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Commitments And Contingencies (Outstanding Commitments ) (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Commercial Commitments To Extend Credit [Member] |  |
Loss Contingencies [Line Items] |  |
Commitments outstanding | $ 281,285 | $ 288,075
Consumer Commitments To Extend Credit (Secured) [Member] |  |
Loss Contingencies [Line Items] |  |
Commitments outstanding | 90,243 | 82,095
Consumer Commitments To Extend Credit (Unsecured) [Member] |  |
Loss Contingencies [Line Items] |  |
Commitments outstanding | 5,310 | 5,389
Commitments To Extend Credit [Member] |  |
Loss Contingencies [Line Items] |  |
Commitments outstanding | 376,838 | 375,559
Standby Letters of Credit [Member] |  |
Loss Contingencies [Line Items] |  |
Commitments outstanding | $ 26,487 | $ 23,284

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- Definition Commitments Outstanding + References No definition available. + Details
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Namespace Prefix: | fraf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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: |
Data Type: | na
Balance Type: |
Period Type: |

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