Investment Securities (Details Textual) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015
Security Owned and Pledged as Collateral Carrying Value	$ 137.9
Investment Portfolio, Number of Securities	366
Investment Portfolio, Number of Securities, Unrealized Loss	18

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

No definition available.

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