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Loans (Impaired Loans) - Additional Information (Detail) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 30, 2021 | Jun. 30, 2021 USD ($) Loan | Jun. 30, 2022 USD ($) Loan | Jun. 30, 2021 USD ($) Loan Contract | Jun. 30, 2022 USD ($) Loan Contract | Jun. 30, 2021 USD ($) Loan Contract | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Additional funds available to be advanced in connection with impaired loans |  |  | $ 0 |  | $ 0 |  |  |
Impaired loans classified as troubled debt restructured |  | $ 5,500,000 | $ 2,700,000 | $ 5,500,000 | 2,700,000 | $ 5,500,000 | $ 7,600,000 |
Number of contracts modified | Loan |  |  | 0 | 1 |  |  |  |
TDR impaired loans paid off | Loan |  | 2 |  |  |  |  |  |
Term of loan | 5 years |  |  |  |  |  |  |
Allowance for loan losses |  |  | $ 18,424,000 |  | $ 18,424,000 |  | 16,242,000 | $ 13,672,000
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 |  |  |  |  | 90 days |  |  |
Delinquent period for charging down/allocated commercial and agricultural credits |  |  |  |  | 120 days |  |  |
Foreclosed residential real estate property |  |  |  |  |  |  | 159,000 |
Maximum [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Litigation and any deficiency charged off period |  |  |  |  | 150 days |  |  |
Agricultural Real Estate [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Impaired loans classified as troubled debt restructured |  |  | $ 4,500,000 |  | $ 4,500,000 |  |  |
TDR impaired loans paid off | Loan |  |  |  |  | 2 |  |  |
Commercial and Industrial [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Impaired loans classified as troubled debt restructured |  |  | 480,000 |  | $ 480,000 |  |  |
TDR impaired loans paid off | Loan |  |  |  |  | 1 |  |  |
Allowance for loan losses |  |  | 0 |  | $ 0 |  |  |
TDR impaired loans charged off | Loan |  |  |  |  |  | 3 |  |
TDR impaired loans charged off amount |  |  |  |  |  | $ 809,000 |  |
Commercial Real Estate [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Impaired loans classified as troubled debt restructured |  |  | 86,000 |  | $ 86,000 |  |  |
Number of contracts modified | Contract |  |  |  | 1 |  | 1 |  |
TDR impaired loans paid off | Loan |  |  |  |  | 1 |  |  |
Consumer Real Estate [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Foreclosed residential real estate property |  | $ 198,000 | 0 | $ 198,000 | $ 0 | $ 198,000 | 159,000 |
Residential real estate properties foreclosure proceedings |  | $ 100,000 | $ 72,000 | $ 100,000 | $ 72,000 | $ 100,000 | $ 255,000 |
Principal Forgiveness [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Number of contracts modified | Contract |  |  |  |  | 0 |  |  |

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