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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 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | $ 13,134 |  | $ 18,171 |  |  |
Specific Allocation | 97,776 | $ 96,920 | 92,728 | $ 89,871 | $ 86,935 | $ 83,936
Real Estate Asset [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 4,460 |  | 7,833 |  |  |
Business Assets [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 5,519 |  | 6,625 |  |  |
Other Assets [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 3,155 |  | 3,713 |  |  |
Specific Allocation [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Specific Allocation | 4,300 |  | 6,597 |  |  |
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans |  |  | 2,213 |  |  |
Specific Allocation | 6,815 | 6,808 | 6,416 | 7,123 | 6,928 | 7,550
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 632 |  | 1,263 |  |  |
Specific Allocation | 34,614 | 33,432 | 30,190 | 23,686 | 16,315 | 16,807
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 366 |  | 420 |  |  |
Specific Allocation | 3,544 | 3,553 | 3,275 | 2,307 | 1,183 | 1,051
Real Estate [Member] | Residential Real Estate First Lien [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 214 |  | 481 |  |  |
Specific Allocation | 4,764 | 4,755 | 4,092 | 3,341 | 3,355 | 3,048
Real Estate [Member] | Residential Real Estate All Other [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 57 |  | 9 |  |  |
Specific Allocation | 1,665 | 1,661 | 1,418 | 1,563 | 1,480 | 1,567
Real Estate [Member] | Agriculture [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 6,833 |  | 7,740 |  |  |
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 |  |  |
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 |  | 1,263 |  |  |
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 | 366 |  | 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 | 214 |  | 481 |  |  |
Real Estate [Member] | Real Estate Asset [Member] | Residential Real Estate All Other [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 57 |  | 9 |  |  |
Real Estate [Member] | Real Estate Asset [Member] | Agriculture [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 3,191 |  | 3,447 |  |  |
Real Estate [Member] | Business Assets [Member] | Agriculture [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 603 |  | 701 |  |  |
Real Estate [Member] | Other Assets [Member] | Agriculture [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 3,039 |  | 3,592 |  |  |
Real Estate [Member] | Specific Allocation [Member] | Commercial Real Estate Owner Occupied [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Specific Allocation |  |  | 870 |  |  |
Real Estate [Member] | Specific Allocation [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Specific Allocation | 250 |  | 333 |  |  |
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 |  | 45 |  |  |
Real Estate [Member] | Specific Allocation [Member] | Residential Real Estate First Lien [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Specific Allocation | 65 |  | 207 |  |  |
Real Estate [Member] | Specific Allocation [Member] | Residential Real Estate All Other [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Specific Allocation | 60 |  | 9 |  |  |
Real Estate [Member] | Specific Allocation [Member] | Agriculture [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Specific Allocation | 2,586 |  | 3,114 |  |  |
Commercial and Agricultural Non-Real Estate [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans |  |  | 5,928 |  |  |
Commercial and Agricultural Non-Real Estate [Member] | Business Assets [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans |  |  | 5,924 |  |  |
Commercial and Agricultural Non-Real Estate [Member] | Other Assets [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans |  |  | 4 |  |  |
Commercial and Agricultural Non-Real Estate [Member] | Specific Allocation [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Specific Allocation |  |  | 1,938 |  |  |
Commercial Non-real Estate [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 4,939 |  |  |  |  |
Specific Allocation | 24,245 | 25,127 | 25,106 | 24,954 | 25,370 | 25,565
Commercial Non-real Estate [Member] | Business Assets [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 4,902 |  |  |  |  |
Commercial Non-real Estate [Member] | Other Assets [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 37 |  |  |  |  |
Commercial Non-real Estate [Member] | Specific Allocation [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Specific Allocation | 1,229 |  |  |  |  |
Consumer Non-real Estate [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 93 |  | 117 |  |  |
Specific Allocation | 4,389 | $ 4,344 | 4,132 | $ 4,205 | $ 4,050 | $ 3,694
Consumer Non-real Estate [Member] | Business Assets [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 14 |  |  |  |  |
Consumer Non-real Estate [Member] | Other Assets [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Collateral Dependent Loans | 79 |  | 117 |  |  |
Consumer Non-real Estate [Member] | Specific Allocation [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Specific Allocation | $ 65 |  | $ 81 |  |  |

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