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Noninterest Income - Summary of Other Noninterest Income (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Trading Activity, Gains and Losses, Net [Line Items]    
Revenue from contracts with customers $ 217,257 $ 111,362
Net gains on revaluation of foreign currency instruments, net of foreign exchange forward contracts (336) (47)
Other service revenue 4,192 6,570
Other 11,897 12,259
Fund management fees    
Trading Activity, Gains and Losses, Net [Line Items]    
Revenue from contracts with customers $ 8,041 $ 5,736