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Derivative Financial Instruments Offsetting of Derivative Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities Presented in the Consolidated Balance Sheets $ 1,723us-gaap_DerivativeFairValueOfDerivativeLiability $ 1,553us-gaap_DerivativeFairValueOfDerivativeLiability
Derivative Liability, Fair Value, Amount Not Offset Against Collateral (267)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral (182)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
Cash Collateral Pledged Not Offset in the Consolidated Balance Sheets 0us-gaap_DerivativeCollateralRightToReclaimCash 0us-gaap_DerivativeCollateralRightToReclaimCash
Derivative Liability, Fair Value, Amount Offset Against Collateral $ 1,456us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral $ 1,371us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral