Interim Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income before noncontrolling interests		$ 247,026	$ 132,516	$ 455,052	$ 240,396
Change in foreign currency cumulative translation gains and losses:
Foreign currency translation (losses) gains		(5,184)	1,578	(2,078)	2,535
Related tax benefit (expense)		1,433	(644)	577	(1,034)
Change in unrealized gains and losses on available-for-sale securities:
Unrealized holding losses		(15,103)	(5,639)	(73,130)	(13,396)
Related tax benefit		4,349	2,500	20,275	5,636
Reclassification adjustment for losses (gains) included in net income	[1]	0	123	0	(485)
Related tax (benefit) expense	[1]	0	(50)	0	198
Reclassification of unrealized gains on equity securities to retained earnings for ASU 2016-01	[1]	0	0	(40,316)	0
Related tax expense	[1]	0	0	11,145	0
Amortization of unrealized holding gains on securities transferred from available-for-sale to held-to-maturity		(932)	(1,566)	(2,138)	(3,337)
Related tax benefit		258	630	591	1,343
Reclassification of stranded tax effect to retained earnings for ASU 2018-02	[1]	0	0	(319)	0
Other comprehensive loss, net of tax		(15,179)	(3,068)	(85,393)	(8,540)
Comprehensive income		231,847	129,448	369,659	231,856
Comprehensive income attributable to noncontrolling interests		(9,228)	(9,323)	(22,293)	(15,720)
Comprehensive income attributable to SVBFG		$ 222,619	$ 120,125	$ 347,366	$ 216,136

[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.