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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 Segment | Dec. 31, 2013 | Dec. 31, 2012
Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of reportable operating segment | 1 us-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 | $ 1,455,000 us-gaap_AdvertisingExpense | $ 939,000 us-gaap_AdvertisingExpense | $ 859,000 us-gaap_AdvertisingExpense
Number of nonqualified options or restricted stock for key employees and independent director | 500,000 ccne_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 | 0 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions | 0 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions |
Stock options, granted | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross |
Shares granted, restricted common stock | 35,400 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod | 31,500 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod | 26,900 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Compensation expense restricted stock awards | 548,000 us-gaap_RestrictedStockExpense | 390,000 us-gaap_RestrictedStockExpense | 277,000 us-gaap_RestrictedStockExpense
Average amount of non interest bearing reserve with federal reserve bank | $ 50,000 ccne_AverageAmountOfNonInterestBearingReserveWithFederalReserveBank | $ 50,000 ccne_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 |  |

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