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Commitments And Contingencies (Narrative) (Details)	9 Months Ended
	Sep. 30, 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