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Analysis of Impaired Loans by Class (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Principal Balance $ 72,007 $ 51,562  
Recorded Investment with No Allowance 37,193 24,443  
Recorded Investment with Allowance 21,846 14,796  
Total Recorded Investment 59,039 39,239  
Related Allowance 5,648 4,711 $ 5,113
Average Recorded Investment 49,139 55,247  
Real estate - residential [Member] | Prime [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Principal Balance 301 304  
Recorded Investment with No Allowance 193 197  
Recorded Investment with Allowance 95 95  
Total Recorded Investment 288 292  
Related Allowance 78 78  
Average Recorded Investment 290 303  
Commercial [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Principal Balance 38,722 40,402  
Recorded Investment with No Allowance 10,154 16,470  
Recorded Investment with Allowance 21,592 14,536  
Total Recorded Investment 31,746 31,006  
Related Allowance 5,547 4,605  
Average Recorded Investment 31,377 43,335  
Factoring [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Principal Balance 5,747    
Recorded Investment with No Allowance 5,747    
Total Recorded Investment 5,747    
Average Recorded Investment 2,873 275  
Construction [Member] | Real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Average Recorded Investment   55  
Real estate - commercial [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Principal Balance 26,887 10,856  
Recorded Investment with No Allowance 20,750 7,776  
Recorded Investment with Allowance 159 165  
Total Recorded Investment 20,909 7,941  
Related Allowance 23 28  
Average Recorded Investment 14,425 $ 11,279  
Other [Member] | Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Principal Balance 350    
Recorded Investment with No Allowance 349    
Total Recorded Investment 349    
Average Recorded Investment $ 174