This element represents percentage of discount in appraisal value.

No definition available.

Name:	fdef_AppraisalValueDiscountPercentage
Namespace Prefix:	fdef_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The provisional expenses recorded for impaired financing receivables.

+ References

No definition available.

+ Details

Name:	fdef_ImpairedFinancingReceivablesProvisionalExpenses
Namespace Prefix:	fdef_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Fair value measurement of mortgage servicing rights.

+ References

No definition available.

+ Details

Name:	fdef_MortgageServicingRightsAtFairValue
Namespace Prefix:	fdef_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value of real estate held for sales during the period

+ References

No definition available.

+ Details

Name:	fdef_RealEstateHeldForSaleIncreaseDecreaseInFairValue
Namespace Prefix:	fdef_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Reduction in valuation allowance of Mortgage servicing rights.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_FairValueOptionQualitativeDisclosuresRelatedToElectionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 14A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953550-111524

+ Details

Name:	us-gaap_ImpairedFinancingReceivableRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524

+ Details

Name:	us-gaap_ImpairedFinancingReceivableRelatedAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash inflow associated with the collection, including prepayments, of loans receivable issued for financing of goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

+ Details

Name:	us-gaap_ProceedsFromCollectionOfLoansReceivable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_EligibleItemOrGroupForFairValueOptionAxis=fdef_CollateralDependentLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Fair Value (Details Textual) (USD $)	3 Months Ended
Fair Value (Details Textual) (USD $)	Mar. 31, 2015	Mar. 31, 2014	Mar. 01, 2015	Dec. 31, 2014
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Impaired Financing Receivable, Recorded Investment	$ 6,400,000			$ 7,791,000
Impaired Financing Receivables, Provisional Expenses	621,000	756,000
Mortgage Servicing Rights at Fair Value	935,000fdef_MortgageServicingRightsAtFairValue		935,000fdef_MortgageServicingRightsAtFairValue	1,034,000fdef_MortgageServicingRightsAtFairValue
Valuation Allowance of Mortgage Servicing Rights	885,000			911,000
Proceeds from Collection of Loans Receivable	26,000	7,000
Real Estate Held-for-sale, Increase (Decrease) in Fair Value	522,000
Impaired Financing Receivable, Related Allowance	640,000			1,273,000
Minimum [Member]
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Mortgage Servicing Rights at Fair Value				1,000,000
Appraisal Value Discount, Percentage	0.00%
Maximum [Member]
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Appraisal Value Discount, Percentage	20.00%
Collateral dependent loans [Member]
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Impaired Financing Receivable, Recorded Investment	6,400,000			7,800,000
Impaired Financing Receivable, Related Allowance	$ 14,000			$ 19,000