Loans, Allowance for Loan Losses and Allowance for Unfunded Credit Commitments - Activity in Allowance for Loan Losses Broken out by Portfolio Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Reserve For Unfunded Credit Commitments	$ 46,335	$ 34,541	$ 45,265	$ 34,415
Provision for unfunded credit commitments	1,055	134
Foreign Currency Translation, Unfunded Credit Commitments	15	(8)
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	225,366	217,613
Charge-offs	(14,030)	(26,174)
Recoveries	1,792	4,813
Provision for credit losses	29,679	33,341
Foreign Currency Translation Adjustments	323	656
Ending Balance	243,130	230,249
Commercial Portfolio Segment \| Software/internet
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	97,388	103,045
Charge-offs	(7,980)	(22,161)
Recoveries	1,171	3,960
Provision for credit losses	18,719	21,632
Foreign Currency Translation Adjustments	204	422
Ending Balance	109,502	106,898
Commercial Portfolio Segment \| Hardware
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	31,166	23,085
Charge-offs	(4,024)	(1,486)
Recoveries	267	239
Provision for credit losses	(4,080)	1,959
Foreign Currency Translation Adjustments	(45)	39
Ending Balance	23,284	23,836
Commercial Portfolio Segment \| Private equity/venture capital
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	50,299	35,282
Charge-offs	0	0
Recoveries	0	0
Provision for credit losses	6,706	8,243
Foreign Currency Translation Adjustments	73	161
Ending Balance	57,078	43,686
Commercial Portfolio Segment \| Life science/healthcare
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	25,446	36,576
Charge-offs	(1,732)	(2,395)
Recoveries	36	491
Provision for credit losses	7,708	(4,303)
Foreign Currency Translation Adjustments	84	(84)
Ending Balance	31,542	30,285
Commercial Portfolio Segment \| Premium wine
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	4,115	5,205
Charge-offs	0	0
Recoveries	0	0
Provision for credit losses	226	39
Foreign Currency Translation Adjustments	2	0
Ending Balance	4,343	5,244
Commercial Portfolio Segment \| Other
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	4,768	4,252
Charge-offs	(294)	(30)
Recoveries	297	74
Provision for credit losses	(390)	5,145
Foreign Currency Translation Adjustments	(4)	106
Ending Balance	4,377	9,547
Commercial Portfolio Segment \| Commercial loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	213,182	207,445
Charge-offs	(14,030)	(26,072)
Recoveries	1,771	4,764
Provision for credit losses	28,889	32,715
Foreign Currency Translation Adjustments	314	644
Ending Balance	230,126	219,496
Consumer Portfolio Segment \| Consumer loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	12,184	10,168
Charge-offs	0	(102)
Recoveries	21	49
Provision for credit losses	790	626
Foreign Currency Translation Adjustments	9	12
Ending Balance	$ 13,004	$ 10,753

Allowance for Loan and Lease Losses, Loan Recoveries

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- Definition

Amount of gain (loss) from converting allowance reserve for unfunded credit commitments to currency of reporting entity from amount denominated or measured in a different currency which decreases (increases) the allowance for unfunded credit commitments.

+ References

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Represents the increase or decrease to the liability for probable and estimable losses associated with our reserve for unfunded credit commitments.

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Represents the reserve to cover probable and estimable future losses associated with our unfunded credit commitments as of the Balance Sheet date.

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Amount of gain (loss) from converting allowance reserve for credit loss to currency of reporting entity from amount denominated or measured in a different currency, which decreases (increases) the allowance for loan and lease losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Foreign Currency Translation
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

Amount of expense related to loss from loan transactions.

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