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Loans and Allowance for Credit Losses - Analysis of Impaired Loans by Class (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance $ 66,334 $ 51,562
Recorded Investment with No Allowance 45,939 24,443
Recorded Investment with Allowance 5,877 14,796
Total Recorded Investment 51,816 39,239
Related Allowance 738 4,711
Average Recorded Investment 56,139 55,247
Commercial Portfolio [Member] | Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 32,301 40,402
Recorded Investment with No Allowance 20,986 16,470
Recorded Investment with Allowance 856 14,536
Total Recorded Investment 21,842 31,006
Related Allowance 271 4,605
Average Recorded Investment 31,271 43,335
Commercial Portfolio [Member] | Asset-based [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 948  
Recorded Investment with No Allowance 948  
Total Recorded Investment 948  
Average Recorded Investment 190  
Commercial Portfolio [Member] | Factoring [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 2,979  
Recorded Investment with No Allowance 2,979  
Total Recorded Investment 2,979  
Average Recorded Investment 3,917 275
Real Estate Portfolio [Member] | Construction [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 97  
Recorded Investment with No Allowance 95  
Total Recorded Investment 95  
Average Recorded Investment 19 55
Real Estate Portfolio [Member] | Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 28,258 10,856
Recorded Investment with No Allowance 19,314 7,776
Recorded Investment with Allowance 4,928 165
Total Recorded Investment 24,242 7,941
Related Allowance 387 28
Average Recorded Investment 19,826 11,279
Real Estate Portfolio [Member] | Residential [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 1,751 304
Recorded Investment with No Allowance 1,617 197
Recorded Investment with Allowance 93 95
Total Recorded Investment 1,710 292
Related Allowance 80 78
Average Recorded Investment 846 $ 303
Consumer Portfolio [Member] | Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Average Recorded Investment $ 70