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LOANS (Details 8) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Financing Receivable, Modifications [Line Items]    
Financing Receivable Type Of Modification Extension Of Term Amount $ 752fncb_FinancingReceivableTypeOfModificationExtensionOfTermAmount $ 373fncb_FinancingReceivableTypeOfModificationExtensionOfTermAmount
Financing Receivable Type Of Modifications Extension Of Term And Capitalization Of Taxes   240fncb_FinancingReceivableTypeOfModificationsExtensionOfTermAndCaptilizationOfTaxes
Financing Receivable Type of Modifications Amount 752fncb_FinancingReceivableTypeOfModificationsAmount 613fncb_FinancingReceivableTypeOfModificationsAmount
Residential Real Estate [Member]    
Financing Receivable, Modifications [Line Items]    
Financing Receivable Type Of Modification Extension Of Term Amount 656fncb_FinancingReceivableTypeOfModificationExtensionOfTermAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialRealEstateMember		 0fncb_FinancingReceivableTypeOfModificationExtensionOfTermAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialRealEstateMember
Financing Receivable Type Of Modifications Extension Of Term And Capitalization Of Taxes   240fncb_FinancingReceivableTypeOfModificationsExtensionOfTermAndCaptilizationOfTaxes
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialRealEstateMember
Financing Receivable Type of Modifications Amount 656fncb_FinancingReceivableTypeOfModificationsAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialRealEstateMember		 240fncb_FinancingReceivableTypeOfModificationsAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialRealEstateMember
Commercial Real Estate [Member]    
Financing Receivable, Modifications [Line Items]    
Financing Receivable Type Of Modification Extension Of Term Amount 0fncb_FinancingReceivableTypeOfModificationExtensionOfTermAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember		 238fncb_FinancingReceivableTypeOfModificationExtensionOfTermAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
Financing Receivable Type Of Modifications Extension Of Term And Capitalization Of Taxes   0fncb_FinancingReceivableTypeOfModificationsExtensionOfTermAndCaptilizationOfTaxes
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
Financing Receivable Type of Modifications Amount 0fncb_FinancingReceivableTypeOfModificationsAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember		 238fncb_FinancingReceivableTypeOfModificationsAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
Construction Land Acquisition and Development [Member]    
Financing Receivable, Modifications [Line Items]    
Financing Receivable Type Of Modification Extension Of Term Amount 96fncb_FinancingReceivableTypeOfModificationExtensionOfTermAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_ConstructionLandAcquisitionAndDevelopmentMember		 0fncb_FinancingReceivableTypeOfModificationExtensionOfTermAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_ConstructionLandAcquisitionAndDevelopmentMember
Financing Receivable Type Of Modifications Extension Of Term And Capitalization Of Taxes   0fncb_FinancingReceivableTypeOfModificationsExtensionOfTermAndCaptilizationOfTaxes
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_ConstructionLandAcquisitionAndDevelopmentMember
Financing Receivable Type of Modifications Amount 96fncb_FinancingReceivableTypeOfModificationsAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_ConstructionLandAcquisitionAndDevelopmentMember		 0fncb_FinancingReceivableTypeOfModificationsAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_ConstructionLandAcquisitionAndDevelopmentMember
Commercial and Industrial Loan [Member]    
Financing Receivable, Modifications [Line Items]    
Financing Receivable Type Of Modification Extension Of Term Amount 0fncb_FinancingReceivableTypeOfModificationExtensionOfTermAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_CommercialAndIndustrialLoanMember		 0fncb_FinancingReceivableTypeOfModificationExtensionOfTermAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_CommercialAndIndustrialLoanMember
Financing Receivable Type Of Modifications Extension Of Term And Capitalization Of Taxes   0fncb_FinancingReceivableTypeOfModificationsExtensionOfTermAndCaptilizationOfTaxes
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_CommercialAndIndustrialLoanMember
Financing Receivable Type of Modifications Amount 0fncb_FinancingReceivableTypeOfModificationsAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_CommercialAndIndustrialLoanMember		 0fncb_FinancingReceivableTypeOfModificationsAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_CommercialAndIndustrialLoanMember
Consumer Loan [Member]    
Financing Receivable, Modifications [Line Items]    
Financing Receivable Type Of Modification Extension Of Term Amount 0fncb_FinancingReceivableTypeOfModificationExtensionOfTermAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ConsumerLoanMember		 135fncb_FinancingReceivableTypeOfModificationExtensionOfTermAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ConsumerLoanMember
Financing Receivable Type Of Modifications Extension Of Term And Capitalization Of Taxes   0fncb_FinancingReceivableTypeOfModificationsExtensionOfTermAndCaptilizationOfTaxes
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ConsumerLoanMember
Financing Receivable Type of Modifications Amount 0fncb_FinancingReceivableTypeOfModificationsAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ConsumerLoanMember		 135fncb_FinancingReceivableTypeOfModificationsAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ConsumerLoanMember
State and Political Subdivisions [Member]    
Financing Receivable, Modifications [Line Items]    
Financing Receivable Type Of Modification Extension Of Term Amount 0fncb_FinancingReceivableTypeOfModificationExtensionOfTermAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 0fncb_FinancingReceivableTypeOfModificationExtensionOfTermAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Financing Receivable Type Of Modifications Extension Of Term And Capitalization Of Taxes   0fncb_FinancingReceivableTypeOfModificationsExtensionOfTermAndCaptilizationOfTaxes
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Financing Receivable Type of Modifications Amount $ 0fncb_FinancingReceivableTypeOfModificationsAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 $ 0fncb_FinancingReceivableTypeOfModificationsAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember