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Allowance for Loan Losses - Impaired Loans - Average Recorded Investment and Interest Income Recognized (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans with a related ACL | $ 1,198 |
Nonaccrual loans without a related ACL | 11,269 |
Total Nonaccrual loans | 12,467 | $ 6,507
Average Recorded Investment | 1,522 | 1,632
Interest Income Recognized | 73 | 74
Interest Income Recognized | 46 |
Commercial and Agriculture [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans with a related ACL | 914 |
Nonaccrual loans without a related ACL | 4,891 |
Total Nonaccrual loans | 5,805 | 774
Average Recorded Investment | 86 | 15
Interest Income Recognized | 3 | 0
Interest Income Recognized | 9 |
Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans with a related ACL | 269 |
Nonaccrual loans without a related ACL | 3 |
Total Nonaccrual loans | 272 | 386
Average Recorded Investment | 406 | 396
Interest Income Recognized | 22 | 18
Interest Income Recognized | 7 |
Commercial Real Estate Non Owner Occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans without a related ACL | 1,167 |
Total Nonaccrual loans | 1,167 | 1,109
Average Recorded Investment | 35 | 23
Interest Income Recognized | 1 | 1
Residential Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans without a related ACL | 4,633 |
Total Nonaccrual loans | 4,633 | 3,926
Average Recorded Investment | 614 | 629
Interest Income Recognized | 33 | 31
Interest Income Recognized | 26 |
Real Estate Construction [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans without a related ACL | 41 |
Total Nonaccrual loans | 41 | 221
Farm Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 381 | 569
Interest Income Recognized | 14 | 24
Consumer and Other [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Nonaccrual loans without a related ACL | 42 |
Total Nonaccrual loans | 42 | $ 91
Interest Income Recognized | $ 4 |

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