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Allowances for Loan Losses - Summary of Balance of Loans Individually Evaluated vs. Collectively Evaluated for Impairment (Detail) - USD ($)
$ in Thousands
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Loans and Leases Receivable Disclosure [Line Items]            
Allowance for Loan Losses, Ending balance $ 3,890 $ 3,443 $ 3,152 $ 2,875 $ 2,787 $ 2,789
Allowance for Loan Losses, Ending balance: individually evaluated for impairment 0   0      
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment 3,890   3,152      
Loans, Ending balance 790,181   715,039      
Loans, Ending balance: individually evaluated for impairment 8,297   751      
Ending balance: loans acquired with deteriorated credit quality 5,567   5,556      
Loans, Ending balance: collectively evaluated for impairment 776,317   708,732      
Agriculture Loans [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Allowance for Loan Losses, Ending balance 17 20 23 98 105 120
Allowance for Loan Losses, Ending balance: individually evaluated for impairment 0   0      
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment 17   23      
Loans, Ending balance 7,710   9,341      
Loans, Ending balance: individually evaluated for impairment 200   0      
Ending balance: loans acquired with deteriorated credit quality 0   0      
Loans, Ending balance: collectively evaluated for impairment 7,510   9,341      
Commercial and PPP Loans [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Allowance for Loan Losses, Ending balance 506   582 352   290
Allowance for Loan Losses, Ending balance: individually evaluated for impairment 0   0      
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment 506   582      
Loans, Ending balance 90,979   122,378      
Loans, Ending balance: individually evaluated for impairment 2,451   42      
Ending balance: loans acquired with deteriorated credit quality 601   512      
Loans, Ending balance: collectively evaluated for impairment 87,927   121,824      
Commercial Real Estate Loans [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Allowance for Loan Losses, Ending balance 1,786 1,070 799 340 315 314
Allowance for Loan Losses, Ending balance: individually evaluated for impairment 0   0      
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment 1,786   799      
Loans, Ending balance 435,588   338,749      
Loans, Ending balance: individually evaluated for impairment 2,501   0      
Ending balance: loans acquired with deteriorated credit quality 4,369   4,394      
Loans, Ending balance: collectively evaluated for impairment 428,718   334,355      
Residential Real Estate Loans [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Allowance for Loan Losses, Ending balance 1,547 1,728 1,634 1,670 1,674 1,702
Allowance for Loan Losses, Ending balance: individually evaluated for impairment 0   0      
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment 1,547   1,634      
Loans, Ending balance 241,401   231,302      
Loans, Ending balance: individually evaluated for impairment 3,145   709      
Ending balance: loans acquired with deteriorated credit quality 597   650      
Loans, Ending balance: collectively evaluated for impairment 237,659   229,943      
Consumer Loans [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Allowance for Loan Losses, Ending balance 21 13 22 23 24 35
Allowance for Loan Losses, Ending balance: individually evaluated for impairment 0   0      
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment 21   22      
Loans, Ending balance 8,689   7,087      
Loans, Ending balance: individually evaluated for impairment 0   0      
Ending balance: loans acquired with deteriorated credit quality 0   0      
Loans, Ending balance: collectively evaluated for impairment 8,689   7,087      
Municipal Loans [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Allowance for Loan Losses, Ending balance 13 15 15 16 18 18
Allowance for Loan Losses, Ending balance: individually evaluated for impairment 0   0      
Allowance for Loan Losses, Ending balance: collectively evaluated for impairment 13   15      
Loans, Ending balance 5,814   6,182      
Loans, Ending balance: individually evaluated for impairment 0   0      
Ending balance: loans acquired with deteriorated credit quality 0   0      
Loans, Ending balance: collectively evaluated for impairment 5,814   6,182      
Unallocated [Member]            
Loans and Leases Receivable Disclosure [Line Items]            
Allowance for Loan Losses, Ending balance 0 $ 12 77 $ 376 $ 336 $ 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