XML 23 R37.htm IDEA: XBRL DOCUMENT v2.4.1.9
LOANS (Details 3) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Internal risk rating system    
Financing Receivable Recorded Investment $ 671,146fncb_FinancingReceivableRecordedInvestment $ 669,494fncb_FinancingReceivableRecordedInvestment
Subtotal Commercial Loans [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 442,499fncb_FinancingReceivableRecordedInvestment
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_SubtotalCommercialLoansMember		 443,156fncb_FinancingReceivableRecordedInvestment
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_SubtotalCommercialLoansMember
Accruing Loans [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 227,754fncb_FinancingReceivableRecordedInvestment
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_AccruingLoansMember		 225,326fncb_FinancingReceivableRecordedInvestment
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_AccruingLoansMember
Non Accruing Loans [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 893fncb_FinancingReceivableRecordedInvestment
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_NonAccruingLoansMember		 1,012fncb_FinancingReceivableRecordedInvestment
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_NonAccruingLoansMember
Subtotal Other Loans [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 228,647fncb_FinancingReceivableRecordedInvestment
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_SubtotalOtherLoansMember		 226,338fncb_FinancingReceivableRecordedInvestment
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_SubtotalOtherLoansMember
Consumer [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 122,967fncb_FinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= fncb_ConsumerMember		 122,092fncb_FinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= fncb_ConsumerMember
Consumer [Member] | Subtotal Commercial Loans [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 3,253fncb_FinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= fncb_ConsumerMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_SubtotalCommercialLoansMember		 3,539fncb_FinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= fncb_ConsumerMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_SubtotalCommercialLoansMember
Consumer [Member] | Accruing Loans [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 119,455fncb_FinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= fncb_ConsumerMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_AccruingLoansMember		 118,377fncb_FinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= fncb_ConsumerMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_AccruingLoansMember
Consumer [Member] | Non Accruing Loans [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 259fncb_FinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= fncb_ConsumerMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_NonAccruingLoansMember		 176fncb_FinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= fncb_ConsumerMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_NonAccruingLoansMember
Consumer [Member] | Subtotal Other Loans [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 119,714fncb_FinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= fncb_ConsumerMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_SubtotalOtherLoansMember		 118,553fncb_FinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= fncb_ConsumerMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_SubtotalOtherLoansMember
Pass [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 399,360fncb_FinancingReceivableRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 399,414fncb_FinancingReceivableRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass [Member] | Consumer [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 3,106fncb_FinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= fncb_ConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 3,414fncb_FinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= fncb_ConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Special Mention [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 18,946fncb_FinancingReceivableRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 17,978fncb_FinancingReceivableRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Special Mention [Member] | Consumer [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 26fncb_FinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= fncb_ConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 0fncb_FinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= fncb_ConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Substandard [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 24,193fncb_FinancingReceivableRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 25,764fncb_FinancingReceivableRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Substandard [Member] | Consumer [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 121fncb_FinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= fncb_ConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 125fncb_FinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= fncb_ConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Doubtful [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 0fncb_FinancingReceivableRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember		 0fncb_FinancingReceivableRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember
Doubtful [Member] | Consumer [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 0fncb_FinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= fncb_ConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember		 0fncb_FinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= fncb_ConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember
Loss [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 0fncb_FinancingReceivableRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= fncb_LossMember		 0fncb_FinancingReceivableRecordedInvestment
/ us-gaap_InternalCreditAssessmentAxis
= fncb_LossMember
Loss [Member] | Consumer [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 0fncb_FinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= fncb_ConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= fncb_LossMember		 0fncb_FinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= fncb_ConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= fncb_LossMember
Residential Real Estate [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 125,488fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialRealEstateMember		 122,832fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialRealEstateMember
Residential Real Estate [Member] | Subtotal Commercial Loans [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 22,395fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialRealEstateMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_SubtotalCommercialLoansMember		 21,420fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialRealEstateMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_SubtotalCommercialLoansMember
Residential Real Estate [Member] | Accruing Loans [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 102,493fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialRealEstateMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_AccruingLoansMember		 100,576fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialRealEstateMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_AccruingLoansMember
Residential Real Estate [Member] | Non Accruing Loans [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 600fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialRealEstateMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_NonAccruingLoansMember		 836fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialRealEstateMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_NonAccruingLoansMember
Residential Real Estate [Member] | Subtotal Other Loans [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 103,093fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialRealEstateMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_SubtotalOtherLoansMember		 101,412fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialRealEstateMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_SubtotalOtherLoansMember
Residential Real Estate [Member] | Pass [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 20,901fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 19,892fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Residential Real Estate [Member] | Special Mention [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 442fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 451fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Residential Real Estate [Member] | Substandard [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 1,052fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 1,077fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Residential Real Estate [Member] | Doubtful [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 0fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember		 0fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember
Residential Real Estate [Member] | Loss [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 0fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= fncb_LossMember		 0fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= fncb_LossMember
Commercial Real Estate [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 226,800fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember		 233,473fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
Commercial Real Estate [Member] | Subtotal Commercial Loans [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 226,800fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_SubtotalCommercialLoansMember		 233,473fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_SubtotalCommercialLoansMember
Commercial Real Estate [Member] | Accruing Loans [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 0fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_AccruingLoansMember		 0fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_AccruingLoansMember
Commercial Real Estate [Member] | Non Accruing Loans [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 0fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_NonAccruingLoansMember		 0fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_NonAccruingLoansMember
Commercial Real Estate [Member] | Subtotal Other Loans [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 0fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_SubtotalOtherLoansMember		 0fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_SubtotalOtherLoansMember
Commercial Real Estate [Member] | Pass [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 198,254fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 204,252fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Commercial Real Estate [Member] | Special Mention [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 13,696fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 13,217fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Commercial Real Estate [Member] | Substandard [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 14,850fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 16,004fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Commercial Real Estate [Member] | Doubtful [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 0fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember		 0fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember
Commercial Real Estate [Member] | Loss [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 0fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= fncb_LossMember		 0fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= fncb_LossMember
Construction Land Acquisition and Development [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 21,790fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_ConstructionLandAcquisitionAndDevelopmentMember		 18,835fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_ConstructionLandAcquisitionAndDevelopmentMember
Construction Land Acquisition and Development [Member] | Subtotal Commercial Loans [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 21,020fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_ConstructionLandAcquisitionAndDevelopmentMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_SubtotalCommercialLoansMember		 17,899fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_ConstructionLandAcquisitionAndDevelopmentMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_SubtotalCommercialLoansMember
Construction Land Acquisition and Development [Member] | Accruing Loans [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 770fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_ConstructionLandAcquisitionAndDevelopmentMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_AccruingLoansMember		 936fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_ConstructionLandAcquisitionAndDevelopmentMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_AccruingLoansMember
Construction Land Acquisition and Development [Member] | Non Accruing Loans [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 0fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_ConstructionLandAcquisitionAndDevelopmentMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_NonAccruingLoansMember		 0fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_ConstructionLandAcquisitionAndDevelopmentMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_NonAccruingLoansMember
Construction Land Acquisition and Development [Member] | Subtotal Other Loans [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 770fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_ConstructionLandAcquisitionAndDevelopmentMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_SubtotalOtherLoansMember		 936fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_ConstructionLandAcquisitionAndDevelopmentMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_SubtotalOtherLoansMember
Construction Land Acquisition and Development [Member] | Pass [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 13,982fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_ConstructionLandAcquisitionAndDevelopmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 10,910fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_ConstructionLandAcquisitionAndDevelopmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Construction Land Acquisition and Development [Member] | Special Mention [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 1,476fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_ConstructionLandAcquisitionAndDevelopmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 1,423fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_ConstructionLandAcquisitionAndDevelopmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Construction Land Acquisition and Development [Member] | Substandard [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 5,562fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_ConstructionLandAcquisitionAndDevelopmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 5,566fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_ConstructionLandAcquisitionAndDevelopmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Construction Land Acquisition and Development [Member] | Doubtful [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 0fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_ConstructionLandAcquisitionAndDevelopmentMember
/ us-gaap_InternalCreditAssessmentAxis
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/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_ConstructionLandAcquisitionAndDevelopmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember
Construction Land Acquisition and Development [Member] | Loss [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 0fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_ConstructionLandAcquisitionAndDevelopmentMember
/ us-gaap_InternalCreditAssessmentAxis
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/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_ConstructionLandAcquisitionAndDevelopmentMember
/ us-gaap_InternalCreditAssessmentAxis
= fncb_LossMember
Commercial and Industrial [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 131,895fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_CommercialAndIndustrialLoanMember		 132,057fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_CommercialAndIndustrialLoanMember
Commercial and Industrial [Member] | Subtotal Commercial Loans [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 126,825fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_CommercialAndIndustrialLoanMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_SubtotalCommercialLoansMember		 126,620fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_CommercialAndIndustrialLoanMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_SubtotalCommercialLoansMember
Commercial and Industrial [Member] | Accruing Loans [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 5,036fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_CommercialAndIndustrialLoanMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_AccruingLoansMember		 5,437fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_CommercialAndIndustrialLoanMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_AccruingLoansMember
Commercial and Industrial [Member] | Non Accruing Loans [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 34fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_CommercialAndIndustrialLoanMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
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/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_CommercialAndIndustrialLoanMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_NonAccruingLoansMember
Commercial and Industrial [Member] | Subtotal Other Loans [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 5,070fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_CommercialAndIndustrialLoanMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
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/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_CommercialAndIndustrialLoanMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_SubtotalOtherLoansMember
Commercial and Industrial [Member] | Pass [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 122,514fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_CommercialAndIndustrialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
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/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_CommercialAndIndustrialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Commercial and Industrial [Member] | Special Mention [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 2,265fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_CommercialAndIndustrialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
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/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_CommercialAndIndustrialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Commercial and Industrial [Member] | Substandard [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 2,046fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_CommercialAndIndustrialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
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/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_CommercialAndIndustrialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Commercial and Industrial [Member] | Doubtful [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 0fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_CommercialAndIndustrialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
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/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_CommercialAndIndustrialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember
Commercial and Industrial [Member] | Loss [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 0fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_CommercialAndIndustrialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
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/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fncb_CommercialAndIndustrialLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= fncb_LossMember
State and Political Subdivisions [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 42,206fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 40,205fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
State and Political Subdivisions [Member] | Subtotal Commercial Loans [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 42,206fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
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/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
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/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_SubtotalCommercialLoansMember
State and Political Subdivisions [Member] | Accruing Loans [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 0fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
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/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_AccruingLoansMember
State and Political Subdivisions [Member] | Non Accruing Loans [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 0fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
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/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_NonAccruingLoansMember
State and Political Subdivisions [Member] | Subtotal Other Loans [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 0fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
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= us-gaap_USStatesAndPoliticalSubdivisionsMember
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_SubtotalOtherLoansMember
State and Political Subdivisions [Member] | Pass [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 40,603fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
/ us-gaap_InternalCreditAssessmentAxis
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/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
State and Political Subdivisions [Member] | Special Mention [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 1,041fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
/ us-gaap_InternalCreditAssessmentAxis
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= us-gaap_USStatesAndPoliticalSubdivisionsMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
State and Political Subdivisions [Member] | Substandard [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 562fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
/ us-gaap_InternalCreditAssessmentAxis
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= us-gaap_USStatesAndPoliticalSubdivisionsMember
/ us-gaap_InternalCreditAssessmentAxis
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State and Political Subdivisions [Member] | Doubtful [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment 0fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
/ us-gaap_InternalCreditAssessmentAxis
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= us-gaap_USStatesAndPoliticalSubdivisionsMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember
State and Political Subdivisions [Member] | Loss [Member]    
Internal risk rating system    
Financing Receivable Recorded Investment $ 0fncb_FinancingReceivableRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
/ us-gaap_InternalCreditAssessmentAxis
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/ us-gaap_InternalCreditAssessmentAxis
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