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Fair Value Measurements (Financial Instruments) (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Financial assets: |  |  |  |
Cash and cash equivalents | $ 148,783 | $ 144,297 | $ 159,674 | $ 102,226
Securities available for sale, at fair value | 1,028,305 | 1,040,386 |  |
Investment securities held to maturity: |  |  |  |
Investment securities held to maturity, fair value | 490,425 | 489,287 |  |
FHLBNY stock | 70,896 | 75,726 |  |
Loans, net of allowance for loan losses | 6,967,776 | 6,941,603 |  |
Financial liabilities: |  |  |  |
Certificates of deposit | 627,868 | 651,183 |  |
Total deposits | 6,591,216 | 6,553,629 |  |
Borrowings | 1,525,560 | 1,612,745 |  |
Derivative liabilities | 2,500 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |
Financial assets: |  |  |  |
Cash and cash equivalents | 148,783 | 144,297 |  |
Securities available for sale, at fair value | 34,627 | 65,745 |  |
Investment securities held to maturity: |  |  |  |
Investment securities held to maturity, fair value | 4,252 | 4,225 |  |
FHLBNY stock | 70,896 | 75,726 |  |
Loans, net of allowance for loan losses | 0 | 0 |  |
Derivative assets | 0 | 0 |  |
Financial liabilities: |  |  |  |
Deposits other than certificates of deposits | 5,963,348 | 5,902,446 |  |
Certificates of deposit | 0 | 0 |  |
Total deposits | 5,963,348 | 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 | 993,678 | 974,641 |  |
Investment securities held to maturity: |  |  |  |
Investment securities held to maturity, fair value | 486,173 | 485,062 |  |
FHLBNY stock | 0 | 0 |  |
Loans, net of allowance for loan losses | 0 | 0 |  |
Derivative assets | 8,035 | 7,441 |  |
Financial liabilities: |  |  |  |
Deposits other than certificates of deposits | 0 | 0 |  |
Certificates of deposit | 628,523 | 653,772 |  |
Total deposits | 628,523 | 653,772 |  |
Borrowings | 1,530,444 | 1,617,023 |  |
Derivative liabilities | 7,595 | 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, fair value | 0 | 0 |  |
FHLBNY stock | 0 | 0 |  |
Loans, net of allowance for loan losses | 6,955,183 | 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 | 148,783 | 144,297 |  |
Securities available for sale, at fair value | 1,028,305 | 1,040,386 |  |
Investment securities held to maturity: |  |  |  |
Investment securities held to maturity, fair value | 481,845 | 488,183 |  |
FHLBNY stock | 70,896 | 75,726 |  |
Loans, net of allowance for loan losses | 6,967,776 | 6,941,603 |  |
Derivative assets | 8,035 | 7,441 |  |
Financial liabilities: |  |  |  |
Deposits other than certificates of deposits | 5,963,348 | 5,902,446 |  |
Certificates of deposit | 627,868 | 651,183 |  |
Total deposits | 6,591,216 | 6,553,629 |  |
Borrowings | 1,525,560 | 1,612,745 |  |
Derivative liabilities | 7,595 | 6,750 |  |
Fair Value [Member] |  |  |  |
Financial assets: |  |  |  |
Cash and cash equivalents | 148,783 | 144,297 |  |
Securities available for sale, at fair value | 1,028,305 | 1,040,386 |  |
Investment securities held to maturity: |  |  |  |
Investment securities held to maturity, fair value | 490,425 | 489,287 |  |
FHLBNY stock | 70,896 | 75,726 |  |
Loans, net of allowance for loan losses | 6,955,183 | 6,924,440 |  |
Derivative assets | 8,035 | 7,441 |  |
Financial liabilities: |  |  |  |
Deposits other than certificates of deposits | 5,963,348 | 5,902,446 |  |
Certificates of deposit | 628,523 | 653,772 |  |
Total deposits | 6,591,871 | 6,556,218 |  |
Borrowings | 1,530,444 | 1,617,023 |  |
Derivative liabilities | 7,595 | 6,750 |  |
U.S. Treasury Obligations [Member] |  |  |  |
Financial assets: |  |  |  |
Securities available for sale, at fair value | 5,994 | 8,008 |  |
U.S. Treasury Obligations [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |
Financial assets: |  |  |  |
Securities available for sale, at fair value | 5,994 | 8,008 |  |
U.S. Treasury Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Financial assets: |  |  |  |
Securities available for sale, at fair value | 0 | 0 |  |
U.S. Treasury Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Financial assets: |  |  |  |
Securities available for sale, at fair value | 0 | 0 |  |
U.S. Treasury Obligations [Member] | Carrying Value [Member] |  |  |  |
Financial assets: |  |  |  |
Securities available for sale, at fair value | 5,994 | 8,008 |  |
U.S. Treasury Obligations [Member] | Fair Value [Member] |  |  |  |
Financial assets: |  |  |  |
Securities available for sale, at fair value | 5,994 | 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 | 28,035 | 57,188 |  |
Investment securities held to maturity: |  |  |  |
Investment securities held to maturity, fair value | 4,252 | 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, fair value | 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, fair value | 0 | 0 |  |
Agency Obligations [Member] | Carrying Value [Member] |  |  |  |
Financial assets: |  |  |  |
Securities available for sale, at fair value | 28,035 | 57,188 |  |
Investment securities held to maturity: |  |  |  |
Investment securities held to maturity, fair value | 4,307 | 4,306 |  |
Agency Obligations [Member] | Fair Value [Member] |  |  |  |
Financial assets: |  |  |  |
Securities available for sale, at fair value | 28,035 | 57,188 |  |
Investment securities held to maturity: |  |  |  |
Investment securities held to maturity, fair value | 4,252 | 4,225 |  |
Mortgage-Backed Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Securities available for sale, at fair value | 968,412 | 951,861 |  |
Investment securities held to maturity: |  |  |  |
Investment securities held to maturity, fair value | 492 | 924 |  |
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, fair value | 0 | 0 |  |
Mortgage-Backed Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Financial assets: |  |  |  |
Securities available for sale, at fair value | 968,412 | 951,861 |  |
Investment securities held to maturity: |  |  |  |
Investment securities held to maturity, fair value | 492 | 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, fair value | 0 | 0 |  |
Mortgage-Backed Securities [Member] | Carrying Value [Member] |  |  |  |
Financial assets: |  |  |  |
Securities available for sale, at fair value | 968,412 | 951,861 |  |
Investment securities held to maturity: |  |  |  |
Investment securities held to maturity, fair value | 475 | 893 |  |
Mortgage-Backed Securities [Member] | Fair Value [Member] |  |  |  |
Financial assets: |  |  |  |
Securities available for sale, at fair value | 968,412 | 951,861 |  |
Investment securities held to maturity: |  |  |  |
Investment securities held to maturity, fair value | 492 | 924 |  |
State And Municipal Obligations [Member] |  |  |  |
Financial assets: |  |  |  |
Securities available for sale, at fair value | 3,807 | 3,743 |  |
Investment securities held to maturity: |  |  |  |
Investment securities held to maturity, fair value | 475,759 | 474,852 |  |
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, fair value | 0 | 0 |  |
State And Municipal Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Financial assets: |  |  |  |
Securities available for sale, at fair value | 3,807 | 3,743 |  |
Investment securities held to maturity: |  |  |  |
Investment securities held to maturity, fair value | 475,759 | 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, fair value | 0 | 0 |  |
State And Municipal Obligations [Member] | Carrying Value [Member] |  |  |  |
Financial assets: |  |  |  |
Securities available for sale, at fair value | 3,807 | 3,743 |  |
Investment securities held to maturity: |  |  |  |
Investment securities held to maturity, fair value | 467,113 | 473,653 |  |
State And Municipal Obligations [Member] | Fair Value [Member] |  |  |  |
Financial assets: |  |  |  |
Securities available for sale, at fair value | 3,807 | 3,743 |  |
Investment securities held to maturity: |  |  |  |
Investment securities held to maturity, fair value | 475,759 | 474,852 |  |
Corporate Obligations [Member] |  |  |  |
Financial assets: |  |  |  |
Securities available for sale, at fair value | 21,459 | 19,037 |  |
Investment securities held to maturity: |  |  |  |
Investment securities held to maturity, fair value | 9,922 | 9,286 |  |
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, fair value | 0 | 0 |  |
Corporate Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Financial assets: |  |  |  |
Securities available for sale, at fair value | 21,459 | 19,037 |  |
Investment securities held to maturity: |  |  |  |
Investment securities held to maturity, fair value | 9,922 | 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, fair value | 0 | 0 |  |
Corporate Obligations [Member] | Carrying Value [Member] |  |  |  |
Financial assets: |  |  |  |
Securities available for sale, at fair value | 21,459 | 19,037 |  |
Investment securities held to maturity: |  |  |  |
Investment securities held to maturity, fair value | 9,950 | 9,331 |  |
Corporate Obligations [Member] | Fair Value [Member] |  |  |  |
Financial assets: |  |  |  |
Securities available for sale, at fair value | 21,459 | 19,037 |  |
Investment securities held to maturity: |  |  |  |
Investment securities held to maturity, fair value | 9,922 | 9,286 |  |
Equity Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Securities available for sale, at fair value | 598 | 549 |  |
Equity Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |
Financial assets: |  |  |  |
Securities available for sale, at fair value | 598 | 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 | 598 | 549 |  |
Equity Securities [Member] | Fair Value [Member] |  |  |  |
Financial assets: |  |  |  |
Securities available for sale, at fair value | $ 598 | $ 549 |  |

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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 of investments in debt securities classified as held-to-maturity. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -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 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + 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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