Interim Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Total SVBFG Stockholders’ Equity	Noncontrolling Interests
Balance at Dec. 31, 2012	$ 2,605,233	$ 45	$ 547,079	$ 1,174,878	$ 108,553	$ 1,830,555	$ 774,678
Balance (in shares) at Dec. 31, 2012		44,627,182
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under employee benefit plans, net of restricted stock cancellations (in shares)		758,415
Common stock issued under employee benefit plans, net of restricted stock cancellations	27,120	0	27,120			27,120
Common stock issued under ESOP (in shares)		74,946
Common stock issued under ESOP	5,166	0	5,166			5,166
Income tax benefit from stock options exercised, vesting of restricted stock and other	1,515		1,515			1,515
Net income	137,033			89,475		89,475	47,558
Capital calls, net	1,903						1,903
Net change in unrealized gains and losses on available-for-sale securities, net of tax	(115,431)				(115,431)	(115,431)
Foreign currency translation adjustments, net of tax	(2,893)				(2,893)	(2,893)
Share-based compensation expense	12,445		12,445			12,445
Other, net	4		3	1		4
Balance at Jun. 30, 2013	2,672,095	45	593,328	1,264,354	(9,771)	1,847,956	824,139
Balance (in shares) at Jun. 30, 2013		45,460,543
Balance at Dec. 31, 2013	3,079,328	46	624,256	1,390,732	(48,764)	1,966,270	1,113,058
Balance (in shares) at Dec. 31, 2013		45,800,418
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under employee benefit plans, net of restricted stock cancellations (in shares)		379,026
Common stock issued under employee benefit plans, net of restricted stock cancellations	8,127	0	8,127			8,127
Common stock issued under ESOP (in shares)		30,762
Common stock issued under ESOP	3,890	0	3,890			3,890
Income tax benefit from stock options exercised, vesting of restricted stock and other	6,164		6,164			6,164
Net income	284,906			142,098		142,098	142,808
Capital calls, net	6,419						6,419
Net change in unrealized gains and losses on available-for-sale securities, net of tax	76,176				76,176	76,176
Cumulative-effect for unrealized gains on securities transferred from available-for-sale to held-to-maturity, net of tax	22,522				22,522	22,522
Amortization of unrealized gains on securities transferred from available-for-sale to held-to-maturity, net of tax	(625)				(625)	(625)
Foreign currency translation adjustments, net of tax	967				967	967
Common stock issued in public offering (shares)		4,485,000
Common stock issued in public offering	434,866	5	434,861			434,866
Share-based compensation expense	15,284		15,284			15,284
Balance at Jun. 30, 2014	$ 3,938,024	$ 51	$ 1,092,582	$ 1,532,830	$ 50,276	$ 2,675,739	$ 1,262,285
Balance (in shares) at Jun. 30, 2014		50,695,206