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Loans - Loans (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Loans: |  |  |  |  |  |
Loans - Gross | $ 2,659,727 |  | $ 2,562,545 |  |  |
Less: Net deferred loan fees and costs | (1,452) |  | (1,750) |  |  |
Loans after net deferred loan fees and costs | 2,658,275 |  | 2,560,795 |  |  |
Less: Allowance for credit losses | (27,475) | $ (26,977) | (25,826) | $ (25,484) | $ (25,270) | $ (25,024)
Plus: Basis adjustment related to fair value hedges | 1,868 |  | 1,074 |  |  |
Loans - Net | 2,632,668 |  | 2,536,043 |  |  |
Consumer Real Estate [Member] |  |  |  |  |  |
Loans: |  |  |  |  |  |
Loans - Gross | 522,416 |  | 520,114 |  |  |
Less: Allowance for credit losses | (4,129) | (3,653) | (3,543) | (3,363) | (3,201) | (3,581)
Agricultural Real Estate [Member] |  |  |  |  |  |
Loans: |  |  |  |  |  |
Loans - Gross | 222,145 |  | 216,401 |  |  |
Less: Allowance for credit losses | (756) | (738) | (895) | (937) | (926) | (312)
Agricultural [Member] |  |  |  |  |  |
Loans: |  |  |  |  |  |
Loans - Gross | 179,361 |  | 152,080 |  |  |
Less: Allowance for credit losses | (416) | (334) | (285) | (261) | (285) | (336)
Commercial Real Estate [Member] |  |  |  |  |  |
Loans: |  |  |  |  |  |
Loans - Gross | 1,355,166 |  | 1,310,811 |  |  |
Less: Allowance for credit losses | (16,901) | (17,354) | (16,560) | (16,455) | (16,319) | (17,400)
Commercial and Industrial [Member] |  |  |  |  |  |
Loans: |  |  |  |  |  |
Loans - Gross | 296,084 |  | 275,152 |  |  |
Consumer [Member] |  |  |  |  |  |
Loans: |  |  |  |  |  |
Loans - Gross | 60,469 |  | 63,009 |  |  |
Less: Allowance for credit losses | (969) | $ (945) | (1,012) | $ (1,086) | $ (1,172) | $ (1,302)
Other Loan [Member] |  |  |  |  |  |
Loans: |  |  |  |  |  |
Loans - Gross | $ 24,086 |  | $ 24,978 |  |  |

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