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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 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
troubled_debt_restructuring
Financing Receivable, Modifications [Line Items]        
Modifications, Unfunded Commitments Available For Funding $ 1,400   $ 1,400  
Financing Receivable, Modifications, Number of Contracts | troubled_debt_restructuring       18
Financing receivable modifications recorded investment modified during period 20,913 $ 5,188 27,020 $ 6,817
Loans classified as TDRs, charge-offs 12,500 500 15,100 4,300
Financing receivable modifications recorded investment subsequently defaulted 190 1,980 190 1,980
Commercial loans        
Financing Receivable, Modifications [Line Items]        
Financing receivable modifications recorded investment modified during period 20,913 4,402 27,020 6,031
Commercial Portfolio Segment | Software/internet        
Financing Receivable, Modifications [Line Items]        
Financing receivable modifications recorded investment modified during period 16,135 4,402 22,242 5,525
Financing receivable modifications recorded investment subsequently defaulted 0 1,474 0 1,474
Commercial Portfolio Segment | Life science/healthcare        
Financing Receivable, Modifications [Line Items]        
Financing receivable modifications recorded investment modified during period 4,588 0 4,588 0
Consumer Portfolio Segment | Other        
Financing Receivable, Modifications [Line Items]        
Financing receivable modifications recorded investment modified during period 0 $ 786 0 786
Payment deferrals granted        
Financing Receivable, Modifications [Line Items]        
Financing receivable modifications recorded investment modified during period $ 20,900   $ 27,000 5,700
Principal Forgiveness [Member]        
Financing Receivable, Modifications [Line Items]        
Financing receivable modifications recorded investment modified during period       $ 1,100