Interim Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income before noncontrolling interests	$ 133,649	$ 291,612
Change in foreign currency cumulative translation gains and losses:
Foreign currency translation (losses) gains	(9,120)	2,806
Related tax benefit (expense)	2,556	(782)
Change in unrealized gains and losses on available-for-sale securities:
Unrealized holding gains	543,881	46,836
Related tax expense	(150,746)	(13,045)
Reclassification adjustment for (gains) losses included in net income	(61,165)	3,630
Related tax expense (benefit)	16,953	(1,010)
Amortization of unrealized holding gains on securities transferred from available-for-sale to held-to-maturity	(552)	(674)
Related tax benefit	153	188
Change in unrealized gains and losses on cash flow hedges:
Unrealized gains	231,920	1,102
Related tax expense	(64,281)	(307)
Reclassification adjustment for (gains) losses included in net income	(2,089)	3
Related tax expense (benefit)	579	(1)
Other comprehensive income, net of tax	508,089	38,746
Comprehensive income	641,738	330,358
Comprehensive loss (income) attributable to noncontrolling interests	1,973	(2,880)
Comprehensive income attributable to SVBFG	$ 643,711	$ 327,478

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