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Loans (Impaired Loans) - Additional Information (Detail) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2020 Loan | Dec. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) Loan | Dec. 31, 2020 USD ($) Contract | Dec. 31, 2019 USD ($) Contract
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Additional funds available to be advanced in connection with impaired loans |  | $ 750 | $ 750 | $ 750 | $ 750 |
Impaired loans classified as troubled debt restructured |  | $ 6,000 | $ 6,000 | 6,000 | 6,000 | $ 956
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 |  | $ 71 | $ 71 | 71 | 71 | $ 214
Consumer Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Number of contracts modified | Contract |  |  |  |  |  | 1
Foreclosed residential real estate property |  | 71 | 71 | 71 | 71 | $ 50
Residential real estate properties foreclosure proceedings |  | $ 910 | $ 910 | $ 910 | $ 910 | $ 383
Principal Forgiveness [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Number of contracts modified |  |  |  | 4 | 0 | 0
TDR impaired loans paid off | 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 | Contract |  |  |  |  | 2 |
Payment Changes to Interest Only for Extended Maturity [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Number of contracts modified | Contract |  |  |  |  |  | 4
Lowering of Payment to Match Extended Maturity [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Number of contracts modified | Contract |  |  |  |  |  | 1

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