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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