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Derivative Financial Instruments - Notional Values (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Derivatives, Fair Value [Line Items] |  |
Notional values | $ 7,200,000 |
Interest rate swaps |  |
Derivatives, Fair Value [Line Items] |  |
Notional values | 7,201,245 | $ 5,459,075
Interest rate swaps | Trading |  |
Derivatives, Fair Value [Line Items] |  |
Notional values | 1,577,978 | 987,577
Interest rate swaps | Cash Flow Hedges | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional values | 1,312,573 | 1,408,649
Interest rate swaps | Fair Value Hedges | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional values | $ 4,310,694 | $ 3,062,849

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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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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