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Allowance for Credit Losses - Summary of Balance of Loans Individually Evaluated vs. Collectively Evaluated for Impairment (Detail) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Loans and Leases Receivable Disclosure [Line Items]          
Allowance for Loan Losses, Ending balance $ 10,228 $ 4,666 $ 3,890 $ 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 969,170 927,615      
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 17 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   583 506 585 582
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 1,786 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 1,547 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 21 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 3,929 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 13 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 $ 11,308 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 $ 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