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Commitments And Contingencies (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Jul. 31, 2018
Commitments And Contingencies [Abstract] |  |  |
Standby letters of credit extension period, in years | 1 year |  |
Allowance against letters of credit |  | $ 2,361 |
Letters of credit cancelled | $ 250 |  |
Accrued settlement payment |  |  | $ 10,000

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- Definition Letters of credit cancelled. + References No definition available. + Details
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Balance Type: | debit
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- Definition Off Balance Sheet Reserves + References No definition available. + Details
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Namespace Prefix: | fraf_
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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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Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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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=118942415&loc=d3e14326-108349 + Details
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Balance Type: | credit
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