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Leases (Analysis of Leased Property under Finance Leases) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Equipment	$ 397	$ 397
Less accumulated depreciation and amortization	(137)	(117)
Leased property under finance leases, net	$ 260	$ 280

X

- Definition

Finance Lease, Leased Property, Accumulated Depreciation, Depletion and Amortization

+ References

No definition available.

+ Details

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

X

- Definition

Finance Lease, Leased Property, Gross

+ References

No definition available.

+ Details

Name:	fdbc_FinanceLeaseLeasedPropertyGross
Namespace Prefix:	fdbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Finance Lease, Leased Property, Net

+ References

No definition available.

+ Details

Name:	fdbc_FinanceLeaseLeasedPropertyNet
Namespace Prefix:	fdbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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