Interim Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands		Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Total SVBFG Stockholders’ Equity	Noncontrolling Interests	Accounting Standards Update 2014-09	Accounting Standards Update 2014-09 Retained Earnings	Accounting Standards Update 2014-09 Total SVBFG Stockholders’ Equity	Accounting Standards Update 2016-01	Accounting Standards Update 2016-01 Retained Earnings	Accounting Standards Update 2016-01 Accumulated Other Comprehensive Income (Loss)	Accounting Standards Update 2016-01 Total SVBFG Stockholders’ Equity	Accounting Standards Update 2018-02		Accounting Standards Update 2018-02 Retained Earnings	[2]	Accounting Standards Update 2018-02 Accumulated Other Comprehensive Income (Loss)	[2]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	[1]															$ 0
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		107,880
Balance (in shares) at Mar. 31, 2017			52,427,709
Balance at Mar. 31, 2017		3,903,456	$ 52	1,268,507	2,477,814	17,958	3,764,331	139,125
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification																$ (319)	[1]	$ 319		$ (319)
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under employee benefit plans, net of restricted stock cancellations (in shares)			77,359
Common stock issued under employee benefit plans, net of restricted stock cancellations		(479)	$ 0	(479)			(479)
Common stock issued under ESOP (in shares)			9,672
Common stock issued under ESOP		2,577		2,577			2,577
Net income		208,026			194,961		194,961	13,065
Noncontrolling Interest, Period Increase (Decrease)		(8,407)						(8,407)
Net change in unrealized gains and losses on AFS securities, net of tax		(42,101)				(42,101)	(42,101)
Amortization of unrealized holding gains on securities transferred from AFS to HTM, net of tax		(873)				(873)	(873)
Foreign currency translation adjustments, net of tax		2,250				2,250	2,250
Share-based compensation, net		10,523		10,523			10,523
Balance (in shares) at Mar. 31, 2018			52,922,219
Balance at Mar. 31, 2018		$ 4,559,724	$ 53	$ 1,326,998	$ 3,160,081	$ (71,686)	$ 4,415,446	$ 144,278
Cumulative Effect of New Accounting Principle in Period of Adoption	[2]								$ (5,802)	$ (5,802)	$ (5,802)	$ 74,595	$ 103,766	$ (29,171)	$ 74,595

[1] See "Adoption of New Accounting Standards" in Note 1—“Basis of Presentation” of the “Notes to Interim Consolidated Financial Statements (unaudited)” under Part I, Item 1 of this report for additional details.

[2] See "Adoption of New Accounting Standards" in Note 1—“Basis of Presentation” of the “Notes to Interim Consolidated Financial Statements (unaudited)” under Part I, Item 1 of this report for additional details.