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Loans - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended 3 Months Ended
Mar. 31, 2015
Loans
Dec. 31, 2014
Loans
Mar. 31, 2014
Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Net unamortized loan costs and fees $ 219,000us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums $ 483,000us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums  
Percentage of comprised loan, commercial, industrial and agricultural loans 32.00%ccne_PercentageOfCommercialIndustrialAndAgriculturalLoansInLoanPortfolio 32.00%ccne_PercentageOfCommercialIndustrialAndAgriculturalLoansInLoanPortfolio  
Percentage of comprised loan, commercial mortgage loans 26.00%ccne_PercentageOfCommercialMortgageLoansInLoanPortfolio    
Risk rating to commercial loans 250,000,000ccne_MinimumRiskRatingCategoryOfCommercialLoans    
Percentage of loan-to-value to business equipment 80.00%ccne_CommercialIndustrialAndAgriculturalLoanAmountAsMaximumPercentageOfBusinessEquipment    
Percentage of loan-to-value to accounts receivable 75.00%ccne_CommercialIndustrialAndAgriculturalLoanAmountAsMaximumPercentageOfAccountsReceivable    
Percentage of loan-to-value to business inventory 60.00%ccne_CommercialIndustrialAndAgriculturalLoanAmountAsMaximumPercentageOfBusinessInventory    
Percentage of loan-to-value to real estate 85.00%ccne_CommercialMortgageLoanAmountAsMaximumPercentageOfAppraisedRealEstateValue    
Percentage of residential real estate loan in portfolio 37.00%ccne_PercentageOfResidentialRealEstateLoansInLoanPortfolio 37.00%ccne_PercentageOfResidentialRealEstateLoansInLoanPortfolio  
Number of Loans 15us-gaap_FinancingReceivableModificationsNumberOfContracts2 15us-gaap_FinancingReceivableModificationsNumberOfContracts2  
Minimum period to be considered for loan to have defaulted 90 days    
Principal balances forgiven in connection with loan restructuring $ 0ccne_TroubledDebtRestructuringLoanPrincipalBalanceForgiven $ 0ccne_TroubledDebtRestructuringLoanPrincipalBalanceForgiven  
Outstanding balance of semi annual loans Greater than $1 million    
Outstanding balance of annual loans Less than $1 million    
Trouble Debt Restructuring [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of Loans 0us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_TroubledDebtRestructuringDebtorSubsequentPeriodsAxis
= ccne_TroubleDebtRestructuringMember		   0us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_TroubledDebtRestructuringDebtorSubsequentPeriodsAxis
= ccne_TroubleDebtRestructuringMember
Maximum [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Maximum percentage of consumer loan and credit card in portfolio 10.00%ccne_PercentageOfConsumerLoansAndCreditCardProductsInLoanPortfolio
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 10.00%ccne_PercentageOfConsumerLoansAndCreditCardProductsInLoanPortfolio
/ us-gaap_RangeAxis
= us-gaap_MaximumMember