Other Noninterest Income and Other Noninterest Expense - Summary of Other Noninterest Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Other Income and Expenses [Abstract]
Unused commitment fees	$ 3,735		$ 2,579		$ 10,582		$ 9,312
Fund management fees	2,822		2,496		8,531		8,448
Service-based fee income (1)	1,901	[1]	1,651	[1]	5,706	[1]	6,197	[1]
(Losses) gains on revaluation of foreign currency instruments	8,101	[2]	1,578	[2]	451	[2]	96	[2]
Currency revaluation (losses) gains	(32)	[3]	845	[3]	(7)	[3]	(88)	[3]
Other	4,797		2,921		11,068		8,104
Total other noninterest income	22,426		13,423		38,183		39,165
Gain on the sale of certain assets related to our equity services management business	0		0		0		4,243
Loan Syndication Fees	$ 1,102		$ 1,353		$ 1,852		$ 2,853

[1] Includes income from SVB Analytics.

[2] Represents the revaluation of foreign currency denominated financial instruments issued and held by us, primarily loans, deposits and cash.

[3] Primarily represents the revaluation of foreign currency denominated investments in certain funds. Included in these amounts are losses of $0.1 million and gains of $0.1 million for the three and nine months ended September 30, 2013, respectively, attributable to noncontrolling interests calculated based on the ownership percentages of the noncontrolling interests. This compares to gains of $0.8 million and losses of $3.0 thousand for the comparable 2012 periods.