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Leases (Narrative) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 USD ($) item
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
Noncash decrease in right-of-use asset | $ 507
Noncash extinguishment of lease liability | $ 537

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- Definition Noncash decrease in right-of-use asset, + References No definition available. + Details
Name: | fraf_NoncashDecreaseInRightOfUseAsset
Namespace Prefix: | fraf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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

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- 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

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- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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

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- 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