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Restricted Cash Balances (Narrative) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022
Restricted Cash Balances [Abstract] |  |
Federal Reserve, reduction in reserve requirement, percent | 0.00% |
Reserves | $ 0 | $ 0

X
- Definition Federal Reserve, reduction in reserve requirement, percent. + References No definition available. + Details
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Namespace Prefix: | fraf_
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Balance Type: | na
Period Type: | duration

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- Definition Cash deposited in a special reserve account for the exclusive benefit of customers pursuant to SEC Regulations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 210 -Topic 942 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481281/942-210-50-1 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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