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Income Taxes - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition [Line Items]    
Unrecognized tax benefit $ 0us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate $ 0us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Income tax matters accrued interest or penalties 0us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued 0us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued
Income tax examination, open tax year description Tax years 2011 through 2013 remain open to federal and state examination.  
Net operating loss carryforward, amount 4,703,000us-gaap_OperatingLossCarryforwards  
Farmers Citizens Bank [Member]    
Business Acquisition [Line Items]    
Net operating loss carryforward, amount $ 6,367,000us-gaap_OperatingLossCarryforwards
/ us-gaap_BusinessAcquisitionAxis
= ccne_FarmersCitizensBankMember		  
Net operating loss carryforward, expiration year 2033