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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effective of adopting ASU 2014-01 | Accounting Standards Update 2014-01	[1]	$ (4,635)				$ (4,635)		$ (4,635)
Balance (in shares) (Previously Reported) at Dec. 31, 2013				45,800,418
Balance (in shares) at Dec. 31, 2013				45,800,418
Balance (Previously Reported) at Dec. 31, 2013		3,079,328		$ 46	$ 624,256	1,390,732	$ (48,764)	1,966,270	$ 1,113,058
Balance at Dec. 31, 2013		3,074,693		$ 46	624,256	1,386,097	(48,764)	1,961,635	1,113,058
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under employee benefit plans, net of restricted stock cancellations (in shares)				504,766
Common stock issued under employee benefit plans, net of restricted stock cancellations		13,878		$ 0	13,878			13,878
Common stock issued under ESOP (in shares)				30,762
Common stock issued under ESOP		3,890			3,890			3,890
Income tax benefit from stock options exercised, vesting of restricted stock and other		7,973			7,973			7,973
Net income	[1]	348,865	[2],[3],[4],[5]			205,880		205,880	142,985
Capital calls and distributions, net		(37,984)							(37,984)
Net change in unrealized gains and losses on available-for-sale securities, net of tax		47,758					47,758	47,758
Held-to-maturity securities, transferred securities, unrealized gains, net of tax		22,522					22,522	22,522
Amortization of unrealized gains on securities transferred from available-for-sale to held-to-maturity, net of tax		(2,415)					(2,415)	(2,415)
Foreign currency translation adjustments, net of tax		(357)					(357)	(357)
Common stock issued in public offering (in shares)				4,485,000
Common stock issued in public offering		434,866		$ 5	434,861	0		434,866
Share-based compensation expense		22,479			22,479			22,479
Balance (in shares) at Sep. 30, 2014	[1]			50,820,946
Balance at Sep. 30, 2014	[1]	3,936,168		$ 51	1,107,337	1,591,977	18,744	2,718,109	1,218,059
Balance (in shares) at Dec. 31, 2014	[1]			50,924,925
Balance at Dec. 31, 2014	[1]	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)				536,635
Common stock issued under employee benefit plans, net of restricted stock cancellations		14,712			14,712			14,712
Common stock issued under ESOP (in shares)				27,425
Common stock issued under ESOP		3,512			3,512			3,512
Income tax benefit from stock options exercised, vesting of restricted stock and other		10,813			10,813			10,813
Deconsolidation of noncontrolling interest		(1,069,437)							(1,069,437)
Net income		284,811	[2],[3],[4],[5],[6]			256,392		256,392	28,419
Capital calls and distributions, net		(58,315)							(58,315)
Net change in unrealized gains and losses on available-for-sale securities, net of tax		57,605					57,605	57,605
Amortization of unrealized gains on securities transferred from available-for-sale to held-to-maturity, net of tax		(4,779)					(4,779)	(4,779)
Foreign currency translation adjustments, net of tax		1,534					1,534	1,534
Share-based compensation expense		22,262			22,262			22,262
Other, net		(224)			0	(224)		(224)
Balance (in shares) at Sep. 30, 2015				51,488,985
Balance at Sep. 30, 2015		$ 3,314,228		$ 51	$ 1,171,649	$ 1,906,135	$ 97,064	$ 3,174,899	$ 139,329

[1] Prior period amounts have been revised to reflect the retrospective application of new accounting guidance adopted in the first quarter of 2015 related to our investments in qualified affordable housing projects (ASU 2014-01). See Note 1— "Basis of Presentation" of the "Notes to Interim Consolidated Financial Statements" under Part I, Item 1 in this report.

[2] Amounts for the nine months ended September 30, 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). Amounts prior to January 1, 2015 have not been revised for the adoption of this guidance. 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.

[3] Cash flows for the nine months ended September 30, 2015 were revised to reflect the adoption of ASU 2015-02 as of January 1, 2015 and cash flows for the nine months ended September 30, 2014 were revised to reflect the retrospective application of our adoption of ASU 2014-01.

[4] Prior period amounts have been revised to reflect the retrospective application of new accounting guidance adopted in the first quarter of 2015 related to our investments in qualified affordable housing projects (ASU 2014-01). See Note 1— "Basis of Presentation" of the "Notes to Interim Consolidated Financial Statements" under Part I, Item 1 in this report.

[5] Prior period amounts have been revised to reflect the retrospective application of new accounting guidance adopted in the first quarter of 2015 related to our investments in qualified affordable housing projects (ASU 2014-01). See Note 1— "Basis of Presentation" of the "Notes to Interim Consolidated Financial Statements" under Part I, Item 1 in this report.

[6] Amounts for the nine months ended September 30, 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). Amounts prior to January 1, 2015 have not been revised for the adoption of this guidance. 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.