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Derivative Financial Instruments - Notional Values (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Derivatives, Fair Value [Line Items] |  |
Notional values | $ 9,800,000 |
Interest rate swaps |  |
Derivatives, Fair Value [Line Items] |  |
Notional values | 9,763,509 | $ 9,926,864
Interest rate swaps | Trading |  |
Derivatives, Fair Value [Line Items] |  |
Notional values | 3,452,241 | 3,744,917
Interest rate swaps | Cash Flow Hedges | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional values | 1,117,945 | 1,150,518
Interest rate swaps | Fair Value Hedges | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional values | $ 5,193,323 | $ 5,031,429

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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 + Details
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