Loans and Allowance for Loan Losses - Allowance for Loan Losses Individually and Collectively Evaluated for Impairment (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Individually Evaluated for Impairment	$ 57,773	$ 15,051
Financing Receivable, Individually Evaluated for Impairment	182,684	38,137
Collectively Evaluated for Impairment	159,840	150,308
Financing Receivable, Collectively Evaluated for Impairment	16,559,386	14,346,139
Commercial loans
Financing Receivable, Impaired [Line Items]
Individually Evaluated for Impairment	57,630	15,020
Financing Receivable, Individually Evaluated for Impairment	182,541	37,820
Collectively Evaluated for Impairment	149,815	142,752
Financing Receivable, Collectively Evaluated for Impairment	14,788,206	13,067,821
Commercial loans \| Software and internet
Financing Receivable, Impaired [Line Items]
Individually Evaluated for Impairment	34,098	13,695
Financing Receivable, Individually Evaluated for Impairment	100,866	33,287
Collectively Evaluated for Impairment	68,947	67,286
Financing Receivable, Collectively Evaluated for Impairment	5,337,049	4,921,389
Commercial loans \| Hardware
Financing Receivable, Impaired [Line Items]
Individually Evaluated for Impairment	3,160	1,133
Financing Receivable, Individually Evaluated for Impairment	27,736	2,521
Collectively Evaluated for Impairment	19,925	24,727
Financing Receivable, Collectively Evaluated for Impairment	1,043,792	1,128,485
Commercial loans \| Private equity/venture capital
Financing Receivable, Impaired [Line Items]
Individually Evaluated for Impairment	0	0
Financing Receivable, Individually Evaluated for Impairment	0	0
Collectively Evaluated for Impairment	35,282	27,997
Financing Receivable, Collectively Evaluated for Impairment	5,467,577	4,582,906
Commercial loans \| Life science/healthcare
Financing Receivable, Impaired [Line Items]
Individually Evaluated for Impairment	20,230	121
Financing Receivable, Individually Evaluated for Impairment	51,354	475
Collectively Evaluated for Impairment	16,346	15,087
Financing Receivable, Collectively Evaluated for Impairment	1,659,288	1,289,429
Commercial loans \| Premium wine
Financing Receivable, Impaired [Line Items]
Individually Evaluated for Impairment	90	0
Financing Receivable, Individually Evaluated for Impairment	2,065	1,304
Collectively Evaluated for Impairment	5,115	4,473
Financing Receivable, Collectively Evaluated for Impairment	845,230	793,017
Commercial loans \| Other
Financing Receivable, Impaired [Line Items]
Individually Evaluated for Impairment	52	71
Financing Receivable, Individually Evaluated for Impairment	520	233
Collectively Evaluated for Impairment	4,200	3,182
Financing Receivable, Collectively Evaluated for Impairment	435,270	352,595
Consumer loans
Financing Receivable, Impaired [Line Items]
Individually Evaluated for Impairment	143	31
Financing Receivable, Individually Evaluated for Impairment	143	317
Collectively Evaluated for Impairment	10,025	7,556
Financing Receivable, Collectively Evaluated for Impairment	$ 1,771,180	$ 1,278,318

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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+ 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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