Investment Securities (Details Textual) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Security Owned and Pledged as Collateral Carrying Value	$ 141,200,000	$ 132,700,000
Investment Portfolio, Number of Securities		356
Investment Portfolio, Number of Securities, Unrealized Loss		26
Realized Investment Gains (Losses)	932,000us-gaap_RealizedInvestmentGainsLosses	97,000us-gaap_RealizedInvestmentGainsLosses	2,100,000us-gaap_RealizedInvestmentGainsLosses
Realized Investment Gains Losses, Net of Tax	652,000	68,000	1,400,000
Other Comprehensive Income (Loss), before Tax	5,610,000	(5,736,000)
Investment Portfolio Single Security	10.00%fdef_InvestmentPortfolioSingleSecurity
Collateralized Debt Obligations [Member]
Other Comprehensive Income (Loss), before Tax	0	645,000
One Collateralized Debt Obligations [Member]
Other Than Temporary Impairment Write Down Of Debt Obligations Gross		337,000	4,500
Other Than Temporary Impairment Write Down Of Debt Obligations Net		$ 219,000	$ 2,900

Number of securities held in portfolio consist unrealized loss for the period.

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Number of securities held in portfolio for the period.

+ References

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The percentage assumed by the company's equity to be investment securities for the period.

+ References

No definition available.

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- Definition

The amount by which the debt obligation is reduced as a result of other-than-temporary impairment (OTTI).

+ References

No definition available.

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- Definition

The net of tax amount by which the debt obligation is reduced as a result of other-than-temporary impairment (OTTI)

+ References

No definition available.

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The net realized gains or losses on investments during the period.

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- Definition

Investment securities with a carrying amount and pledged to counterparties as collateral on public deposits for the period.

+ References

No definition available.

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- Definition

Amount before tax, after reclassification adjustments of other comprehensive income (loss).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 1A

-URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669619-108580

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-Name Accounting Standards Codification

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-SubTopic 10

-Section 45

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The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-04.3(a))

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 3

-Subparagraph a

-Article 7

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