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Commitments And Contingencies (Outstanding Commitments ) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Commercial Commitments To Extend Credit [Member] |  |
Loss Contingencies [Line Items] |  |
Commitments outstanding | $ 259,711 | $ 216,913
Consumer Commitments To Extend Credit (Secured) [Member] |  |
Loss Contingencies [Line Items] |  |
Commitments outstanding | 52,823 | 49,221
Consumer Commitments To Extend Credit (Unsecured) [Member] |  |
Loss Contingencies [Line Items] |  |
Commitments outstanding | 5,176 | 5,605
Commitments To Extend Credit [Member] |  |
Loss Contingencies [Line Items] |  |
Commitments outstanding | 317,710 | 271,739
Standby Letters of Credit [Member] |  |
Loss Contingencies [Line Items] |  |
Commitments outstanding | $ 26,743 | $ 25,429

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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
Name: | us-gaap_FinancialInstrumentAxis=fraf_ConsumerCommitmentsToExtendCreditSecuredMember
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: |
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Balance Type: |
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