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Loans and Allowance For Credit Losses - Additional Information (Detail)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Loans
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Interest forgone on nonaccrual loans $ 31,000 $ 23,000 $ 84,000 $ 168,000  
Financing Receivable, Troubled Debt Restructuring 0   $ 0   $ 0
Financing Receivable, Modifications, Number of Contracts | Loans     0   0
Increase Decrease In Allowance For Loan And Lease Losses $ 0 $ 0 $ 0 $ 0