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	6 Months Ended
Jun. 30, 2016 USD ($) troubled_debt_restructuring	Dec. 31, 2015 USD ($)
Financing Receivable, Modifications [Line Items]
Number of loans with concessions granted to borrowers \| troubled_debt_restructuring	17
Loans modified in TDRs	$ 78,271	$ 111,725
Unfunded commitments available for funding for modifications (less than)	3,500
Software and internet \| Commercial Portfolio Segment
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs	49,427	56,790
Hardware \| Commercial Portfolio Segment
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs	107	473
Life science/healthcare \| Commercial Portfolio Segment
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs	24,501	51,878
Premium wine \| Commercial Portfolio Segment
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs	2,983	2,065
Other \| Commercial Portfolio Segment
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs	467	519
Other \| Consumer Portfolio Segment
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs	786	0
Commercial loans \| Commercial Portfolio Segment
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs	77,485	111,725
Consumer loans \| Consumer Portfolio Segment
Financing Receivable, Modifications [Line Items]
Loans modified in TDRs	$ 786	$ 0

Total commitments available for funding to clients with financing receivables modified by troubled debt restructurings.

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+ References

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Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953676-111524

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The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554

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