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Loans and Allowance for Loan Losses - Recorded Investment in Loans Modified in TDRs (Detail)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
troubled_debt_restructuring
Financing Receivable, Modifications [Line Items]        
Modifications, Unfunded Commitments Available For Funding $ 4,700   $ 4,700  
Financing Receivable, Modifications, Number of Contracts | troubled_debt_restructuring       19
Financing receivable modifications recorded investment modified during period 12,121 $ 81,797 17,893 $ 89,845
Loans classified as TDRs, charge-offs 700 22,400 3,500 22,400
Financing receivable modifications recorded investment subsequently defaulted 790 14,096 1,374 20,113
Commercial loans        
Financing Receivable, Modifications [Line Items]        
Financing receivable modifications recorded investment modified during period 12,121 81,797 17,107 89,845
Commercial Portfolio Segment | Software and internet        
Financing Receivable, Modifications [Line Items]        
Financing receivable modifications recorded investment modified during period 78 51,749 4,569 57,766
Financing receivable modifications recorded investment subsequently defaulted 0 11,107 584 17,124
Commercial Portfolio Segment | Hardware        
Financing Receivable, Modifications [Line Items]        
Financing receivable modifications recorded investment modified during period 10,329 0 10,329 2,031
Financing receivable modifications recorded investment subsequently defaulted 0 2,031 0 2,031
Commercial Portfolio Segment | Life science/healthcare        
Financing Receivable, Modifications [Line Items]        
Financing receivable modifications recorded investment modified during period 1,714 29,530 1,714 29,530
Financing receivable modifications recorded investment subsequently defaulted 0 958 0 958
Commercial Portfolio Segment | Other        
Financing Receivable, Modifications [Line Items]        
Financing receivable modifications recorded investment modified during period 0 518 0 518
Consumer Portfolio Segment | Other        
Financing Receivable, Modifications [Line Items]        
Financing receivable modifications recorded investment modified during period 0 0 786 0
Payment deferrals granted        
Financing Receivable, Modifications [Line Items]        
Financing receivable modifications recorded investment modified during period $ 12,000 $ 81,800 $ 17,600 $ 89,800