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Loans - Summary of Activities in Allowance for Credit Losses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Allowance for Loan Losses          
Balance at beginning of year $ 24,634   $ 20,313    
Provision for credit losses-Loans 143 $ 1,628 960 $ 2,208 $ 4,600
Charge Offs (60) (117) (182) (211) (827)
Recoveries 193 142 255 185 298
Balance at ending of year 24,910   24,910   20,313
Consumer Real Estate [Member]          
Allowance for Loan Losses          
Balance at beginning of year 3,623   998    
Provision for credit losses-Loans 369 43 113 73 121
Recoveries 6 4 13 9 20
Balance at ending of year 3,998   3,998   998
Agricultural Real Estate [Member]          
Allowance for Loan Losses          
Balance at beginning of year 209   349    
Provision for credit losses-Loans (76) (260) (50) (694) (691)
Recoveries 104   104    
Balance at ending of year 237   237   349
Agricultural [Member]          
Allowance for Loan Losses          
Balance at beginning of year 66   751    
Provision for credit losses-Loans 41 (90) 6 45 35
Recoveries         7
Balance at ending of year 107   107   751
Commercial Real Estate [Member]          
Allowance for Loan Losses          
Balance at beginning of year 16,088   11,924    
Provision for credit losses-Loans 590 851 1,251 1,292 2,785
Recoveries 3 3 5 5 9
Balance at ending of year 16,681   16,681   11,924
Commercial and Industrial [Member]          
Allowance for Loan Losses          
Balance at beginning of year 3,414   5,382    
Provision for credit losses-Loans (653) 1,234 (462) 1,450 1,860
Charge Offs       (6) (418)
Recoveries 6 65 12 74 93
Balance at ending of year 2,767   2,767   5,382
Consumer [Member]          
Allowance for Loan Losses          
Balance at beginning of year 1,234   909    
Provision for credit losses-Loans (128) (9) 102 50 506
Charge Offs (60) (117) (182) (205) (409)
Recoveries 74 $ 70 121 $ 97 169
Balance at ending of year $ 1,120   1,120   909
Cumulative Effect, Period of Adoption, Adjustment [Member]          
Allowance for Loan Losses          
Balance at beginning of year     $ 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    
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)    
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)    
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    
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)    
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    
Balance at ending of year         $ 170