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Fair Value Measurements - Schedule of Financial Instruments, Carrying and Fair Values (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Available for sale debt securities, at fair value | $ 1,105,489 | $ 976,919
Investment securities held to maturity | 450,965 | 453,629
FHLBNY stock | 59,489 | 57,298
Equity securities, at fair value | 971 | 825
Loans, net of allowance for credit losses | 9,721,424 | 7,277,360
Certificates of deposit | 1,094,174 | 734,027
Total deposits | 9,837,829 | 7,102,609
Borrowings | 1,175,972 | 1,125,146
Subordinated debentures | 25,135 | 0
Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
FHLBNY stock |  | 57,298
Equity securities, at fair value | 971 |
Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
FHLBNY stock |  | 0
Equity securities, at fair value | 0 |
Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
FHLBNY stock |  | 0
Equity securities, at fair value | 0 |
Mortgage-backed securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Available for sale debt securities, at fair value | 938,413 | 947,430
Investment securities held to maturity | 62 |
Asset-backed securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Available for sale debt securities, at fair value | 53,830 |
State and municipal obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Available for sale debt securities, at fair value | 71,258 | 4,079
Corporate obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Available for sale debt securities, at fair value | 40,979 | 25,410
Carrying Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 532,353 | 186,748
Available for sale debt securities, at fair value | 1,105,489 | 976,919
Investment securities held to maturity | 450,965 | 453,629
FHLBNY stock | 59,489 | 57,298
Equity securities, at fair value | 971 | 825
Loans, net of allowance for credit losses | 9,721,424 | 7,277,360
Derivative assets | 101,079 | 39,305
Deposits other than certificates of deposits | 8,743,655 | 6,368,582
Certificates of deposit | 1,094,174 | 734,027
Total deposits | 9,837,829 | 7,102,609
Borrowings | 1,175,972 | 1,125,146
Subordinated debentures | 25,135 |
Derivative liabilities | 109,148 | 39,356
Carrying Value | Agency obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Available for sale debt securities, at fair value | 1,009 |
Investment securities held to maturity | 7,600 | 6,599
Carrying Value | Mortgage-backed securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Available for sale debt securities, at fair value | 938,413 | 947,430
Investment securities held to maturity | 62 | 118
Carrying Value | Asset-backed securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Available for sale debt securities, at fair value | 53,830 |
Carrying Value | State and municipal obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Available for sale debt securities, at fair value | 71,258 | 4,079
Investment securities held to maturity | 433,589 | 437,074
Carrying Value | Corporate obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Available for sale debt securities, at fair value | 40,979 | 25,410
Investment securities held to maturity | 9,714 | 9,838
Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 532,353 | 186,748
Available for sale debt securities, at fair value | 1,105,489 | 976,919
Investment securities held to maturity | 472,451 | 467,966
FHLBNY stock | 59,489 | 57,298
Equity securities, at fair value | 971 | 825
Loans, net of allowance for credit losses | 9,969,330 | 7,296,744
Derivative assets | 101,079 | 39,305
Deposits other than certificates of deposits | 8,743,655 | 6,368,582
Certificates of deposit | 1,097,993 | 734,047
Total deposits | 9,841,648 | 7,102,629
Borrowings | 1,193,024 | 1,127,569
Subordinated debentures | 24,375 |
Derivative liabilities | 109,148 | 39,356
Fair Value | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 532,353 | 186,748
Available for sale debt securities, at fair value | 1,009 | 0
Investment securities held to maturity | 7,601 | 6,601
FHLBNY stock | 59,489 |
Equity securities, at fair value |  | 825
Loans, net of allowance for credit losses | 0 | 0
Derivative assets | 0 | 0
Deposits other than certificates of deposits | 8,743,655 | 6,368,582
Certificates of deposit | 0 | 0
Total deposits | 8,743,655 | 6,368,582
Borrowings | 0 | 0
Derivative liabilities | 0 | 0
Fair Value | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 0 | 0
Available for sale debt securities, at fair value | 1,104,480 | 976,919
Investment securities held to maturity | 464,850 | 461,365
FHLBNY stock | 0 |
Equity securities, at fair value |  | 0
Loans, net of allowance for credit losses | 0 | 0
Derivative assets | 101,079 | 39,305
Deposits other than certificates of deposits | 0 | 0
Certificates of deposit | 1,097,993 | 734,047
Total deposits | 1,097,993 | 734,047
Borrowings | 1,193,024 | 1,127,569
Subordinated debentures | 24,375 |
Derivative liabilities | 109,148 | 39,356
Fair Value | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 0 | 0
Available for sale debt securities, at fair value | 0 | 0
Investment securities held to maturity | 0 | 0
FHLBNY stock | 0 |
Equity securities, at fair value |  | 0
Loans, net of allowance for credit losses | 9,969,330 | 7,296,744
Derivative assets | 0 | 0
Deposits other than certificates of deposits | 0 | 0
Certificates of deposit | 0 | 0
Total deposits | 0 | 0
Borrowings | 0 | 0
Derivative liabilities | 0 | 0
Fair Value | Agency obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Available for sale debt securities, at fair value | 1,009 |
Investment securities held to maturity | 7,601 | 6,601
Fair Value | Agency obligations | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Available for sale debt securities, at fair value | 1,009 |
Investment securities held to maturity | 7,601 | 6,601
Fair Value | Agency obligations | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Available for sale debt securities, at fair value | 0 |
Investment securities held to maturity | 0 | 0
Fair Value | Agency obligations | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Available for sale debt securities, at fair value | 0 |
Investment securities held to maturity | 0 | 0
Fair Value | Mortgage-backed securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Available for sale debt securities, at fair value | 938,413 | 947,430
Investment securities held to maturity | 64 | 122
Fair Value | Mortgage-backed securities | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Available for sale debt securities, at fair value | 0 | 0
Investment securities held to maturity | 0 | 0
Fair Value | Mortgage-backed securities | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Available for sale debt securities, at fair value | 938,413 | 947,430
Investment securities held to maturity | 64 | 122
Fair Value | Mortgage-backed securities | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Available for sale debt securities, at fair value | 0 | 0
Investment securities held to maturity | 0 | 0
Fair Value | Asset-backed securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Available for sale debt securities, at fair value | 53,830 |
Fair Value | Asset-backed securities | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Available for sale debt securities, at fair value | 53,830 |
Fair Value | State and municipal obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Available for sale debt securities, at fair value | 71,258 | 4,079
Investment securities held to maturity | 454,973 | 451,353
Fair Value | State and municipal obligations | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Available for sale debt securities, at fair value | 0 | 0
Investment securities held to maturity | 0 | 0
Fair Value | State and municipal obligations | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Available for sale debt securities, at fair value | 71,258 | 4,079
Investment securities held to maturity | 454,973 | 451,353
Fair Value | State and municipal obligations | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Available for sale debt securities, at fair value | 0 | 0
Investment securities held to maturity | 0 | 0
Fair Value | Corporate obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Available for sale debt securities, at fair value | 40,979 | 25,410
Investment securities held to maturity | 9,813 | 9,890
Fair Value | Corporate obligations | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Available for sale debt securities, at fair value | 0 | 0
Investment securities held to maturity | 0 | 0
Fair Value | Corporate obligations | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Available for sale debt securities, at fair value | 40,979 | 25,410
Investment securities held to maturity | 9,813 | 9,890
Fair Value | Corporate obligations | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Available for sale debt securities, at fair value | 0 | 0
Investment securities held to maturity | $ 0 | $ 0

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=120391452&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://fasb.org/us-gaap/role/ref/legacyRef -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=120398452&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 + 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://fasb.org/us-gaap/role/ref/legacyRef -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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 + Details
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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + 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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=120398452&loc=d3e534808-122878 + Details
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