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Loans - Loan Balances (Detail) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans | $ 16,050 | $ 13,158 |  |
Allowance for credit losses | (38,849) | (37,160) | $ (34,196) | $ (28,511)
Loans Receivable [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans | 2,898,139 | 2,861,727 |  |
Allowance for credit losses | (38,849) | (37,160) |  |
Net loans | 2,859,290 | 2,824,567 |  |
Commercial and Agriculture [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans | 2,370 | 3,698 |  |
Allowance for credit losses | (7,737) | (7,587) | (3,316) | (3,011)
Commercial and Agriculture [Member] | Loans Receivable [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans | 302,663 | 304,793 |  |
Commercial Real Estate Owner Occupied [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans | 379 | 127 |  |
Allowance for credit losses | (4,652) | (4,723) | (5,733) | (4,565)
Commercial Real Estate Owner Occupied [Member] | Loans Receivable [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans | 367,419 | 377,321 |  |
Commercial Real Estate Non Owner Occupied [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans | 2,897 | 0 |  |
Allowance for credit losses | (12,968) | (12,056) | (11,760) | (14,138)
Commercial Real Estate Non Owner Occupied [Member] | Loans Receivable [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans | 1,185,688 | 1,161,894 |  |
Residential Real Estate [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans | 5,917 | 7,403 |  |
Allowance for credit losses | (9,074) | (8,489) | (5,934) | (3,145)
Residential Real Estate [Member] | Loans Receivable [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans | 676,802 | 659,841 |  |
Real Estate Construction [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Allowance for credit losses | (3,433) | (3,388) | (3,920) | (2,293)
Real Estate Construction [Member] | Loans Receivable [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans | 267,737 | 260,409 |  |
Farm Real Estate [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Allowance for credit losses | (320) | (260) | (269) | (291)
Farm Real Estate [Member] | Loans Receivable [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans | 24,908 | 24,771 |  |
Lease Financing Receivable [Member] | Loans Receivable [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans | 56,680 | 54,642 |  |
Consumer and Other [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans | 137 | 197 |  |
Allowance for credit losses | (306) | (341) | $ (354) | $ (98)
Consumer and Other [Member] | Loans Receivable [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Total loans | $ 16,242 | $ 18,056 |  |

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