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Commitments And Contingencies (Narrative) (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2021 | Mar. 31, 2020 | Sep. 30, 2021
Commitments And Contingencies [Abstract] |  |  |  |
Allowance against letters of credit | $ 2,400 |  |  | $ 1,500
Letters of credit cancelled |  | $ 636 | $ 250 |

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- Definition Letters of credit cancelled. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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

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