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
Common stock issued under employee benefit plans, net of restricted stock cancellations (in shares)			657,876
Common stock issued under employee benefit plans, net of restricted stock cancellations		18,898	$ 1	18,897				18,898
Common stock issued under ESOP (in shares)			27,425
Common stock issued under ESOP		3,512		3,512				3,512
Net income		374,820				343,904		343,904	30,916
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net		16,602		16,602	[1]			16,602
Capital calls and distributions, net		(65,044)							(65,044)
Net change in unrealized gains on available-for-sale securities, net of tax		(22,692)					(22,692)	(22,692)
Amortization of unrealized gains on securities transferred from available-for-sale to held-to-maturity, net of tax		(6,221)					(6,221)	(6,221)
Foreign currency translation adjustments, net of tax		1,613					1,613	1,613
Share-based compensation expense		29,671		29,671				29,671
Other, net		(225)		0		(225)		(225)
Deconsolidation of noncontrolling interest	[2]	(1,069,437)							(1,069,437)
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
Common stock issued under employee benefit plans, net of restricted stock cancellations (in shares)			600,683
Common stock issued under employee benefit plans, net of restricted stock cancellations		21,819	$ 0	21,819				21,819
Common stock issued under ESOP (in shares)			43,165
Common stock issued under ESOP		4,328		4,328				4,328
Net income		390,266				382,685		382,685	7,581
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net		(3,640)		(3,640)	[1]			(3,640)
Capital calls and distributions, net		(8,195)							(8,195)
Net change in unrealized gains on available-for-sale securities, net of tax		15,873					15,873	15,873
Amortization of unrealized gains on securities transferred from available-for-sale to held-to-maturity, net of tax		(4,652)					(4,652)	(4,652)
Foreign currency translation adjustments, net of tax		(3,195)					(3,195)	(3,195)
Share-based compensation expense		31,202		31,202				31,202
Balance (in shares) at Dec. 31, 2016			52,254,074
Balance at Dec. 31, 2016		3,777,037	$ 52	1,242,741		2,376,331	23,430	3,642,554	134,483
Common stock issued under employee benefit plans, net of restricted stock cancellations (in shares)			570,276
Common stock issued under employee benefit plans, net of restricted stock cancellations		24,909	$ 1	24,908				24,909
Common stock issued under ESOP (in shares)			10,838
Common stock issued under ESOP		2,094		2,094				2,094
Net income		519,178				490,506		490,506	28,672
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net		0		0	[1]			0
Capital calls and distributions, net		(23,535)							(23,535)
Net change in unrealized gains on available-for-sale securities, net of tax		(24,788)					(24,788)	(24,788)
Amortization of unrealized gains on securities transferred from available-for-sale to held-to-maturity, net of tax		(3,882)					(3,882)	(3,882)
Foreign currency translation adjustments, net of tax		3,768					3,768	3,768
Share-based compensation expense		44,634		44,634				44,634
Balance (in shares) at Dec. 31, 2017			52,835,188
Balance at Dec. 31, 2017		$ 4,319,415	$ 53	$ 1,314,377		$ 2,866,837	$ (1,472)	$ 4,179,795	$ 139,620

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[2] During the second quarter of 2015 we adopted new accounting guidance related to our consolidated variable interest entities (ASU 2015-02). Amounts prior to January 1, 2015 have not been revised for the adoption of this guidance. See Note 2— "Summary of Significant Accounting Policies” of the “Notes to the Consolidated Financial Statements” under Part II, Item 8 of this report for additional details.