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, 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)	$ 0	(250)				(250)
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		(8,483)		(8,483)	[1]			(8,483)
Net income		76,597				79,174		79,174	(2,577)
Noncontrolling Interest, Period Increase (Decrease)		(2,524)							(2,524)
Net change in unrealized gains and losses on AFS securities, net of tax		101,670					101,670	101,670
Amortization of unrealized gains on securities transferred from AFS to HTM, net of tax		(1,534)					(1,534)	(1,534)
Foreign currency translation adjustments, net of tax		(150)					(150)	(150)
Share-based compensation, net		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
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]
Common stock issued under employee benefit plans, net of restricted stock cancellations (in shares)			162,797
Common stock issued under employee benefit plans, net of restricted stock cancellations		6,743	$ 0	6,743				6,743
Common stock issued under ESOP (in shares)			10,838
Common stock issued under ESOP		2,094		2,094				2,094
Income tax effect from stock options exercised, vesting of restricted stock and other	[1]			0
Net income		107,880				101,483		101,483	6,397
Noncontrolling Interest, Period Increase (Decrease)		(1,755)							(1,755)
Net change in unrealized gains and losses on AFS securities, net of tax		(4,981)					(4,981)	(4,981)
Amortization of unrealized gains on securities transferred from AFS to HTM, net of tax		(1,058)					(1,058)	(1,058)
Foreign currency translation adjustments, net of tax		567					567	567
Share-based compensation, net		16,929		16,929				16,929
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

[1] During the first quarter of 2017 we adopted ASU 2016-09, Improvements to Employee Share-Based Payment Accounting. The amendments in this ASU require that all excess tax benefits and tax deficiencies associated with share-based compensation be recognized in income tax expense or benefit in the income statement. Previously, tax effects resulting from changes in the Company's share price subsequent to grant date of share-based compensation awards were recorded through additional paid-in-capital in stockholders' equity at the time of vesting and exercise. This guidance was adopted on a prospective basis with no change to prior period amounts. See 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.