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Loans - Summary of Activities in Allowance for Credit Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Allowance for Loan Losses |  |  |
Balance at beginning of year | $ 25,024 | $ 20,313 | $ 20,313
Provision for credit losses - loans | (289) | 817 | 1,698
Charge Offs | (192) | (122) | (990)
Recoveries | 137 | 62 | 439
Balance at ending of year | 24,680 | 24,634 | 25,024
Consumer Real Estate [Member] |  |  |
Allowance for Loan Losses |  |  |
Balance at beginning of year | 3,581 | 998 | 998
Provision for credit losses - loans | (290) | (256) | (326)
Charge Offs | (10) |  |
Recoveries | 4 | 7 | 35
Balance at ending of year | 3,285 | 3,623 | 3,581
Agricultural Real Estate [Member] |  |  |
Allowance for Loan Losses |  |  |
Balance at beginning of year | 312 | 349 | 349
Provision for credit losses - loans | 859 | 26 | 24
Recoveries |  |  | 105
Balance at ending of year | 1,171 | 209 | 312
Agricultural [Member] |  |  |
Allowance for Loan Losses |  |  |
Balance at beginning of year | 336 | 751 | 751
Provision for credit losses - loans | 41 | (35) | 225
Recoveries |  |  | 10
Balance at ending of year | 377 | 66 | 336
Commercial Real Estate [Member] |  |  |
Allowance for Loan Losses |  |  |
Balance at beginning of year | 17,400 | 11,924 | 11,924
Provision for credit losses - loans | (1,450) | 661 | 1,967
Recoveries | 3 | 2 | 8
Balance at ending of year | 15,953 | 16,088 | 17,400
Commercial and Industrial [Member] |  |  |
Allowance for Loan Losses |  |  |
Balance at beginning of year | 2,093 | 5,382 | 5,382
Provision for credit losses - loans | 674 | 191 | (643)
Charge Offs | (101) |  | (565)
Recoveries | 66 | 6 | 84
Balance at ending of year | 2,732 | 3,414 | 2,093
Consumer [Member] |  |  |
Allowance for Loan Losses |  |  |
Balance at beginning of year | 1,302 | 909 | 909
Provision for credit losses - loans | (123) | 230 | 451
Charge Offs | (81) | (122) | (425)
Recoveries | 64 | 47 | 197
Balance at ending of year | $ 1,162 | 1,234 | 1,302
Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |
Allowance for Loan Losses |  |  |
Balance at beginning of year |  | $ 3,564 | $ 3,564
Accounting Standards Update [Extensible Enumeration] |  | Accounting Standards Update 2016-13 [Member] | Accounting Standards Update 2016-13 [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member] | Consumer Real Estate [Member] |  |  |
Allowance for Loan Losses |  |  |
Balance at beginning of year |  | $ 2,874 | $ 2,874
Cumulative Effect, Period of Adoption, Adjustment [Member] | Agricultural Real Estate [Member] |  |  |
Allowance for Loan Losses |  |  |
Balance at beginning of year |  | (166) | (166)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Agricultural [Member] |  |  |
Allowance for Loan Losses |  |  |
Balance at beginning of year |  | (650) | (650)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Commercial Real Estate [Member] |  |  |
Allowance for Loan Losses |  |  |
Balance at beginning of year |  | 3,501 | 3,501
Cumulative Effect, Period of Adoption, Adjustment [Member] | Commercial and Industrial [Member] |  |  |
Allowance for Loan Losses |  |  |
Balance at beginning of year |  | (2,165) | (2,165)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Consumer [Member] |  |  |
Allowance for Loan Losses |  |  |
Balance at beginning of year |  | $ 170 | $ 170

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