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Loans Held-for-Investment and Allowance for Credit Losses - Schedule of Non-Accrual Loans (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024
--- | --- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | $ 56,394 | $ 61,938 | $ 63,378
Commercial [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Non accrual loans | 3,727 | 3,984 | 3,952
Commercial [Member] | C&I [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Non accrual loans | 3,710 | 3,984 | 3,952
Commercial [Member] | Muncipal [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Non accrual loans | 17 | 0 | 0
Agriculture [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Non accrual loans | 1,859 | 1,209 | 2,088
Real Estate [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Non accrual loans | 49,649 | 55,801 | 56,294
Real Estate [Member] | Construction & Development [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Non accrual loans | 1,833 | 1,141 | 1,617
Real Estate [Member] | Farm [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Non accrual loans | 4,736 | 4,176 | 4,738
Real Estate [Member] | Non-Owner Occupied CRE [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Non accrual loans | 2,496 | 11,062 | 12,787
Real Estate [Member] | Owner Occupied CRE [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Non accrual loans | 28,475 | 30,074 | 29,411
Real Estate [Member] | Residential [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Non accrual loans | 12,109 | 9,348 | 7,741
Consumer [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Non accrual loans | 1,159 | 944 | 1,044
Consumer [Member] | Auto [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Non accrual loans | 955 | 638 | 546
Consumer [Member] | Non-Auto [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Non accrual loans | $ 204 | $ 306 | $ 498

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