Loans and Allowance for Loan Losses - Average Impaired Loans, Broken out by Portfolio Segment and Class of Financing Receivable (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Average impaired loans	$ 95,188	$ 24,516	$ 40,846
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	1,070	0	0
Private equity/venture capital
Financing Receivable, Impaired [Line Items]
Average impaired loans	0	0	37
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0	0	0
Commercial loans
Financing Receivable, Impaired [Line Items]
Average impaired loans	94,975	23,976	36,944
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	1,070	0	0
Commercial loans \| Software and internet
Financing Receivable, Impaired [Line Items]
Average impaired loans	63,825	14,357	6,254
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	344	0	0
Commercial loans \| Hardware
Financing Receivable, Impaired [Line Items]
Average impaired loans	8,854	6,634	24,508
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	574	0	0
Commercial loans \| Life science/healthcare
Financing Receivable, Impaired [Line Items]
Average impaired loans	18,083	516	334
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	132	0	0
Commercial loans \| Premium wine
Financing Receivable, Impaired [Line Items]
Average impaired loans	1,455	1,381	2,210
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	12	0	0
Commercial loans \| Other
Financing Receivable, Impaired [Line Items]
Average impaired loans	2,758	1,088	3,601
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	8	0	0
Consumer loans
Financing Receivable, Impaired [Line Items]
Average impaired loans	213	540	3,902
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0	0	0
Consumer loans \| Real estate secured consumer loans
Financing Receivable, Impaired [Line Items]
Average impaired loans	172	218	2,957
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0	0	0
Consumer loans \| Other Loans
Financing Receivable, Impaired [Line Items]
Average impaired loans	41	322	945
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	$ 0	$ 0	$ 0

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- Definition

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5258-111524

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Amount of interest income, recognized on accrual basis, on financing receivables, for which there is a related allowance for credit losses and are recognized as impaired.

+ References

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