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Derivatives (Derivatives Not Designated as Hedging Instruments - Foreign Exchange Contracts) (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Derivative [Line Items] |  |
Derivative assets - Fair value | $ 834,204 | $ 330,316
Derivative liabilities - Fair value | 658,515 | 256,528
Derivatives not designated as hedging instruments |  |
Derivative [Line Items] |  |
Notional amount | 21,826,497 | 20,540,031
Derivative assets - Fair value | 834,131 | 330,316
Derivative liabilities - Fair value | 657,340 | 251,744
Derivatives not designated as hedging instruments | Foreign exchange contracts |  |
Derivative [Line Items] |  |
Notional amount | 4,958,834 | 4,839,661
Derivative assets - Fair value | 64,310 | 54,637
Derivative liabilities - Fair value | 55,627 | 47,024
Foreign exchange contracts | Customer Counterparty | Derivatives not designated as hedging instruments | Forwards and spot |  |
Derivative [Line Items] |  |
Notional amount | 3,658,965 | 3,581,036
Derivative assets - Fair value | 50,674 | 45,911
Derivative liabilities - Fair value | 38,564 | 40,591
Foreign exchange contracts | Customer Counterparty | Derivatives not designated as hedging instruments | Swaps |  |
Derivative [Line Items] |  |
Notional amount | 9,007 | 6,889
Derivative assets - Fair value | 4 | 16
Derivative liabilities - Fair value | 95 | 84
Foreign exchange contracts | Customer Counterparty | Derivatives not designated as hedging instruments | Written options |  |
Derivative [Line Items] |  |
Notional amount | 86,810 | 87,036
Derivative assets - Fair value | 217 | 127
Derivative liabilities - Fair value | 0 | 0
Foreign exchange contracts | Customer Counterparty | Derivatives not designated as hedging instruments | Collars |  |
Derivative [Line Items] |  |
Notional amount | 2,205 | 2,244
Derivative assets - Fair value | 27 | 0
Derivative liabilities - Fair value | 0 | 14
Foreign exchange contracts | Customer Counterparty | Derivatives not designated as hedging instruments | Foreign exchange contracts |  |
Derivative [Line Items] |  |
Notional amount | 3,756,987 | 3,677,205
Derivative assets - Fair value | 50,922 | 46,054
Derivative liabilities - Fair value | 38,659 | 40,689
Foreign exchange contracts | Financial Counterparty | Derivatives not designated as hedging instruments | Forwards and spot |  |
Derivative [Line Items] |  |
Notional amount | 176,903 | 207,492
Derivative assets - Fair value | 4,049 | 1,400
Derivative liabilities - Fair value | 7,721 | 507
Foreign exchange contracts | Financial Counterparty | Derivatives not designated as hedging instruments | Swaps |  |
Derivative [Line Items] |  |
Notional amount | 773,059 | 702,391
Derivative assets - Fair value | 7,569 | 6,156
Derivative liabilities - Fair value | 7,256 | 4,712
Foreign exchange contracts | Financial Counterparty | Derivatives not designated as hedging instruments | Purchased options |  |
Derivative [Line Items] |  |
Notional amount | 86,810 | 87,036
Derivative assets - Fair value | 0 | 0
Derivative liabilities - Fair value | 217 | 127
Foreign exchange contracts | Financial Counterparty | Derivatives not designated as hedging instruments | Collars |  |
Derivative [Line Items] |  |
Notional amount | 165,075 | 165,537
Derivative assets - Fair value | 1,770 | 1,027
Derivative liabilities - Fair value | 1,774 | 989
Foreign exchange contracts | Financial Counterparty | Derivatives not designated as hedging instruments | Foreign exchange contracts |  |
Derivative [Line Items] |  |
Notional amount | 1,201,847 | 1,162,456
Derivative assets - Fair value | 13,388 | 8,583
Derivative liabilities - Fair value | $ 16,968 | $ 6,335

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