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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

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- 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

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- 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

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- 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

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- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration