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Allowance for Credit Losses - Summary of Impaired Loans (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 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 $ 5,577 $ 5,744  
With no related allowance recorded, Interest Recognized 106 165  
With an allowance recorded, Average Recorded Investment 176 177  
With an allowance recorded, Interest Recognized 3 5  
Total, Average Recorded Investment 5,753 5,921  
Total, Interest Recognized 109 170  
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 133 210  
With no related allowance recorded, Interest Recognized 5 8  
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     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 35  
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     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 2,421 2,451  
With no related allowance recorded, Interest Recognized 65 100  
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     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 2,986 3,048  
With no related allowance recorded, Interest Recognized 36 57  
With an allowance recorded, Average Recorded Investment 174 175  
With an allowance recorded, Interest Recognized 3 5  
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 0  
With no related allowance recorded, Interest Recognized 0 0  
With an allowance recorded, Average Recorded Investment 2 2  
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
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 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