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Loans Held for Investment and Allowance for Credit Losses on Loans - Collateral-dependent Gross Loans Held for Investment by Collateral Type and Related Specific Allocation (Detail) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Collateral Dependent Loans | $ 34,497 | $ 11,326 |  |
Specific Allocation | 97,267 | 96,800 | $ 94,760 | $ 92,728
Real Estate Asset [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Collateral Dependent Loans | 28,280 | 4,240 |  |
Business Assets [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Collateral Dependent Loans | 5,810 | 6,683 |  |
Other Assets [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Collateral Dependent Loans | 407 | 403 |  |
Specific Allocation [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Specific Allocation | 6,453 | 4,152 |  |
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Specific Allocation | 7,468 | 7,483 | 6,547 | 6,416
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Collateral Dependent Loans | 632 | 632 |  |
Specific Allocation | 33,180 | 33,080 | 32,120 | 30,190
Real Estate [Member] | Construction and Development Less than 60 Months [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Collateral Dependent Loans | 24,977 | 800 |  |
Specific Allocation | 6,596 | 3,950 | 3,608 | 3,778
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Collateral Dependent Loans | 628 | 638 |  |
Specific Allocation | 3,464 | 3,414 | 3,226 | 3,275
Real Estate [Member] | Residential Real Estate First Lien [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Collateral Dependent Loans | 125 | 189 |  |
Specific Allocation | 4,923 | 4,914 | 4,454 | 4,092
Real Estate [Member] | Residential Real Estate All Other [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Collateral Dependent Loans | 81 | 140 |  |
Specific Allocation | 1,652 | 1,646 | 1,444 | 1,418
Real Estate [Member] | Agriculture [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Collateral Dependent Loans | 2,342 | 2,449 |  |
Real Estate [Member] | Real Estate Asset [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Collateral Dependent Loans | 632 | 632 |  |
Real Estate [Member] | Real Estate Asset [Member] | Construction and Development Less than 60 Months [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Collateral Dependent Loans | 24,977 | 800 |  |
Real Estate [Member] | Real Estate Asset [Member] | Construction Residential Real Estate Less than 60 Months [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Collateral Dependent Loans | 628 | 638 |  |
Real Estate [Member] | Real Estate Asset [Member] | Residential Real Estate First Lien [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Collateral Dependent Loans | 125 | 189 |  |
Real Estate [Member] | Real Estate Asset [Member] | Residential Real Estate All Other [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Collateral Dependent Loans | 81 | 140 |  |
Real Estate [Member] | Real Estate Asset [Member] | Agriculture [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Collateral Dependent Loans | 1,837 | 1,841 |  |
Real Estate [Member] | Business Assets [Member] | Agriculture [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Collateral Dependent Loans | 490 | 593 |  |
Real Estate [Member] | Other Assets [Member] | Agriculture [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Collateral Dependent Loans | 15 | 15 |  |
Real Estate [Member] | Specific Allocation [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Specific Allocation | 250 | 250 |  |
Real Estate [Member] | Specific Allocation [Member] | Construction and Development Less than 60 Months [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Specific Allocation | 2,825 | 225 |  |
Real Estate [Member] | Specific Allocation [Member] | Construction Residential Real Estate Less than 60 Months [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Specific Allocation | 134 | 134 |  |
Real Estate [Member] | Specific Allocation [Member] | Residential Real Estate First Lien [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Specific Allocation | 54 | 62 |  |
Real Estate [Member] | Specific Allocation [Member] | Residential Real Estate All Other [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Specific Allocation | 82 | 140 |  |
Real Estate [Member] | Specific Allocation [Member] | Agriculture [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Specific Allocation | 1,386 | 1,386 |  |
Commercial Non-real Estate [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Collateral Dependent Loans | 5,432 | 6,331 |  |
Specific Allocation | 20,482 | 22,745 | 25,079 | 25,106
Commercial Non-real Estate [Member] | Business Assets [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Collateral Dependent Loans | 5,320 | 6,090 |  |
Commercial Non-real Estate [Member] | Other Assets [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Collateral Dependent Loans | 112 | 241 |  |
Commercial Non-real Estate [Member] | Specific Allocation [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Specific Allocation | 1,582 | 1,867 |  |
Consumer Non-real Estate [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Collateral Dependent Loans | 280 | 147 |  |
Specific Allocation | 4,335 | 4,401 | $ 4,232 | $ 4,132
Consumer Non-real Estate [Member] | Other Assets [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Collateral Dependent Loans | 280 | 147 |  |
Consumer Non-real Estate [Member] | Specific Allocation [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Specific Allocation | $ 140 | $ 88 |  |

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