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Loans - Loan Balances (Detail) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023
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Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans | $ 3,104,036 | $ 3,081,230 |  |
Allowance for credit losses | (40,284) | (39,669) | $ (38,849) | $ (37,160)
Net loans | 3,063,752 | 3,041,561 |  |
Loans Receivable [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans | 3,104,036 | 3,081,230 |  |
Allowance for credit losses | (40,284) | (39,669) |  |
Net loans | 3,063,752 | 3,041,561 |  |
Commercial and Agriculture [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans | 330,627 | 328,488 |  |
Allowance for credit losses | (6,194) | (6,586) | (7,737) | (7,587)
Commercial and Agriculture [Member] | Loans Receivable [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans | 330,627 | 328,488 |  |
Commercial Real Estate Owner Occupied [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans | 378,095 | 374,367 |  |
Allowance for credit losses | (4,466) | (4,327) | (4,652) | (4,723)
Commercial Real Estate Owner Occupied [Member] | Loans Receivable [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans | 378,095 | 374,367 |  |
Commercial Real Estate Non Owner Occupied [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans | 1,246,025 | 1,225,991 |  |
Allowance for credit losses | (11,412) | (11,404) | (12,968) | (12,056)
Commercial Real Estate Non Owner Occupied [Member] | Loans Receivable [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans | 1,246,025 | 1,225,991 |  |
Residential Real Estate [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans | 773,349 | 763,869 |  |
Allowance for credit losses | (12,455) | (11,866) | (9,074) | (8,489)
Residential Real Estate [Member] | Loans Receivable [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans | 773,349 | 763,869 |  |
Real Estate Construction [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans | 297,589 | 305,992 |  |
Allowance for credit losses | (4,017) | (3,708) | (3,433) | (3,388)
Real Estate Construction [Member] | Loans Receivable [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans | 297,589 | 305,992 |  |
Farm Real Estate [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans | 22,399 | 23,035 |  |
Allowance for credit losses | (264) | (226) | (320) | (260)
Farm Real Estate [Member] | Loans Receivable [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans | 22,399 | 23,035 |  |
Lease Financing Receivable [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans | 44,570 | 46,900 |  |
Allowance for credit losses | (1,277) | (1,361) | (359) | (297)
Lease Financing Receivable [Member] | Loans Receivable [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans | 44,570 | 46,900 |  |
Consumer and Other [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans | 11,382 | 12,588 |  |
Allowance for credit losses | (199) | (191) | $ (306) | $ (341)
Consumer and Other [Member] | Loans Receivable [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans | $ 11,382 | $ 12,588 |  |

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