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Loans and Loans Held for Sale - Summary of Restructured Loans (Detail)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
tdr
Sep. 30, 2015
USD ($)
tdr
Sep. 30, 2016
USD ($)
tdr
Sep. 30, 2015
USD ($)
tdr
Dec. 31, 2015
USD ($)
Receivables [Abstract]          
Loans Receivable Held-for-sale, Reconciliation to Cash Flow, Period Increase (Decrease)     $ 23,600    
Gain on sale of credit card portfolio $ 0 $ 0 $ 2,066 $ 0  
Financing Receivable, Modifications [Line Items]          
Threshold period of satisfactory performance for troubled debt restructuring to be restored to accruing status     6 months    
Restructured loans [1] $ 5,003 $ 1,578 $ 15,775 $ 5,353  
Number of troubled debt restructuring loans returned back to accruing status | tdr 0 6 0 6  
Amount of troubled debt restructuring loans returned back to accruing status   $ 300   $ 300  
Installment and Other Consumer          
Receivables [Abstract]          
Loans Receivable Held-for-sale, Reconciliation to Cash Flow, Period Increase (Decrease)     $ 25,000    
Gain on sale of credit card portfolio     2,100    
Financing Receivable          
Financing Receivable, Modifications [Line Items]          
Restructured loans     28,031   $ 31,614
Financing Receivable | Commercial and Industrial          
Financing Receivable, Modifications [Line Items]          
Restructured loans     7,870   7,891
Financing Receivable | Commercial Real Estate          
Financing Receivable, Modifications [Line Items]          
Restructured loans     3,920   10,370
Financing Receivable | Commercial Construction          
Financing Receivable, Modifications [Line Items]          
Restructured loans     4,452   6,278
Financing Receivable | Residential Mortgage          
Financing Receivable, Modifications [Line Items]          
Restructured loans     7,701   3,255
Financing Receivable | Home Equity          
Financing Receivable, Modifications [Line Items]          
Restructured loans     4,057   3,707
Financing Receivable | Installment and Other Consumer          
Financing Receivable, Modifications [Line Items]          
Restructured loans     31   113
Performing Financial Instruments          
Financing Receivable, Modifications [Line Items]          
Restructured loans     12,936   23,955
Performing Financial Instruments | Commercial and Industrial          
Financing Receivable, Modifications [Line Items]          
Restructured loans     863   6,321
Performing Financial Instruments | Commercial Real Estate          
Financing Receivable, Modifications [Line Items]          
Restructured loans     3,054   6,822
Performing Financial Instruments | Commercial Construction          
Financing Receivable, Modifications [Line Items]          
Restructured loans     3,460   5,013
Performing Financial Instruments | Residential Mortgage          
Financing Receivable, Modifications [Line Items]          
Restructured loans     2,453   2,590
Performing Financial Instruments | Home Equity          
Financing Receivable, Modifications [Line Items]          
Restructured loans     3,084   3,184
Performing Financial Instruments | Installment and Other Consumer          
Financing Receivable, Modifications [Line Items]          
Restructured loans     22   25
Nonperforming Financial Instruments          
Financing Receivable, Modifications [Line Items]          
Restructured loans     15,095   7,659
Nonperforming Financial Instruments | Commercial and Industrial          
Financing Receivable, Modifications [Line Items]          
Restructured loans     7,007   1,570
Nonperforming Financial Instruments | Commercial Real Estate          
Financing Receivable, Modifications [Line Items]          
Restructured loans     866   3,548
Nonperforming Financial Instruments | Commercial Construction          
Financing Receivable, Modifications [Line Items]          
Restructured loans     992   1,265
Nonperforming Financial Instruments | Residential Mortgage          
Financing Receivable, Modifications [Line Items]          
Restructured loans     5,248   665
Nonperforming Financial Instruments | Home Equity          
Financing Receivable, Modifications [Line Items]          
Restructured loans     973   523
Nonperforming Financial Instruments | Installment and Other Consumer          
Financing Receivable, Modifications [Line Items]          
Restructured loans     $ 9   $ 88
[1] Excludes loans that were fully paid off or fully charged-off by period end. The pre-modification balance represents the balance outstanding prior to modification. The post-modification balance represents the outstanding balance at period end.