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Analysis of Impaired Loans by Class (Detail) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Principal Balance $ 93,743 $ 102,398  
Recorded Investment with No Allowance 37,622 52,907  
Recorded Investment with Allowance 14,725 21,869  
Total Recorded Investment 52,347 74,776  
Related Allowance 4,461 6,683 $ 8,436
Average Recorded Investment 63,552 76,475  
Real estate - residential [Member] | Prime [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Principal Balance 311 427  
Recorded Investment with No Allowance 203 321  
Recorded Investment with Allowance 96 97  
Total Recorded Investment 299 418  
Related Allowance 76 75  
Average Recorded Investment 309 221  
Commercial [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Principal Balance 76,063 84,749  
Recorded Investment with No Allowance 27,143 44,525  
Recorded Investment with Allowance 14,413 16,465  
Total Recorded Investment 41,556 60,990  
Related Allowance 4,340 6,299  
Average Recorded Investment 50,064 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 458 207  
Construction [Member] | Real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Principal Balance 108 108  
Recorded Investment with No Allowance 93 93  
Total Recorded Investment 93 93  
Average Recorded Investment 93 148  
Real estate - commercial [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Principal Balance 17,261 16,284  
Recorded Investment with No Allowance 10,183 7,968  
Recorded Investment with Allowance 216 4,477  
Total Recorded Investment 10,399 12,445  
Related Allowance 45 3  
Average Recorded Investment $ 12,628 10,506  
Other [Member] | Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Average Recorded Investment   $ 8