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Loans, Allowance for Loan Losses and Allowance for Unfunded Credit Commitments - Recorded Investment in Loans Modified in TDRs (Detail)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
troubled_debt_restructuring
Sep. 30, 2016
USD ($)
Financing Receivable, Modifications [Line Items]        
Modifications, Unfunded Commitments Available For Funding $ 1,200   $ 1,200  
Financing Receivable, Modifications, Number of Contracts | troubled_debt_restructuring     18  
Financing receivable modifications recorded investment modified during period 11,272 $ 12,121 $ 26,615 $ 17,893
Loans classified as TDRs, charge-offs 0 700 2,600 3,500
Financing receivable modifications recorded investment subsequently defaulted 1,420 790 1,420 1,374
Commercial loans        
Financing Receivable, Modifications [Line Items]        
Financing receivable modifications recorded investment modified during period 11,272 12,121 26,615 17,107
Commercial Portfolio Segment | Software/internet        
Financing Receivable, Modifications [Line Items]        
Financing receivable modifications recorded investment modified during period 10,876 78 26,034 4,569
Financing receivable modifications recorded investment subsequently defaulted 1,234 0 1,234 584
Commercial Portfolio Segment | Hardware        
Financing Receivable, Modifications [Line Items]        
Financing receivable modifications recorded investment modified during period 396 10,329 396 10,329
Commercial Portfolio Segment | Life science/healthcare        
Financing Receivable, Modifications [Line Items]        
Financing receivable modifications recorded investment modified during period 0 1,714 0 1,714
Consumer Portfolio Segment | Other        
Financing Receivable, Modifications [Line Items]        
Financing receivable modifications recorded investment modified during period 0 0 0 786
Payment deferrals granted        
Financing Receivable, Modifications [Line Items]        
Financing receivable modifications recorded investment modified during period $ 11,300 12,000 $ 26,600 17,600
Principal Forgiveness [Member]        
Financing Receivable, Modifications [Line Items]        
Financing receivable modifications recorded investment modified during period   $ 100   $ 300