Derivative Financial Instruments - Total Notional or Contractual Amounts, Fair Value, Collateral and Net Exposure of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Derivative Assets	$ 305,306	$ 284,831
Derivative Liabilities	271,486	237,479
Derivative Assets, Total	549,640	488,269
Derivative Liabilities, Total	271,486	237,479
Reduction in derivative liabilities due to rules of clearing houses	22,700	45,400
Foreign exchange forwards
Derivative [Line Items]
Derivative Assets	239,143	215,275
Derivative Liabilities	201,492	209,131
Client foreign currency options
Derivative [Line Items]
Derivative Assets	1,040	1,702
Derivative Liabilities	1,040	1,702
Client interest rate derivatives
Derivative [Line Items]
Derivative Assets	65,123	67,854
Derivative Liabilities	68,954	26,646
Derivatives designated as hedging instruments | Interest rate swaps | Other assets
Derivative [Line Items]
Derivative Asset, Notional or Contractual Amount	10,000,000	0
Derivative Assets	0	0
Derivatives designated as hedging instruments | Interest rate swaps | Other liabilities
Derivative [Line Items]
Derivative Liabilities, Notional or Contractual Amount	0	0
Derivative Liabilities	0	0
Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative Assets	549,640	488,269
Derivative Liabilities	271,486	237,479
Derivatives not designated as hedging instruments | Foreign exchange forwards | Other assets
Derivative [Line Items]
Derivative Asset, Notional or Contractual Amount	687,576	68,381
Derivative Liabilities	19,109	306
Derivatives not designated as hedging instruments | Foreign exchange forwards | Other liabilities
Derivative [Line Items]
Derivative Liabilities, Notional or Contractual Amount	97,950	566,988
Derivative Liabilities	2,626	20,566
Derivatives not designated as hedging instruments | Equity warrant assets | Other assets
Derivative [Line Items]
Derivative Asset, Notional or Contractual Amount	299,101	253,153
Derivative Assets	244,334	203,438
Derivatives not designated as hedging instruments | Client foreign exchange forwards | Other assets
Derivative [Line Items]
Derivative Asset, Notional or Contractual Amount	9,015,147	8,025,973
Derivative Assets	220,034	214,969
Derivatives not designated as hedging instruments | Client foreign exchange forwards | Other liabilities
Derivative [Line Items]
Derivative Liabilities, Notional or Contractual Amount	8,675,502	7,490,723
Derivative Liabilities	198,866	188,565
Derivatives not designated as hedging instruments | Client foreign currency options | Other assets
Derivative [Line Items]
Derivative Asset, Notional or Contractual Amount	63,503	97,529
Derivative Assets	1,040	1,702
Derivatives not designated as hedging instruments | Client foreign currency options | Other liabilities
Derivative [Line Items]
Derivative Liabilities, Notional or Contractual Amount	63,503	97,522
Derivative Liabilities	1,040	1,702
Derivatives not designated as hedging instruments | Client interest rate derivatives | Other assets
Derivative [Line Items]
Derivative Asset, Notional or Contractual Amount	1,212,842	1,082,265
Derivative Assets	65,123	67,854
Derivatives not designated as hedging instruments | Client interest rate derivatives | Other liabilities
Derivative [Line Items]
Derivative Liabilities, Notional or Contractual Amount	1,381,626	1,250,975
Derivative Liabilities	$ 68,954	$ 26,646