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Loans - Loan Balances (Detail) - USD ($) $ in Thousands | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total loans | $ 3,151,124 |  | $ 3,081,230 |  |  |
Allowance for credit losses | (40,455) | $ (40,284) | (39,669) | $ (39,919) | $ (38,849) | $ (37,160)
Net loans | 3,110,669 |  | 3,041,561 |  |  |
Loans Receivable [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total loans | 3,151,124 |  | 3,081,230 |  |  |
Allowance for credit losses | (40,455) |  | (39,669) |  |  |
Net loans | 3,110,669 |  | 3,041,561 |  |  |
Commercial and Agriculture [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total loans | 338,598 |  | 328,488 |  |  |
Allowance for credit losses | (6,057) | (6,194) | (6,586) | (5,348) | (7,737) | (7,587)
Commercial and Agriculture [Member] | Loans Receivable [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total loans | 338,598 |  | 328,488 |  |  |
Commercial Real Estate Owner Occupied [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total loans | 378,248 |  | 374,367 |  |  |
Allowance for credit losses | (4,612) | (4,466) | (4,327) | (4,328) | (4,652) | (4,723)
Commercial Real Estate Owner Occupied [Member] | Loans Receivable [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total loans | 378,248 |  | 374,367 |  |  |
Commercial Real Estate Non Owner Occupied [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total loans | 1,263,612 |  | 1,225,991 |  |  |
Allowance for credit losses | (11,321) | (11,412) | (11,404) | (14,421) | (12,968) | (12,056)
Commercial Real Estate Non Owner Occupied [Member] | Loans Receivable [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total loans | 1,263,612 |  | 1,225,991 |  |  |
Residential Real Estate [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total loans | 815,408 |  | 763,869 |  |  |
Allowance for credit losses | (13,075) | (12,455) | (11,866) | (9,416) | (9,074) | (8,489)
Residential Real Estate [Member] | Loans Receivable [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total loans | 815,408 |  | 763,869 |  |  |
Real Estate Construction [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total loans | 277,643 |  | 305,992 |  |  |
Allowance for credit losses | (3,695) | (4,017) | (3,708) | (3,647) | (3,433) | (3,388)
Real Estate Construction [Member] | Loans Receivable [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total loans | 277,643 |  | 305,992 |  |  |
Farm Real Estate [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total loans | 23,866 |  | 23,035 |  |  |
Allowance for credit losses | (305) | (264) | (226) | (261) | (320) | (260)
Farm Real Estate [Member] | Loans Receivable [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total loans | 23,866 |  | 23,035 |  |  |
Lease Financing Receivable [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total loans | 42,758 |  | 46,900 |  |  |
Allowance for credit losses | (1,214) | (1,277) | (1,361) | (2,210) | (359) | (297)
Lease Financing Receivable [Member] | Loans Receivable [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total loans | 42,758 |  | 46,900 |  |  |
Consumer and Other [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total loans | 10,991 |  | 12,588 |  |  |
Allowance for credit losses | (176) | $ (199) | (191) | $ (268) | $ (306) | $ (341)
Consumer and Other [Member] | Loans Receivable [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total loans | $ 10,991 |  | $ 12,588 |  |  |

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