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Investments (Narrative) (Details) (USD $)
3 Months Ended
Mar. 31, 2015
security
Dec. 31, 2014
security
Mar. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]        
Impairment writedown on securities recognized in earnings $ 20,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet      
Available-for-sale Securities 176,740,000us-gaap_AvailableForSaleSecurities 171,751,000us-gaap_AvailableForSaleSecurities    
Securities pledged as collateral 75,600,000us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral 91,600,000us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral    
Gross Unrealized Losses 1,170,000fraf_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments 1,393,000fraf_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments    
Cumulative OTTI Charges 555,000us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld 535,000us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld 515,000us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld 515,000us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld
Number of temporarily impaired securities 68us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1 70us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1    
Fair value of temporarily impaired securities 41,782,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue 45,488,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue    
Period of determining credit related loss, in days 60 days      
Restricted stock 438,000us-gaap_FederalHomeLoanBankStock 438,000us-gaap_FederalHomeLoanBankStock    
Federal Home Loan Bank of Pittsburgh [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Restricted stock 30,000us-gaap_FederalHomeLoanBankStock
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfPittsburghMember
     
Restricted stock per share $ 100fraf_RestrictedStockCost
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfPittsburghMember
     
Municipal Securities [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities 73,064,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
68,366,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
   
Change in unrealized losses 50,000us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
     
Gross Unrealized Losses 241,000fraf_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
292,000fraf_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
   
Number of temporarily impaired securities 22us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
23us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
   
Fair value of temporarily impaired securities 14,071,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
15,092,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
   
Equity Securities [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities 1,043,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
1,053,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
   
Gross Unrealized Losses 14,000fraf_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
     
Number of temporarily impaired securities 1us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
     
Fair value of temporarily impaired securities 824,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
     
Trust Preferred Securities [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities 5,190,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_TrustPreferredSecuritiesMember
5,137,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_TrustPreferredSecuritiesMember
   
Gross Unrealized Gain (Loss) (756,000)fraf_AvailableForSaleSecuritiesGrossUnrealizedGainLossAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_TrustPreferredSecuritiesMember
     
Gross Unrealized Losses 756,000fraf_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_TrustPreferredSecuritiesMember
803,000fraf_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_TrustPreferredSecuritiesMember
   
Number of temporarily impaired securities 7us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_TrustPreferredSecuritiesMember
7us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_TrustPreferredSecuritiesMember
   
Fair value of temporarily impaired securities 5,190,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_TrustPreferredSecuritiesMember
5,137,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_TrustPreferredSecuritiesMember
   
Private-Label Mortgage-Backed Securities [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities 1,627,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
1,695,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
   
Gross Unrealized Gain (Loss) 44,000fraf_AvailableForSaleSecuritiesGrossUnrealizedGainLossAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
     
Gross Unrealized Losses   15,000fraf_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
   
Cumulative OTTI Charges 555,000us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
     
Number of temporarily impaired securities   1us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
   
Fair value of temporarily impaired securities   $ 540,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember