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Loans - Impaired Loans Classified as Troubled Debt Restructured (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 USD ($) Contract Loan | Dec. 31, 2021 USD ($) Contract Loan
Financing Receivable Modifications [Line Items] |  |
Number of Contracts Modified in the Last 12 Months | Loan | 3 | 3
Consumer Real Estate [Member] |  |
Financing Receivable Modifications [Line Items] |  |
Number of Contracts Modified in the Last 12 Months | Contract | 1 |
Pre-Modification Outstanding Recorded Investment | $ 95 |
Post-Modification Outstanding Recorded Investment | $ 95 |
Agricultural Real Estate [Member] |  |
Financing Receivable Modifications [Line Items] |  |
Number of Contracts Modified in the Last 12 Months | Contract |  | 1
Pre-Modification Outstanding Recorded Investment |  | $ 1,655
Post-Modification Outstanding Recorded Investment |  | $ 1,655
Commercial and Industrial [Member] |  |
Financing Receivable Modifications [Line Items] |  |
Number of Contracts Modified in the Last 12 Months | Contract | 2 | 1
Pre-Modification Outstanding Recorded Investment | $ 1,232 | $ 1,000
Post-Modification Outstanding Recorded Investment | $ 1,232 | $ 1,000
Commercial Real Estate [Member] |  |
Financing Receivable Modifications [Line Items] |  |
Number of Contracts Modified in the Last 12 Months | Contract | 1 | 1
Pre-Modification Outstanding Recorded Investment | $ 74 | $ 382
Post-Modification Outstanding Recorded Investment | $ 74 | $ 382

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