,440
Derivative assets	7,429	7,441
Financial liabilities:
Deposits other than certificates of deposits	5,850,497	5,902,446
Certificates of deposit	681,891	653,772
Total deposits	6,532,388	6,556,218
Borrowings	1,643,088	1,617,023
Derivative liabilities	6,872	6,750
US Treasury Obligations [Member]
Financial assets:
Securities available for sale, at fair value	7,996	8,008
US Treasury Obligations [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Securities available for sale, at fair value	7,996	8,008
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	7,996	8,008
US Treasury Obligations [Member] \| Fair Value [Member]
Financial assets:
Securities available for sale, at fair value	7,996	8,008
Agency Obligations [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Securities available for sale, at fair value	49,108	57,188
Investment securities held to maturity:
Investment securities held to maturity	4,572	4,225
Agency Obligations [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Financial assets:
Securities available for sale, at fair value	0	0
Investment securities held to maturity:
Investment securities held to maturity	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	49,108	57,188
Investment securities held to maturity:
Investment securities held to maturity	4,656	4,306
Agency Obligations [Member] \| Fair Value [Member]
Financial assets:
Securities available for sale, at fair value	49,108	57,188
Investment securities held to maturity:
Investment securities held to maturity	4,572	4,225
Mortgage-Backed Securities [Member]
Financial assets:
Securities available for sale, at fair value	967,318	951,861
Investment securities held to maturity:
Investment securities held to maturity	680	893
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	967,318	951,861
Investment securities held to maturity:
Investment securities held to maturity	705	924
Mortgage-Backed Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Financial assets:
Securities available for sale, at fair value	0	0
Investment securities held to maturity:
Investment securities held to maturity	0	0
Mortgage-Backed Securities [Member] \| Carrying Value [Member]
Financial assets:
Securities available for sale, at fair value	967,318	951,861
Investment securities held to maturity:
Investment securities held to maturity	680	893
Mortgage-Backed Securities [Member] \| Fair Value [Member]
Financial assets:
Securities available for sale, at fair value	967,318	951,861
Investment securities held to maturity:
Investment securities held to maturity	705	924
State And Municipal Obligations [Member]
Financial assets:
Securities available for sale, at fair value	3,791	3,743
Investment securities held to maturity:
Investment securities held to maturity	474,677	473,653
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	3,791	3,743
Investment securities held to maturity:
Investment securities held to maturity	478,517	474,852
State And Municipal Obligations [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Financial assets:
Securities available for sale, at fair value	0	0
Investment securities held to maturity:
Investment securities held to maturity	0	0
State And Municipal Obligations [Member] \| Carrying Value [Member]
Financial assets:
Securities available for sale, at fair value	3,791	3,743
Investment securities held to maturity:
Investment securities held to maturity	474,677	473,653
State And Municipal Obligations [Member] \| Fair Value [Member]
Financial assets:
Securities available for sale, at fair value	3,791	3,743
Investment securities held to maturity:
Investment securities held to maturity	478,517	474,852
Corporate Obligations [Member]
Financial assets:
Securities available for sale, at fair value	19,348	19,037
Investment securities held to maturity:
Investment securities held to maturity	9,101	9,331
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	19,348	19,037
Investment securities held to maturity:
Investment securities held to maturity	9,069	9,286
Corporate Obligations [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Financial assets:
Securities available for sale, at fair value	0	0
Investment securities held to maturity:
Investment securities held to maturity	0	0
Corporate Obligations [Member] \| Carrying Value [Member]
Financial assets:
Securities available for sale, at fair value	19,348	19,037
Investment securities held to maturity:
Investment securities held to maturity	9,101	9,331
Corporate Obligations [Member] \| Fair Value [Member]
Financial assets:
Securities available for sale, at fair value	19,348	19,037
Investment securities held to maturity:
Investment securities held to maturity	9,069	9,286
Equity Securities [Member]
Financial assets:
Securities available for sale, at fair value	558	549
Equity Securities [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Securities available for sale, at fair value	558	549
Equity Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Financial assets:
Securities available for sale, at fair value	0	0
Equity Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Financial assets:
Securities available for sale, at fair value	0	0
Equity Securities [Member] \| Carrying Value [Member]
Financial assets:
Securities available for sale, at fair value	558	549
Equity Securities [Member] \| Fair Value [Member]
Financial assets:
Securities available for sale, at fair value	$ 558	$ 549