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Allowance for Credit Losses - Summary of Impaired Loans (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Dec. 31, 2022
Financing Receivable, Impaired [Line Items]    
With an allowance recorded, Recorded Investment   $ 0
With an allowance recorded, Unpaid Principal Balance   0
With an allowance recorded, Related Allowance   20
Total, Recorded Investment   7,313
Total, Unpaid Principal Balance   7,370
Total, Related Allowance   20
With no related allowance recorded, Average Recorded Investment $ 2,369  
With no related allowance recorded, Interest Recognized 23  
With an allowance recorded, Average Recorded Investment 4  
With an allowance recorded, Interest Recognized 0  
Total, Average Recorded Investment 2,373  
Total, Interest Recognized 23  
Agriculture Loans [Member]    
Financing Receivable, Impaired [Line Items]    
With no related allowance recorded, Recorded Investment   300
With no related allowance recorded, Unpaid Principal Balance   300
With an allowance recorded, Recorded Investment   0
With an allowance recorded, Unpaid Principal Balance   0
With an allowance recorded, Related Allowance   0
Total, Recorded Investment   300
Total, Unpaid Principal Balance   300
Total, Related Allowance   0
With no related allowance recorded, Average Recorded Investment 249  
With no related allowance recorded, Interest Recognized 3  
With an allowance recorded, Average Recorded Investment 0  
With an allowance recorded, Interest Recognized 0  
Commercial Loans [Member]    
Financing Receivable, Impaired [Line Items]    
With no related allowance recorded, Recorded Investment   35
With no related allowance recorded, Unpaid Principal Balance   55
With an allowance recorded, Recorded Investment   20
With an allowance recorded, Unpaid Principal Balance   20
With an allowance recorded, Related Allowance   20
Total, Recorded Investment   55
Total, Unpaid Principal Balance   75
Total, Related Allowance   20
With no related allowance recorded, Average Recorded Investment 37  
With no related allowance recorded, Interest Recognized 0  
With an allowance recorded, Average Recorded Investment 0  
With an allowance recorded, Interest Recognized 0  
Commercial Real Estate Loans [Member]    
Financing Receivable, Impaired [Line Items]    
With no related allowance recorded, Recorded Investment   2,306
With no related allowance recorded, Unpaid Principal Balance   2,312
With an allowance recorded, Recorded Investment   0
With an allowance recorded, Unpaid Principal Balance   0
With an allowance recorded, Related Allowance   0
Total, Recorded Investment   2,306
Total, Unpaid Principal Balance   2,312
Total, Related Allowance   0
With no related allowance recorded, Average Recorded Investment 181  
With no related allowance recorded, Interest Recognized 3  
With an allowance recorded, Average Recorded Investment 0  
With an allowance recorded, Interest Recognized 0  
Residential Real Estate Loans [Member]    
Financing Receivable, Impaired [Line Items]    
With no related allowance recorded, Recorded Investment   4,652
With no related allowance recorded, Unpaid Principal Balance   4,683
With an allowance recorded, Recorded Investment   0
With an allowance recorded, Unpaid Principal Balance   0
With an allowance recorded, Related Allowance   0
Total, Recorded Investment   4,652
Total, Unpaid Principal Balance   4,683
Total, Related Allowance   0
With no related allowance recorded, Average Recorded Investment 1,902  
With no related allowance recorded, Interest Recognized 17  
With an allowance recorded, Average Recorded Investment 4  
With an allowance recorded, Interest Recognized 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
With an allowance recorded, Unpaid Principal Balance   0
With an allowance recorded, Related Allowance   0
Total, Recorded Investment   0
Total, Unpaid Principal Balance   0
Total, Related Allowance   0
With no related allowance recorded, Average Recorded Investment 0  
With no related allowance recorded, Interest Recognized 0  
With an allowance recorded, Average Recorded Investment 0  
With an allowance recorded, Interest Recognized 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
With an allowance recorded, Unpaid Principal Balance   0
With an allowance recorded, Related Allowance   0
Total, Recorded Investment   0
Total, Unpaid Principal Balance   0
Total, Related Allowance   $ 0
With no related allowance recorded, Average Recorded Investment 0  
With no related allowance recorded, Interest Recognized 0  
With an allowance recorded, Average Recorded Investment 0  
With an allowance recorded, Interest Recognized $ 0