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Loans (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2021
Financing Receivable, Allowance for Credit Losses [Line Items] |
PPP Program, guarantee percentage | 100.00%
PPP program, interest rate | 1.00%
Minimum [Member] |
Financing Receivable, Allowance for Credit Losses [Line Items] |
PPP Program, maturity period | 2 years
Maximum [Member] |
Financing Receivable, Allowance for Credit Losses [Line Items] |
PPP Program, maturity period | 5 years

X
- Definition PPP Program, guarantee percentage. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

X
- Definition PPP program, interest rate. + 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 PPP Program, maturity period. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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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Balance Type: | na
Period Type: | duration

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |