Interim Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net income before noncontrolling interests		$ 208,026	$ 107,880
Change in foreign currency cumulative translation gains and losses:
Foreign currency translation gains		3,106	957
Related tax expense		(856)	(390)
Change in unrealized gains and losses on available-for-sale securities:
Unrealized holding losses		(58,027)	(7,757)
Related tax benefit		15,926	3,136
Reclassification adjustment for gains included in net income		0	(608)
Related tax expense		0	248
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	[1]	(40,316)	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	[1]	11,145	0
Amortization of unrealized holding gains on securities transferred from available-for-sale to held-to-maturity		(1,206)	(1,771)
Related tax benefit		333	713
Other comprehensive loss, net of tax		(70,214)	(5,472)
Comprehensive income		137,812	102,408
Comprehensive income attributable to noncontrolling interests		(13,065)	(6,397)
Comprehensive income attributable to SVBFG		124,747	96,011
Accounting Standards Update 2018-02
Change in unrealized gains and losses on available-for-sale securities:
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	[1]	$ (319)	$ 0

[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.