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Derivative Financial Instruments - Notional Values (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional Values | $ 9,900,000 |
Interest Rate Swaps |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional Values | 9,926,864 | $ 5,996,310
Interest Rate Swaps | Trading |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional Values | 3,744,917 | 1,577,978
Interest Rate Swaps | Cash Flow | Designated as Hedging Instrument |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional Values | 1,150,518 | 1,280,367
Interest Rate Swaps | Fair Value | Designated as Hedging Instrument |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional Values | $ 5,031,429 | $ 3,137,965

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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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