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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