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Loans - Additional Information (Detail) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 Loans | Dec. 31, 2013 Loans | Dec. 31, 2012 Loans | Jan. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Net unamortized loan costs and fees | $ 483,000 us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums | $ 911,000 us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums |  |
Percentage of comprised loan, commercial, industrial and agricultural loans | 32.00%ccne_PercentageOfCommercialIndustrialAndAgriculturalLoansInLoanPortfolio | 33.00%ccne_PercentageOfCommercialIndustrialAndAgriculturalLoansInLoanPortfolio |  |
Percentage of comprised loan, commercial mortgage loans | 26.00%ccne_PercentageOfCommercialMortgageLoansInLoanPortfolio | 26.00%ccne_PercentageOfCommercialMortgageLoansInLoanPortfolio |  |
Risk rating to commercial loans | 250,000,000 ccne_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 | 35.00%ccne_PercentageOfResidentialRealEstateLoansInLoanPortfolio |  |
Additional provision for loan losses | 319,000 us-gaap_AllowanceForLoanAndLeaseLossesPeriodIncreaseDecrease | 514,000 us-gaap_AllowanceForLoanAndLeaseLossesPeriodIncreaseDecrease |  |
Minimum period to be considered for loan to have defaulted | 90 days |  |  |
Principal balances forgiven in connection with loan restructuring | 0 ccne_TroubledDebtRestructuringLoanPrincipalBalanceForgiven | 0 ccne_TroubledDebtRestructuringLoanPrincipalBalanceForgiven |  |
Number of Loans | 16 us-gaap_FinancingReceivableModificationsNumberOfContracts2 | 12 us-gaap_FinancingReceivableModificationsNumberOfContracts2 |  |
Loans modified in a troubled debt restructuring | 18,658,000 us-gaap_FinancingReceivableModificationsRecordedInvestment | 12,136,000 us-gaap_FinancingReceivableModificationsRecordedInvestment |  |
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 | 4 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_TroubledDebtRestructuringDebtorSubsequentPeriodsAxis = ccne_TroubleDebtRestructuringMember | 3 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_TroubledDebtRestructuringDebtorSubsequentPeriodsAxis = ccne_TroubleDebtRestructuringMember | 7 us-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 |  |
Reduction in stated interest rate modification having loan range period |  |  |  | 15 years
Extension of maturity date modification having loan range period |  |  |  | 18 years
Minimum [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Reduction in stated interest rate modification having loan range period |  |  |  | 4 years
Extension of maturity date modification having loan range period |  |  |  | 4 years
Commercial Mortgage Loan One [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Additional provision for loan losses |  | 262,000 ccne_AdditionalProvisionForLoanLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ccne_CommercialMortgageLoanOneMember |  |
Troubled debt restructuring charged off |  | 974,000 us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ccne_CommercialMortgageLoanOneMember |  |
Commercial mortgage loan balance amount |  | 1,086,000 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ccne_CommercialMortgageLoanOneMember | 1,660,000 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ccne_CommercialMortgageLoanOneMember |
Commercial Mortgage Loan Two [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Additional provision for loan losses |  | 615,000 ccne_AdditionalProvisionForLoanLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ccne_CommercialMortgageLoanTwoMember |  |
Commercial Mortgage Loan Three [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans modified in a troubled debt restructuring |  | 3,269,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ccne_CommercialMortgageLoanThreeMember |  |
Additional provision for loan losses |  | 514,000 ccne_AdditionalProvisionForLoanLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ccne_CommercialMortgageLoanThreeMember |  |
Commercial, Industrial, and Agricultural [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan portfolio segment reclassification | 136,000,000 ccne_LoansSegmentReclassificationAdjustments / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ccne_CommercialIndustrialAndAgriculturalMember |  |  |
Loans modified in a troubled debt restructuring | 3,920,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ccne_CommercialIndustrialAndAgriculturalMember | 1,790,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ccne_CommercialIndustrialAndAgriculturalMember |  |
Commercial, Industrial, and Agricultural [Member] | Special Mention [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Increase (Decrease) in loans after reclassification | 3,000,000 us-gaap_IncreaseDecreaseInLoansHeldForSale / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ccne_CommercialIndustrialAndAgriculturalMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember |  |  |
Commercial, Industrial, and Agricultural [Member] | Substandard [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Increase (Decrease) in loans after reclassification | 10,600,000 us-gaap_IncreaseDecreaseInLoansHeldForSale / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ccne_CommercialIndustrialAndAgriculturalMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember |  |  |
Commercial, Industrial, and Agricultural [Member] | Trouble Debt Restructuring [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans modified in a troubled debt restructuring | 2,315,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ccne_CommercialIndustrialAndAgriculturalMember / us-gaap_TroubledDebtRestructuringDebtorSubsequentPeriodsAxis = ccne_TroubleDebtRestructuringMember |  |  |
Additional provision for loan losses | 48,000 ccne_AdditionalProvisionForLoanLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ccne_CommercialIndustrialAndAgriculturalMember / us-gaap_TroubledDebtRestructuringDebtorSubsequentPeriodsAxis = ccne_TroubleDebtRestructuringMember |  |  |
Commercial Mortgages [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan portfolio segment reclassification | 124,000,000 ccne_LoansSegmentReclassificationAdjustments / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ccne_CommercialMortgagesMember |  |  |
Loans modified in a troubled debt restructuring | 14,738,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ccne_CommercialMortgagesMember | 10,346,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ccne_CommercialMortgagesMember |  |
Commercial Mortgages [Member] | Trouble Debt Restructuring [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of Loans | 3 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ccne_CommercialMortgagesMember / us-gaap_TroubledDebtRestructuringDebtorSubsequentPeriodsAxis = ccne_TroubleDebtRestructuringMember |  |  |
Loans modified in a troubled debt restructuring | 4,879,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ccne_CommercialMortgagesMember / us-gaap_TroubledDebtRestructuringDebtorSubsequentPeriodsAxis = ccne_TroubleDebtRestructuringMember |  |  |
Additional provision for loan losses | 271,000 ccne_AdditionalProvisionForLoanLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ccne_CommercialMortgagesMember / us-gaap_TroubledDebtRestructuringDebtorSubsequentPeriodsAxis = ccne_TroubleDebtRestructuringMember |  |  |
Residential Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan portfolio segment reclassification | 12,000,000 ccne_LoansSegmentReclassificationAdjustments / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember |  |  |
Loans modified in a troubled debt restructuring | $ 0 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember | $ 0 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialRealEstateMember |  |

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