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Leases (Narrative) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2023 USD ($) item	Jun. 30, 2022 USD ($)
Leases [Abstract]
Number of leases with a variable payment based on an index | item	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
Lease termination expenses	$ 525
Noncash decrease in right-of-use asset	507
Noncash extinguishment of lease liability	$ 537

X

- Definition

Noncash decrease in right-of-use asset,

+ References

No definition available.

+ Details

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

X

- Definition

Noncash extinguishment of lease liability.

+ References

No definition available.

+ Details

Name:	fraf_NoncashExtinguishmentOfLeaseLiability
Namespace Prefix:	fraf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918673-209980

+ 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(5)
-URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918673-209980

+ Details

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

X

- Definition

Amount of operating lease expense. Excludes sublease income.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 4
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=123391704&loc=SL77918638-209977

+ Details

Name:	us-gaap_OperatingLeaseExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration