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Deposits (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Deposits [Abstract]
Time deposits greater than $250,000	$ 47.3	$ 44.4

X

- Definition

Time Deposits 250000 Or More

+ References

No definition available.

+ Details

Name:	fraf_TimeDeposits250000OrMore
Namespace Prefix:	fraf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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