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Commitments And Contingencies (Narrative) (Details) | 3 Months Ended
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Mar. 31, 2024
Commitments And Contingencies [Abstract] |
Standby letters of credit extension period, in years | 1 year

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- Definition Stand by Letters Of Credit Extension Periods + References No definition available. + Details
Name: | fraf_StandByLettersOfCreditExtensionPeriods
Namespace Prefix: | fraf_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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