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Tax Credit Investments (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Effective Income Tax Rate Reconciliation, Tax Credit, Amount [Abstract] |  |
Investment | $ (382) |
Federal tax credits | 122 | $ 367
Net amortization | $ 447 | $ 0

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- Definition Federal Tax Credits + References No definition available. + Details
Name: | fraf_FederalTaxCredits
Namespace Prefix: | fraf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Investment + References No definition available. + Details
Name: | fraf_Investment
Namespace Prefix: | fraf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Net Amortization + References No definition available. + Details
Name: | fraf_NetAmortization
Namespace Prefix: | fraf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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