Noninterest Income - Summary of Other Noninterest Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Trading Activity, Gains and Losses, Net [Line Items]
Revenue from contracts with customers	$ 285,382	$ 221,371	$ 507,822	$ 438,628
Net gains on revaluation of foreign currency instruments, net of foreign exchange forward contracts	199	587	(45)	251
Other service revenue	7,484	8,900	10,957	13,092
Other	16,528	17,245	27,665	29,142
Fund management fees
Trading Activity, Gains and Losses, Net [Line Items]
Revenue from contracts with customers	$ 8,845	$ 7,758	$ 16,753	$ 15,799