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Fair Value (Details 4) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Trust preferred stock, Fair Value 582us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue $ 1,474us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Impaired Loans- Applies to all loan classes, Fair Value 10,718us-gaap_ImpairedFinancingReceivableRecordedInvestment 7,791us-gaap_ImpairedFinancingReceivableRecordedInvestment  
Real estate held for sale - Applies to all classes, Fair Value 1,390us-gaap_RealEstateHeldforsale 739us-gaap_RealEstateHeldforsale  
Range of Input 2-40% [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Valuation Technique, Fair Value Discounted cash flow    
Unobservable Inputs, Fair Value Constant prepayment rate    
Fair Value, Range of Input, Minimum 2.00%fdef_FairValueMeasurementRangeOfInputMinimum
/ us-gaap_RangeAxis
= fdef_RangeOfInputTwoToFourtyPercentageMember		    
Fair Value, Range of Input, Maximum 40.00%fdef_FairValueMeasurementRangeOfInputMaximum
/ us-gaap_RangeAxis
= fdef_RangeOfInputTwoToFourtyPercentageMember		    
Fair Value Measurement Weighted Average Range 40.00%fdef_FairValueMeasurementWeightedAverageRange
/ us-gaap_RangeAxis
= fdef_RangeOfInputTwoToFourtyPercentageMember		    
Range of Input 0-30% [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable Inputs, Fair Value Expected asset default    
Fair Value, Range of Input, Minimum 0.00%fdef_FairValueMeasurementRangeOfInputMinimum
/ us-gaap_RangeAxis
= fdef_RangeOfInputZeroToThirtyPercentageMember		    
Fair Value, Range of Input, Maximum 30.00%fdef_FairValueMeasurementRangeOfInputMaximum
/ us-gaap_RangeAxis
= fdef_RangeOfInputZeroToThirtyPercentageMember		    
Fair Value Measurement Weighted Average Range 15.00%fdef_FairValueMeasurementWeightedAverageRange
/ us-gaap_RangeAxis
= fdef_RangeOfInputZeroToThirtyPercentageMember		    
Range Of Input 10-15% [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Unobservable Inputs, Fair Value Expected recoveries    
Fair Value, Range of Input, Minimum 10.00%fdef_FairValueMeasurementRangeOfInputMinimum
/ us-gaap_RangeAxis
= fdef_RangeOfInput10-15Member		    
Fair Value, Range of Input, Maximum 15.00%fdef_FairValueMeasurementRangeOfInputMaximum
/ us-gaap_RangeAxis
= fdef_RangeOfInput10-15Member		    
Fair Value Measurement Weighted Average Range 10.00%fdef_FairValueMeasurementWeightedAverageRange
/ us-gaap_RangeAxis
= fdef_RangeOfInput10-15Member		    
Range of Input 10-30% [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Valuation Technique, Fair Value Appraisals which utilize sales comparison, net income and cost approach Appraisals which utilize sales comparison, net income and cost approach  
Unobservable Inputs, Fair Value Discounts for collection issues and changes in market conditions Discounts for collection issues and changes in market conditions  
Fair Value, Range of Input, Minimum 10.00%fdef_FairValueMeasurementRangeOfInputMinimum
/ us-gaap_RangeAxis
= fdef_RangeOfInputTenToThirtyPercentageMember		 10.00%fdef_FairValueMeasurementRangeOfInputMinimum
/ us-gaap_RangeAxis
= fdef_RangeOfInputTenToThirtyPercentageMember		  
Fair Value, Range of Input, Maximum 30.00%fdef_FairValueMeasurementRangeOfInputMaximum
/ us-gaap_RangeAxis
= fdef_RangeOfInputTenToThirtyPercentageMember		 30.00%fdef_FairValueMeasurementRangeOfInputMaximum
/ us-gaap_RangeAxis
= fdef_RangeOfInputTenToThirtyPercentageMember		  
Fair Value Measurement Weighted Average Range 10.00%fdef_FairValueMeasurementWeightedAverageRange
/ us-gaap_RangeAxis
= fdef_RangeOfInputTenToThirtyPercentageMember		 11.00%fdef_FairValueMeasurementWeightedAverageRange
/ us-gaap_RangeAxis
= fdef_RangeOfInputTenToThirtyPercentageMember		  
Range of Input 20-40% [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Valuation Technique, Fair Value Appraisals which utilize sales comparison, net income and cost approach Appraisals which utilize sales comparison, net income and cost approach  
Unobservable Inputs, Fair Value Discounts for changes in market conditions Discounts for changes in market conditions  
Fair Value, Range of Input, Minimum 20.00%fdef_FairValueMeasurementRangeOfInputMinimum
/ us-gaap_RangeAxis
= fdef_RangeOfInputTwentyToFortyPercentageMember		 20.00%fdef_FairValueMeasurementRangeOfInputMinimum
/ us-gaap_RangeAxis
= fdef_RangeOfInputTwentyToFortyPercentageMember		  
Fair Value, Range of Input, Maximum 40.00%fdef_FairValueMeasurementRangeOfInputMaximum
/ us-gaap_RangeAxis
= fdef_RangeOfInputTwentyToFortyPercentageMember		 40.00%fdef_FairValueMeasurementRangeOfInputMaximum
/ us-gaap_RangeAxis
= fdef_RangeOfInputTwentyToFortyPercentageMember		  
Fair Value Measurement Weighted Average Range 26.00%fdef_FairValueMeasurementWeightedAverageRange
/ us-gaap_RangeAxis
= fdef_RangeOfInputTwentyToFortyPercentageMember		 28.00%fdef_FairValueMeasurementWeightedAverageRange
/ us-gaap_RangeAxis
= fdef_RangeOfInputTwentyToFortyPercentageMember