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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
Mar. 31, 2018
USD ($)
troubled_debt_restructuring
Mar. 31, 2017
USD ($)
Financing Receivable, Modifications [Line Items]    
Modifications, Unfunded Commitments Available For Funding $ 400  
Financing Receivable, Modifications, Number of Contracts | troubled_debt_restructuring 21  
Financing receivable modifications recorded investment modified during period $ 3,880 $ 6,309
Loans classified as TDRs, charge-offs 0 6,200
Financing receivable modifications recorded investment subsequently defaulted 3,032 3,641
Commercial loans    
Financing Receivable, Modifications [Line Items]    
Financing receivable modifications recorded investment modified during period 3,554 6,309
Financing receivable modifications recorded investment subsequently defaulted 3,032 3,105
Commercial Portfolio Segment | Software/internet    
Financing Receivable, Modifications [Line Items]    
Financing receivable modifications recorded investment modified during period 756 6,309
Financing receivable modifications recorded investment subsequently defaulted 3,032 0
Commercial Portfolio Segment | Hardware    
Financing Receivable, Modifications [Line Items]    
Financing receivable modifications recorded investment modified during period 1,559 0
Financing receivable modifications recorded investment subsequently defaulted 0 3,105
Commercial Portfolio Segment | Life science/healthcare    
Financing Receivable, Modifications [Line Items]    
Financing receivable modifications recorded investment modified during period 1,239 0
Consumer Portfolio Segment | Other    
Financing Receivable, Modifications [Line Items]    
Financing receivable modifications recorded investment modified during period 326 0
Financing receivable modifications recorded investment subsequently defaulted 0 536
Payment deferrals granted    
Financing Receivable, Modifications [Line Items]    
Financing receivable modifications recorded investment modified during period $ 3,900 $ 6,300