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Junior Subordinated Debentures Owed to Unconsolidated Subsidiary Trust (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Junior subordinated debentures owed to unconsolidated subsidiary trusts $ 36,083us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust $ 36,083us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust
First Defiance Statutory Trusts I [Member]    
Debt Instrument [Line Items]    
Junior subordinated debentures owed to unconsolidated subsidiary trusts 20,619us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust
/ fdef_JuniorSubordinatedDebenturesAxis
= fdef_FirstDefianceStatutoryTrustsIMember		 20,619us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust
/ fdef_JuniorSubordinatedDebenturesAxis
= fdef_FirstDefianceStatutoryTrustsIMember
First Defiance Statutory Trusts II [Member]    
Debt Instrument [Line Items]    
Junior subordinated debentures owed to unconsolidated subsidiary trusts $ 15,464us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust
/ fdef_JuniorSubordinatedDebenturesAxis
= fdef_FirstDefianceStatutoryTrustsIiMember		 $ 15,464us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust
/ fdef_JuniorSubordinatedDebenturesAxis
= fdef_FirstDefianceStatutoryTrustsIiMember