Loans, Allowance for Loan Losses and Allowance for Unfunded Credit Commitments - Allowance for Loan Losses Individually and Collectively Evaluated for Impairment (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Financing Receivable, Impaired [Line Items]
Individually evaluated for impairment, allowance for loan losses	$ 56,781	$ 48,825
Individually evaluated for impairment, recorded investment in loans	202,616	234,460
Collectively evaluated for impairment, allowance for loan losses	186,349	176,541
Collectively evaluated for impairment, allowance for loan losses	20,224,835	19,665,484
Commercial Portfolio Segment \| Software/internet
Financing Receivable, Impaired [Line Items]
Individually evaluated for impairment, allowance for loan losses	38,563	28,245
Individually evaluated for impairment, recorded investment in loans	124,836	122,748
Collectively evaluated for impairment, allowance for loan losses	70,939	69,143
Collectively evaluated for impairment, allowance for loan losses	5,333,367	5,504,283
Commercial Portfolio Segment \| Hardware
Financing Receivable, Impaired [Line Items]
Individually evaluated for impairment, allowance for loan losses	2,674	9,995
Individually evaluated for impairment, recorded investment in loans	29,533	65,395
Collectively evaluated for impairment, allowance for loan losses	20,610	21,171
Collectively evaluated for impairment, allowance for loan losses	1,068,302	1,115,003
Commercial Portfolio Segment \| Private equity/venture capital
Financing Receivable, Impaired [Line Items]
Individually evaluated for impairment, allowance for loan losses	35	0
Individually evaluated for impairment, recorded investment in loans	346	0
Collectively evaluated for impairment, allowance for loan losses	57,043	50,299
Collectively evaluated for impairment, allowance for loan losses	8,426,485	7,691,148
Commercial Portfolio Segment \| Life science/healthcare
Financing Receivable, Impaired [Line Items]
Individually evaluated for impairment, allowance for loan losses	13,580	8,709
Individually evaluated for impairment, recorded investment in loans	39,293	38,361
Collectively evaluated for impairment, allowance for loan losses	17,962	16,737
Collectively evaluated for impairment, allowance for loan losses	1,696,694	1,814,643
Commercial Portfolio Segment \| Premium wine
Financing Receivable, Impaired [Line Items]
Individually evaluated for impairment, allowance for loan losses	513	520
Individually evaluated for impairment, recorded investment in loans	3,321	3,187
Collectively evaluated for impairment, allowance for loan losses	3,830	3,595
Collectively evaluated for impairment, allowance for loan losses	873,246	875,135
Commercial Portfolio Segment \| Other
Financing Receivable, Impaired [Line Items]
Individually evaluated for impairment, allowance for loan losses	342	233
Individually evaluated for impairment, recorded investment in loans	1,659	867
Collectively evaluated for impairment, allowance for loan losses	4,035	4,535
Collectively evaluated for impairment, allowance for loan losses	586,295	500,842
Commercial Portfolio Segment \| Commercial loans
Financing Receivable, Impaired [Line Items]
Individually evaluated for impairment, allowance for loan losses	55,707	47,702
Individually evaluated for impairment, recorded investment in loans	198,988	230,558
Collectively evaluated for impairment, allowance for loan losses	174,419	165,480
Collectively evaluated for impairment, allowance for loan losses	17,984,389	17,501,054
Consumer Portfolio Segment \| Consumer loans
Financing Receivable, Impaired [Line Items]
Individually evaluated for impairment, allowance for loan losses	1,074	1,123
Individually evaluated for impairment, recorded investment in loans	3,628	3,902
Collectively evaluated for impairment, allowance for loan losses	11,930	11,061
Collectively evaluated for impairment, allowance for loan losses	$ 2,240,446	$ 2,164,430

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=66008989&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=66008989&loc=SL6953423-111524

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+ 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=66008989&loc=SL6953423-111524

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