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Loans and Allowance For Loan Losses - Summary of Information Related to Impaired Loans (Detail) - Loans Receivable [Member] - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Commercial And Industrial [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With an allowance $ 1,163 $ 2,288
Unpaid Principal Balance With an allowance 1,163 2,288
Related Allowance 19 41
Average Recorded Investment With an allowance 1,041 2,137
Interest Income Recognized With an allowance 26 148
Recorded Investment 1,163 2,288
Unpaid Principal Balance 1,163 2,288
Average Recorded Investment 1,041 2,137
Interest Income Recognized 26 148
Real Estate - Other [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With no related allowance 1,000  
Unpaid Principal Balance With no related allowance 1,000  
Average Recorded Investment With no related allowance 1,000  
Interest Income Recognized With no related allowance 9  
Recorded Investment 1,000  
Unpaid Principal Balance 1,000  
Average Recorded Investment 1,000  
Interest Income Recognized 9  
SBA [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With no related allowance 234 234
Unpaid Principal Balance With no related allowance 757 479
Average Recorded Investment With no related allowance 2,282 1,917
Interest Income Recognized With no related allowance 18  
Recorded Investment With an allowance   455
Unpaid Principal Balance With an allowance   455
Related Allowance   259
Average Recorded Investment With an allowance   3,921
Interest Income Recognized With an allowance   57
Recorded Investment 234 689
Unpaid Principal Balance 757 934
Average Recorded Investment 2,282 5,838
Interest Income Recognized $ 18 $ 57