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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Segment
Dec. 31, 2013
Dec. 31, 2012
Summary Of Significant Accounting Policies [Line Items]      
Number of reportable operating segment 1us-gaap_NumberOfReportableSegments    
Maturity period of Interest bearing deposits in other financial institutions 1 year    
Period of delinquent loan 90 days    
Loss history of portfolio segment determination period 2 years    
Advertising costs $ 1,455,000us-gaap_AdvertisingExpense $ 939,000us-gaap_AdvertisingExpense $ 859,000us-gaap_AdvertisingExpense
Number of nonqualified options or restricted stock for key employees and independent director 500,000ccne_NumberOfNonqualifiedOptionsOrRestrictedStockForKeyEmployeesAndIndependentDirector    
Description of award terms For key employees, the plan vesting schedule is one-fourth of granted stock-based awards per year beginning one year after the grant date with 100% vested on the fourth anniversary. For independent directors, the vesting schedule is one-third of granted stock-based awards per year beginning one year after the grant date with 100% vested on the third anniversary.    
Unrecognized compensation cost related to nonvested stock options granted under this plan 0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions 0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions  
Stock options, granted 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross  
Shares granted, restricted common stock 35,400us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod 31,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod 26,900us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Compensation expense restricted stock awards 548,000us-gaap_RestrictedStockExpense 390,000us-gaap_RestrictedStockExpense 277,000us-gaap_RestrictedStockExpense
Average amount of non interest bearing reserve with federal reserve bank $ 50,000ccne_AverageAmountOfNonInterestBearingReserveWithFederalReserveBank $ 50,000ccne_AverageAmountOfNonInterestBearingReserveWithFederalReserveBank  
Independent Directors [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Starting period of vesting of stock based award 1 year    
Aggregate percentage of stock based awards to be matured 100.00%ccne_AggregatePercentageOfStockBasedAwardsToBeMatured
/ us-gaap_TitleOfIndividualAxis
= ccne_IndependentDirectorsMember		    
Key Employees [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Starting period of vesting of stock based award 1 year    
Aggregate percentage of stock based awards to be matured 100.00%ccne_AggregatePercentageOfStockBasedAwardsToBeMatured
/ us-gaap_TitleOfIndividualAxis
= ccne_KeyEmployeesMember		    
Minimum [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Percentage of tax benefit realized 50.00%ccne_PercentageOfTaxBenefitRealized
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
Maximum [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Period of Consumer loans charged off 180 days    
Premises and Equipment [Member] | Minimum [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Useful lives of premises and equipment 3 years    
Premises and Equipment [Member] | Maximum [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Useful lives of premises and equipment 39 years    
Furniture, Fixtures and Equipment [Member] | Minimum [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Useful lives of premises and equipment 3 years    
Furniture, Fixtures and Equipment [Member] | Maximum [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Useful lives of premises and equipment 10 years    
Buildings and Building Improvements [Member] | Minimum [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Useful lives of premises and equipment 15 years    
Buildings and Building Improvements [Member] | Maximum [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Useful lives of premises and equipment 39 years    
Core Deposit [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Amortization of intangible assets 7 years