Derivative Financial Instruments - Total Notional or Contractual Amounts, Fair Value, Collateral and Net Exposure of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Fair Value, Derivative Assets	$ 108,901	$ 108,389
Fair Value, Derivative Liabilities	98,050	108,581
Variation Margin	400
Variation Margin - Notional Amount	212,300
Foreign exchange forwards
Derivative [Line Items]
Fair Value, Derivative Assets	98,643	95,449
Fair Value, Derivative Liabilities	86,800	95,454
Client foreign currency options
Derivative [Line Items]
Fair Value, Derivative Assets	1,759	1,187
Fair Value, Derivative Liabilities	1,759	1,187
Client interest rate derivatives
Derivative [Line Items]
Fair Value, Derivative Assets	8,499	11,753
Fair Value, Derivative Liabilities	9,491	11,940
Derivatives not designated as hedging instruments
Derivative [Line Items]
Fair Value, Derivative Assets	258,139	232,152
Fair Value, Derivative Liabilities	98,050	108,581
Derivatives not designated as hedging instruments | Foreign exchange forwards | Other assets
Derivative [Line Items]
Derivative Assets, Notional or Contractual Amount	263,733	50,889
Fair Value, Derivative Assets	4,767	414
Derivatives not designated as hedging instruments | Foreign exchange forwards | Other liability
Derivative [Line Items]
Derivative Liabilities, Notional or Contractual Amount	178,310	425,055
Fair Value, Derivative Liabilities	1,094	5,201
Derivatives not designated as hedging instruments | Equity warrant assets | Other assets
Derivative [Line Items]
Derivative Assets, Notional or Contractual Amount	223,532	211,253
Fair Value, Derivative Assets	149,238	123,763
Derivatives not designated as hedging instruments | Client foreign exchange forwards | Other assets
Derivative [Line Items]
Derivative Assets, Notional or Contractual Amount	2,759,878	2,203,643
Fair Value, Derivative Assets	93,876	95,035
Derivatives not designated as hedging instruments | Client foreign exchange forwards | Other liability
Derivative [Line Items]
Derivative Liabilities, Notional or Contractual Amount	2,568,085	2,092,207
Fair Value, Derivative Liabilities	85,706	90,253
Derivatives not designated as hedging instruments | Client foreign currency options | Other assets
Derivative [Line Items]
Derivative Assets, Notional or Contractual Amount	93,556	102,678
Fair Value, Derivative Assets	1,759	1,187
Derivatives not designated as hedging instruments | Client foreign currency options | Other liability
Derivative [Line Items]
Derivative Liabilities, Notional or Contractual Amount	93,579	102,678
Fair Value, Derivative Liabilities	1,759	1,187
Derivatives not designated as hedging instruments | Client interest rate derivatives | Other assets
Derivative [Line Items]
Derivative Assets, Notional or Contractual Amount	1,020,416	726,984
Fair Value, Derivative Assets	8,499	11,753
Derivatives not designated as hedging instruments | Client interest rate derivatives | Other liability
Derivative [Line Items]
Derivative Liabilities, Notional or Contractual Amount	1,337,328	782,586
Fair Value, Derivative Liabilities	$ 9,491	$ 11,940