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Allowances for Loan Losses - Summary of Impaired Loans (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Financing Receivable, Impaired [Line Items]          
With an allowance recorded, Related Allowance $ 102   $ 102   $ 132
Total, Recorded Investment 6,692   6,692   1,645
Total, Unpaid Principal Balance 6,692   6,692   1,645
Total, Related Allowance 102   102   132
With no related allowance recorded, Average Recorded Investment 3,773 $ 4,000 3,812 $ 4,030  
With no related allowance recorded, Interest Recognized 31 47 66 97  
With an allowance recorded, Average Recorded Investment 2,948 3,073 2,953 3,079  
With an allowance recorded, Interest Recognized 14 38 50 77  
Total, Average Recorded Investment 6,721 7,073 6,765 7,109  
Total, Interest Recognized 45 85 116 174  
Commercial and industrial [Member]          
Financing Receivable, Impaired [Line Items]          
With no related allowance recorded, Recorded Investment 526   526   0
With no related allowance recorded, Unpaid Principal Balance 526   526   0
With an allowance recorded, Recorded Investment 424   424   1,081
With an allowance recorded, Unpaid Principal Balance 424   424   1,081
With an allowance recorded, Related Allowance 45   45   111
Total, Recorded Investment 950   950   1,081
Total, Unpaid Principal Balance 950   950   1,081
Total, Related Allowance 45   45   111
With no related allowance recorded, Average Recorded Investment 548 762 584 783  
With no related allowance recorded, Interest Recognized 7 10 15 20  
With an allowance recorded, Average Recorded Investment 424 499 424 499  
With an allowance recorded, Interest Recognized 4 6 9 13  
Construction and land development [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  
Real estate - commercial [Member]          
Financing Receivable, Impaired [Line Items]          
With no related allowance recorded, Recorded Investment 2,431   2,431   230
With no related allowance recorded, Unpaid Principal Balance 2,431   2,431   230
With an allowance recorded, Recorded Investment 2,485   2,485   0
With an allowance recorded, Unpaid Principal Balance 2,485   2,485   0
With an allowance recorded, Related Allowance 37   37   0
Total, Recorded Investment 4,916   4,916   230
Total, Unpaid Principal Balance 4,916   4,916   230
Total, Related Allowance 37   37   0
With no related allowance recorded, Average Recorded Investment 2,435 2,426 2,435 2,431  
With no related allowance recorded, Interest Recognized 16 26 34 55  
With an allowance recorded, Average Recorded Investment 2,486 2,532 2,491 2,538  
With an allowance recorded, Interest Recognized 10 31 41 63  
Real estate - residential [Member]          
Financing Receivable, Impaired [Line Items]          
With no related allowance recorded, Recorded Investment 789   789   295
With no related allowance recorded, Unpaid Principal Balance 789   789   295
With an allowance recorded, Recorded Investment 34   34   36
With an allowance recorded, Unpaid Principal Balance 34   34   36
With an allowance recorded, Related Allowance 17   17   18
Total, Recorded Investment 823   823   331
Total, Unpaid Principal Balance 823   823   331
Total, Related Allowance 17   17   18
With no related allowance recorded, Average Recorded Investment 790 812 793 816  
With no related allowance recorded, Interest Recognized 8 11 17 22  
With an allowance recorded, Average Recorded Investment 35 38 35 38  
With an allowance recorded, Interest Recognized 0 1 0 1  
Real estate - home equity [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  
Consumer [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 3   3   3
With an allowance recorded, Unpaid Principal Balance 3   3   3
With an allowance recorded, Related Allowance 3   3   3
Total, Recorded Investment 3   3   3
Total, Unpaid Principal Balance 3   3   3
Total, Related Allowance 3   3   $ 3
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 3 4 3 4  
With an allowance recorded, Interest Recognized $ 0 $ 0 $ 0 $ 0