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Allowances for Loan Losses - Summary of Balance of Loans Individually Evaluated vs. Collectively Evaluated for Impairment (Detail) - USD ($)
$ in Thousands
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Loans and Leases Receivable Disclosure [Line Items]            
Allowance for Loan Losses, Ending balance $ 4,569 $ 3,890 $ 3,152 $ 3,335 $ 2,875 $ 2,789
Allowance for Loan Losses, Ending balance: individually evaluated for impairment 18   0      
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment 4,551   3,152      
Loans, Ending balance 863,984   715,039      
Loans, Ending balance: individually evaluated for impairment 5,687   751      
Ending balance: loans acquired with deteriorated credit quality 4,811   5,556      
Loans, Ending balance: collectively evaluated for impairment 853,486   708,732      
Agriculture Loans [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Allowance for Loan Losses, Ending balance 38 17 23 129 98 120
Allowance for Loan Losses, Ending balance: individually evaluated for impairment 0   0      
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment 13,877   23      
Loans, Ending balance 13,977   9,341      
Loans, Ending balance: individually evaluated for impairment 100   0      
Ending balance: loans acquired with deteriorated credit quality 0   0      
Loans, Ending balance: collectively evaluated for impairment 38   9,341      
Commercial and PPP Loans [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Allowance for Loan Losses, Ending balance 627 506 582 458 350 290
Allowance for Loan Losses, Ending balance: individually evaluated for impairment 0   0      
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment 98,440   582      
Loans, Ending balance 98,475   122,378      
Loans, Ending balance: individually evaluated for impairment 35   42      
Ending balance: loans acquired with deteriorated credit quality 0   512      
Loans, Ending balance: collectively evaluated for impairment 627   121,824      
Commercial Real Estate Loans [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Allowance for Loan Losses, Ending balance 2,213 1,786 799 363 342 314
Allowance for Loan Losses, Ending balance: individually evaluated for impairment 0   0      
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment 475,739   799      
Loans, Ending balance 482,367   338,749      
Loans, Ending balance: individually evaluated for impairment 2,410          
Ending balance: loans acquired with deteriorated credit quality 4,218   4,394      
Loans, Ending balance: collectively evaluated for impairment 2,213   334,355      
Residential Real Estate Loans [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Allowance for Loan Losses, Ending balance 1,643 1,547 1,634 2,370 1,670 1,702
Allowance for Loan Losses, Ending balance: individually evaluated for impairment 16   0      
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment 248,099   1,634      
Loans, Ending balance 251,832   231,302      
Loans, Ending balance: individually evaluated for impairment 3,140   709      
Ending balance: loans acquired with deteriorated credit quality 593   650      
Loans, Ending balance: collectively evaluated for impairment 1,627   229,943      
Consumer Loans [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Allowance for Loan Losses, Ending balance 33 21 22 20 23 35
Allowance for Loan Losses, Ending balance: individually evaluated for impairment 2   0      
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment 11,927   22      
Loans, Ending balance 11,929   7,087      
Loans, Ending balance: individually evaluated for impairment 2   0      
Ending balance: loans acquired with deteriorated credit quality 0   0      
Loans, Ending balance: collectively evaluated for impairment 31   7,087      
Municipal Loans [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Allowance for Loan Losses, Ending balance 15 13 15 29 16 18
Allowance for Loan Losses, Ending balance: individually evaluated for impairment 0   0      
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment 5,404   15      
Loans, Ending balance 5,404   6,182      
Loans, Ending balance: individually evaluated for impairment 0   0      
Ending balance: loans acquired with deteriorated credit quality     0      
Loans, Ending balance: collectively evaluated for impairment 15   6,182      
Unallocated [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Allowance for Loan Losses, Ending balance 0 $ 0 77 $ 34 $ 376 $ 310
Allowance for Loan Losses, Ending balance: individually evaluated for impairment 0   0      
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment $ 0   $ 77