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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

X

- Definition

Federal Reserve, reduction in reserve requirement, percent.

+ References

No definition available.

+ Details

Name:	fraf_FederalReserveReductionInReserveRequirementPercent
Namespace Prefix:	fraf_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- 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

Name:	us-gaap_CashReserveDepositRequiredAndMade
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_RestrictedCashAndInvestmentsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration