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Allowance for Credit Losses - Summary of Balance of Loans Individually Evaluated vs. Collectively Evaluated for Impairment (Detail) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Loans and Leases Receivable Disclosure [Line Items]        
Allowance for Loan Losses, Ending balance $ 10,526 $ 4,666 $ 3,443 $ 3,152
Allowance for Loan Losses, Ending balance: individually evaluated for impairment   20    
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment   4,646    
Loans, Ending balance 945,059 927,615    
Loans, Ending balance: individually evaluated for impairment   7,313    
Ending balance: loans acquired with deteriorated credit quality   2,409    
Loans, Ending balance: collectively evaluated for impairment   917,893    
Agriculture Loans [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Allowance for Loan Losses, Ending balance   33 20 23
Allowance for Loan Losses, Ending balance: individually evaluated for impairment   0    
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment   33    
Loans, Ending balance   15,591    
Loans, Ending balance: individually evaluated for impairment   300    
Ending balance: loans acquired with deteriorated credit quality   0    
Loans, Ending balance: collectively evaluated for impairment   15,291    
Commercial and PPP Loans [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Allowance for Loan Losses, Ending balance   583 585 582
Allowance for Loan Losses, Ending balance: individually evaluated for impairment   20    
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment   563    
Loans, Ending balance   104,755    
Loans, Ending balance: individually evaluated for impairment   55    
Ending balance: loans acquired with deteriorated credit quality   0    
Loans, Ending balance: collectively evaluated for impairment   104,700    
Commercial Real Estate Loans [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Allowance for Loan Losses, Ending balance   2,462 1,070 799
Allowance for Loan Losses, Ending balance: individually evaluated for impairment   0    
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment   2,462    
Loans, Ending balance   540,914    
Loans, Ending balance: individually evaluated for impairment   2,306    
Ending balance: loans acquired with deteriorated credit quality   2,227    
Loans, Ending balance: collectively evaluated for impairment   536,381    
Residential Real Estate Loans [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Allowance for Loan Losses, Ending balance   1,536 1,728 1,634
Allowance for Loan Losses, Ending balance: individually evaluated for impairment   0    
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment   1,536    
Loans, Ending balance   250,832    
Loans, Ending balance: individually evaluated for impairment   4,652    
Ending balance: loans acquired with deteriorated credit quality   182    
Loans, Ending balance: collectively evaluated for impairment   245,998    
Consumer Loans [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Allowance for Loan Losses, Ending balance   40 13 22
Allowance for Loan Losses, Ending balance: individually evaluated for impairment   0    
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment   40    
Loans, Ending balance 4,292 10,057    
Loans, Ending balance: individually evaluated for impairment   0    
Ending balance: loans acquired with deteriorated credit quality   0    
Loans, Ending balance: collectively evaluated for impairment   10,057    
Municipal Loans [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Allowance for Loan Losses, Ending balance   12 15 15
Allowance for Loan Losses, Ending balance: individually evaluated for impairment   0    
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment   12    
Loans, Ending balance $ 10,472 5,466    
Loans, Ending balance: individually evaluated for impairment   0    
Ending balance: loans acquired with deteriorated credit quality   0    
Loans, Ending balance: collectively evaluated for impairment   5,466    
Unallocated [Member]        
Loans and Leases Receivable Disclosure [Line Items]        
Allowance for Loan Losses, Ending balance   0 $ 12 $ 77
Allowance for Loan Losses, Ending balance: individually evaluated for impairment   0    
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment   $ 0