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Capital Ratios (Narrative) (Details)
Mar. 31, 2015
Dec. 31, 2014
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Capital Ratios, Basel III, Capital Conservation Buffer 0.00%fraf_CapitalRatiosBaselIiiCapitalConservationBuffer  
Future Capital Ratios Basel III Capital Conservation Buffer 2.50%fraf_FutureCapitalRatiosBaselIiiCapitalConservationBuffer  
Farmers & Merchants Trust Company [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common Equity Tier 1 Risk-based Capital Ratio: Minimum to be Well Capitalized Ratio 6.50%fraf_TangibleCapitalRequiredForWellCapitalizedToTangibleAssets
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[1]  
Tier 1 Risk-based Capital Ratio: Minimum to be Well Capitalized Ratio 8.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
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[2]  
Tier 1 Leverage Ratio: Minimum to be Well Capitalized Ratio 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
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[3] 6.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Total Risk-based Capital Ratio: Minimum to be Well Capitalized Ratio 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
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[4]  
[1] Common equity Tier 1 capital/ total risk-weighted assets
[2] Tier 1 capital / total risk-weighted assets
[3] Tier 1 capital / average quarterly assets
[4] Total risk-based capital / total risk-weighted assets