Interim Consolidated Statements of Stockholders' Equity - USD ($)		Total	Cumulative adjustment for the adoption of amendment	Preferred Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	Retained Earnings Cumulative adjustment for the adoption of amendment	Accumulated Other Comprehensive Income (Loss)	Total SVBFG Stockholders’ Equity	Total SVBFG Stockholders’ Equity Cumulative adjustment for the adoption of amendment	Noncontrolling Interests
Balance (in shares) at Dec. 31, 2018					52,586,498
Balance, beginning of period, net of tax at Dec. 31, 2018		$ 5,264,843,000		$ 0	$ 53,000	$ 1,378,438,000	$ 3,791,838,000		$ (54,120,000)	$ 5,116,209,000		$ 148,634,000
Balance, beginning of period, net of tax (Accounting Standards Update 2017-08) at Dec. 31, 2018	[1]		$ (583,000)					$ (583,000)			$ (583,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Acquisition of SVB Leerink		5,256,000										5,256,000
Common stock issued under employee benefit plans, net of restricted stock cancellations (in shares)					209,743
Common stock issued under employee benefit plans, net of restricted stock cancellations		(2,936,000)			$ 0	(2,936,000)				(2,936,000)
Common stock issued under ESOP (in shares)					14,442
Common stock issued under ESOP		3,506,000				3,506,000				3,506,000
Net income (loss)		291,612,000					288,732,000			288,732,000		2,880,000
Capital calls and distributions, net		(15,720,000)										(15,720,000)
Net change in unrealized gains and losses on AFS securities, net of tax		36,411,000							36,411,000	36,411,000
Amortization of unrealized holding gains on securities transferred from AFS to HTM, net of tax		(486,000)							(486,000)	(486,000)
Foreign currency translation adjustments, net of tax		2,024,000							2,024,000	2,024,000
Net change in unrealized gains and losses on cash flow hedges, net of tax		797,000							797,000	797,000
Share-based compensation, net		15,122,000				15,122,000				15,122,000
Common stock repurchases (in shares)					(488,578)
Common stock repurchases		(116,023,000)			$ (1,000)		(116,022,000)			(116,023,000)
Balance (in shares) at Mar. 31, 2019					52,322,105
Balance, end of period, net of tax at Mar. 31, 2019		5,483,823,000		0	$ 52,000	1,394,130,000	3,963,965,000		(15,374,000)	5,342,773,000		141,050,000
Balance (in shares) at Dec. 31, 2019					51,655,607
Balance, beginning of period, net of tax at Dec. 31, 2019		6,621,080,000		340,138	$ 52,000	1,470,071,000	4,575,601,000		84,445,000	6,470,307,000		150,773,000
Balance, beginning of period, net of tax (Accounting Standards Update 2016-13) at Dec. 31, 2019	[1]		$ (35,049,000)					$ (35,049,000)			$ (35,049,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under employee benefit plans, net of restricted stock cancellations (in shares)					66,864
Common stock issued under employee benefit plans, net of restricted stock cancellations		(3,031,000)			$ 0	(3,031,000)				(3,031,000)
Common stock issued under ESOP (in shares)					12,094
Common stock issued under ESOP		2,447,000				2,447,000				2,447,000
Net income (loss)		133,649,000					135,622,000			135,622,000		(1,973,000)
Capital calls and distributions, net		(328,000)										(328,000)
Net change in unrealized gains and losses on AFS securities, net of tax		348,923,000							348,923,000	348,923,000
Amortization of unrealized holding gains on securities transferred from AFS to HTM, net of tax		(399,000)							(399,000)	(399,000)
Foreign currency translation adjustments, net of tax		(6,564,000)							(6,564,000)	(6,564,000)
Net change in unrealized gains and losses on cash flow hedges, net of tax		166,129,000							166,129,000	166,129,000
Share-based compensation, net		19,171,000				19,171,000				19,171,000
Common stock repurchases (in shares)					(244,223)
Common stock repurchases		(60,020,000)					(60,020,000)			(60,020,000)
Dividends on preferred stock		(3,369,000)					(3,369,000)			(3,369,000)
Other		582,000				582,000				582,000
Balance (in shares) at Mar. 31, 2020					51,490,342
Balance, end of period, net of tax at Mar. 31, 2020		$ 7,183,221,000		$ 340,138	$ 52,000	$ 1,489,240,000	$ 4,612,785,000		$ 592,534,000	$ 7,034,749,000		$ 148,472,000

[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.