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Restricted Cash Balances (Narrative) (Details) - USD ($) | 1 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Restricted Cash Balances [Abstract] |  |  |
Federal Reserve, reduction in reserve requirement, percent | 0.00% |  |
Reserves |  | $ 0 | $ 10,100,000

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- Definition Federal Reserve, reduction in reserve requirement, percent. + References No definition available. + Details
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Namespace Prefix: | fraf_
Data Type: | num:percentItemType
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 -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=116631393&loc=SL116631396-227033 + 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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