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Loan Quality And Allowance For Loan Losses (Narrative) (Details) - USD ($)	Jun. 30, 2022	Dec. 31, 2021
Loan Quality And Allowance For Loan Losses [Abstract]
Loan Deferral Or Modification, Granted, Amount	$ 38,000	$ 38,000

X

- Definition

Loan Deferral Or Modification, Granted, Amount.

+ References

No definition available.

+ Details

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Namespace Prefix:	fraf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration