Noninterest Income - Summary of Other Noninterest Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Trading Activity, Gains and Losses, Net [Line Items]
Revenue from contracts with customers	$ 247,037	$ 205,905	$ 756,847	$ 644,533
Net gains on revaluation of foreign currency instruments, net of foreign exchange forward contracts	(547)	(78)	(592)	173
Gains from conversion of convertible debt options	30,018	0	30,018	0
Other service revenue	10,082	5,216	21,039	18,308
Other	49,222	13,631	76,887	42,773
Fund management fees
Trading Activity, Gains and Losses, Net [Line Items]
Revenue from contracts with customers	$ 9,669	$ 8,493	$ 26,422	$ 24,292