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, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Average impaired loans	$ 176,412	$ 95,188	$ 24,516
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	3,884	1,070	0
Private equity/venture capital
Financing Receivable, Impaired [Line Items]
Average impaired loans	0	0	0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0	0	0
Commercial loans
Financing Receivable, Impaired [Line Items]
Average impaired loans	174,688	94,975	23,976
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	3,867	1,070	0
Commercial loans \| Software and internet
Financing Receivable, Impaired [Line Items]
Average impaired loans	89,462	63,825	14,357
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	1,054	344	0
Commercial loans \| Hardware
Financing Receivable, Impaired [Line Items]
Average impaired loans	39,108	8,854	6,634
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	2,624	574	0
Commercial loans \| Life science/healthcare
Financing Receivable, Impaired [Line Items]
Average impaired loans	40,620	18,083	516
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	155	132	0
Commercial loans \| Premium wine
Financing Receivable, Impaired [Line Items]
Average impaired loans	2,056	1,455	1,381
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	28	12	0
Commercial loans \| Other
Financing Receivable, Impaired [Line Items]
Average impaired loans	3,442	2,758	1,088
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	6	8	0
Consumer loans
Financing Receivable, Impaired [Line Items]
Average impaired loans	1,724	213	540
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	17	0	0
Consumer loans \| Real estate secured consumer loans
Financing Receivable, Impaired [Line Items]
Average impaired loans	588	172	218
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	1,136	41	322
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	$ 17	$ 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=66008989&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=66008989&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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