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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 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, Carrying and Fair Values (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 190,834	$ 144,297	$ 102,226	$ 103,762
Securities available for sale	1,037,812	1,040,386
Investment securities held to maturity	477,652	488,183
FHLBNY stock	81,184	75,726
Loans, net of allowance for loan losses	7,265,523	6,941,603
Certificates of deposit	634,809	651,183
Total deposits	6,714,166	6,553,629
Borrowings	1,742,514	1,612,745
US Treasury obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale		8,008
Mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale	988,367	951,861
State and municipal obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale	3,388	3,743
Corporate obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale	26,394	19,037
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	190,834	144,297
Securities available for sale	1,037,812	1,040,386
Investment securities held to maturity	477,652	488,183
FHLBNY stock	81,184	75,726
Loans, net of allowance for loan losses	7,265,523	6,941,603
Derivative assets	7,219	7,441
Deposits other than certificates of deposits	6,079,357	5,902,446
Certificates of deposit	634,809	651,183
Total deposits	6,714,166	6,553,629
Borrowings	1,742,514	1,612,745
Derivative liabilities	6,315	6,750
Carrying Value [Member] \| US Treasury obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale		8,008
Carrying Value [Member] \| Agency obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale	19,005	57,188
Investment securities held to maturity	4,308	4,306
Carrying Value [Member] \| Mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale	988,367	951,861
Investment securities held to maturity	382	893
Carrying Value [Member] \| State and municipal obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale	3,388	3,743
Investment securities held to maturity	462,942	473,653
Carrying Value [Member] \| Corporate obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale	26,394	19,037
Investment securities held to maturity	10,020	9,331
Carrying Value [Member] \| Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale	658	549
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	190,834	144,297
Securities available for sale	1,037,812	1,040,386
Investment securities held to maturity	485,039	489,287
FHLBNY stock	81,184	75,726
Loans, net of allowance for loan losses	7,217,705	6,924,440
Derivative assets	7,219	7,441
Deposits other than certificates of deposits	6,079,357	5,902,446
Certificates of deposit	632,744	653,772
Total deposits	6,712,101	6,556,218
Borrowings	1,739,102	1,617,023
Derivative liabilities	6,315	6,750
Fair Value [Member] \| Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	190,834	144,297
Securities available for sale	19,663	65,745
Investment securities held to maturity	4,221	4,225
FHLBNY stock	81,184	75,726
Loans, net of allowance for loan losses	0	0
Derivative assets	0
Deposits other than certificates of deposits	6,079,357	5,902,446
Certificates of deposit	0	0
Total deposits	6,079,357	5,902,446
Borrowings	0	0
Derivative liabilities	0
Fair Value [Member] \| Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Securities available for sale	1,018,149	974,641
Investment securities held to maturity	480,818	485,062
FHLBNY stock	0	0
Loans, net of allowance for loan losses	0	0
Derivative assets	7,219	7,441
Deposits other than certificates of deposits	0	0
Certificates of deposit	632,744	653,772
Total deposits	632,744	653,772
Borrowings	1,739,102	1,617,023
Derivative liabilities	6,315	6,750
Fair Value [Member] \| Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Securities available for sale	0	0
Investment securities held to maturity	0	0
FHLBNY stock	0	0
Loans, net of allowance for loan losses	7,217,705	6,924,440
Derivative assets	0
Deposits other than certificates of deposits	0	0
Certificates of deposit	0	0
Total deposits	0	0
Borrowings	0	0
Derivative liabilities	0
Fair Value [Member] \| US Treasury obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale		8,008
Fair Value [Member] \| US Treasury obligations [Member] \| Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale		8,008
Fair Value [Member] \| US Treasury obligations [Member] \| Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale		0
Fair Value [Member] \| US Treasury obligations [Member] \| Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale		0
Fair Value [Member] \| Agency obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale	19,005	57,188
Investment securities held to maturity	4,221	4,225
Fair Value [Member] \| Agency obligations [Member] \| Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale	19,005	57,188
Investment securities held to maturity	4,221	4,225
Fair Value [Member] \| Agency obligations [Member] \| Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale	0	0
Investment securities held to maturity	0	0
Fair Value [Member] \| Agency obligations [Member] \| Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale	0	0
Investment securities held to maturity	0	0
Fair Value [Member] \| Mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale	988,367	951,861
Investment securities held to maturity	396	924
Fair Value [Member] \| Mortgage-backed securities [Member] \| Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale	0	0
Investment securities held to maturity	0	0
Fair Value [Member] \| Mortgage-backed securities [Member] \| Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale	988,367	951,861
Investment securities held to maturity	396	924
Fair Value [Member] \| Mortgage-backed securities [Member] \| Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale	0	0
Investment securities held to maturity	0	0
Fair Value [Member] \| State and municipal obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale	3,388	3,743
Investment securities held to maturity	470,484	474,852
Fair Value [Member] \| State and municipal obligations [Member] \| Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale	0	0
Investment securities held to maturity	0	0
Fair Value [Member] \| State and municipal obligations [Member] \| Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale	3,388	3,743
Investment securities held to maturity	470,484	474,852
Fair Value [Member] \| State and municipal obligations [Member] \| Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale	0	0
Investment securities held to maturity	0	0
Fair Value [Member] \| Corporate obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale	26,394	19,037
Investment securities held to maturity	9,938	9,286
Fair Value [Member] \| Corporate obligations [Member] \| Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale	0	0
Investment securities held to maturity	0	0
Fair Value [Member] \| Corporate obligations [Member] \| Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale	26,394	19,037
Investment securities held to maturity	9,938	9,286
Fair Value [Member] \| Corporate obligations [Member] \| Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale	0	0
Investment securities held to maturity	0	0
Fair Value [Member] \| Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale	658	549
Fair Value [Member] \| Equity Securities [Member] \| Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale	658	549
Fair Value [Member] \| Equity Securities [Member] \| Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale	0	0
Fair Value [Member] \| Equity Securities [Member] \| Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale	$ 0	$ 0