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Interest Rate Swaps - Additional Information (Detail) (USD $)
 0 Months Ended 12 Months Ended
May 03, 2011
Aug. 01, 2008
Dec. 31, 2014
Dec. 31, 2013
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items]        
Term of interest rate swap agreement executed 5 years 5 years    
Interest rate swap inception date May 03, 2011 Aug. 01, 2008    
Value of subordinated note hedged $ 10,000,000us-gaap_DerivativeCostOfHedge $ 10,000,000us-gaap_DerivativeCostOfHedge    
Interest rate swap effective date Sep. 15, 2013 Sep. 15, 2008    
Interest rate The interest rate swap involves the receipt of variable-rate amounts in exchange for fixed-rate payments from September 15, 2013 to September 15, 2018 without exchange of the underlying notional amount. The interest rate swap involved the receipt of variable-rate amounts in exchange for fixed-rate payments from September 15, 2008 to the September 15, 2013 maturity date without exchange of the underlying notional amount.    
Interest rate swap maturity date   Sep. 15, 2013    
Derivatives designated as fair value hedges     0us-gaap_FairValueHedgesAtFairValueNet 0us-gaap_FairValueHedgesAtFairValueNet
Accumulated other comprehensive loss estimated     378,000ccne_AccumulatedOtherComprehensiveIncomeLossEstimatedReclassificationAdjustmentOnDerivativesIncludedInNetIncomeInNextTwelveMonths  
Collateral amount for counterparty interest rate swap     $ 1,400,000us-gaap_DerivativeCollateralRightToReclaimCash $ 1,400,000us-gaap_DerivativeCollateralRightToReclaimCash
LIBOR Plus 155 Basis Points [Member]        
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items]        
Variable rate on the subordinated debt on effective date in case of interest rate swap     LIBOR plus 155 basis points  
Variable interest rate on subordinate debt     1.79%us-gaap_SubordinatedBorrowingInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= ccne_LiborPlusOneHundredAndFiftyFiveBasisPointsMember		  
4.02% Fixed Rate Plus 155 Basis Points [Member]        
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items]        
Variable rate on the subordinated debt on effective date in case of interest rate swap     4.02% fixed rate plus 155 basis points  
Interest rate being paid by the corporation     5.57%us-gaap_DerivativeAverageVariableInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= ccne_FourPointZeroTwoPercentageFixedRatePlusOneHundredAndFiftyFiveBasisPointsMember		  
Interest Rate Swaps [Member]        
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items]        
Derivative basis spread on variable rate     1.55%us-gaap_DerivativeBasisSpreadOnVariableRate
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		  
Derivative fixed interest rate rate basis     4.02%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember