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Loans (Impaired Loans) - Additional Information (Detail) | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) Loan | May 31, 2020 Loan | Jun. 30, 2021 USD ($) Contract Loan | Jun. 30, 2020 USD ($) Loan | Jun. 30, 2021 USD ($) Contract Loan | Jun. 30, 2020 USD ($) Contract Loan | Dec. 31, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Additional funds available to be advanced in connection with impaired loans | $ 5,700 |  | $ 5,700 |  | $ 5,700 |  |
Impaired loans classified as troubled debt restructured | $ 5,500,000 |  | $ 5,500,000 | $ 6,400,000 | $ 5,500,000 | $ 6,400,000 | $ 6,500,000
Number of contracts modified | Loan |  |  | 1 | 3 |  | 5 |
TDR impaired loans paid off | Loan | 2 | 1 |  |  |  |  |
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 |  |  |  |  | 90 days |  |
Delinquent period for charging down commercial and agricultural credits |  |  |  |  | 120 days |  |
Foreclosed residential real estate property | $ 198,000 |  | $ 198,000 |  | $ 198,000 |  | 71,000
Maximum [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Litigation and any deficiency charged off period |  |  |  |  | 150 days |  |
Commercial Real Estate [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Impaired loans classified as troubled debt restructured | 86,000 |  | $ 86,000 | $ 481,000 | $ 86,000 | $ 481,000 |
Number of contracts modified | Contract |  |  | 1 |  | 1 | 2 |
TDR impaired loans paid off | Loan |  |  |  |  | 1 | 1 |
Commercial and Industrial [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Impaired loans classified as troubled debt restructured | 480,000 |  | $ 480,000 |  | $ 480,000 |  |
TDR impaired loans paid off | Loan |  |  |  |  | 1 |  |
TDR impaired loans charged off | Loan |  |  |  |  | 3 |  |
TDR impaired loans charged off amount |  |  |  |  | $ 809,000 |  |
Consumer Real Estate [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Foreclosed residential real estate property | 198,000 |  | 198,000 | 0 | 198,000 | $ 0 | 71,000
Residential real estate properties foreclosure proceedings | $ 100,000 |  | $ 100,000 | $ 854,000 | $ 100,000 | $ 854,000 | $ 910,000
Principal Forgiveness [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Number of contracts modified | Contract |  |  |  |  | 0 |  |

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