Other Noninterest Income and Other Noninterest Expense - Summary of Other Noninterest Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Other Income and Expenses [Abstract]
Unused commitment fees	$ 3,371		$ 3,678		$ 6,847		$ 6,733
Fund management fees	2,940		3,124		5,709		5,952
Service-based fee income (1)	2,001	[1]	2,172	[1]	3,805	[1]	4,546	[1]
(Losses) gains on revaluation of foreign currency instruments	(586)	[2]	(3,367)	[2]	(7,650)	[2]	(1,482)	[2]
Currency revaluation (losses) gains	80	[3]	(1,548)	[3]	25	[3]	(933)	[3]
Other	3,674		2,987		6,271		5,183
Total other noninterest income	12,230		12,664		15,757		25,742
Gain on the sale of certain assets related to our equity services management business	0		4,243		0		4,243
Loan Syndication Fees	$ 750		$ 1,375		$ 750		$ 1,500

[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 gains of $0.3 million and $0.1 million for the three and six months ended June 30, 2013, respectively, attributable to noncontrolling interests calculated based on the ownership percentages of the noncontrolling interests. This compares to gains of $1.3 million and $0.8 million for the comparable 2012 periods.