Interim Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income before noncontrolling interests	$ 474,055	$ 281,718	$ 855,493	$ 909,901
Change in foreign currency cumulative translation gains and losses:
Foreign currency translation gains (losses)	10,279	(6,213)	1,323	(6,307)
Related tax (expense) benefit	(2,804)	1,731	(452)	1,757
Change in unrealized gains and losses on available-for-sale securities:
Unrealized holding gains	13,860	70,185	604,479	236,203
Related tax expense	(3,842)	(19,547)	(167,542)	(65,786)
Reclassification adjustment for losses (gains) included in net income	0	0	(61,165)	3,905
Related tax (benefit) expense	0	0	16,953	(1,087)
Amortization of unrealized holding gains on securities transferred from available-for-sale to held-to-maturity	(368)	(374)	(1,058)	(1,767)
Related tax benefit	102	104	293	492
Change in unrealized gains and losses on cash flow hedges:
Unrealized gains	0	9,810	231,920	28,466
Related tax expense	0	(2,733)	(64,281)	(7,930)
Reclassification adjustment for (gains) losses included in net income	(16,004)	2,713	(33,924)	3,224
Related tax expense (benefit)	4,436	(755)	9,403	(897)
Other comprehensive income, net of tax	5,659	54,921	535,949	190,273
Comprehensive income	479,714	336,639	1,391,442	1,100,174
Comprehensive income attributable to noncontrolling interests	(27,748)	(14,437)	(40,035)	(35,901)
Comprehensive income attributable to SVBFG	$ 451,966	$ 322,202	$ 1,351,407	$ 1,064,273