Commitments and Contingent Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fixed Rate, Commitments to make loans	$ 37,546fdef_CommitmentsAndLoansAtFixedRates	$ 57,914fdef_CommitmentsAndLoansAtFixedRates
Fixed Rate, Unused lines of credit	20,385	18,047
Fixed Rate, Standby letters of credit	0	0
Fixed Rate, Total	57,931fdef_TotalFixedRateOfInterest	75,962fdef_TotalFixedRateOfInterest
Variable Rate, Commitments to make loans	69,232fdef_CommitmentsAndLoansAtVariableRates	59,632fdef_CommitmentsAndLoansAtVariableRates
Variable Rate, Unused lines of credit	307,449	257,939
Variable Rate, Standby letters of credit	17,886	17,680
Variable Rate, Total	$ 394,567fdef_TotalVariableRateOfInterest	$ 335,251fdef_TotalVariableRateOfInterest

- Definition

Represents the amount of cash required to fully fund agreements to provide advances to borrowers and lessees at stated interest rates.

+ References

No definition available.

+ Details

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

- Definition

Represents the amount of cash required to fully fund agreements to provide advances to borrowers and lessees at interest rates that increase or decrease depending on certain facts or circumstances.

+ References

No definition available.

+ Details

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

- Definition

The total amount of the contingent obligation under letters of credit outstanding at fixed rate of interest as of the reporting date.

+ References

No definition available.

+ Details

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

- Definition

The total amount of the contingent obligation under letters of credit outstanding at fixed rate of interest as of the reporting date.

+ References

No definition available.

+ Details

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

- Definition

The maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for extending credit facility at fixed rate of interest.

+ References

No definition available.

+ Details

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

- Definition

The maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for extending credit facility at floating rate of interest.

+ References

No definition available.

+ Details

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

- Definition

The total amount of fixed rate of interest as of the reporting date.

+ References

No definition available.

+ Details

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

- Definition

The total amount of variable rate of interest as of the reporting date.

+ References

No definition available.

+ Details

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