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Derivative Financial Instruments - Notional Values (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Derivatives, Fair Value [Line Items] |  |
Notional values | $ 6,200,000 |
Interest rate swaps |  |
Derivatives, Fair Value [Line Items] |  |
Notional values | 6,243,601 | $ 8,557,883
Interest rate swaps | Trading |  |
Derivatives, Fair Value [Line Items] |  |
Notional values | 766,726 | 2,693,364
Interest rate swaps | Cash Flow | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional values | 1,469,867 | 1,018,976
Interest rate swaps | Fair Value | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional values | $ 4,007,008 | $ 4,845,543

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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=125515794&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=125515794&loc=SL5579245-113959 + Details
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