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)				142,991
Common stock issued under employee benefit plans, net of restricted stock cancellations		6,595			6,595			6,595
Common stock issued under ESOP (in shares)				27,425
Common stock issued under ESOP		3,512			3,512			3,512
Purchases of non-marketable and other securities		(9,924)
Income tax effect from stock options exercised, vesting of restricted stock and other	[1]	2,537			2,537			2,537
Deconsolidation of noncontrolling interest	[1]	(1,069,437)							(1,069,437)
Net income (loss)	[1]	102,390	[2],[3]			88,516		88,516	13,874
Capital calls and distributions, net	[1]	(40,823)							(40,823)
Net change in unrealized gains and losses on available-for-sale securities, net of tax		50,344					50,344	50,344
Amortization of unrealized gains on securities transferred from available-for-sale to held-to-maturity, net of tax		(1,689)					(1,689)	(1,689)
Foreign currency translation adjustments, net of tax	[1]	1,341					1,341	1,341
Share-based compensation expense		7,464			7,464			7,464
Balance (in shares) at Mar. 31, 2015				51,095,341
Balance at Mar. 31, 2015		3,113,968		$ 51	1,140,458	1,738,483	92,700	2,971,692	142,276
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)				47,921
Common stock issued under employee benefit plans, net of restricted stock cancellations		(250)			(250)			(250)
Common stock issued under ESOP (in shares)				43,165
Common stock issued under ESOP		4,328			4,328			4,328
Purchases of non-marketable and other securities		(12,412)
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net		(8,483)			(8,483)			(8,483)
Net income (loss)		76,597				79,174		79,174	(2,577)
Capital calls and distributions, net		(2,524)							(2,524)
Net change in unrealized gains and losses on available-for-sale securities, net of tax		101,670					101,670	101,670
Amortization of unrealized gains on securities transferred from available-for-sale to held-to-maturity, net of tax		(1,534)					(1,534)	(1,534)
Foreign currency translation adjustments, net of tax		(150)					(150)	(150)
Share-based compensation expense		8,155			8,155			8,155
Balance (in shares) at Mar. 31, 2016				51,701,312
Balance at Mar. 31, 2016		$ 3,511,040		$ 52	$ 1,192,782	$ 2,072,820	$ 115,390	$ 3,381,044	$ 129,996

[1] Amounts for the three months ended March 31, 2015, have been revised to reflect the retrospective application of new accounting guidance adopted in the second quarter of 2015 related to our consolidated variable interest entities (ASU 2015-02).

[2] Amounts for the three months ended March 31, 2015, have been revised to reflect the retrospective application of new accounting guidance adopted in the second quarter of 2015 related to our consolidated variable interest entities (ASU 2015-02).

[3] Amounts for the three months ended March 31, 2015, have been revised to reflect the retrospective application of new accounting guidance adopted in the second quarter of 2015 related to our consolidated variable interest entities (ASU 2015-02).