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Loans - Summary of Activities in Allowance for Credit Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Allowance for Loan Losses |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | $ 25,024 |  |  |  | $ 20,313 | $ 25,024 | $ 20,313 |
Provision for (recovery of) credit losses - loans | $ 346 | $ 282 | $ 605 | (289) | $ 278 | $ 460 | $ 143 | 817 | 944 | 1,698 | $ 4,600
Charge Offs |  |  |  |  |  |  |  |  | (480) | (990) |
Recoveries |  |  |  |  |  |  |  |  | 338 | 439 |
Balance at ending of year | 25,826 |  |  |  | 25,024 |  |  |  | 25,826 | 25,024 | 20,313
Consumer Real Estate [Member] |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan Losses |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | 3,581 |  |  |  | 998 | 3,581 | 998 |
Provision for (recovery of) credit losses - loans |  |  |  |  |  |  |  |  | (31) | (326) |
Charge Offs |  |  |  |  |  |  |  |  | (13) |  |
Recoveries |  |  |  |  |  |  |  |  | 6 | 35 |
Balance at ending of year | 3,543 |  |  |  | 3,581 |  |  |  | 3,543 | 3,581 | 998
Agricultural Real Estate [Member] |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan Losses |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | 312 |  |  |  | 349 | 312 | 349 |
Provision for (recovery of) credit losses - loans |  |  |  |  |  |  |  |  | 583 | 24 |
Recoveries |  |  |  |  |  |  |  |  |  | 105 |
Balance at ending of year | 895 |  |  |  | 312 |  |  |  | 895 | 312 | 349
Agricultural [Member] |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan Losses |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | 336 |  |  |  | 751 | 336 | 751 |
Provision for (recovery of) credit losses - loans |  |  |  |  |  |  |  |  | (52) | 225 |
Recoveries |  |  |  |  |  |  |  |  | 1 | 10 |
Balance at ending of year | 285 |  |  |  | 336 |  |  |  | 285 | 336 | 751
Commercial Real Estate [Member] |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan Losses |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | 17,400 |  |  |  | 11,924 | 17,400 | 11,924 |
Provision for (recovery of) credit losses - loans |  |  |  |  |  |  |  |  | (834) | 1,967 |
Charge Offs |  |  |  |  |  |  |  |  | (15) |  |
Recoveries |  |  |  |  |  |  |  |  | 9 | 8 |
Balance at ending of year | 16,560 |  |  |  | 17,400 |  |  |  | 16,560 | 17,400 | 11,924
Commercial and Industrial [Member] |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan Losses |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | 2,093 |  |  |  | 5,382 | 2,093 | 5,382 |
Provision for (recovery of) credit losses - loans |  |  |  |  |  |  |  |  | 1,411 | (643) |
Charge Offs |  |  |  |  |  |  |  |  | (106) | (565) |
Recoveries |  |  |  |  |  |  |  |  | 133 | 84 |
Balance at ending of year | 3,531 |  |  |  | 2,093 |  |  |  | 3,531 | 2,093 | 5,382
Consumer [Member] |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan Losses |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | $ 1,302 |  |  |  | 909 | 1,302 | 909 |
Provision for (recovery of) credit losses - loans |  |  |  |  |  |  |  |  | (133) | 451 |
Charge Offs |  |  |  |  |  |  |  |  | (346) | (425) |
Recoveries |  |  |  |  |  |  |  |  | 189 | 197 |
Balance at ending of year | $ 1,012 |  |  |  | $ 1,302 |  |  |  | $ 1,012 | 1,302 | 909
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] |
Balance at ending of year |  |  |  |  |  |  |  |  |  |  | 3,564
Cumulative Effect, Period of Adoption, Adjustment [Member] | Consumer Real Estate [Member] |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan Losses |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  |  |  |  |  | 2,874 |  | $ 2,874 |
Balance at ending of year |  |  |  |  |  |  |  |  |  |  | 2,874
Cumulative Effect, Period of Adoption, Adjustment [Member] | Agricultural Real Estate [Member] |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan Losses |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  |  |  |  |  | (166) |  | (166) |
Balance at ending of year |  |  |  |  |  |  |  |  |  |  | (166)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Agricultural [Member] |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan Losses |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  |  |  |  |  | (650) |  | (650) |
Balance at ending of year |  |  |  |  |  |  |  |  |  |  | (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 |
Balance at ending of year |  |  |  |  |  |  |  |  |  |  | 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) |
Balance at ending of year |  |  |  |  |  |  |  |  |  |  | (2,165)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Consumer [Member] |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan Losses |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  |  |  |  |  | $ 170 |  | $ 170 |
Balance at ending of year |  |  |  |  |  |  |  |  |  |  | $ 170

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