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Derivatives (Derivatives Not Designated as Hedging Instruments - Interest Rate Contracts) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Derivative [Line Items] |  |
Derivative assets - Fair value | $ 694,010 | $ 602,754
Derivative liabilities - Fair value | 561,788 | 424,828
Derivatives not designated as hedging instruments |  |
Derivative [Line Items] |  |
Notional Amount | 20,874,985 | 21,341,158
Derivative assets - Fair value | 693,852 | 602,754
Derivative liabilities - Fair value | 560,639 | 422,729
Derivatives not designated as hedging instruments | Interest rate contracts |  |
Derivative [Line Items] |  |
Notional Amount | 17,743,446 | 18,155,678
Derivative assets - Fair value | 298,831 | 489,132
Derivative liabilities - Fair value | 212,179 | 315,834
Derivatives not designated as hedging instruments | Financial Counterparty | Interest rate contracts |  |
Derivative [Line Items] |  |
Notional Amount | 8,890,000 | 9,090,000
Interest rate contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Written options |  |
Derivative [Line Items] |  |
Notional Amount | 1,103,453 | 957,393
Derivative assets - Fair value | 0 | 0
Derivative liabilities - Fair value | 751 | 115
Interest rate contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Sold collars and corridors |  |
Derivative [Line Items] |  |
Notional Amount | 179,605 | 518,477
Derivative assets - Fair value | 2,083 | 7,673
Derivative liabilities - Fair value | 198 | 0
Interest rate contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Swaps |  |
Derivative [Line Items] |  |
Notional Amount | 7,573,811 | 7,586,414
Derivative assets - Fair value | 276,902 | 479,634
Derivative liabilities - Fair value | 31,316 | 1,364
Interest rate contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Interest rate contracts |  |
Derivative [Line Items] |  |
Notional Amount | 8,856,869 | 9,062,284
Derivative assets - Fair value | 278,985 | 487,307
Derivative liabilities - Fair value | 32,265 | 1,479
Interest rate contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Purchased options |  |
Derivative [Line Items] |  |
Notional Amount | 1,103,453 | 957,393
Derivative assets - Fair value | 757 | 101
Derivative liabilities - Fair value | 0 | 15
Interest rate contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Collars and corridors |  |
Derivative [Line Items] |  |
Notional Amount | 179,605 | 518,477
Derivative assets - Fair value | 199 | 0
Derivative liabilities - Fair value | 2,093 | 7,717
Interest rate contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Swaps |  |
Derivative [Line Items] |  |
Notional Amount | 7,603,519 | 7,617,524
Derivative assets - Fair value | 18,890 | 1,724
Derivative liabilities - Fair value | 177,821 | 306,623
Interest rate contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Interest rate contracts |  |
Derivative [Line Items] |  |
Notional Amount | 8,886,577 | 9,093,394
Derivative assets - Fair value | 19,846 | 1,825
Derivative liabilities - Fair value | $ 179,914 | $ 314,355

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