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Interest Rate Swaps - Additional Information (Detail) (USD $) | 0 Months Ended | 12 Months Ended |
--- | --- | --- | ---
May 03, 2011 | Aug. 01, 2008 | Dec. 31, 2014 | Dec. 31, 2013
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |  |  |  |
Term of interest rate swap agreement executed | 5 years | 5 years |  |
Interest rate swap inception date | May 03, 2011 | Aug. 01, 2008 |  |
Value of subordinated note hedged | $ 10,000,000 us-gaap_DerivativeCostOfHedge | $ 10,000,000 us-gaap_DerivativeCostOfHedge |  |
Interest rate swap effective date | Sep. 15, 2013 | Sep. 15, 2008 |  |
Interest rate | The interest rate swap involves the receipt of variable-rate amounts in exchange for fixed-rate payments from September 15, 2013 to September 15, 2018 without exchange of the underlying notional amount. | The interest rate swap involved the receipt of variable-rate amounts in exchange for fixed-rate payments from September 15, 2008 to the September 15, 2013 maturity date without exchange of the underlying notional amount. |  |
Interest rate swap maturity date |  | Sep. 15, 2013 |  |
Derivatives designated as fair value hedges |  |  | 0 us-gaap_FairValueHedgesAtFairValueNet | 0 us-gaap_FairValueHedgesAtFairValueNet
Accumulated other comprehensive loss estimated |  |  | 378,000 ccne_AccumulatedOtherComprehensiveIncomeLossEstimatedReclassificationAdjustmentOnDerivativesIncludedInNetIncomeInNextTwelveMonths |
Collateral amount for counterparty interest rate swap |  |  | $ 1,400,000 us-gaap_DerivativeCollateralRightToReclaimCash | $ 1,400,000 us-gaap_DerivativeCollateralRightToReclaimCash
LIBOR Plus 155 Basis Points [Member] |  |  |  |
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |  |  |  |
Variable rate on the subordinated debt on effective date in case of interest rate swap |  |  | LIBOR plus 155 basis points |
Variable interest rate on subordinate debt |  |  | 1.79%us-gaap_SubordinatedBorrowingInterestRate / us-gaap_DerivativeInstrumentRiskAxis = ccne_LiborPlusOneHundredAndFiftyFiveBasisPointsMember |
4.02% Fixed Rate Plus 155 Basis Points [Member] |  |  |  |
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |  |  |  |
Variable rate on the subordinated debt on effective date in case of interest rate swap |  |  | 4.02% fixed rate plus 155 basis points |
Interest rate being paid by the corporation |  |  | 5.57%us-gaap_DerivativeAverageVariableInterestRate / us-gaap_DerivativeInstrumentRiskAxis = ccne_FourPointZeroTwoPercentageFixedRatePlusOneHundredAndFiftyFiveBasisPointsMember |
Interest Rate Swaps [Member] |  |  |  |
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |  |  |  |
Derivative basis spread on variable rate |  |  | 1.55%us-gaap_DerivativeBasisSpreadOnVariableRate / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |
Derivative fixed interest rate rate basis |  |  | 4.02%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |

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