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Loans - Loan Balances (Detail) - USD ($) $ in Thousands | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total loans | $ 3,043,946 |  | $ 2,861,728 |  |  |
Allowance for credit losses | (41,268) | $ (39,919) | (37,160) | $ (35,280) | $ (35,149) | $ (28,511)
Net loans | 3,002,678 |  | 2,824,568 |  |  |
Loans Receivable [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total loans | 3,043,946 |  | 2,861,728 |  |  |
Allowance for credit losses | (41,268) |  | (37,160) |  |  |
Net loans | 3,002,678 |  | 2,824,568 |  |  |
Commercial and Agriculture [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total loans | 304,639 |  | 304,793 |  |  |
Allowance for credit losses | (5,079) | (5,348) | (7,587) | (5,156) | (5,540) | (3,011)
Commercial and Agriculture [Member] | Loans Receivable [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total loans | 304,639 |  | 304,793 |  |  |
Commercial Real Estate Owner Occupied [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total loans | 375,751 |  | 377,321 |  |  |
Allowance for credit losses | (4,365) | (4,328) | (4,723) | (5,481) | (5,531) | (4,565)
Commercial Real Estate Owner Occupied [Member] | Loans Receivable [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total loans | 375,751 |  | 377,321 |  |  |
Commercial Real Estate Non Owner Occupied [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total loans | 1,205,453 |  | 1,161,894 |  |  |
Allowance for credit losses | (14,547) | (14,421) | (12,056) | (11,555) | (11,646) | (14,138)
Commercial Real Estate Non Owner Occupied [Member] | Loans Receivable [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total loans | 1,205,453 |  | 1,161,894 |  |  |
Residential Real Estate [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total loans | 751,825 |  | 659,841 |  |  |
Allowance for credit losses | (10,722) | (9,416) | (8,489) | (6,831) | (6,515) | (3,145)
Residential Real Estate [Member] | Loans Receivable [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total loans | 751,825 |  | 659,841 |  |  |
Real Estate Construction [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total loans | 318,063 |  | 260,409 |  |  |
Allowance for credit losses | (3,716) | (3,647) | (3,388) | (3,739) | (3,447) | (2,293)
Real Estate Construction [Member] | Loans Receivable [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total loans | 318,063 |  | 260,409 |  |  |
Farm Real Estate [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total loans | 24,122 |  | 24,771 |  |  |
Allowance for credit losses | (221) | (261) | (260) | (227) | (243) | $ (291)
Farm Real Estate [Member] | Loans Receivable [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total loans | 24,122 |  | 24,771 |  |  |
Lease Financing Receivable [Member] | Loans Receivable [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total loans | 49,453 |  | 54,642 |  |  |
Consumer and Other [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total loans | 14,640 |  | 18,057 |  |  |
Allowance for credit losses | (255) | $ (268) | (341) | $ (248) | $ (272) |
Consumer and Other [Member] | Loans Receivable [Member] |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |
Total loans | $ 14,640 |  | $ 18,057 |  |  |

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