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Loans and Allowance for Loan Losses - Summary of Loans Modified in Troubled Debt Restructurings ("TDRs") by Portfolio Segment and Class of Financing Receivables (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
Dec. 31, 2015
USD ($)
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Number of Contracts | troubled_debt_restructuring       19  
Loans modified in TDRs $ 76,044   $ 76,044   $ 111,725
Modifications, Unfunded Commitments Available For Funding 4,700   4,700    
Loans classified as TDRs, charge-offs 700 $ 22,400 3,500 $ 22,400  
Financing receivable modifications recorded investment modified during period 12,121 81,797 17,893 89,845  
Software and internet | Commercial Portfolio Segment          
Financing Receivable, Modifications [Line Items]          
Loans modified in TDRs 36,517   36,517   56,790
Financing receivable modifications recorded investment modified during period 78 51,749 4,569 57,766  
Hardware | Commercial Portfolio Segment          
Financing Receivable, Modifications [Line Items]          
Loans modified in TDRs 10,333   10,333   473
Financing receivable modifications recorded investment modified during period 10,329 0 10,329 2,031  
Life science/healthcare | Commercial Portfolio Segment          
Financing Receivable, Modifications [Line Items]          
Loans modified in TDRs 25,029   25,029   51,878
Financing receivable modifications recorded investment modified during period 1,714 29,530 1,714 29,530  
Premium wine | Commercial Portfolio Segment          
Financing Receivable, Modifications [Line Items]          
Loans modified in TDRs 2,962   2,962   2,065
Financing receivable modifications recorded investment modified during period 0 0 495 0  
Other | Commercial Portfolio Segment          
Financing Receivable, Modifications [Line Items]          
Loans modified in TDRs 417   417   519
Financing receivable modifications recorded investment modified during period 0 518 0 518  
Other | Consumer Portfolio Segment          
Financing Receivable, Modifications [Line Items]          
Loans modified in TDRs 786   786   0
Financing receivable modifications recorded investment modified during period 0 0 786 0  
Commercial loans          
Financing Receivable, Modifications [Line Items]          
Financing receivable modifications recorded investment modified during period 12,121 81,797 17,107 89,845  
Commercial loans | Commercial Portfolio Segment          
Financing Receivable, Modifications [Line Items]          
Loans modified in TDRs 75,258   75,258   111,725
Consumer loans | Consumer Portfolio Segment          
Financing Receivable, Modifications [Line Items]          
Loans modified in TDRs 786   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  
Principal Forgiveness [Member]          
Financing Receivable, Modifications [Line Items]          
Financing receivable modifications recorded investment modified during period $ 100   $ 300