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v3.20.1

Leases (Narrative) (Details) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 USD ($) item | Mar. 31, 2019 USD ($)
Leases [Line Items] |  |
Number of properties leased under operating lease | 6 |
Number of leases classified as finance lease | 2 |
Total lease cost | $ | $ 134 | $ 134
Number of lessor leases | 7 |
Residential [Member] |  |
Leases [Line Items] |  |
Number of lessor leases | 4 |
Long-Term [Member] |  |
Leases [Line Items] |  |
Number of lessor leases | 3 |
Premise and Equipment [Member] |  |
Leases [Line Items] |  |
Total lease cost | $ | $ 125 |
Other Expense [Member] |  |
Leases [Line Items] |  |
Total lease cost | $ | $ 9 |
Land [Member] |  |
Leases [Line Items] |  |
Number of properties leased under operating lease | 4 |
Standalone ATM [Member] |  |
Leases [Line Items] |  |
Number of properties leased under operating lease | 3 |

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- Definition Leases [Line Items] + References No definition available. + Details
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Namespace Prefix: | fdbc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of Leases Classified as Finance Lease + References No definition available. + Details
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- Definition Number of Properties Leased under Operating Lease + References No definition available. + Details
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Balance Type: | na
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- Definition Operating Lease, Lessor, Number Of Leases + References No definition available. + Details
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Namespace Prefix: | fdbc_
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Balance Type: | na
Period Type: | duration

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- Definition Amount of lease cost recognized by lessee for lease contract. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |