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Loans Receivable - Summary of Loans by Class Modified as Troubled Debt Restructurings (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) Loan | Dec. 31, 2019 USD ($) Loan | Dec. 31, 2018 USD ($) Loan
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Loans | Loan | 5 | 8 | 2
Pre- Modification Outstanding Recorded Investment | $ 4,479 | $ 54,071 | $ 684
Post- Modification Outstanding Recorded Investment | $ 3,676 | $ 54,892 | $ 664
Real Estate |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Loans | Loan | 5 | 6 |
Pre- Modification Outstanding Recorded Investment | $ 4,479 | $ 41,292 |
Post- Modification Outstanding Recorded Investment | $ 3,676 | $ 42,329 |
Commercial and Industrial Loans |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Loans | Loan |  | 2 | 2
Pre- Modification Outstanding Recorded Investment |  | $ 12,779 | $ 684
Post- Modification Outstanding Recorded Investment |  | $ 12,562 | $ 664

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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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