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Allowances for Loan Losses - Summary of Impaired Loans (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Financing Receivable, Impaired [Line Items]    
With an allowance recorded, Related Allowance $ 0 $ 0
Total, Recorded Investment 751 297
Total, Unpaid Principal Balance 840 339
Total, Related Allowance 0 0
With an allowance recorded, Average Recorded Investment 0 0
With an allowance recorded, Interest Recognized 0 0
Total, Average Recorded Investment 759 348
Total, Interest Recognized 20 12
Agriculture Loans [Member]    
Financing Receivable, Impaired [Line Items]    
With no related allowance recorded, Recorded Investment 0 0
With no related allowance recorded, Unpaid Principal Balance 0 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  
With an allowance recorded, Interest Recognized 0  
Commercial Loans [Member]    
Financing Receivable, Impaired [Line Items]    
With no related allowance recorded, Recorded Investment 42 2
With no related allowance recorded, Unpaid Principal Balance 61 7
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 42 2
Total, Unpaid Principal Balance 61 7
Total, Related Allowance 0 0
With no related allowance recorded, Average Recorded Investment   3
With no related allowance recorded, Interest Recognized 0 1
With an allowance recorded, Average Recorded Investment 0 0
With an allowance recorded, Interest Recognized 0 0
Construction and land development [Member]    
Financing Receivable, Impaired [Line Items]    
With no related allowance recorded, Average Recorded Investment 759 348
With no related allowance recorded, Interest Recognized 20 12
Commercial Real Estate Loans [Member]    
Financing Receivable, Impaired [Line Items]    
With no related allowance recorded, Recorded Investment 0 0
With no related allowance recorded, Unpaid Principal Balance 0 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
Residential Real Estate Loans [Member]    
Financing Receivable, Impaired [Line Items]    
With no related allowance recorded, Recorded Investment 709 295
With no related allowance recorded, Unpaid Principal Balance 779 332
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 709 295
Total, Unpaid Principal Balance 779 332
Total, Related Allowance 0 0
With no related allowance recorded, Average Recorded Investment 759 345
With no related allowance recorded, Interest Recognized 20 11
With an allowance recorded, Average Recorded Investment 0 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 0
With no related allowance recorded, Unpaid Principal Balance 0 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 0
With no related allowance recorded, Unpaid Principal Balance 0 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