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v3.25.3

Deposits (Narrative) (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Deposits [Abstract] |  |
Time deposits greater than $250,000 | $ 54.9 | $ 77.4

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- Definition Time Deposits 250000 Or More + References No definition available. + Details
Name: | fraf_TimeDeposits250000OrMore
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_DepositsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration