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REGULATORY MATTERS (Details Textual) (USD $)
0 Months Ended 12 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended
Dec. 15, 2014
Dec. 31, 2014
Dec. 31, 2014
Dec. 08, 2014
Sep. 08, 2014
Oct. 31, 2010
Dec. 31, 2013
Nov. 30, 2010
Regulatory Matters                
Capital to Risk Weighted Assets   13.67%us-gaap_CapitalToRiskWeightedAssets 13.67%us-gaap_CapitalToRiskWeightedAssets       11.58%us-gaap_CapitalToRiskWeightedAssets  
Tier One Leverage Capital to Average Assets   6.05%us-gaap_TierOneLeverageCapitalToAverageAssets 6.05%us-gaap_TierOneLeverageCapitalToAverageAssets       4.71%us-gaap_TierOneLeverageCapitalToAverageAssets  
Capital Distributions Received From Bank $ 1,000,000fncb_CapitalDistributionsReceivedFromBank              
Payment Of Deferred And Currently Payable Accrued Interest 921,000fncb_PaymentOfDeferredAndCurrentlyPayableAccruedInterest              
Tier One Risk Based Capital to Risk Weighted Assets   8.76%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets 8.76%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets       6.88%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets  
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets   4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets       4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets  
Capital Required for Capital Adequacy to Risk Weighted Assets   8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets       8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets  
Excess Capital to Risk Weighted Assets   0.625%us-gaap_ExcessCapitalToRiskWeightedAssets 0.625%us-gaap_ExcessCapitalToRiskWeightedAssets          
Capital plan [Member]                
Regulatory Matters                
Capital to Risk Weighted Assets   15.42%us-gaap_CapitalToRiskWeightedAssets
/ fncb_PlanAxis
= fncb_CapitalPlanMember
15.42%us-gaap_CapitalToRiskWeightedAssets
/ fncb_PlanAxis
= fncb_CapitalPlanMember
         
Tier One Leverage Capital to Average Assets   9.00%us-gaap_TierOneLeverageCapitalToAverageAssets
/ fncb_PlanAxis
= fncb_CapitalPlanMember
9.00%us-gaap_TierOneLeverageCapitalToAverageAssets
/ fncb_PlanAxis
= fncb_CapitalPlanMember
         
Minimum Capital Level Requirements [Member]                
Regulatory Matters                
Capital to Risk Weighted Assets   8.00%us-gaap_CapitalToRiskWeightedAssets
/ fncb_CapitalRequirementsAxis
= fncb_MinimumCapitalLevelRequirementsMember
8.00%us-gaap_CapitalToRiskWeightedAssets
/ fncb_CapitalRequirementsAxis
= fncb_MinimumCapitalLevelRequirementsMember
         
Tier One Leverage Capital to Average Assets   4.00%us-gaap_TierOneLeverageCapitalToAverageAssets
/ fncb_CapitalRequirementsAxis
= fncb_MinimumCapitalLevelRequirementsMember
4.00%us-gaap_TierOneLeverageCapitalToAverageAssets
/ fncb_CapitalRequirementsAxis
= fncb_MinimumCapitalLevelRequirementsMember
         
Tier One Risk Based Capital to Risk Weighted Assets   4.50%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ fncb_CapitalRequirementsAxis
= fncb_MinimumCapitalLevelRequirementsMember
4.50%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ fncb_CapitalRequirementsAxis
= fncb_MinimumCapitalLevelRequirementsMember
         
Minimum capital Requirement as per Capital Conservation Buffer   2.50%fncb_MinimumCapitalRequirementAsPerCapitalConservationBuffer
/ fncb_CapitalRequirementsAxis
= fncb_MinimumCapitalLevelRequirementsMember
2.50%fncb_MinimumCapitalRequirementAsPerCapitalConservationBuffer
/ fncb_CapitalRequirementsAxis
= fncb_MinimumCapitalLevelRequirementsMember
         
Well Capitalized [Member]                
Regulatory Matters                
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets   6.50%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ fncb_CapitalRequirementsAxis
= fncb_WellCapitalizedMember
6.50%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ fncb_CapitalRequirementsAxis
= fncb_WellCapitalizedMember
         
Capital Required to be Well Capitalized to Risk Weighted Assets   10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ fncb_CapitalRequirementsAxis
= fncb_WellCapitalizedMember
10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ fncb_CapitalRequirementsAxis
= fncb_WellCapitalizedMember
         
Tier One Leverage Capital Required to be Well Capitalized to Average Assets   5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ fncb_CapitalRequirementsAxis
= fncb_WellCapitalizedMember
5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ fncb_CapitalRequirementsAxis
= fncb_WellCapitalizedMember
         
capital conservation buffer [Member]                
Regulatory Matters                
Capital Required for Capital Adequacy to Risk Weighted Assets   10.50%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ fncb_CapitalRequirementsAxis
= fncb_CapitalConservationBufferMember
10.50%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ fncb_CapitalRequirementsAxis
= fncb_CapitalConservationBufferMember
         
Minimum                
Regulatory Matters                
Capital to Risk Weighted Assets   13.00%us-gaap_CapitalToRiskWeightedAssets
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
13.00%us-gaap_CapitalToRiskWeightedAssets
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
         
Minimum | Capital plan [Member]                
Regulatory Matters                
Tier One Leverage Capital to Average Assets   13.00%us-gaap_TierOneLeverageCapitalToAverageAssets
/ fncb_PlanAxis
= fncb_CapitalPlanMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
13.00%us-gaap_TierOneLeverageCapitalToAverageAssets
/ fncb_PlanAxis
= fncb_CapitalPlanMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
         
Minimum | Minimum Capital Level Requirements [Member]                
Regulatory Matters                
Tier One Risk Based Capital to Risk Weighted Assets   4.00%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ fncb_CapitalRequirementsAxis
= fncb_MinimumCapitalLevelRequirementsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
4.00%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ fncb_CapitalRequirementsAxis
= fncb_MinimumCapitalLevelRequirementsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
         
Minimum | Well Capitalized [Member]                
Regulatory Matters                
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets   6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ fncb_CapitalRequirementsAxis
= fncb_WellCapitalizedMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ fncb_CapitalRequirementsAxis
= fncb_WellCapitalizedMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
         
Minimum | capital conservation buffer [Member]                
Regulatory Matters                
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets   7.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ fncb_CapitalRequirementsAxis
= fncb_CapitalConservationBufferMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
7.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ fncb_CapitalRequirementsAxis
= fncb_CapitalConservationBufferMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
         
Maximum | Minimum Capital Level Requirements [Member]                
Regulatory Matters                
Tier One Risk Based Capital to Risk Weighted Assets   6.00%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ fncb_CapitalRequirementsAxis
= fncb_MinimumCapitalLevelRequirementsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
6.00%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ fncb_CapitalRequirementsAxis
= fncb_MinimumCapitalLevelRequirementsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
         
Maximum | Well Capitalized [Member]                
Regulatory Matters                
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets   8.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ fncb_CapitalRequirementsAxis
= fncb_WellCapitalizedMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
8.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ fncb_CapitalRequirementsAxis
= fncb_WellCapitalizedMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
         
Maximum | capital conservation buffer [Member]                
Regulatory Matters                
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets   8.50%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ fncb_CapitalRequirementsAxis
= fncb_CapitalConservationBufferMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
8.50%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ fncb_CapitalRequirementsAxis
= fncb_CapitalConservationBufferMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
         
Subsidiaries [Member]                
Regulatory Matters                
Capital to Risk Weighted Assets   15.42%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
15.42%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
      13.43%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
Tier One Leverage Capital to Average Assets   9.78%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
9.78%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
      8.32%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
Increased Risk based Capital Points   199fncb_IncreasedRiskBasedCapitalPoints
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
           
Increased In Leverage Ratio Points   146fncb_IncreasedInLeverageRatioPoints
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
           
Tier One Risk Based Capital to Risk Weighted Assets   14.16%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
14.16%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
      12.17%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets   4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
      4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
Capital Required for Capital Adequacy to Risk Weighted Assets   8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
      8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets   6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
      6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
Capital Required to be Well Capitalized to Risk Weighted Assets   10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
      10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
Tier One Leverage Capital Required to be Well Capitalized to Average Assets   5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
      5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
Subsidiaries [Member] | Capital plan [Member]                
Regulatory Matters                
Capital to Risk Weighted Assets   9.78%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ fncb_PlanAxis
= fncb_CapitalPlanMember
9.78%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ fncb_PlanAxis
= fncb_CapitalPlanMember
         
Subsidiaries [Member] | Minimum                
Regulatory Matters                
Capital to Risk Weighted Assets               13.00%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Tier One Leverage Capital to Average Assets   9.00%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
9.00%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
        9.00%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Federal Reserve Bank of Philadelphia [Member]                
Regulatory Matters                
Proceeds from Dividends Received     1,000,000us-gaap_ProceedsFromDividendsReceived
/ dei_LegalEntityAxis
= fncb_FederalReserveBankOfPhiladelphiaMember
         
OCC Consent Order [Member]                
Regulatory Matters                
Period from Receipt of Determination of No Supervisory Objection for Definitive Agreement           90 days    
Capital to Risk Weighted Assets           13.00%us-gaap_CapitalToRiskWeightedAssets
/ us-gaap_StatementScenarioAxis
= fncb_OCCConsentOrderMember
   
Tier One Leverage Capital to Average Assets           9.00%us-gaap_TierOneLeverageCapitalToAverageAssets
/ us-gaap_StatementScenarioAxis
= fncb_OCCConsentOrderMember
   
Capital Distributions Received From Bank       1,000,000fncb_CapitalDistributionsReceivedFromBank
/ us-gaap_StatementScenarioAxis
= fncb_OCCConsentOrderMember
1,000,000fncb_CapitalDistributionsReceivedFromBank
/ us-gaap_StatementScenarioAxis
= fncb_OCCConsentOrderMember
     
Interest Expense, Trust Preferred Securities         $ 921,000us-gaap_InterestExpenseTrustPreferredSecurities
/ us-gaap_StatementScenarioAxis
= fncb_OCCConsentOrderMember
     
Federal Reserve Agreement [Member] | Minimum                
Regulatory Matters                
Capital to Risk Weighted Assets   13.00%us-gaap_CapitalToRiskWeightedAssets
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= fncb_FederalReserveAgreementMember
13.00%us-gaap_CapitalToRiskWeightedAssets
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= fncb_FederalReserveAgreementMember
         
Tier One Risk Based Capital to Risk Weighted Assets   9.00%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= fncb_FederalReserveAgreementMember
9.00%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= fncb_FederalReserveAgreementMember