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Loans Receivable and Allowance for Loan Losses - Impact of ASC 326 Adoption (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | ---
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |
Allowance for credit losses | $ 101,466 |  | $ 55,525 | $ 55,562 | $ 60,195
Mortgage Portfolio |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |
Allowance for credit losses | 25,511 |  |  |  |
Mortgage Portfolio | Residential |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |
Allowance for credit losses | 3,414 |  |  |  |
Mortgage Portfolio | Commercial |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |
Allowance for credit losses | 12,831 |  |  |  |
Mortgage Portfolio | Multifamily |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |
Allowance for credit losses | 3,374 |  |  |  |
Mortgage Portfolio | Construction |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |
Allowance for credit losses | 5,892 |  |  |  |
Commercial loans |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |
Allowance for credit losses | 27,084 |  | 28,263 | 25,693 |
Consumer loans |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |
Allowance for credit losses | $ 6,075 |  | $ 1,751 | $ 2,191 |
Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |
Allowance for credit losses |  | $ 63,445 |  |  |
Cumulative Effect, Period of Adoption, Adjusted Balance | Mortgage Portfolio |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |
Allowance for credit losses |  | 39,739 |  |  |
Cumulative Effect, Period of Adoption, Adjusted Balance | Mortgage Portfolio | Residential |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |
Allowance for credit losses |  | 8,950 |  |  |
Cumulative Effect, Period of Adoption, Adjusted Balance | Mortgage Portfolio | Commercial |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |
Allowance for credit losses |  | 17,118 |  |  |
Cumulative Effect, Period of Adoption, Adjusted Balance | Mortgage Portfolio | Multifamily |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |
Allowance for credit losses |  | 9,519 |  |  |
Cumulative Effect, Period of Adoption, Adjusted Balance | Mortgage Portfolio | Construction |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |
Allowance for credit losses |  | 4,152 |  |  |
Cumulative Effect, Period of Adoption, Adjusted Balance | Commercial loans |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |
Allowance for credit losses |  | 18,254 |  |  |
Cumulative Effect, Period of Adoption, Adjusted Balance | Consumer loans |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |
Allowance for credit losses |  | 5,452 |  |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |
Allowance for credit losses |  | 7,920 |  |  |
Cumulative Effect, Period of Adoption, Adjustment | Mortgage Portfolio |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |
Allowance for credit losses |  | 14,228 |  |  |
Cumulative Effect, Period of Adoption, Adjustment | Mortgage Portfolio | Residential |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |
Allowance for credit losses |  | 5,536 |  |  |
Cumulative Effect, Period of Adoption, Adjustment | Mortgage Portfolio | Commercial |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |
Allowance for credit losses |  | 4,287 |  |  |
Cumulative Effect, Period of Adoption, Adjustment | Mortgage Portfolio | Multifamily |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |
Allowance for credit losses |  | 6,145 |  |  |
Cumulative Effect, Period of Adoption, Adjustment | Mortgage Portfolio | Construction |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |
Allowance for credit losses |  | (1,740) |  |  |
Cumulative Effect, Period of Adoption, Adjustment | Commercial loans |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |
Allowance for credit losses |  | (10,009) |  |  |
Cumulative Effect, Period of Adoption, Adjustment | Consumer loans |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |
Allowance for credit losses |  | $ 3,701 |  |  |

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- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(2)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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