Interim Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income	Total SVBFG Stockholders’ Equity	Noncontrolling Interests
Balance (in shares) at Dec. 31, 2014		50,924,925
Balance at Dec. 31, 2014	$ 4,051,734	$ 51	$ 1,120,350	$ 1,649,967	$ 42,704	$ 2,813,072	$ 1,238,662
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under employee benefit plans, net of restricted stock cancellations (in shares)		509,146
Common stock issued under employee benefit plans, net of restricted stock cancellations	13,582		13,582			13,582
Common stock issued under ESOP (in shares)		27,425
Common stock issued under ESOP	3,512		3,512			3,512
Income tax effect from stock options exercised, vesting of restricted stock and other	10,157		10,157			10,157
Deconsolidation of noncontrolling interest	(1,069,437)						(1,069,437)
Net income (loss)	196,849			174,659		174,659	22,190
Capital calls and distributions, net	(53,045)						(53,045)
Net change in unrealized gains and losses on available-for-sale securities, net of tax	22,910				22,910	22,910
Amortization of unrealized gains on securities transferred from available-for-sale to held-to-maturity, net of tax	(3,246)				(3,246)	(3,246)
Foreign currency translation adjustments, net of tax	1,549				1,549	1,549
Share-based compensation expense	14,907		14,907			14,907
Balance (in shares) at Jun. 30, 2015		51,461,496
Balance at Jun. 30, 2015	3,189,472	$ 51	1,162,508	1,824,626	63,917	3,051,102	138,370
Balance (in shares) at Dec. 31, 2015		51,610,226
Balance at Dec. 31, 2015	3,333,231	$ 52	1,189,032	1,993,646	15,404	3,198,134	135,097
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under employee benefit plans, net of restricted stock cancellations (in shares)		372,282
Common stock issued under employee benefit plans, net of restricted stock cancellations	6,852		6,852			6,852
Common stock issued under ESOP (in shares)		43,165
Common stock issued under ESOP	4,328		4,328			4,328
Income tax effect from stock options exercised, vesting of restricted stock and other	(6,587)		(6,587)			(6,587)
Net income (loss)	170,977			172,138		172,138	(1,161)
Capital calls and distributions, net	(5,721)						(5,721)
Net change in unrealized gains and losses on available-for-sale securities, net of tax	118,610				118,610	118,610
Amortization of unrealized gains on securities transferred from available-for-sale to held-to-maturity, net of tax	(2,879)				(2,879)	(2,879)
Foreign currency translation adjustments, net of tax	(1,214)				(1,214)	(1,214)
Share-based compensation expense	16,196		16,196			16,196
Balance (in shares) at Jun. 30, 2016		52,025,673
Balance at Jun. 30, 2016	$ 3,633,793	$ 52	$ 1,209,821	$ 2,165,784	$ 129,921	$ 3,505,578	$ 128,215