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Regulatory Matters (Details Textual) (USD $)
12 Months Ended
Dec. 31, 2014
Mar. 31, 2015
Regulatory Matters    
Capital Distributions Received From Bank $ 1,000,000fncb_CapitalDistributionsReceivedFromBank  
Interest Expense, Trust Preferred Securities 921,000us-gaap_InterestExpenseTrustPreferredSecurities  
January 2016 [Member]    
Regulatory Matters    
Excess Capital to Risk Weighted Assets   0.625%us-gaap_ExcessCapitalToRiskWeightedAssets
/ fncb_PeriodAxis
= fncb_January2016Member
January 2019 [Member]    
Regulatory Matters    
Excess Capital to Risk Weighted Assets   2.50%us-gaap_ExcessCapitalToRiskWeightedAssets
/ fncb_PeriodAxis
= fncb_January2019Member
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
Capital Required for Capital Adequacy to Risk Weighted Assets   10.50%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ fncb_CapitalRequirementsAxis
= fncb_CapitalConservationBufferMember
New Minimum Capital Capital Level Requirements [Member]    
Regulatory Matters    
Capital to Risk Weighted Assets   8.00%us-gaap_CapitalToRiskWeightedAssets
/ fncb_CapitalRequirementsAxis
= fncb_NewMinimumCapitalCapitalLevelRequirementsMember
Tier One Leverage Capital to Average Assets   4.00%us-gaap_TierOneLeverageCapitalToAverageAssets
/ fncb_CapitalRequirementsAxis
= fncb_NewMinimumCapitalCapitalLevelRequirementsMember
Tier One Risk Based Capital to Risk Weighted Assets   4.50%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ fncb_CapitalRequirementsAxis
= fncb_NewMinimumCapitalCapitalLevelRequirementsMember
Well Capitalized [Member]    
Regulatory Matters    
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets   6.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ fncb_CapitalRequirementsAxis
= fncb_WellCapitalizedMember
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets   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
Tier One Leverage Capital Required to be Well Capitalized to Average Assets   5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ fncb_CapitalRequirementsAxis
= fncb_WellCapitalizedMember
Minimum | New Minimum Capital Capital Level Requirements [Member]    
Regulatory Matters    
Tier One Risk Based Capital to Risk Weighted Assets   4.00%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ fncb_CapitalRequirementsAxis
= fncb_NewMinimumCapitalCapitalLevelRequirementsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
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
Maximum | New Minimum Capital Capital Level Requirements [Member]    
Regulatory Matters    
Tier One Risk Based Capital to Risk Weighted Assets   6.00%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ fncb_CapitalRequirementsAxis
= fncb_NewMinimumCapitalCapitalLevelRequirementsMember
/ 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
Federal Reserve Agreement [Member]    
Regulatory Matters    
Proceeds from Dividends Received 1,000,000us-gaap_ProceedsFromDividendsReceived
/ us-gaap_StatementScenarioAxis
= fncb_FederalReserveAgreementMember
 
Interest Expense, Trust Preferred Securities $ 921,000us-gaap_InterestExpenseTrustPreferredSecurities
/ us-gaap_StatementScenarioAxis
= fncb_FederalReserveAgreementMember