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Commitments And Contingencies (Narrative) (Details) - USD ($) $ in Thousands		9 Months Ended
	Jun. 30, 2018	Sep. 30, 2018
Commitments And Contingencies [Abstract]
Allowance against letters of credit	$ 2,400	$ 2,361

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- Definition

Off Balance Sheet Reserves

+ References

No definition available.

+ Details

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Namespace Prefix:	fraf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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