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Offsetting Assets and Liabilities Offsetting Assets (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Offsetting Assets [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | $ 12,064 | $ 18,488
Derivative Asset, Fair Value, Gross Liability | 0 | 0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 12,064 | 18,488
Derivative, Collateral, Obligation to Return Securities | (395) | (193)
Derivative, Collateral, Obligation to Return Cash | (7,954) | (12,141)
Derivative Asset, Fair Value, Amount Offset Against Collateral | $ 3,715 | $ 6,154

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