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Loans - Troubled Debt Restructurings (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Nonaccrual TDRs |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | $ 15,189 | $ 17,065
Nonaccrual TDRs | Real Estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | 15,050 | 16,921
Nonaccrual TDRs | Commercial and Industrial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | 139 | 144
Nonaccrual TDRs | Deferral of Principal |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | 446 | 1,095
Nonaccrual TDRs | Deferral of Principal | Real Estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | 446 | 1,095
Nonaccrual TDRs | Deferral of Principal and Interest |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | 3,269 | 3,478
Nonaccrual TDRs | Deferral of Principal and Interest | Real Estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | 3,130 | 3,334
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 | 139 | 144
Nonaccrual TDRs | Reduction of Principal and Interest |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | 11,474 | 12,492
Nonaccrual TDRs | Reduction of Principal and Interest | Real Estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | 11,474 | 12,492
Accrual TDRs |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | 8,407 | 7,930
Accrual TDRs | Real Estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | 8,363 | 7,870
Accrual TDRs | Commercial and Industrial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | 44 | 60
Accrual TDRs | Deferral of Principal |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | 1,103 | 513
Accrual TDRs | Deferral of Principal | Real Estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | 1,103 | 513
Accrual TDRs | Reduction of Principal and Interest |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | 3 | 71
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
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 | 3 | 4
Accrual TDRs | Extension of Maturity |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | 7,301 | 7,346
Accrual TDRs | Extension of Maturity | Real Estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | 7,260 | 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 | $ 41 | $ 56

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