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Loan Quality (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan deferrals or modifications	$ 120,000	$ 38,000
Interest not recognized on nonaccrual loans	6,000	115,000
Impaired loans	3,000,000.0	$ 11,600,000
Financing Receivable, Troubled Debt Restructuring, Increase (Decrease) In Current Period	0
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired loans balances, added to general allocation pool	$ 250,000

X

- Definition

Financing Receivable, Troubled Debt Restructuring, Increase (Decrease) In Current Period

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Impaired Loans Balances Added To General Allocation Pool

+ References

No definition available.

+ Details

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Namespace Prefix:	fraf_
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Balance Type:	debit
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X

- Definition

Loan deferrals or modifications.

+ References

No definition available.

+ Details

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Namespace Prefix:	fraf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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- Definition

Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953550-111524

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant

X

- Definition

Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=121585226&loc=d3e18794-111554

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