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v2.4.1.9

Other Comprehensive Income - Components of Other Comprehensive Income and Related Tax Effects (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Equity [Abstract] |  |  |
Unrealized holding gains (losses) on available for sale securities | $ 16,141 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax | $ (36,130)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax | $ 6,597 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Less reclassification adjustment for gains recognized in earnings | (429)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax | (355)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax | (1,379)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax
Net unrealized gains (losses) | 15,713 us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent | (36,485)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent | 5,218 us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent
Tax effect | (5,499)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax | 12,770 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax | (1,826)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax
Net-of-tax amount | 10,214 us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent | (23,715)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent | 3,392 us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent
Unrealized holding gains on available for sale securities for which a portion of an other-than-temporary impairment has been recognized in earnings | 244 ccne_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossUnrealizedLossGainAvailableForSaleSecuritiesBeforeTax | 61 ccne_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossUnrealizedLossGainAvailableForSaleSecuritiesBeforeTax | 260 ccne_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossUnrealizedLossGainAvailableForSaleSecuritiesBeforeTax
Less reclassification adjustment for impairment loss recognized in earnings | 0 ccne_OtherThanTemporaryImpairmentLossesInvestmentsReclassificationAdjustmentForImpairmentLossRecognizedInEarnings | 0 ccne_OtherThanTemporaryImpairmentLossesInvestmentsReclassificationAdjustmentForImpairmentLossRecognizedInEarnings | 0 ccne_OtherThanTemporaryImpairmentLossesInvestmentsReclassificationAdjustmentForImpairmentLossRecognizedInEarnings
Net unrealized gains | 244 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentAvailableforsaleSecurities | 61 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentAvailableforsaleSecurities | 260 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentAvailableforsaleSecurities
Tax effect | (86)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossTaxPortionAttributableToParentAvailableforsaleSecurities | (21)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossTaxPortionAttributableToParentAvailableforsaleSecurities | (91)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossTaxPortionAttributableToParentAvailableforsaleSecurities
Net-of-tax amount | 158 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAvailableforsaleSecurities | 40 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAvailableforsaleSecurities | 169 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAvailableforsaleSecurities
Actuarial loss on postemployment health care plan | (117)ccne_OtherComprehensiveIncomeActuarialLossOnPostEmploymentHealthCarePlan | (219)ccne_OtherComprehensiveIncomeActuarialLossOnPostEmploymentHealthCarePlan | (578)ccne_OtherComprehensiveIncomeActuarialLossOnPostEmploymentHealthCarePlan
Net amortization of transition obligation and actuarial gain | 149 ccne_OtherComprehensiveIncomeNetAmortizationOfTransitionObligationAndActuarialGainBeforeTax | 61 ccne_OtherComprehensiveIncomeNetAmortizationOfTransitionObligationAndActuarialGainBeforeTax | 41 ccne_OtherComprehensiveIncomeNetAmortizationOfTransitionObligationAndActuarialGainBeforeTax
Net unrealized loss on postemployment health care plan | 32 ccne_OtherComprehensiveIncomeNetUnrealizedLossOnPostemploymentHealthCarePlan | (158)ccne_OtherComprehensiveIncomeNetUnrealizedLossOnPostemploymentHealthCarePlan | (537)ccne_OtherComprehensiveIncomeNetUnrealizedLossOnPostemploymentHealthCarePlan
Tax effect | (11)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax | 55 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax | 188 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax
Net-of-tax amount | 21 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent | (103)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent | (349)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent
Unrealized gain (loss) on interest rate swap | (213)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax | 229 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax | (465)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
Less reclassification adjustment for losses recognized in earnings | 384 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax | 400 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax | 390 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax
Net unrealized gain (loss) | 171 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax | 629 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax | (75)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax
Tax effect | (60)us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesTaxPortionAttributableToParent | (220)us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesTaxPortionAttributableToParent | 26 us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesTaxPortionAttributableToParent
Net-of-tax amount | 111 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax | 409 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax | (49)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Other comprehensive income (loss) | $ 10,504 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent | $ (23,369)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent | $ 3,163 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent

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