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Leases (Narrative) (Details)	3 Months Ended
	Mar. 31, 2024 item
Leases [Abstract]
Number of leases with a variable payment based on an index	1
Lessee, Operating Lease, Option to Extend	may contain renewal options after the initial term
Lessee, Operating Lease, Restriction or Covenant	None of the leases contain any restrictive covenants

X

- Definition

Number of leases with a variable payment based on an index

+ References

No definition available.

+ Details

Name:	fraf_NumberOfLeasesWithVariablePaymentBasedOnIndex
Namespace Prefix:	fraf_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

Description of terms and conditions of option to extend lessee's operating lease. Includes, but is not limited to, information about option recognized as part of right-of-use asset and lease liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147478964/842-20-50-3

+ Details

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

X

- Definition

Description of restriction or covenant imposed by operating lease. Includes, but is not limited to, those relating to dividends or incurring additional financial obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(5)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147478964/842-20-50-3

+ Details

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