Loans and Allowance for Loan Losses - Allowance for Loan Losses Individually and Collectively Evaluated for Impairment (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Impaired [Line Items]
Individually Evaluated for Impairment, Allowance for loan losses	$ 64,791	$ 57,773
Individually Evaluated for Impairment, Recorded investment in loans	173,659	182,684
Collectively Evaluated for Impairment, Allowance for loan losses	179,932	159,840
Collectively Evaluated for Impairment, Allowance for loan losses	18,660,119	16,559,386
Commercial Portfolio Segment \| Software and internet
Financing Receivable, Impaired [Line Items]
Individually Evaluated for Impairment, Allowance for loan losses	33,705	34,098
Individually Evaluated for Impairment, Recorded investment in loans	93,971	100,866
Collectively Evaluated for Impairment, Allowance for loan losses	70,524	68,947
Collectively Evaluated for Impairment, Allowance for loan losses	5,436,903	5,337,049
Commercial Portfolio Segment \| Hardware
Financing Receivable, Impaired [Line Items]
Individually Evaluated for Impairment, Allowance for loan losses	2,327	3,160
Individually Evaluated for Impairment, Recorded investment in loans	22,751	27,736
Collectively Evaluated for Impairment, Allowance for loan losses	21,544	19,925
Collectively Evaluated for Impairment, Allowance for loan losses	1,100,682	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	49,807	35,282
Collectively Evaluated for Impairment, Allowance for loan losses	7,078,544	5,467,577
Commercial Portfolio Segment \| Life science/healthcare
Financing Receivable, Impaired [Line Items]
Individually Evaluated for Impairment, Allowance for loan losses	23,380	20,230
Individually Evaluated for Impairment, Recorded investment in loans	49,265	51,354
Collectively Evaluated for Impairment, Allowance for loan losses	18,472	16,346
Collectively Evaluated for Impairment, Allowance for loan losses	1,731,709	1,659,288
Commercial Portfolio Segment \| Premium wine
Financing Receivable, Impaired [Line Items]
Individually Evaluated for Impairment, Allowance for loan losses	130	90
Individually Evaluated for Impairment, Recorded investment in loans	1,296	2,065
Collectively Evaluated for Impairment, Allowance for loan losses	4,680	5,115
Collectively Evaluated for Impairment, Allowance for loan losses	827,940	845,230
Commercial Portfolio Segment \| Other
Financing Receivable, Impaired [Line Items]
Individually Evaluated for Impairment, Allowance for loan losses	5,047	52
Individually Evaluated for Impairment, Recorded investment in loans	5,467	520
Collectively Evaluated for Impairment, Allowance for loan losses	4,433	4,200
Collectively Evaluated for Impairment, Allowance for loan losses	497,054	435,270
Commercial Portfolio Segment \| Commercial loans
Financing Receivable, Impaired [Line Items]
Individually Evaluated for Impairment, Allowance for loan losses	64,589	57,630
Individually Evaluated for Impairment, Recorded investment in loans	172,750	182,541
Collectively Evaluated for Impairment, Allowance for loan losses	169,460	149,815
Collectively Evaluated for Impairment, Allowance for loan losses	16,672,832	14,788,206
Consumer Portfolio Segment \| Consumer loans
Financing Receivable, Impaired [Line Items]
Individually Evaluated for Impairment, Allowance for loan losses	202	143
Individually Evaluated for Impairment, Recorded investment in loans	909	143
Collectively Evaluated for Impairment, Allowance for loan losses	10,472	10,025
Collectively Evaluated for Impairment, Allowance for loan losses	$ 1,987,287	$ 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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- Definition

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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