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Investments (Private Label Mortgage Backed Securities) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost $ 169,399us-gaap_AvailableForSaleSecuritiesAmortizedCost $ 160,415us-gaap_AvailableForSaleSecuritiesAmortizedCost  
Investment securities available for sale, at fair value 171,751us-gaap_AvailableForSaleSecurities 159,674us-gaap_AvailableForSaleSecurities  
Cumulative OTTI Charges 535us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld 515us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld 490us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld
Private-Label Mortgage-Backed Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 1,675us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember		 1,984us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember		  
Investment securities available for sale, at fair value 1,695us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember		 1,969us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember		  
Gross Unrealized Gain (Loss) 20fraf_AvailableForSaleSecuritiesGrossUnrealizedGainLossAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember		    
Cumulative OTTI Charges 535us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember		    
Lowest Credit Rating Assigned: Standard & Poor's, BBB+ Rating [Member] | RALI2004-QS4 A7 [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Origination Date Mar. 01, 2004    
Amortized Cost 83us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsBBBPlusRatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_Rali2004Qs4A7Member		    
Investment securities available for sale, at fair value 86us-gaap_AvailableForSaleSecurities
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsBBBPlusRatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_Rali2004Qs4A7Member		    
Gross Unrealized Gain (Loss) 3fraf_AvailableForSaleSecuritiesGrossUnrealizedGainLossAccumulatedInInvestments
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsBBBPlusRatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_Rali2004Qs4A7Member		    
Credit Support % 12.22%us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureOtherLoanToCollateralValue
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsBBBPlusRatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_Rali2004Qs4A7Member		    
Lowest Credit Rating Assigned: Standard & Poor's, CCC Rating [Member] | MALT2004-6 7A1 [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Origination Date Jun. 01, 2004    
Amortized Cost 411us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsCCCRatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_Malt200467a1Member		    
Investment securities available for sale, at fair value 421us-gaap_AvailableForSaleSecurities
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsCCCRatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_Malt200467a1Member		    
Gross Unrealized Gain (Loss) 10fraf_AvailableForSaleSecuritiesGrossUnrealizedGainLossAccumulatedInInvestments
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsCCCRatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_Malt200467a1Member		    
Credit Support % 14.14%us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureOtherLoanToCollateralValue
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsCCCRatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_Malt200467a1Member		    
Lowest Credit Rating Assigned: Standard & Poor's, CC Rating [Member] | RALI2005-QS2 A1 [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Origination Date Feb. 01, 2005    
Amortized Cost 262us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsCCRatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_Rali2005Qs2A1Member		    
Investment securities available for sale, at fair value 274us-gaap_AvailableForSaleSecurities
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsCCRatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_Rali2005Qs2A1Member		    
Gross Unrealized Gain (Loss) 12fraf_AvailableForSaleSecuritiesGrossUnrealizedGainLossAccumulatedInInvestments
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsCCRatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_Rali2005Qs2A1Member		    
Credit Support % 5.86%us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureOtherLoanToCollateralValue
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsCCRatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_Rali2005Qs2A1Member		    
Cumulative OTTI Charges 10us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsCCRatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_Rali2005Qs2A1Member		    
Lowest Credit Rating Assigned: Standard & Poor's, D Rating [Member] | RALI2006-QS4 A2 [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Origination Date Apr. 01, 2006    
Amortized Cost 555us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsDRatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_Rali2006Qs4A2Member		    
Investment securities available for sale, at fair value 540us-gaap_AvailableForSaleSecurities
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsDRatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_Rali2006Qs4A2Member		    
Gross Unrealized Gain (Loss) (15)fraf_AvailableForSaleSecuritiesGrossUnrealizedGainLossAccumulatedInInvestments
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsDRatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_Rali2006Qs4A2Member		    
Cumulative OTTI Charges 293us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsDRatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_Rali2006Qs4A2Member		    
Lowest Credit Rating Assigned: Standard & Poor's, D Rating [Member] | GSR 2006-5F 2A1 [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Origination Date May 01, 2006    
Amortized Cost 83us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsDRatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_Gsr20065f2a1Member		    
Investment securities available for sale, at fair value 89us-gaap_AvailableForSaleSecurities
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsDRatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_Gsr20065f2a1Member		    
Gross Unrealized Gain (Loss) 6fraf_AvailableForSaleSecuritiesGrossUnrealizedGainLossAccumulatedInInvestments
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsDRatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_Gsr20065f2a1Member		    
Cumulative OTTI Charges 15us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsDRatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_Gsr20065f2a1Member		    
Lowest Credit Rating Assigned: Standard & Poor's, D Rating [Member] | RALI2006-QS8 A1 [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Origination Date Jul. 28, 2006    
Amortized Cost 281us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsDRatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_Rali2006Qs8A1Member		    
Investment securities available for sale, at fair value 285us-gaap_AvailableForSaleSecurities
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsDRatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_Rali2006Qs8A1Member		    
Gross Unrealized Gain (Loss) 4fraf_AvailableForSaleSecuritiesGrossUnrealizedGainLossAccumulatedInInvestments
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsDRatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_Rali2006Qs8A1Member		    
Cumulative OTTI Charges $ 217us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsDRatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_Rali2006Qs8A1Member