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FHLB Advances (Narrative) (Details)	Sep. 30, 2018 USD ($)
FHLB Advances [Abstract]
Amount borrowed from FHLB	$ 15,000,000

X

- Definition

Federal Home Loan Banks, Amount Borrowed

+ References

No definition available.

+ Details

Name:	fdbc_FederalHomeLoanBanksAmountBorrowed
Namespace Prefix:	fdbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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