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Fair Value (Details 1) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Beginning balance $ 582us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue $ 1,474us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Total gains or losses (realized/unrealized)    
Total gains or losses (realized/unrealized) Included in earnings (realized) (329)us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInEarnings (337)us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInEarnings
Total gains or losses (realized/unrealized) Included in other comprehensive income (presented gross of taxes) 993us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss 1,099us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
Amortization 0fdef_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAmortization 0fdef_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAmortization
Sales (1,246)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
Transfers in and/or out of Level 3 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet (1,654)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet
Ending balance $ 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue $ 582us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue