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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, 2020
Dec. 31, 2019
Commercial And Industrial [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With no related allowance $ 1,008 $ 1,846
Unpaid Principal Balance With no related allowance 3,993 1,860
Average Recorded Investment With no related allowance 3,993 1,282
Interest Income Recognized With no related allowance 10 68
Recorded Investment With an allowance 2,246 2,726
Unpaid Principal Balance With an allowance 2,246 4,623
Related Allowance 69 600
Average Recorded Investment With an allowance 2,249 4,620
Interest Income Recognized With an allowance 91 56
Recorded Investment 3,254 4,572
Unpaid Principal Balance 6,239 6,483
Average Recorded Investment 6,242 5,902
Interest Income Recognized 101 124
Real Estate - Other [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With no related allowance   687
Unpaid Principal Balance With no related allowance   687
Average Recorded Investment With no related allowance   700
Interest Income Recognized With no related allowance   52
Recorded Investment   687
Unpaid Principal Balance   687
Average Recorded Investment   700
Interest Income Recognized   52
SBA [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With no related allowance 235 294
Unpaid Principal Balance With no related allowance 480 294
Average Recorded Investment With no related allowance 1,921 1,723
Recorded Investment With an allowance   50
Unpaid Principal Balance With an allowance   200
Related Allowance   50
Average Recorded Investment With an allowance   203
Interest Income Recognized With an allowance   15
Recorded Investment 235 344
Unpaid Principal Balance 480 494
Average Recorded Investment $ 1,921 1,926
Interest Income Recognized   $ 15