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Other Real Estate Owned (Details Textual) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Mar. 31, 2015
Other Real Estate Owned Properties [Line Items]    
Real Estate Investment Property, Net $ 27us-gaap_RealEstateInvestmentPropertyNet  
One Residential Real Estate [Member]    
Other Real Estate Owned Properties [Line Items]    
Real Estate Investment Property, Net   149us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= fncb_OneResidentialRealEstateMember
Three Residential Real Estate [Member]    
Other Real Estate Owned Properties [Line Items]    
Real Estate Investment Property, Net   $ 176us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= fncb_ThreeResidentialRealEstateMember