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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, 2022 | Dec. 31, 2021
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Financing Receivable Allowance For Credit Losses [Line Items] |  |
Collateral Dependent Loans | $ 17,031 | $ 24,857
Real Estate Asset [Member] |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Collateral Dependent Loans | 7,020 | 13,129
Business Assets [Member] |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Collateral Dependent Loans | 6,088 | 6,472
Other Assets [Member] |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Collateral Dependent Loans | 3,923 | 5,256
Specific Allocation [Member] |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Collateral Dependent Loans | 5,676 | 7,923
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Collateral Dependent Loans | 1,307 | 1,952
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Collateral Dependent Loans | 595 | 1,404
Real Estate [Member] | Residential Real Estate First Lien [Member] |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Collateral Dependent Loans | 372 | 871
Real Estate [Member] | Residential Real Estate All Other [Member] |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Collateral Dependent Loans |  | 199
Real Estate [Member] | Farmland [Member] |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Collateral Dependent Loans | 4,746 | 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 | 1,307 | 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 | 595 | 1,404
Real Estate [Member] | Real Estate Asset [Member] | Residential Real Estate First Lien [Member] |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Collateral Dependent Loans | 372 | 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 |  | 199
Real Estate [Member] | Real Estate Asset [Member] | Farmland [Member] |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Collateral Dependent Loans | 4,746 | 8,703
Real Estate [Member] | Specific Allocation [Member] | Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Collateral Dependent Loans | 488 | 576
Real Estate [Member] | Specific Allocation [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Collateral Dependent Loans | 64 | 263
Real Estate [Member] | Specific Allocation [Member] | Residential Real Estate First Lien [Member] |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Collateral Dependent Loans | 96 | 143
Real Estate [Member] | Specific Allocation [Member] | Residential Real Estate All Other [Member] |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Collateral Dependent Loans |  | 178
Real Estate [Member] | Specific Allocation [Member] | Farmland [Member] |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Collateral Dependent Loans | 971 | 1,805
Commercial and Agricultural Non-Real Estate [Member] |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Collateral Dependent Loans | 9,904 | 11,674
Commercial and Agricultural Non-Real Estate [Member] | Business Assets [Member] |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Collateral Dependent Loans | 6,088 | 6,472
Commercial and Agricultural Non-Real Estate [Member] | Other Assets [Member] |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Collateral Dependent Loans | 3,816 | 5,202
Commercial and Agricultural Non-Real Estate [Member] | Specific Allocation [Member] |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Collateral Dependent Loans | 3,998 | 4,938
Consumer Non-real Estate [Member] |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Collateral Dependent Loans | 107 | 54
Consumer Non-real Estate [Member] | Other Assets [Member] |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Collateral Dependent Loans | 107 | 54
Consumer Non-real Estate [Member] | Specific Allocation [Member] |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Collateral Dependent Loans | $ 59 | $ 20

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