Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Derivatives not designated as hedging instruments
Mortgage Banking Derivatives Assets, Carrying Value	$ 921	$ 558
Mortgage Banking Derivatives Liabilities, Carrying Value	(126)	0
Mortgage Banking Derivatives, Net Carrying Value	$ 795	$ 558

Carrying values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

No definition available.

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