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Junior Subordinated Debentures Owed to Unconsolidated Subsidiary Trust (Details Textual) (USD $)
In Millions, unless otherwise specified
1 Months Ended 12 Months Ended
Mar. 27, 2007
Dec. 31, 2014
Dec. 31, 2013
First Defiance Statutory Trusts I [Member]      
Debt Instrument [Line Items]      
Proceeds from Issuance of Trust Preferred Securities   $ 20us-gaap_ProceedsFromIssuanceOfTrustPreferredSecurities
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= fdef_FirstDefianceStatutoryTrustsIMember
 
Proceeds from Issuance of Subordinated Long-term Debt   20.6us-gaap_ProceedsFromIssuanceOfSubordinatedLongTermDebt
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= fdef_FirstDefianceStatutoryTrustsIMember
 
Preferred Securities Variable Interest Rate LIBOR rate plus 1.38%    
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Description   The Trust Preferred Securities andSubordinated Debentures mature onDecember 15, 2035, butcan be redeemedat the Companys option atany time now.  
Coupon Rate On Preferred Securities, Period End   1.62%fdef_CouponRateOnPreferredSecuritiesPeriodEnd
/ fdef_JuniorSubordinatedDebenturesAxis
= fdef_FirstDefianceStatutoryTrustsIMember
1.63%fdef_CouponRateOnPreferredSecuritiesPeriodEnd
/ fdef_JuniorSubordinatedDebenturesAxis
= fdef_FirstDefianceStatutoryTrustsIMember
First Defiance Statutory Trusts II [Member]      
Debt Instrument [Line Items]      
Proceeds from Issuance of Trust Preferred Securities 15us-gaap_ProceedsFromIssuanceOfTrustPreferredSecurities
/ fdef_JuniorSubordinatedDebenturesAxis
= fdef_FirstDefianceStatutoryTrustsIiMember
   
Proceeds from Issuance of Subordinated Long-term Debt 15.5us-gaap_ProceedsFromIssuanceOfSubordinatedLongTermDebt
/ fdef_JuniorSubordinatedDebenturesAxis
= fdef_FirstDefianceStatutoryTrustsIiMember
   
Preferred Securities Variable Interest Rate LIBOR rate plus 1.5%    
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Description   The Trust Preferred Securities and Subordinated Debentures mature on June 15, 2037, butcan be redeemed at the Companys option at any time now.  
Coupon Rate On Preferred Securities, Period End   1.74%fdef_CouponRateOnPreferredSecuritiesPeriodEnd
/ fdef_JuniorSubordinatedDebenturesAxis
= fdef_FirstDefianceStatutoryTrustsIiMember
1.75%fdef_CouponRateOnPreferredSecuritiesPeriodEnd
/ fdef_JuniorSubordinatedDebenturesAxis
= fdef_FirstDefianceStatutoryTrustsIiMember