Description of interest percentage on the preferred securities.

No definition available.

Name:	fdef_CouponRateOnPreferredSecuritiesPeriodEnd
Namespace Prefix:	fdef_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

The amount of federal home loan bank advances that are yet to be called.

No definition available.

Name:	fdef_FederalHomeLoanBankAdvancesBalanceAmountYetToBeCalledSeries1
Namespace Prefix:	fdef_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Enter the last year of maturity for the advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date.

No definition available.

Name:	fdef_FederalHomeLoanBankAdvancesBranchOfFhlbBankLastDueDate
Namespace Prefix:	fdef_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The interest of federal home loan bank advances that are yet to be called.

No definition available.

Name:	fdef_FederalHomeLoanBankAdvancesinterestRateOnBalanceAmountYetToBeCalledSeries1
Namespace Prefix:	fdef_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Issuance of subordinated debenture as on reporting date.

No definition available.

Name:	fdef_IssuanceOfSubordinatedDebentures
Namespace Prefix:	fdef_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Issuance of preferred stock as on reporting date.

No definition available.

Name:	fdef_IssuanceOfTrustPreferredSecurities
Namespace Prefix:	fdef_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Description of variable interest percentage for the preferred securities. (e.g. Libor plus variable interest rate)

No definition available.

Name:	fdef_PreferredSecuritiesVariableInterestRate
Namespace Prefix:	fdef_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=fdef_PutableAdvancesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=fdef_TrustAffiliateIMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=fdef_TrustAffiliateIiMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=fdef_StrikeRateAdvancesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Borrowings (Details Textual) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
Borrowings (Details Textual) - USD ($) $ in Millions	Mar. 31, 2007	Jun. 30, 2015	Dec. 31, 2005	Dec. 31, 2014
Putable Advances [Member]
Federal Home Loan Bank Advances Balance Amount Yet To Be Called Series1		$ 5.0
Federal home Loan Bank Advances Interest Rate On Balance Amount Yet To Be Called Series1		2.35%
Trust Affiliate I [Member]
Issuance Of Trust Preferred Securities			$ 20.0
Issuance Of Subordinated Debentures			$ 20.6
Coupon Rate On Preferred Securities, Period End		1.66%		1.62%
Preferred Securities Variable Interest Rate			LIBOR rate plus 1.38%
Trust Affiliate II [Member]
Issuance Of Trust Preferred Securities	$ 15.0
Issuance Of Subordinated Debentures	$ 15.5
Coupon Rate On Preferred Securities, Period End		1.78%		1.74%
Preferred Securities Variable Interest Rate	LIBOR rate plus 1.5%
Trust Affiliate II [Member] \| Strike Rate Advances [Member]
Federal Home Loan Bank Advances Branch of Fhlb Bank Last Due Date		March 12, 2018