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Allowance for Credit Losses - Summary of Balance of Loans Individually Evaluated vs. Collectively Evaluated for Impairment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Loans and Leases Receivable Disclosure [Line Items]      
Allowance for Loan Losses, Ending balance $ 23,767 $ 4,666 $ 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 and Leases Receivable, Gross 2,241,359 927,615  
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 23
Allowance for Loan Losses, Ending balance: individually evaluated for impairment   0  
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment   33  
Loans and Leases Receivable, Gross   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   583 582
Allowance for Loan Losses, Ending balance: individually evaluated for impairment   20  
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment   563  
Loans and Leases Receivable, Gross   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   2,462 799
Allowance for Loan Losses, Ending balance: individually evaluated for impairment   0  
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment   2,462  
Loans and Leases Receivable, Gross   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 1,634
Allowance for Loan Losses, Ending balance: individually evaluated for impairment   0  
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment   1,536  
Loans and Leases Receivable, Gross   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 22
Allowance for Loan Losses, Ending balance: individually evaluated for impairment   0  
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment   40  
Loans and Leases Receivable, Gross 5,244 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
Allowance for Loan Losses, Ending balance: individually evaluated for impairment   0  
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment   12  
Loans and Leases Receivable, Gross $ 16,756 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 $ 77
Allowance for Loan Losses, Ending balance: individually evaluated for impairment   0  
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment   $ 0