Subsequent Events (Details) (USD $) In Thousands, except Share data in Millions, unless otherwise specified	3 Months Ended		6 Months Ended		1 Months Ended				1 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Aug. 06, 2014 Fair value accounting Forecast Subsequent Event	Aug. 06, 2014 Non-marketable securities Noncontrolling Interests Fair value accounting Forecast Subsequent Event	Aug. 06, 2014 Non-marketable securities Total SVBFG Stockholders’ Equity Fair value accounting Forecast Subsequent Event	Jun. 30, 2014 FireEye Inc. Fair value accounting	Aug. 06, 2014 FireEye Inc. Fair value accounting Subsequent Event
Subsequent Event [Line Items]
Shares owned (Fund Shares)								4.9
Change in share price									24.00%
Closing stock price	$ 116.62		$ 116.62					$ 40.55	$ 30.78
Gains (losses) on investment securities, net	$ (57,320)	$ 40,561	$ 166,592	$ 67,999	$ 48,000	$ 39,000	$ 9,000