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Fair Value Measurements (Details Textual) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Impaired Financing Receivable, Related Allowance $ 417us-gaap_ImpairedFinancingReceivableRelatedAllowance $ 384us-gaap_ImpairedFinancingReceivableRelatedAllowance
Real Estate Owned, Valuation Allowance 94us-gaap_RealEstateOwnedValuationAllowance  
Valuation Allowance, Real Estate Owned [Member]    
Real Estate Owned, Valuation Allowance 12us-gaap_RealEstateOwnedValuationAllowance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceRealEstateOwnedMember
1,600us-gaap_RealEstateOwnedValuationAllowance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceRealEstateOwnedMember
Estimates Selling Costs of Appraised Value 10.00%fncb_EstimatesSellingCostsOfAppraisedValue
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceRealEstateOwnedMember
10.00%fncb_EstimatesSellingCostsOfAppraisedValue
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceRealEstateOwnedMember
Impaired Loans [Member]    
Impaired Financing Receivable, Related Allowance $ 146us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis
= fncb_ImpairedLoansMember
$ 102us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis
= fncb_ImpairedLoansMember