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Loan Quality And Allowance For Credit Losses (Narrative) (Details) - USD ($) | Mar. 31, 2023 | Dec. 31, 2022
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Loan Quality And Allowance For Credit Losses [Abstract] |  |
Loan Deferral Or Modification, Granted, Amount | $ 120,000 | $ 120,000

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- 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

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