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Loans (Impaired Loans) - Additional Information (Detail) |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 30, 2021 | Jun. 30, 2021 Loan | Mar. 31, 2021 Loan | May 31, 2020 Loan | Dec. 31, 2021 USD ($) Loan Contract | Dec. 31, 2020 USD ($) Loan | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Additional funds available to be advanced in connection with impaired loans |  |  |  |  | $ 0 |  |  |
Impaired loans classified as troubled debt restructured |  |  |  |  | $ 7,600,000 | $ 6,500 |  |
Number of contracts modified | Loan |  |  |  |  | 3 | 4 |  |
TDR impaired loans paid off | Loan |  | 2 | 3 | 1 |  |  |  |
Term of loan | 5 years |  |  |  | 3 years |  |  |
Loan amortization period |  |  |  |  | 10 years |  |  |
Allowance for loan losses |  |  |  |  | $ 16,242,000 | $ 13,672,000 | $ 7,228,000 | $ 6,775,000
TDR loans, subsequently defaulted during the period |  |  |  |  | 0 | 0 |  |
Maximum time for re-evaluation (in months) |  |  |  |  | 12 months |  |  |
Re-evaluation period for real estate |  |  |  |  | 2 years |  |  |
Unsecured consumer loans, credit card credits and overdraft lines of credit reach |  |  |  |  | 90 days |  |  |
Delinquent period for charging down consumer loans |  |  |  |  | 120 days |  |  |
Delinquent period for charging down commercial and agricultural credits |  |  |  |  | 120 days |  |  |
Foreclosed residential real estate property |  |  |  |  | $ 159,000 | $ 71,000 |  |
Consumer Real Estate [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Foreclosed residential real estate property |  |  |  |  | 159,000 | 71,000 |  |
Residential real estate properties foreclosure proceedings |  |  |  |  | 255,000 | $ 910,000 |  |
Specific Allocation on Principal Balance [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Allowance for loan losses |  |  |  |  | $ 825,000 |  |  |
Principal Forgiveness [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Number of contracts modified | Contract |  |  |  |  | 0 |  |  |
Sale Of Property |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Number of contracts modified | Loan |  |  |  |  | 1 |  |  |
Payment Changes from Monthly Payment to Principal and Interest at Maturity [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Number of contracts modified | Loan |  |  |  |  | 1 | 2 |  |
Allowance for loan losses |  |  |  |  | $ 313,000 |  |  |

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