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Allowance for Credit Losses - Schedule of allowance for credit losses on off-balance sheet credit exposures (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
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Financing Receivable Recorded Investment [Line Items] |  |  |
Total allowance for credit losses | $ 35,280 | $ 35,149 | $ 28,511
Off-Balance Sheet Credit Exposures [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total allowance for credit losses | 3,981 | 3,851 |
Commercial and Agriculture [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total allowance for credit losses | 5,156 | 5,540 | 3,011
Commercial Real Estate Owner Occupied [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total allowance for credit losses | 5,481 | 5,531 | 4,565
Commercial Real Estate Non Owner Occupied [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total allowance for credit losses | 11,555 | 11,646 | 14,138
Real Estate Construction [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total allowance for credit losses | 3,739 | 3,447 | 2,293
Farm Real Estate [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total allowance for credit losses | 227 | 243 | 291
Lease Financing Receivables [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total allowance for credit losses | 1,832 | 1,947 | 429
Consumer and Other [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total allowance for credit losses | $ 248 | $ 272 | $ 98

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