Derivative Financial Instruments - Total Notional or Contractual Amounts, Fair Value, Collateral and Net Exposure of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Fair Value, Derivative Assets	$ 284,831	$ 167,341
Fair Value, Derivative Liabilities	237,479	137,984
Total Derivative Assets, Fair Value	488,269	332,814
Total Derivative Liabilities, Fair Value	237,479	137,984
Interest rate swaps
Derivative [Line Items]
Fair Value, Derivative Assets	0	22,676
Fair Value, Derivative Liabilities	0	25,623
Foreign exchange forwards
Derivative [Line Items]
Fair Value, Derivative Assets	215,275	114,546
Fair Value, Derivative Liabilities	209,131	96,899
Client foreign currency options
Derivative [Line Items]
Fair Value, Derivative Assets	1,702	1,308
Fair Value, Derivative Liabilities	1,702	1,308
Client interest rate derivatives
Derivative [Line Items]
Fair Value, Derivative Assets	67,854	28,811
Fair Value, Derivative Liabilities	26,646	14,154
Derivatives designated as hedging instruments | Interest rate swaps | Other assets
Derivative [Line Items]
Derivative Assets, Notional or Contractual Amount	0	1,915,000
Fair Value, Derivative Assets	0	22,676
Derivatives designated as hedging instruments | Interest rate swaps | Other liability
Derivative [Line Items]
Derivative Liabilities, Notional or Contractual Amount	0	3,085,000
Fair Value, Derivative Liabilities	0	25,623
Derivatives not designated as hedging instruments
Derivative [Line Items]
Fair Value, Derivative Assets	488,269	310,138
Fair Value, Derivative Liabilities	237,479	112,361
Derivatives not designated as hedging instruments | Foreign exchange forwards | Other assets
Derivative [Line Items]
Derivative Assets, Notional or Contractual Amount	68,381	0
Fair Value, Derivative Assets	306	0
Derivatives not designated as hedging instruments | Foreign exchange forwards | Other liability
Derivative [Line Items]
Derivative Liabilities, Notional or Contractual Amount	566,988	300,250
Fair Value, Derivative Liabilities	20,566	2,154
Derivatives not designated as hedging instruments | Equity warrant assets | Other assets
Derivative [Line Items]
Derivative Assets, Notional or Contractual Amount	253,153	225,893
Fair Value, Derivative Assets	203,438	165,473
Derivatives not designated as hedging instruments | Client foreign exchange forwards | Other assets
Derivative [Line Items]
Derivative Assets, Notional or Contractual Amount	8,025,973	4,661,517
Fair Value, Derivative Assets	214,969	114,546
Derivatives not designated as hedging instruments | Client foreign exchange forwards | Other liability
Derivative [Line Items]
Derivative Liabilities, Notional or Contractual Amount	7,490,723	4,326,059
Fair Value, Derivative Liabilities	188,565	94,745
Derivatives not designated as hedging instruments | Client foreign currency options | Other assets
Derivative [Line Items]
Derivative Assets, Notional or Contractual Amount	97,529	154,985
Fair Value, Derivative Assets	1,702	1,308
Derivatives not designated as hedging instruments | Client foreign currency options | Other liability
Derivative [Line Items]
Derivative Liabilities, Notional or Contractual Amount	97,522	154,985
Fair Value, Derivative Liabilities	1,702	1,308
Derivatives not designated as hedging instruments | Client interest rate derivatives | Other assets
Derivative [Line Items]
Derivative Assets, Notional or Contractual Amount	1,082,265	1,275,190
Fair Value, Derivative Assets	67,854	28,811
Derivatives not designated as hedging instruments | Client interest rate derivatives | Other liability
Derivative [Line Items]
Derivative Liabilities, Notional or Contractual Amount	1,250,975	1,372,914
Fair Value, Derivative Liabilities	26,646	14,154
Reduction in derivative liabilities due to rules of clearing houses	$ (45,400)	$ (17,400)