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Loans - Analysis of 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 CREDIT LOSSES:      
Charge Offs $ (192) $ (122) $ (990)
Recoveries 137 62 439
Provision for credit losses-loans (289) 817 $ 1,698
Provision for credit losses-off balance sheet credit exposures (266) $ 62  
Cumulative Effect, Period of Adoption, Adjustment [Member]      
ALLOWANCE FOR CREDIT LOSSES:      
Accounting Standards Update [Extensible Enumeration]   Accounting Standards Update 2016-13 [Member] Accounting Standards Update 2016-13 [Member]
Consumer Real Estate [Member]      
ALLOWANCE FOR CREDIT LOSSES:      
Charge Offs (10)    
Recoveries 4 $ 7 $ 35
Provision for credit losses-loans (290) (256) (326)
Agricultural Real Estate [Member]      
ALLOWANCE FOR CREDIT LOSSES:      
Recoveries     105
Provision for credit losses-loans 859 26 24
Agricultural [Member]      
ALLOWANCE FOR CREDIT LOSSES:      
Recoveries     10
Provision for credit losses-loans 41 (35) 225
Commercial Real Estate [Member]      
ALLOWANCE FOR CREDIT LOSSES:      
Recoveries 3 2 8
Provision for credit losses-loans (1,450) 661 1,967
Commercial and Industrial [Member]      
ALLOWANCE FOR CREDIT LOSSES:      
Charge Offs (101)   (565)
Recoveries 66 6 84
Provision for credit losses-loans 674 191 (643)
Consumer [Member]      
ALLOWANCE FOR CREDIT LOSSES:      
Charge Offs (81) (122) (425)
Recoveries 64 47 197
Provision for credit losses-loans (123) 230 451
Unfunded Loan Commitment & Letters of Credit [Member]      
ALLOWANCE FOR CREDIT LOSSES:      
Balance at beginning of year 2,212 1,262 1,262
Provision for credit losses-off balance sheet credit exposures (266) 62 46
Balance at ending of year $ 1,946 2,228 2,212
Unfunded Loan Commitment & Letters of Credit [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]      
ALLOWANCE FOR CREDIT LOSSES:      
Balance at beginning of year   $ 904 $ 904