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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, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Allowance for Loan Losses |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | $ 20,313 |  |  |  |  | $ 20,313 |  |
Provision for credit losses-Loans | $ 278 | $ 460 | $ 143 | 817 | $ 755 | $ 1,637 | $ 1,628 | $ 580 | 1,698 | $ 4,600 | $ 3,444
Charge Offs |  |  |  |  |  |  |  |  | (990) | (827) |
Recoveries |  |  |  |  |  |  |  |  | 439 | 298 |
Balance at ending of year | 25,024 |  |  |  | 20,313 |  |  |  | 25,024 | 20,313 |
Consumer Real Estate [Member] |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan Losses |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | 998 |  |  |  |  | 998 |  |
Provision for credit losses-Loans |  |  |  |  |  |  |  |  | (326) | 121 |
Charge Offs |  |  |  |  |  |  |  |  |  | 0 |
Recoveries |  |  |  |  |  |  |  |  | 35 | 20 |
Balance at ending of year | 3,581 |  |  |  | 998 |  |  |  | 3,581 | 998 |
Agricultural Real Estate [Member] |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan Losses |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | 349 |  |  |  |  | 349 |  |
Provision for credit losses-Loans |  |  |  |  |  |  |  |  | 24 | (691) |
Charge Offs |  |  |  |  |  |  |  |  |  | 0 |
Recoveries |  |  |  |  |  |  |  |  | 105 |  |
Balance at ending of year | 312 |  |  |  | 349 |  |  |  | 312 | 349 |
Agricultural [Member] |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan Losses |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | 751 |  |  |  |  | 751 |  |
Provision for credit losses-Loans |  |  |  |  |  |  |  |  | 225 | 35 |
Charge Offs |  |  |  |  |  |  |  |  |  | 0 |
Recoveries |  |  |  |  |  |  |  |  | 10 | 7 |
Balance at ending of year | 336 |  |  |  | 751 |  |  |  | 336 | 751 |
Commercial Real Estate [Member] |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan Losses |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | 11,924 |  |  |  |  | 11,924 |  |
Provision for credit losses-Loans |  |  |  |  |  |  |  |  | 1,967 | 2,785 |
Recoveries |  |  |  |  |  |  |  |  | 8 | 9 |
Balance at ending of year | 17,400 |  |  |  | 11,924 |  |  |  | 17,400 | 11,924 |
Commercial and Industrial [Member] |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan Losses |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | 5,382 |  |  |  |  | 5,382 |  |
Provision for credit losses-Loans |  |  |  |  |  |  |  |  | (643) | 1,860 |
Charge Offs |  |  |  |  |  |  |  |  | (565) | (418) |
Recoveries |  |  |  |  |  |  |  |  | 84 | 93 |
Balance at ending of year | 2,093 |  |  |  | 5,382 |  |  |  | 2,093 | 5,382 |
Consumer [Member] |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan Losses |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | 909 |  |  |  |  | 909 |  |
Provision for credit losses-Loans |  |  |  |  |  |  |  |  | 451 | 506 |
Charge Offs |  |  |  |  |  |  |  |  | (425) | (409) |
Recoveries |  |  |  |  |  |  |  |  | 197 | 169 |
Balance at ending of year | $ 1,302 |  |  |  | 909 |  |  |  | 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 |  |  |  |  | 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 |  |  |  |  | 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) |  |  |  |  | (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) |  |  |  |  | (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 |  |  |  |  | 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) |  |  |  |  | (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 |  |  |  |  | $ 170 |

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