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Analysis of Impaired Loans by Class (Detail) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Principal Balance $ 60,196 $ 102,398  
Recorded Investment with No Allowance 31,115 52,907  
Recorded Investment with Allowance 15,224 21,869  
Total Recorded Investment 46,339 74,776  
Related Allowance 4,610 6,683 $ 3,185
Average Recorded Investment 59,249 76,475  
Real estate - residential [Member] | Prime [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Principal Balance 306 427  
Recorded Investment with No Allowance 200 321  
Recorded Investment with Allowance 95 97  
Total Recorded Investment 295 418  
Related Allowance 77 75  
Average Recorded Investment 306 221  
Commercial [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Principal Balance 46,484 84,749  
Recorded Investment with No Allowance 20,731 44,525  
Recorded Investment with Allowance 14,743 16,465  
Total Recorded Investment 35,474 60,990  
Related Allowance 4,454 6,299  
Average Recorded Investment 46,417 65,385  
Factoring [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Principal Balance   830  
Recorded Investment with Allowance   830  
Total Recorded Investment   830  
Related Allowance   306  
Average Recorded Investment 343 207  
Construction [Member] | Real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Principal Balance   108  
Recorded Investment with No Allowance   93  
Total Recorded Investment   93  
Average Recorded Investment 70 148  
Real estate - commercial [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Principal Balance 13,406 16,284  
Recorded Investment with No Allowance 10,184 7,968  
Recorded Investment with Allowance 386 4,477  
Total Recorded Investment 10,570 12,445  
Related Allowance 79 3  
Average Recorded Investment $ 12,113 10,506  
Other [Member] | Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Average Recorded Investment   $ 8