Quarterly report pursuant to Section 13 or 15(d)

Loans - Troubled Debt Restructurings (Detail)

v3.21.2
Loans - Troubled Debt Restructurings (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Nonaccrual TDRs    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend $ 10,716 $ 17,065
Nonaccrual TDRs | Real Estate    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 10,586 16,921
Nonaccrual TDRs | Commercial and Industrial    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 130 144
Nonaccrual TDRs | Deferral of Principal    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 393 1,095
Nonaccrual TDRs | Deferral of Principal | Real Estate    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 393 1,095
Nonaccrual TDRs | Deferral of Principal and Interest    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 2,886 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 2,756 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 130 144
Nonaccrual TDRs | Reduction of Principal and Interest    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 7,437 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 7,437 12,492
Accrual TDRs    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 571 7,930
Accrual TDRs | Real Estate    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 559 7,870
Accrual TDRs | Commercial and Industrial    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 12 60
Accrual TDRs | Deferral of Principal    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 559 513
Accrual TDRs | Deferral of Principal | Real Estate    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 559 513
Accrual TDRs | Reduction of Principal and Interest    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 1 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 1 4
Accrual TDRs | Extension of Maturity    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 11 7,346
Accrual TDRs | Extension of Maturity | Real Estate    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend   7,290
Accrual TDRs | Extension of Maturity | Commercial and Industrial    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend $ 11 $ 56