Interim Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income before noncontrolling interests	$ 132,516	$ 94,380	$ 240,396	$ 170,977
Change in cumulative translation gains (losses):
Foreign currency translation gains (losses)	1,578	(1,795)	2,535	(2,049)
Related tax (expense) benefit	(644)	731	(1,034)	835
Change in unrealized (losses) gains on available-for-sale securities:
Unrealized holding (losses) gains	(5,639)	40,937	(13,396)	211,768
Related tax benefit (expense)	2,500	(16,686)	5,636	(86,289)
Reclassification adjustment for losses (gains) included in net income	123	(12,328)	(485)	(11,582)
Related tax (benefit) expense	(50)	5,017	198	4,713
Amortization of unrealized gains on securities transferred from available-for-sale to held-to-maturity	(1,566)	(2,250)	(3,337)	(4,817)
Related tax benefit	630	905	1,343	1,938
Other comprehensive (loss) income, net of tax	(3,068)	14,531	(8,540)	114,517
Comprehensive income	129,448	108,911	231,856	285,494
Comprehensive (income) loss attributable to noncontrolling interests	(9,323)	(1,416)	(15,720)	1,161
Comprehensive income attributable to SVBFG	$ 120,125	$ 107,495	$ 216,136	$ 286,655