Label	Element	Value
West Scranton Branch Of Wayne Bank [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Non-cash Assets	fdbc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNonCashAssets	$ 2,051,000

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Non-cash Assets

No definition available.

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