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Loans held for investment - Impaired Loans, Segregated by Class of Loans (Detail) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance $ 5,275 $ 2,569
Recorded Investment With No Allowance 5,005 2,062
Recorded Investment With Allowance 0 272
Total Recorded Investment 5,005 2,334
Related Allowance 0 39
Average Recorded Investment 3,671 5,006
Commercial Real Estate Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 4,971 2,265
Recorded Investment With No Allowance 4,809 1,990
Recorded Investment With Allowance 0 112
Total Recorded Investment 4,809 2,102
Related Allowance 0 3
Average Recorded Investment 3,457 4,683
Commercial Real Estate Portfolio Segment [Member] | Land Development And Construction Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 156 171
Recorded Investment With No Allowance 156 171
Total Recorded Investment 156 171
Average Recorded Investment 164 240
Commercial Real Estate Portfolio Segment [Member] | Farmland Loan [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 32 33
Recorded Investment With No Allowance 32 33
Total Recorded Investment 32 33
Average Recorded Investment 33 72
Commercial Real Estate Portfolio Segment [Member] | 1-4 Family Mortgages [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 570 767
Recorded Investment With No Allowance 570 767
Total Recorded Investment 570 767
Average Recorded Investment 669 892
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 4,213 1,294
Recorded Investment With No Allowance 4,051 1,019
Recorded Investment With Allowance 0 112
Total Recorded Investment 4,051 1,131
Related Allowance 0 3
Average Recorded Investment 2,591 3,479
Real Estate Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 304 304
Recorded Investment With No Allowance 196 72
Recorded Investment With Allowance 0 160
Total Recorded Investment 196 232
Related Allowance 0 36
Average Recorded Investment 214 323
Real Estate Loans [Member] | Commercial and Industrial Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 304 304
Recorded Investment With No Allowance 196 72
Recorded Investment With Allowance 0 160
Total Recorded Investment 196 232
Related Allowance 0 36
Average Recorded Investment $ 214 $ 323