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Loans (Impaired Loans) - Additional Information (Detail) |  | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 30, 2021 | Jun. 30, 2023 USD ($) Contract | Jun. 30, 2022 USD ($) Contract Loan | Jun. 30, 2023 USD ($) Contract | Jun. 30, 2022 USD ($) Contract | Mar. 31, 2023 USD ($) | Jan. 01, 2023 USD ($) | Dec. 31, 2022 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Impaired loans classified as troubled debt restructured |  |  | $ 2,700,000 |  | $ 2,700,000 |  |  | $ 3,600,000
Number of contracts modified |  | 1 | 0 |  |  |  |  |
Term of loan | 5 years |  |  |  |  |  |  |
Allowance for loan losses |  | $ 24,910,000 |  | $ 24,910,000 |  | $ 24,634,000 |  | 20,313,000
Modifications to borrower experiencing financial difficulty | Contract |  | 0 | 0 | 0 | 0 |  |  |
Increase in loan |  | $ 411,000 |  |  |  |  |  |
Additional funds advanced with imapired loans |  | 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 |  |  |  |
Litigation and any deficiency charged off period |  |  |  | 150 days |  |  |  |
Delinquent period for charging down/allocated commercial and agricultural credits |  |  |  | 120 days |  |  |  |
Agricultural Real Estate [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Allowance for loan losses |  | 237,000 |  | $ 237,000 |  | 209,000 |  | 349,000
Commercial Real Estate [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Allowance for loan losses |  | 16,681,000 |  | 16,681,000 |  | 16,088,000 |  | 11,924,000
Consumer Real Estate [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Allowance for loan losses |  | 3,998,000 |  | 3,998,000 |  | $ 3,623,000 |  | 998,000
Foreclosed residential real estate property |  | 0 | $ 0 | 0 | $ 0 |  |  | 0
Residential real estate properties foreclosure proceedings |  | $ 95,000 | $ 72,000 | $ 95,000 | $ 72,000 |  |  | $ 170,000
ASU 2016-13 [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Allowance for credit losses and unfunded commitment liability |  |  |  |  |  |  | $ 4,500,000 |
Allowance for redit losses and unfunded commitment liability, net of tax |  |  |  |  |  |  | $ 3,400,000 |
Principal Forgiveness [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Number of contracts modified | Contract |  | 0 |  | 0 |  |  |  |

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