Derivative Financial Instruments - Total Notional or Contractual Amounts, Fair Value, Collateral and Net Exposure of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Maximum length of time over which forecasted transactions are hedged	5 years
Derivative [Line Items]
Fair Value, Derivative Assets	$ 167,341	$ 108,901
Fair Value, Derivative Liabilities	137,984	98,050
Total Derivative Assets, Fair Value	332,814	258,139
Total Derivative Liabilities, Fair Value	137,984	98,050
Interest rate swaps
Derivative [Line Items]
Fair Value, Derivative Assets	22,676
Fair Value, Derivative Liabilities	25,623
Foreign exchange forwards
Derivative [Line Items]
Fair Value, Derivative Assets	114,546	98,643
Fair Value, Derivative Liabilities	96,899	86,800
Client foreign currency options
Derivative [Line Items]
Fair Value, Derivative Assets	1,308	1,759
Fair Value, Derivative Liabilities	1,308	1,759
Client interest rate derivatives
Derivative [Line Items]
Fair Value, Derivative Assets	28,811	8,499
Fair Value, Derivative Liabilities	14,154	9,491
Derivatives designated as hedging instruments | Interest rate swaps | Other assets
Derivative [Line Items]
Derivative Assets, Notional or Contractual Amount	1,915,000	0
Fair Value, Derivative Assets	22,676	0
Derivatives designated as hedging instruments | Interest rate swaps | Other liability
Derivative [Line Items]
Derivative Liabilities, Notional or Contractual Amount	3,085,000	0
Fair Value, Derivative Liabilities	25,623	0
Derivatives not designated as hedging instruments
Derivative [Line Items]
Fair Value, Derivative Assets	310,138	258,139
Fair Value, Derivative Liabilities	112,361	98,050
Derivatives not designated as hedging instruments | Foreign exchange forwards | Other assets
Derivative [Line Items]
Derivative Assets, Notional or Contractual Amount	0	263,733
Fair Value, Derivative Assets	0	4,767
Derivatives not designated as hedging instruments | Foreign exchange forwards | Other liability
Derivative [Line Items]
Derivative Liabilities, Notional or Contractual Amount	300,250	178,310
Fair Value, Derivative Liabilities	2,154	1,094
Derivatives not designated as hedging instruments | Equity warrant assets | Other assets
Derivative [Line Items]
Derivative Assets, Notional or Contractual Amount	225,893	223,532
Fair Value, Derivative Assets	165,473	149,238
Derivatives not designated as hedging instruments | Client foreign exchange forwards | Other assets
Derivative [Line Items]
Derivative Assets, Notional or Contractual Amount	4,661,517	2,759,878
Fair Value, Derivative Assets	114,546	93,876
Derivatives not designated as hedging instruments | Client foreign exchange forwards | Other liability
Derivative [Line Items]
Derivative Liabilities, Notional or Contractual Amount	4,326,059	2,568,085
Fair Value, Derivative Liabilities	94,745	85,706
Derivatives not designated as hedging instruments | Client foreign currency options | Other assets
Derivative [Line Items]
Derivative Assets, Notional or Contractual Amount	154,985	93,556
Fair Value, Derivative Assets	1,308	1,759
Derivatives not designated as hedging instruments | Client foreign currency options | Other liability
Derivative [Line Items]
Derivative Liabilities, Notional or Contractual Amount	154,985	93,579
Fair Value, Derivative Liabilities	1,308	1,759
Derivatives not designated as hedging instruments | Client interest rate derivatives | Other assets
Derivative [Line Items]
Derivative Assets, Notional or Contractual Amount	1,275,190	1,020,416
Fair Value, Derivative Assets	28,811	8,499
Reduction in derivative assets due to rules of clearing houses		(400)
Derivatives not designated as hedging instruments | Client interest rate derivatives | Other liability
Derivative [Line Items]
Derivative Liabilities, Notional or Contractual Amount	1,372,914	1,337,328
Fair Value, Derivative Liabilities	14,154	$ 9,491
Reduction in derivative liabilities due to rules of clearing houses	$ (17,400)