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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	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
Financial assets:
Cash and cash equivalents	$ 159,674	$ 102,226	$ 128,433	$ 103,762
Securities available for sale, at fair value	1,032,235	964,534
Investment securities held to maturity:
Investment securities held to maturity	476,359	473,684
FHLBNY stock	71,019	78,181
Loans, net of allowance for loan losses	6,829,498	6,476,250
Financial liabilities:
Certificates of deposit	668,430	739,721
Total deposits	6,527,498	5,923,987
Borrowings	1,522,368	1,707,632
Derivative liabilities	20,400
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Cash and cash equivalents	159,674	102,226
Securities available for sale, at fair value	77,969	90,853
Investment securities held to maturity:
Investment securities held to maturity	2,688	4,097
FHLBNY stock	71,019	78,181
Loans, net of allowance for loan losses	0	0
Derivative assets	0	0
Financial liabilities:
Deposits other than certificates of deposits	5,859,068	5,184,266
Certificates of deposit	0	0
Total deposits	5,859,068	5,184,266
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	954,266	873,681
Investment securities held to maturity:
Investment securities held to maturity	492,828	484,234
FHLBNY stock	0	0
Loans, net of allowance for loan losses	0	0
Derivative assets	18,641	6,854
Financial liabilities:
Deposits other than certificates of deposits	0	0
Certificates of deposit	670,146	742,020
Total deposits	670,146	742,020
Borrowings	1,540,977	1,726,726
Derivative liabilities	20,216	6,745
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	6,924,746	6,509,502
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		102,226
Securities available for sale, at fair value	1,032,235	964,534
Investment securities held to maturity:
Investment securities held to maturity	476,359	473,684
FHLBNY stock		78,181
Loans, net of allowance for loan losses		6,476,250
Derivative assets	18,641	6,854
Financial liabilities:
Deposits other than certificates of deposits	5,859,068	5,184,266
Certificates of deposit	668,430	739,721
Total deposits	6,527,498	5,923,987
Borrowings	1,522,368	1,707,632
Derivative liabilities	20,216	6,745
Fair Value [Member]
Financial assets:
Cash and cash equivalents	159,674	102,226
Securities available for sale, at fair value	1,032,235	964,534
Investment securities held to maturity:
Investment securities held to maturity	495,516	488,331
FHLBNY stock	71,019	78,181
Loans, net of allowance for loan losses	6,924,746	6,509,502
Derivative assets	18,641	6,854
Financial liabilities:
Deposits other than certificates of deposits	5,859,068	5,184,266
Certificates of deposit	670,146	742,020
Total deposits	6,529,214	5,926,286
Borrowings	1,540,977	1,726,726
Derivative liabilities	20,216	6,745
US Treasury Obligations [Member]
Financial assets:
Securities available for sale, at fair value	8,031	8,004
US Treasury Obligations [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Securities available for sale, at fair value	8,031	8,004
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	8,031	8,004
US Treasury Obligations [Member] \| Fair Value [Member]
Financial assets:
Securities available for sale, at fair value	8,031	8,004
Agency Obligations [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Securities available for sale, at fair value	69,390	82,330
Investment securities held to maturity:
Investment securities held to maturity	2,688	4,097
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	69,390	82,330
Investment securities held to maturity:
Investment securities held to maturity		4,096
Agency Obligations [Member] \| Fair Value [Member]
Financial assets:
Securities available for sale, at fair value	69,390	82,330
Investment securities held to maturity:
Investment securities held to maturity		4,097
Mortgage-Backed Securities [Member]
Financial assets:
Securities available for sale, at fair value	935,781	863,861
Investment securities held to maturity:
Investment securities held to maturity	1,037	1,597
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	935,781	863,861
Investment securities held to maturity:
Investment securities held to maturity	1,079	1,658
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	935,781	863,861
Investment securities held to maturity:
Investment securities held to maturity		1,597
Mortgage-Backed Securities [Member] \| Fair Value [Member]
Financial assets:
Securities available for sale, at fair value	935,781	863,861
Investment securities held to maturity:
Investment securities held to maturity		1,658
State And Municipal Obligations [Member]
Financial assets:
Securities available for sale, at fair value	4,353	4,308
Investment securities held to maturity:
Investment securities held to maturity	462,603	458,062
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	4,353	4,308
Investment securities held to maturity:
Investment securities held to maturity	481,694	472,661
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	4,353	4,308
Investment securities held to maturity:
Investment securities held to maturity		458,062
State And Municipal Obligations [Member] \| Fair Value [Member]
Financial assets:
Securities available for sale, at fair value	4,353	4,308
Investment securities held to maturity:
Investment securities held to maturity		472,661
Corporate Obligations [Member]
Financial assets:
Securities available for sale, at fair value	14,132	5,512
Investment securities held to maturity:
Investment securities held to maturity	10,031	9,929
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	14,132	5,512
Investment securities held to maturity:
Investment securities held to maturity	10,055	9,915
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	14,132	5,512
Investment securities held to maturity:
Investment securities held to maturity		9,929
Corporate Obligations [Member] \| Fair Value [Member]
Financial assets:
Securities available for sale, at fair value	14,132	5,512
Investment securities held to maturity:
Investment securities held to maturity		9,915
Equity Securities [Member]
Financial assets:
Securities available for sale, at fair value	548	519
Equity Securities [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Securities available for sale, at fair value	548	519
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	548	519
Equity Securities [Member] \| Fair Value [Member]
Financial assets:
Securities available for sale, at fair value	$ 548	$ 519