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Commitments And Contingencies (Narrative) (Details) - USD ($) $ in Thousands |  | 9 Months Ended
--- | --- | ---
Jun. 30, 2018 | Sep. 30, 2020
Commitments And Contingencies [Abstract] |  |
Allowance against letters of credit | $ 2,400 | $ 2,100
Letters of credit cancelled |  | $ 250

X
- Definition Letters of credit cancelled. + References No definition available. + Details
Name: | fraf_LettersOfCreditCancelled
Namespace Prefix: | fraf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Off Balance Sheet Reserves + References No definition available. + Details
Name: | fraf_OffBalanceSheetReserves
Namespace Prefix: | fraf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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