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Allowances for Loan Losses - Summary of Impaired Loans (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Financing Receivable, Impaired [Line Items]      
With an allowance recorded, Related Allowance $ 4   $ 0
Total, Recorded Investment 2,351   751
Total, Unpaid Principal Balance 2,491   840
Total, Related Allowance 4   0
With no related allowance recorded, Average Recorded Investment 2,369 $ 249  
With no related allowance recorded, Interest Recognized 23 4  
Total, Average Recorded Investment 2,373 249  
Total, Interest Recognized 23 4  
Agriculture Loans [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 250   0
With no related allowance recorded, Unpaid Principal Balance 250   0
With an allowance recorded, Recorded Investment 0   0
With an allowance recorded, Unpaid Principal Balance 0   0
With an allowance recorded, Related Allowance 0   0
Total, Recorded Investment 250   0
Total, Unpaid Principal Balance 250   0
Total, Related Allowance 0   0
With no related allowance recorded, Average Recorded Investment 249 0  
With no related allowance recorded, Interest Recognized 3 0  
With an allowance recorded, Average Recorded Investment 0 0  
With an allowance recorded, Interest Recognized 0 0  
Commercial Loans [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 37   42
With no related allowance recorded, Unpaid Principal Balance 56   61
With an allowance recorded, Recorded Investment 0   0
With an allowance recorded, Unpaid Principal Balance 0   0
With an allowance recorded, Related Allowance 0   0
Total, Recorded Investment 37   42
Total, Unpaid Principal Balance 56   61
Total, Related Allowance 0   0
With no related allowance recorded, Average Recorded Investment 37 1  
With no related allowance recorded, Interest Recognized 0 0  
With an allowance recorded, Average Recorded Investment 0 0  
With an allowance recorded, Interest Recognized 0 0  
Commercial Real Estate Loans [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 177  
With no related allowance recorded, Unpaid Principal Balance 177  
With an allowance recorded, Recorded Investment 0   0
With an allowance recorded, Unpaid Principal Balance 0   0
With an allowance recorded, Related Allowance 0   0
Total, Recorded Investment 177   0
Total, Unpaid Principal Balance 177   0
Total, Related Allowance 0   0
With no related allowance recorded, Average Recorded Investment 181 0  
With no related allowance recorded, Interest Recognized 3 0  
With an allowance recorded, Average Recorded Investment 0 0  
With an allowance recorded, Interest Recognized 0 0  
Residential Real Estate Loans [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 1,883   709
With no related allowance recorded, Unpaid Principal Balance 2,004   779
With an allowance recorded, Recorded Investment 4   0
With an allowance recorded, Unpaid Principal Balance 4   0
With an allowance recorded, Related Allowance 4   0
Total, Recorded Investment 1,887   709
Total, Unpaid Principal Balance 2,008   779
Total, Related Allowance 4   0
With no related allowance recorded, Average Recorded Investment 1,902 248  
With no related allowance recorded, Interest Recognized 17 4  
With an allowance recorded, Average Recorded Investment 4 0  
With an allowance recorded, Interest Recognized 0 0  
Consumer Loans [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 0  
With no related allowance recorded, Unpaid Principal Balance 0  
With an allowance recorded, Recorded Investment 0   0
With an allowance recorded, Unpaid Principal Balance 0   0
With an allowance recorded, Related Allowance 0   0
Total, Recorded Investment 0   0
Total, Unpaid Principal Balance 0   0
Total, Related Allowance 0   0
With no related allowance recorded, Average Recorded Investment 0 0  
With no related allowance recorded, Interest Recognized 0 0  
With an allowance recorded, Average Recorded Investment 0 0  
With an allowance recorded, Interest Recognized 0 0  
Municipal Loans [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 0  
With no related allowance recorded, Unpaid Principal Balance 0  
With an allowance recorded, Recorded Investment 0   0
With an allowance recorded, Unpaid Principal Balance 0   0
With an allowance recorded, Related Allowance 0   0
Total, Recorded Investment 0   0
Total, Unpaid Principal Balance 0   0
Total, Related Allowance 0   $ 0
With no related allowance recorded, Average Recorded Investment 0 0  
With no related allowance recorded, Interest Recognized 0 0  
With an allowance recorded, Average Recorded Investment 0 0  
With an allowance recorded, Interest Recognized $ 0 $ 0