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Loans Receivable - Troubled Debt Restructurings, Disaggregated by Type of Concession and by Loan Type (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Nonaccrual TDRs |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | $ 17,065 | $ 55,478
Nonaccrual TDRs | Real Estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | 16,921 | 42,487
Nonaccrual TDRs | Commercial and Industrial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | 144 | 12,991
Nonaccrual TDRs | Deferral of Principal |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | 1,095 | 689
Nonaccrual TDRs | Deferral of Principal | Real Estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | 1,095 | 689
Nonaccrual TDRs | Deferral of Principal and Interest |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | 3,478 | 285
Nonaccrual TDRs | Deferral of Principal and Interest | Real Estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | 3,334 | 132
Nonaccrual TDRs | Deferral of Principal and Interest | Commercial and Industrial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | 144 | 153
Nonaccrual TDRs | Reduction of Principal and Interest |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | 12,492 | 40,266
Nonaccrual TDRs | Reduction of Principal and Interest | Real Estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | 12,492 | 27,740
Nonaccrual TDRs | Reduction of Principal and Interest | Commercial and Industrial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend |  | 12,527
Nonaccrual TDRs | Extension of Maturity |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend |  | 14,238
Nonaccrual TDRs | Extension of Maturity | Real Estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend |  | 13,926
Nonaccrual TDRs | Extension of Maturity | Commercial and Industrial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend |  | 312
Accrual TDRs |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | 7,930 | 830
Accrual TDRs | Real Estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | 7,870 | 608
Accrual TDRs | Commercial and Industrial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | 60 | 222
Accrual TDRs | Deferral of Principal |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | 513 | 531
Accrual TDRs | Deferral of Principal | Real Estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | 513 | 531
Accrual TDRs | Deferral of Principal and Interest |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend |  | 36
Accrual TDRs | Deferral of Principal and Interest | Commercial and Industrial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend |  | 36
Accrual TDRs | Reduction of Principal and Interest |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | 71 | 148
Accrual TDRs | Reduction of Principal and Interest | Real Estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | 67 | 77
Accrual TDRs | Reduction of Principal and Interest | Commercial and Industrial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | 4 | 71
Accrual TDRs | Extension of Maturity |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | 7,346 | 114
Accrual TDRs | Extension of Maturity | Real Estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | 7,290 |
Accrual TDRs | Extension of Maturity | Commercial and Industrial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | $ 56 | $ 114

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