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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 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Collateral Dependent Loans | $ 18,171 | $ 24,857 |
Specific Allocation | 92,728 | 83,936 | $ 91,366
Real Estate Asset [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Collateral Dependent Loans | 7,833 | 13,129 |
Business Assets [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Collateral Dependent Loans | 6,625 | 6,472 |
Other Assets [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Collateral Dependent Loans | 3,713 | 5,256 |
Specific Allocation [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Specific Allocation | 6,597 | 7,923 |
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Collateral Dependent Loans | 2,213 | 1,952 |
Specific Allocation | 6,412 | 7,568 | 8,470
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Collateral Dependent Loans | 1,263 | 1,404 |
Specific Allocation | 30,192 | 16,987 | 12,318
Real Estate [Member] | Construction and Development Less than 60 Months [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Specific Allocation | 3,778 | 3,490 | 2,723
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Collateral Dependent Loans | 420 |  |
Specific Allocation | 3,276 | 1,092 | 726
Real Estate [Member] | Residential Real Estate First Lien [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Collateral Dependent Loans | 481 | 871 |
Specific Allocation | 4,098 | 3,076 | 2,822
Real Estate [Member] | Residential Real Estate All Other [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Collateral Dependent Loans | 9 | 199 |
Specific Allocation | 1,845 | 2,104 | 2,236
Real Estate [Member] | Farmland [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Collateral Dependent Loans | 3,447 | 8,703 |
Real Estate [Member] | Real Estate Asset [Member] | Commercial Real Estate Owner Occupied [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Collateral Dependent Loans | 2,213 | 1,952 |
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 | 1,263 | 1,404 |
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 | 420 |  |
Real Estate [Member] | Real Estate Asset [Member] | Residential Real Estate First Lien [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Collateral Dependent Loans | 481 | 871 |
Real Estate [Member] | Real Estate Asset [Member] | Residential Real Estate All Other [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Collateral Dependent Loans | 9 | 199 |
Real Estate [Member] | Real Estate Asset [Member] | Farmland [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Collateral Dependent Loans | 3,447 | 8,703 |
Real Estate [Member] | Specific Allocation [Member] | Commercial Real Estate Owner Occupied [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Specific Allocation | 870 | 576 |
Real Estate [Member] | Specific Allocation [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Specific Allocation | 333 | 263 |
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 | 45 |  |
Real Estate [Member] | Specific Allocation [Member] | Residential Real Estate First Lien [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Specific Allocation | 207 | 143 |
Real Estate [Member] | Specific Allocation [Member] | Residential Real Estate All Other [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Specific Allocation | 9 | 178 |
Real Estate [Member] | Specific Allocation [Member] | Farmland [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Specific Allocation | 831 | 1,805 |
Commercial and Agricultural Non-Real Estate [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Collateral Dependent Loans | 10,221 | 11,674 |
Specific Allocation | 27,311 | 28,085 | 34,643
Commercial and Agricultural Non-Real Estate [Member] | Business Assets [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Collateral Dependent Loans | 6,625 | 6,472 |
Commercial and Agricultural Non-Real Estate [Member] | Other Assets [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Collateral Dependent Loans | 3,596 | 5,202 |
Commercial and Agricultural Non-Real Estate [Member] | Specific Allocation [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Specific Allocation | 4,221 | 4,938 |
Consumer Non-real Estate [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Collateral Dependent Loans | 117 | 54 |
Specific Allocation | 4,135 | 3,734 | $ 3,542
Consumer Non-real Estate [Member] | Other Assets [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Collateral Dependent Loans | 117 | 54 |
Consumer Non-real Estate [Member] | Specific Allocation [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Specific Allocation | $ 81 | $ 20 |

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