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LOANS (Details Textual) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Financing Receivable, Modifications [Line Items]      
Period Past Due For Classification Of Loans To Non Accrual Status 90 days 90 days  
Financing Receivable Amount Of Loans With Amount Outstanding Balance $ 9,400,000fncb_FinancingReceivableAmountOfLoansWithAmountOutstandingBalance   $ 9,000,000fncb_FinancingReceivableAmountOfLoansWithAmountOutstandingBalance
Financing Receivable, Recorded Investment, Nonaccrual Status 5,200,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus   5,500,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Loans Receivable Held-for-sale, Net 0us-gaap_LoansReceivableHeldForSaleNet   603,000us-gaap_LoansReceivableHeldForSaleNet
Financing Receivable Amount Of Nonaccrual Troubled Debt Restructuring Loans With Specified Minimum Amount Of Outstanding Balance 100,000fncb_FinancingReceivableAmountOfNonaccrualTroubledDebtRestructuringLoansWithSpecifiedMinimumAmountOfOutstandingBalance    
Financing Receivable Specific Reserve for Troubled Debt Restructurings 417,000fncb_FinancingReceivableSpecificReserveForTroubledDebtRestructurings   346,000fncb_FinancingReceivableSpecificReserveForTroubledDebtRestructurings
Financing Receivable Amount Of Nonaccrual Loans With Specified Minimum Amount Of Outstanding Balance Evaluated collectively 1,000,000fncb_FinancingReceivableAmountOfNonaccrualLoansWithSpecifiedMinimumAmountOfOutstandingBalanceEvaluatedCollectively   1,000,000fncb_FinancingReceivableAmountOfNonaccrualLoansWithSpecifiedMinimumAmountOfOutstandingBalanceEvaluatedCollectively
Impaired Financing Receivable, Recorded Investment, Total 9,989,000us-gaap_ImpairedFinancingReceivableRecordedInvestment   9,796,000us-gaap_ImpairedFinancingReceivableRecordedInvestment
Loss on Sale of Other Loans and Leases   13,000us-gaap_GainLossOnSaleOfOtherLoansAndLeases  
Troubled Debt Restructuring Increase In Allowances For Loan Losses 94,000fncb_TroubledDebtRestructuringIncreaseInAllowancesForLoanlosses 1,000fncb_TroubledDebtRestructuringIncreaseInAllowancesForLoanlosses  
Education Loans Recorded Investment   2,600,000fncb_EducationLoansRecordedInvestment  
Additional Income Earned On Nonaccrual And Restructuring Loans 91,000fncb_AdditionalIncomeEarnedOnNonaccrualAndRestructuringLoans 103,000fncb_AdditionalIncomeEarnedOnNonaccrualAndRestructuringLoans  
Impaired Financing Receivable, Related Allowance 417,000us-gaap_ImpairedFinancingReceivableRelatedAllowance   384,000us-gaap_ImpairedFinancingReceivableRelatedAllowance
Provision for Loan and Lease Losses (494,000)us-gaap_ProvisionForLoanAndLeaseLosses (1,570,000)us-gaap_ProvisionForLoanAndLeaseLosses  
Unallocated Financing Receivables [Member]      
Financing Receivable, Modifications [Line Items]      
Provision for Loan and Lease Losses 39,000us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_UnallocatedFinancingReceivablesMember		   45,000us-gaap_ProvisionForLoanAndLeaseLosses
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_UnallocatedFinancingReceivablesMember
Accruing Loans [Member]      
Financing Receivable, Modifications [Line Items]      
Additional Income Earned On Nonaccrual And Restructuring Loans 5,800,000fncb_AdditionalIncomeEarnedOnNonaccrualAndRestructuringLoans
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_AccruingLoansMember		   5,300,000fncb_AdditionalIncomeEarnedOnNonaccrualAndRestructuringLoans
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_AccruingLoansMember
Non Accruing Loans [Member]      
Financing Receivable, Modifications [Line Items]      
Financing Receivable Amount Of Nonaccrual Troubled Debt Restructuring Loans With Specified Minimum Amount Of Outstanding Balance 100,000fncb_FinancingReceivableAmountOfNonaccrualTroubledDebtRestructuringLoansWithSpecifiedMinimumAmountOfOutstandingBalance
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_NonAccruingLoansMember		    
Financing Receivable Amount Of Nonaccrual Loans With Specified Minimum Amount Of Outstanding Balance Evaluated collectively 100,000fncb_FinancingReceivableAmountOfNonaccrualLoansWithSpecifiedMinimumAmountOfOutstandingBalanceEvaluatedCollectively
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_NonAccruingLoansMember		    
Additional Income Earned On Nonaccrual And Restructuring Loans 3,600,000fncb_AdditionalIncomeEarnedOnNonaccrualAndRestructuringLoans
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_NonAccruingLoansMember		   3,700,000fncb_AdditionalIncomeEarnedOnNonaccrualAndRestructuringLoans
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_NonAccruingLoansMember
One To Four Family Mortgages [Member]      
Financing Receivable, Modifications [Line Items]      
Recorded Investment of Mortgage Loans Sold $ 1,000,000fncb_RecordedInvestmentOfMortgageLoansSold
/ fncb_FinancingReceivableByTypeOfValuationAxis
= fncb_OneToFourFamilyMortgagesMember