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Balance Sheet Restructure (Details Textual) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]                      
Available-for-sale Securities $ 239,321,000us-gaap_AvailableForSaleSecurities       $ 198,170,000us-gaap_AvailableForSaleSecurities       $ 239,321,000us-gaap_AvailableForSaleSecurities $ 198,170,000us-gaap_AvailableForSaleSecurities  
Gain (Loss) On Sale Of Securities, Net 1,000us-gaap_GainLossOnSaleOfSecuritiesNet 460,000us-gaap_GainLossOnSaleOfSecuritiesNet 471,000us-gaap_GainLossOnSaleOfSecuritiesNet 0us-gaap_GainLossOnSaleOfSecuritiesNet (337,000)us-gaap_GainLossOnSaleOfSecuritiesNet 0us-gaap_GainLossOnSaleOfSecuritiesNet 44,000us-gaap_GainLossOnSaleOfSecuritiesNet 53,000us-gaap_GainLossOnSaleOfSecuritiesNet 932,000us-gaap_GainLossOnSaleOfSecuritiesNet 97,000us-gaap_GainLossOnSaleOfSecuritiesNet 2,139,000us-gaap_GainLossOnSaleOfSecuritiesNet
Balance Sheet Restructuring [Member]                      
Restructuring Cost and Reserve [Line Items]                      
Loss On Sale Of Securities After Tax Adjustment                 260,000fdef_LossOnSaleOfSecuritiesAfterTaxAdjustment
/ us-gaap_RestructuringPlanAxis
= fdef_BalanceSheetRestructuringMember
   
Available-for-sale Securities 60,000,000us-gaap_AvailableForSaleSecurities
/ us-gaap_RestructuringPlanAxis
= fdef_BalanceSheetRestructuringMember
              60,000,000us-gaap_AvailableForSaleSecurities
/ us-gaap_RestructuringPlanAxis
= fdef_BalanceSheetRestructuringMember
   
Gain (Loss) On Sale Of Securities, Net                 1,600,000us-gaap_GainLossOnSaleOfSecuritiesNet
/ us-gaap_RestructuringPlanAxis
= fdef_BalanceSheetRestructuringMember
   
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances 62,000,000us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch
/ us-gaap_RestructuringPlanAxis
= fdef_BalanceSheetRestructuringMember
              62,000,000us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch
/ us-gaap_RestructuringPlanAxis
= fdef_BalanceSheetRestructuringMember
   
Prepaid Penalty $ 2,000,000fdef_PrepaidPenalty
/ us-gaap_RestructuringPlanAxis
= fdef_BalanceSheetRestructuringMember
              $ 2,000,000fdef_PrepaidPenalty
/ us-gaap_RestructuringPlanAxis
= fdef_BalanceSheetRestructuringMember