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Derivative Financial Instruments - Notional Values (Details) - Interest rate swaps - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Notional values | $ 6,130,763 | $ 5,495,857
Trading |  |
Derivatives, Fair Value [Line Items] |  |
Notional values | 1,215,900 | 1,305,757
Cash Flow Hedges | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional values | 1,106,847 | 1,109,933
Fair Value Hedges | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional values | $ 3,808,016 | $ 3,080,167

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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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