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Borrowings - Additional Information (Detail) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2007
Security
Mar. 31, 2007
Dec. 31, 2014
Dec. 31, 2013
Borrowings Under Repurchase Agreements [Line items]        
Line of credit facility, maximum borrowing capacity     $ 10,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity $ 10,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Line of credit, outstanding amount     0us-gaap_LineOfCredit 0us-gaap_LineOfCredit
FHLB borrowings, available capacity     443,789,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAmountOfAvailableUnusedFunds  
FHLB borrowings, pledge of selected securities, loan covered amount     47,031,000ccne_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresSecuritiesPledgedLoanCoveredAmount  
FHLB borrowings, pledge on certain loans, loan covered amount     692,896,000ccne_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCertainLoansPledgedLoanCoveredAmount  
Borrowings from unaffiliated entities, interest rate     5.25%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateAtPeriodEnd 5.25%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateAtPeriodEnd
Issuance of preferred securities 2,000ccne_IssuanceOfFloatingRateTrustPreferredSecurities      
Unaffiliated institution 1 [Member]        
Borrowings Under Repurchase Agreements [Line items]        
Borrowings from unaffiliated entities, interest rate       0.35%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateAtPeriodEnd
/ us-gaap_LineOfCreditFacilityAxis
= ccne_UnaffiliatedInstitutionOneMember
Unaffiliated Institution [Member]        
Borrowings Under Repurchase Agreements [Line items]        
Borrowings from unaffiliated entities, transaction amount   10,000,000us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt
/ us-gaap_LineOfCreditFacilityAxis
= ccne_UnaffiliatedInstitutionMember		    
Borrowings securities pledged under certain transaction     11,669,000us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesForOtherDebtFacilities
/ us-gaap_LineOfCreditFacilityAxis
= ccne_UnaffiliatedInstitutionMember		  
Borrowing maturity date     Mar. 20, 2017  
Over Night Borrowings [Member] | Unaffiliated institution 1 [Member]        
Borrowings Under Repurchase Agreements [Line items]        
Borrowings under US treasury       12,950,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_LineOfCreditFacilityAxis
= ccne_UnaffiliatedInstitutionOneMember
/ us-gaap_LongtermDebtTypeAxis
= ccne_OverNightBorrowingsMember
Subordinated Debentures [Member]        
Borrowings Under Repurchase Agreements [Line items]        
Issue of floating rate trust preferred securities 10,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleSubordinatedDebtMember		      
Trust preferred securities, interest payment deferment period maximum     5 years  
Borrowings, floating interest rate description     Floats based on the 3 month LIBOR plus 1.55% and was 1.79% at both December 31, 2014 and 2013.  
Line of credit, basis spread on LIBOR     1.55%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleSubordinatedDebtMember		  
Trust preferred securities, period end interest rate     1.79%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleSubordinatedDebtMember		 1.79%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleSubordinatedDebtMember
Trust preferred securities, redemption year maximum     2037