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Investments (Private Label Mortgage Backed Securities) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]        
Amortized cost $ 174,393us-gaap_AvailableForSaleSecuritiesAmortizedCost $ 169,399us-gaap_AvailableForSaleSecuritiesAmortizedCost    
Investment securities available for sale, at fair value 176,740us-gaap_AvailableForSaleSecurities 171,751us-gaap_AvailableForSaleSecurities    
Cumulative OTTI Charges 555us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld 535us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld 515us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld 515us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld
Private-Label Mortgage-Backed Securities [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Amortized cost 1,583us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember		 1,675us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember		    
Investment securities available for sale, at fair value 1,627us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember		 1,695us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember		    
Gross Unrealized Gain (Loss) 44fraf_AvailableForSaleSecuritiesGrossUnrealizedGainLossAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember		      
Cumulative OTTI Charges 555us-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 64us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsBBBPlusRatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_Rali2004Qs4A7Member		      
Investment securities available for sale, at fair value 66us-gaap_AvailableForSaleSecurities
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsBBBPlusRatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_Rali2004Qs4A7Member		      
Gross Unrealized Gain (Loss) 2fraf_AvailableForSaleSecuritiesGrossUnrealizedGainLossAccumulatedInInvestments
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsBBBPlusRatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_Rali2004Qs4A7Member		      
Collateral Type ALT A      
Lowest Credit Rating Assigned to Private Label Mortgage Backed Securities BBB+      
Credit Support % 12.21%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 396us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsCCCRatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_Malt200467a1Member		      
Investment securities available for sale, at fair value 405us-gaap_AvailableForSaleSecurities
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsCCCRatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_Malt200467a1Member		      
Gross Unrealized Gain (Loss) 9fraf_AvailableForSaleSecuritiesGrossUnrealizedGainLossAccumulatedInInvestments
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsCCCRatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_Malt200467a1Member		      
Collateral Type ALT A      
Lowest Credit Rating Assigned to Private Label Mortgage Backed Securities CCC      
Credit Support % 13.87%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 250us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsCCRatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_Rali2005Qs2A1Member		      
Investment securities available for sale, at fair value 265us-gaap_AvailableForSaleSecurities
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsCCRatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_Rali2005Qs2A1Member		      
Gross Unrealized Gain (Loss) 15fraf_AvailableForSaleSecuritiesGrossUnrealizedGainLossAccumulatedInInvestments
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsCCRatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_Rali2005Qs2A1Member		      
Collateral Type ALT A      
Lowest Credit Rating Assigned to Private Label Mortgage Backed Securities CC      
Credit Support % 5.16%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 521us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsDRatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_Rali2006Qs4A2Member		      
Investment securities available for sale, at fair value 524us-gaap_AvailableForSaleSecurities
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsDRatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_Rali2006Qs4A2Member		      
Gross Unrealized Gain (Loss) 3fraf_AvailableForSaleSecuritiesGrossUnrealizedGainLossAccumulatedInInvestments
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsDRatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_Rali2006Qs4A2Member		      
Collateral Type ALT A      
Lowest Credit Rating Assigned to Private Label Mortgage Backed Securities D      
Cumulative OTTI Charges 313us-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 79us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsDRatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_Gsr20065f2a1Member		      
Investment securities available for sale, at fair value 86us-gaap_AvailableForSaleSecurities
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsDRatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_Gsr20065f2a1Member		      
Gross Unrealized Gain (Loss) 7fraf_AvailableForSaleSecuritiesGrossUnrealizedGainLossAccumulatedInInvestments
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsDRatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_Gsr20065f2a1Member		      
Collateral Type Prime      
Lowest Credit Rating Assigned to Private Label Mortgage Backed Securities D      
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 273us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsDRatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_Rali2006Qs8A1Member		      
Investment securities available for sale, at fair value 281us-gaap_AvailableForSaleSecurities
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsDRatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_Rali2006Qs8A1Member		      
Gross Unrealized Gain (Loss) 8fraf_AvailableForSaleSecuritiesGrossUnrealizedGainLossAccumulatedInInvestments
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsDRatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_Rali2006Qs8A1Member		      
Collateral Type ALT A      
Lowest Credit Rating Assigned to Private Label Mortgage Backed Securities D      
Cumulative OTTI Charges $ 217us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld
/ us-gaap_CreditRatingStandardPoorsAxis
= us-gaap_StandardPoorsDRatingMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fraf_Rali2006Qs8A1Member