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Loans (Impaired Loans) - Additional Information (Detail) |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 30, 2021 | Sep. 30, 2023 USD ($) Contract | Sep. 30, 2022 USD ($) Contract | Sep. 30, 2023 USD ($) Contract | Jun. 30, 2023 USD ($) | Jan. 01, 2023 USD ($) | Dec. 31, 2022 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Impaired loans classified as troubled debt restructured |  |  | $ 4,000,000 |  |  |  | $ 3,600,000
Number of contracts modified | Contract |  | 0 | 3 |  |  |  |
Term of loan | 5 years |  |  |  |  |  |
Allowance for loan losses |  | $ 25,277,000 |  | $ 25,277,000 | $ 24,910,000 |  | 20,313,000
Modifications to borrower experiencing financial difficulty | Contract |  | 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 |  |  |
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 |  | $ 315,000 |  | $ 315,000 | 237,000 |  | 349,000
Commercial Real Estate [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Allowance for loan losses |  | 16,805,000 |  | 16,805,000 | 16,681,000 |  | 11,924,000
Consumer Real Estate [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Allowance for loan losses |  | 3,842,000 |  | 3,842,000 | $ 3,998,000 |  | 998,000
Foreclosed residential real estate property |  | 0 | $ 0 | 0 |  |  | $ 0
Residential real estate properties foreclosure proceedings |  | $ 92,000 | $ 211,000 | $ 92,000 |  |  |
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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