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Derivative Financial Instruments - Notional Values (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional Values | $ 5,500,000 |
Interest Rate Swaps |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional Values | 5,459,075 | $ 5,177,388
Interest Rate Swaps | Trading |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional Values | 987,577 | 494,638
Interest Rate Swaps | Cash Flow | Designated as Hedging Instrument |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional Values | 1,408,649 | 1,054,688
Interest Rate Swaps | Fair Value | Designated as Hedging Instrument |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional Values | $ 3,062,849 | $ 3,628,062

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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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