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Regulatory Matters (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Jul. 31, 2013
Dec. 31, 2013
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments without Regulatory Approval $ 76.4us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithoutRegulatoryApproval    
Capital Ratios, Basel III, Common Equity   6.50%fraf_CapitalRatiosBaselIiiCommonEquity  
Capital Ratios, Basel III, Tier One Leverage   5.00%fraf_CapitalRatiosBaselIiiTierOneLeverage  
Capital Ratios, Basel III, Tier One Risk Based Capital   8.00%fraf_CapitalRatiosBaselIiiTierOneRiskBasedCapital  
Capital Ratios, Basel III, Total Risk Based Capital   10.00%fraf_CapitalRatiosBaselIiiTotalRiskBasedCapital  
Capital Ratios, Basel III, Capital Conservation Buffer   2.50%fraf_CapitalRatiosBaselIiiCapitalConservationBuffer  
Bank [Member]      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		   6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember