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Loans Receivable and Allowance for Loan Losses - Schedule of Troubled Debt Restructurings (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) SecurityLoan | Dec. 31, 2019 USD ($) SecurityLoan
Financing Receivable, Recorded Investment [Line Items] |  |
Number of Loans | SecurityLoan | 6 | 14
Pre-Modification Outstanding Recorded Investment | $ 3,149 | $ 18,044
Post-Modification Outstanding Recorded Investment | $ 3,006 | $ 17,884
Mortgage loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Number of Loans | SecurityLoan | 2 | 4
Pre-Modification Outstanding Recorded Investment | $ 434 | $ 15,627
Post-Modification Outstanding Recorded Investment | $ 360 | $ 15,594
Mortgage loans | Residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Number of Loans | SecurityLoan | 2 | 3
Pre-Modification Outstanding Recorded Investment | $ 434 | $ 1,617
Post-Modification Outstanding Recorded Investment | $ 360 | $ 1,584
Mortgage loans | Commercial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Number of Loans | SecurityLoan |  | 1
Pre-Modification Outstanding Recorded Investment |  | $ 14,010
Post-Modification Outstanding Recorded Investment |  | $ 14,010
Commercial loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Number of Loans | SecurityLoan | 4 | 6
Pre-Modification Outstanding Recorded Investment | $ 2,715 | $ 1,996
Post-Modification Outstanding Recorded Investment | $ 2,646 | $ 1,888
Consumer loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Number of Loans | SecurityLoan |  | 4
Pre-Modification Outstanding Recorded Investment |  | $ 421
Post-Modification Outstanding Recorded Investment |  | $ 402

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524 + Details
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- Definition Amount, after troubled debt restructuring, of modified financing receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524 + Details
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- Definition Amount, before troubled debt restructuring, of financing receivable to be modified. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524 + Details
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