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Allowances for Loan Losses - Summary of Impaired Loans (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Financing Receivable, Impaired [Line Items]          
With an allowance recorded, Related Allowance $ 0   $ 0   $ 0
Total, Recorded Investment 136   136   248
Total, Unpaid Principal Balance 170   170   292
Total, Related Allowance 0   0   0
With no related allowance recorded, Average Recorded Investment 138 $ 326      
With no related allowance recorded, Interest Recognized 0 1      
With an allowance recorded, Average Recorded Investment 0 48 0 $ 48  
With an allowance recorded, Interest Recognized 0 0 0 0  
Total, Average Recorded Investment 138 374 141 382  
Total, Interest Recognized 0 1 0 4  
Agriculture Loans [Member]          
Financing Receivable, Impaired [Line Items]          
With no related allowance recorded, Recorded Investment 0   0   0
With no related allowance recorded, Unpaid Principal Balance 0   0   0
With an allowance recorded, Recorded Investment 0   0   0
With an allowance recorded, Unpaid Principal Balance 0   0   0
With an allowance recorded, Related Allowance 0   0   0
Total, Recorded Investment 0   0   0
Total, Unpaid Principal Balance 0   0   0
Total, Related Allowance 0   0   0
With no related allowance recorded, Average Recorded Investment 0 0 0 0  
With no related allowance recorded, Interest Recognized 0 0 0 0  
With an allowance recorded, Average Recorded Investment 0 0 0 0  
With an allowance recorded, Interest Recognized 0 0 0 0  
Commercial Loans [Member]          
Financing Receivable, Impaired [Line Items]          
With no related allowance recorded, Recorded Investment 0   0   1
With no related allowance recorded, Unpaid Principal Balance 0   0   6
With an allowance recorded, Recorded Investment 0   0   0
With an allowance recorded, Unpaid Principal Balance 0   0   0
With an allowance recorded, Related Allowance 0   0   0
Total, Recorded Investment 0   0   1
Total, Unpaid Principal Balance 0   0   6
Total, Related Allowance 0   0   0
With no related allowance recorded, Average Recorded Investment 0 0 0 0  
With no related allowance recorded, Interest Recognized 0 0 0 0  
With an allowance recorded, Average Recorded Investment 0 3 0 3  
With an allowance recorded, Interest Recognized 0 0 0 0  
Construction and land development [Member]          
Financing Receivable, Impaired [Line Items]          
With an allowance recorded, Average Recorded Investment     141 334  
With an allowance recorded, Interest Recognized     0 4  
Commercial Real Estate Loans [Member]          
Financing Receivable, Impaired [Line Items]          
With no related allowance recorded, Recorded Investment 0   0   0
With no related allowance recorded, Unpaid Principal Balance 0   0   0
With an allowance recorded, Recorded Investment 0   0   0
With an allowance recorded, Unpaid Principal Balance 0   0   0
With an allowance recorded, Related Allowance 0   0   0
Total, Recorded Investment 0   0   0
Total, Unpaid Principal Balance 0   0   0
Total, Related Allowance 0   0   0
With no related allowance recorded, Average Recorded Investment 0 0 0 0  
With no related allowance recorded, Interest Recognized 0   0 0  
With an allowance recorded, Average Recorded Investment 0 0 0 0  
With an allowance recorded, Interest Recognized 0 0 0 0  
Residential Real Estate Loans [Member]          
Financing Receivable, Impaired [Line Items]          
With no related allowance recorded, Recorded Investment 136   136   247
With no related allowance recorded, Unpaid Principal Balance 170   170   286
With an allowance recorded, Recorded Investment 0   0   0
With an allowance recorded, Unpaid Principal Balance 0   0   0
With an allowance recorded, Related Allowance 0   0   0
Total, Recorded Investment 136   136   247
Total, Unpaid Principal Balance 170   170   286
Total, Related Allowance 0   0   0
With no related allowance recorded, Average Recorded Investment 138 326 141 334  
With no related allowance recorded, Interest Recognized 0 1 0 4  
With an allowance recorded, Average Recorded Investment 0 45 0 45  
With an allowance recorded, Interest Recognized 0 0 0 0  
Consumer Loans [Member]          
Financing Receivable, Impaired [Line Items]          
With no related allowance recorded, Recorded Investment 0   0   0
With no related allowance recorded, Unpaid Principal Balance 0   0   0
With an allowance recorded, Recorded Investment 0   0   0
With an allowance recorded, Unpaid Principal Balance 0   0   0
With an allowance recorded, Related Allowance 0   0   0
Total, Recorded Investment 0   0   0
Total, Unpaid Principal Balance 0   0   0
Total, Related Allowance 0   0   0
With no related allowance recorded, Average Recorded Investment 0 0 0 0  
With no related allowance recorded, Interest Recognized 0   0 0  
With an allowance recorded, Average Recorded Investment 0 0      
With an allowance recorded, Interest Recognized 0 0      
Total, Average Recorded Investment     0 0  
Total, Interest Recognized     0 0  
Municipal Loans [Member]          
Financing Receivable, Impaired [Line Items]          
With no related allowance recorded, Recorded Investment 0   0   0
With no related allowance recorded, Unpaid Principal Balance 0   0   0
With an allowance recorded, Recorded Investment 0   0   0
With an allowance recorded, Unpaid Principal Balance 0   0   0
With an allowance recorded, Related Allowance 0   0   0
Total, Recorded Investment 0   0   0
Total, Unpaid Principal Balance 0   0   0
Total, Related Allowance 0   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 0 0  
With an allowance recorded, Interest Recognized $ 0 $ 0 $ 0 $ 0