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Deposits (Maturity Of Time Deposits Of $250,000 Or More) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Deposits [Abstract] |  |
Within three months | $ 2,359 |
Over three through six months | 1,227 |
Over six through twelve months | 258 |
Over twelve months | 1,688 |
Total | $ 5,532 | $ 12,000

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- Definition Contractual Maturities Time Deposits 250000 Or More After 12 Months + 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 Contractual Maturities Time Deposits 250000 Or More Six Months Through 12 Months + References No definition available. + Details
Name: | fraf_ContractualMaturitiesTimeDeposits250000OrMoreSixMonthsThrough12Months
Namespace Prefix: | fraf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Contractual Maturities Time Deposits 250000 Or More Three Months Or Less + References No definition available. + Details
Name: | fraf_ContractualMaturitiesTimeDeposits250000OrMoreThreeMonthsOrLess
Namespace Prefix: | fraf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Contractual Maturities Time Deposits 250000 Or More Three Months Through Six Months + 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 Time Deposits 250000 Or More + References No definition available. + Details
Name: | fraf_TimeDeposits250000OrMore
Namespace Prefix: | fraf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_DepositsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration