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Other Real Estate Owned (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Other Real Estate Owned Properties [Line Items]    
Foreclosed Real Estate Expense $ 100us-gaap_ForeclosedRealEstateExpense $ 163us-gaap_ForeclosedRealEstateExpense
Real Estates Insurance [Member]    
Other Real Estate Owned Properties [Line Items]    
Foreclosed Real Estate Expense 14us-gaap_ForeclosedRealEstateExpense
/ fncb_ComponentsOfOtherIncomeNonoperatingAxis
= fncb_RealEstatesInsuranceMember
27us-gaap_ForeclosedRealEstateExpense
/ fncb_ComponentsOfOtherIncomeNonoperatingAxis
= fncb_RealEstatesInsuranceMember
Real Estates Legal Fees [Member]    
Other Real Estate Owned Properties [Line Items]    
Foreclosed Real Estate Expense 20us-gaap_ForeclosedRealEstateExpense
/ fncb_ComponentsOfOtherIncomeNonoperatingAxis
= fncb_RealEstatesLegalFeesMember
9us-gaap_ForeclosedRealEstateExpense
/ fncb_ComponentsOfOtherIncomeNonoperatingAxis
= fncb_RealEstatesLegalFeesMember
Real Estates Maintenance [Member]    
Other Real Estate Owned Properties [Line Items]    
Foreclosed Real Estate Expense 0us-gaap_ForeclosedRealEstateExpense
/ fncb_ComponentsOfOtherIncomeNonoperatingAxis
= fncb_RealEstatesMaintenanceMember
10us-gaap_ForeclosedRealEstateExpense
/ fncb_ComponentsOfOtherIncomeNonoperatingAxis
= fncb_RealEstatesMaintenanceMember
Professional Fees [Member]    
Other Real Estate Owned Properties [Line Items]    
Foreclosed Real Estate Expense 0us-gaap_ForeclosedRealEstateExpense
/ fncb_ComponentsOfOtherIncomeNonoperatingAxis
= fncb_ProfessionalFeeMember
10us-gaap_ForeclosedRealEstateExpense
/ fncb_ComponentsOfOtherIncomeNonoperatingAxis
= fncb_ProfessionalFeeMember
Real Estate Taxes [Member]    
Other Real Estate Owned Properties [Line Items]    
Foreclosed Real Estate Expense 26us-gaap_ForeclosedRealEstateExpense
/ fncb_ComponentsOfOtherIncomeNonoperatingAxis
= fncb_RealEstatesTaxesMember
49us-gaap_ForeclosedRealEstateExpense
/ fncb_ComponentsOfOtherIncomeNonoperatingAxis
= fncb_RealEstatesTaxesMember
Real Estates Utilities [Member]    
Other Real Estate Owned Properties [Line Items]    
Foreclosed Real Estate Expense 10us-gaap_ForeclosedRealEstateExpense
/ fncb_ComponentsOfOtherIncomeNonoperatingAxis
= fncb_RealEstatesUtilitiesMember
3us-gaap_ForeclosedRealEstateExpense
/ fncb_ComponentsOfOtherIncomeNonoperatingAxis
= fncb_RealEstatesUtilitiesMember
Real Estates Other [Member]    
Other Real Estate Owned Properties [Line Items]    
Foreclosed Real Estate Expense 18us-gaap_ForeclosedRealEstateExpense
/ fncb_ComponentsOfOtherIncomeNonoperatingAxis
= fncb_RealEstatesOtherMember
5us-gaap_ForeclosedRealEstateExpense
/ fncb_ComponentsOfOtherIncomeNonoperatingAxis
= fncb_RealEstatesOtherMember
Real Estates Valuation Adjustments [Member]    
Other Real Estate Owned Properties [Line Items]    
Foreclosed Real Estate Expense 12us-gaap_ForeclosedRealEstateExpense
/ fncb_ComponentsOfOtherIncomeNonoperatingAxis
= fncb_RealEstatesValuationAdjustmentsMember
53us-gaap_ForeclosedRealEstateExpense
/ fncb_ComponentsOfOtherIncomeNonoperatingAxis
= fncb_RealEstatesValuationAdjustmentsMember
Real Estates Total expense [Member]    
Other Real Estate Owned Properties [Line Items]    
Foreclosed Real Estate Expense 100us-gaap_ForeclosedRealEstateExpense
/ fncb_ComponentsOfOtherIncomeNonoperatingAxis
= fncb_RealEstatesTotalExpenseMember
166us-gaap_ForeclosedRealEstateExpense
/ fncb_ComponentsOfOtherIncomeNonoperatingAxis
= fncb_RealEstatesTotalExpenseMember
Real Estates Income Loss from Operation of Foreclosed Properties [Member]    
Other Real Estate Owned Properties [Line Items]    
Foreclosed Real Estate Expense $ 0us-gaap_ForeclosedRealEstateExpense
/ fncb_ComponentsOfOtherIncomeNonoperatingAxis
= fncb_RealEstatesIncomeLossFromOperationOfForeclosedPropertiesMember
$ (3)us-gaap_ForeclosedRealEstateExpense
/ fncb_ComponentsOfOtherIncomeNonoperatingAxis
= fncb_RealEstatesIncomeLossFromOperationOfForeclosedPropertiesMember