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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 |  |

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 325 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75031641&loc=d3e63345-112809 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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