Loans and Allowance for Loan Losses - Allowance for Loan Losses Individually and Collectively Evaluated for Impairment (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Financing Receivable, Impaired [Line Items]
Individually Evaluated for Impairment, Allowance for loan losses	$ 56,805	$ 57,773
Individually Evaluated for Impairment, Recorded investment in loans	178,462	182,684
Collectively Evaluated for Impairment, Allowance for loan losses	173,444	159,840
Collectively Evaluated for Impairment, Allowance for loan losses	17,556,685	16,559,386
Commercial Portfolio Segment \| Software and internet
Financing Receivable, Impaired [Line Items]
Individually Evaluated for Impairment, Allowance for loan losses	36,886	34,098
Individually Evaluated for Impairment, Recorded investment in loans	109,432	100,866
Collectively Evaluated for Impairment, Allowance for loan losses	70,012	68,947
Collectively Evaluated for Impairment, Allowance for loan losses	5,345,120	5,337,049
Commercial Portfolio Segment \| Hardware
Financing Receivable, Impaired [Line Items]
Individually Evaluated for Impairment, Allowance for loan losses	2,872	3,160
Individually Evaluated for Impairment, Recorded investment in loans	27,916	27,736
Collectively Evaluated for Impairment, Allowance for loan losses	20,964	19,925
Collectively Evaluated for Impairment, Allowance for loan losses	1,029,017	1,043,792
Commercial Portfolio Segment \| Private equity/venture capital
Financing Receivable, Impaired [Line Items]
Individually Evaluated for Impairment, Allowance for loan losses	0	0
Individually Evaluated for Impairment, Recorded investment in loans	0	0
Collectively Evaluated for Impairment, Allowance for loan losses	43,686	35,282
Collectively Evaluated for Impairment, Allowance for loan losses	6,299,608	5,467,577
Commercial Portfolio Segment \| Life science/healthcare
Financing Receivable, Impaired [Line Items]
Individually Evaluated for Impairment, Allowance for loan losses	11,735	20,230
Individually Evaluated for Impairment, Recorded investment in loans	33,040	51,354
Collectively Evaluated for Impairment, Allowance for loan losses	18,550	16,346
Collectively Evaluated for Impairment, Allowance for loan losses	1,694,952	1,659,288
Commercial Portfolio Segment \| Premium wine
Financing Receivable, Impaired [Line Items]
Individually Evaluated for Impairment, Allowance for loan losses	129	90
Individually Evaluated for Impairment, Recorded investment in loans	2,427	2,065
Collectively Evaluated for Impairment, Allowance for loan losses	5,115	5,115
Collectively Evaluated for Impairment, Allowance for loan losses	835,483	845,230
Commercial Portfolio Segment \| Other
Financing Receivable, Impaired [Line Items]
Individually Evaluated for Impairment, Allowance for loan losses	5,052	52
Individually Evaluated for Impairment, Recorded investment in loans	5,516	520
Collectively Evaluated for Impairment, Allowance for loan losses	4,495	4,200
Collectively Evaluated for Impairment, Allowance for loan losses	470,690	435,270
Commercial Portfolio Segment \| Commercial loans
Financing Receivable, Impaired [Line Items]
Individually Evaluated for Impairment, Allowance for loan losses	56,674	57,630
Individually Evaluated for Impairment, Recorded investment in loans	178,331	182,541
Collectively Evaluated for Impairment, Allowance for loan losses	162,822	149,815
Collectively Evaluated for Impairment, Allowance for loan losses	15,674,870	14,788,206
Consumer Portfolio Segment
Financing Receivable, Impaired [Line Items]
Individually Evaluated for Impairment, Allowance for loan losses	131	143
Individually Evaluated for Impairment, Recorded investment in loans	131	143
Collectively Evaluated for Impairment, Allowance for loan losses	10,622	10,025
Collectively Evaluated for Impairment, Allowance for loan losses	$ 1,881,815	$ 1,771,180

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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The balance of financing receivables that were collectively evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

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The balance of financing receivables that were individually evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

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