Loans and Allowance for Loan Losses - Activity in Allowance for Loan Losses Broken out by Portfolio Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	$ 217,613	$ 165,359
Charge-offs	(26,174)	(5,487)
Recoveries	5,469	1,551
Provision for loan losses	33,341	6,452
Ending Balance	230,249	167,875
Commercial Portfolio Segment \| Software and internet
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	103,045	80,981
Charge-offs	(22,161)	(1,403)
Recoveries	3,960	447
Provision for loan losses	22,054	2,067
Ending Balance	106,898	82,092
Commercial Portfolio Segment \| Hardware
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	23,085	25,860
Charge-offs	(1,486)	(3,210)
Recoveries	239	928
Provision for loan losses	1,998	(2,320)
Ending Balance	23,836	21,258
Commercial Portfolio Segment \| Private equity/venture capital
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	35,282	27,997
Charge-offs	0	0
Recoveries	0	0
Provision for loan losses	8,404	2,840
Ending Balance	43,686	30,837
Commercial Portfolio Segment \| Life science/healthcare
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	36,576	15,208
Charge-offs	(2,395)	(225)
Recoveries	491	34
Provision for loan losses	(4,387)	306
Ending Balance	30,285	15,323
Commercial Portfolio Segment \| Premium wine
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	5,205	4,473
Charge-offs	0	0
Recoveries	0	0
Provision for loan losses	39	30
Ending Balance	5,244	4,503
Commercial Portfolio Segment \| Other
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	4,252	3,253
Charge-offs	(30)	(649)
Recoveries	730	10
Provision for loan losses	4,595	3,537
Ending Balance	9,547	6,151
Commercial Portfolio Segment \| Commercial loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	207,445	157,772
Charge-offs	(26,072)	(5,487)
Recoveries	5,420	1,419
Provision for loan losses	32,703	6,460
Ending Balance	219,496	160,164
Consumer Portfolio Segment \| Consumer loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	10,168	7,587
Charge-offs	(102)	0
Recoveries	49	132
Provision for loan losses	638	(8)
Ending Balance	$ 10,753	$ 7,711

Allowance for Loan and Lease Losses, Loan Recoveries

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ 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 (g)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(d))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (b)(1)(ii)
-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section L
-Subsection 1

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- Definition

Amount of expense related to loss from loan transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.11)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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