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Commitments And Contingencies (Narrative) (Details) - USD ($) $ in Thousands |  | 12 Months Ended
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Jun. 30, 2018 | Dec. 31, 2020
Commitments And Contingencies [Abstract] |  |
Standby letters of credit extension period, in years |  | 1 year
Allowance against letters of credit | $ 2,400 |
Letters of credit cancelled |  | $ 250
Accrued settlement payment |  | $ 2,100

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- Definition Letters of credit cancelled. + 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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- 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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- Definition Standby Letters Of Credit Extension Periods + References No definition available. + Details
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Namespace Prefix: | fraf_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Amount of loss contingency liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant