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Note 11 - Leases (Details Textual) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($)
Number of Properties Leased under Operating Lease | 10 |
Lease, Cost | $ 274 | $ 296
Lessor, Number of Properties Under Long-Term Operating Leases | 1 |
Premises and Equipment Expense [Member] |  |
Lease, Cost | $ 268 | 290
Other Expense [Member] |  |
Lease, Cost | $ 6 | $ 6
Administrative Office [Member] |  |
Number of Properties Leased under Operating Lease | 1 |
Land [Member] |  |
Number of Properties Leased under Operating Lease | 4 |
Number of Leases Classified as Finance Lease | 1 |
Standalone ATM [Member] |  |
Number of Properties Leased under Operating Lease | 2 |
Equipment [Member] |  |
Number of Leases Classified as Finance Lease | 4 |

X
- Definition The number of properties under long-term operating leases as a lessor. + References No definition available. + Details
Name: | fdbc_LessorNumberOfPropertiesUnderLongtermOperatingLeases
Namespace Prefix: | fdbc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of leases classified as financing lease. + References No definition available. + Details
Name: | fdbc_NumberOfLeasesClassifiedAsFinanceLease
Namespace Prefix: | fdbc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition The number of properties leased under operating lease. + References No definition available. + Details
Name: | fdbc_NumberOfPropertiesLeasedUnderOperatingLease
Namespace Prefix: | fdbc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of lease cost recognized by lessee for lease contract. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-4 + Details
Name: | us-gaap_LeaseCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_IncomeStatementLocationAxis=fdbc_PremisesAndEquipmentExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_OtherExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=fdbc_AdministrativeOfficeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=fdbc_StandaloneATMMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_EquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |