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Fair Value - Quantitative Information about Level 3 Fair Value Measurements for Financial Instruments Measured at Fair Value on Non Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Impaired Loans - Commercial Mortgages [Member] | Sales Comparison Valuation Technique [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | $ 2,353 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ccne_ImpairedLoansCommercialMortgagesMember / us-gaap_ValuationTechniqueAxis = ccne_SalesComparisonValuationTechniqueMember | $ 3,000 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ccne_ImpairedLoansCommercialMortgagesMember / us-gaap_ValuationTechniqueAxis = ccne_SalesComparisonValuationTechniqueMember
Impaired Loans - Commercial, Industrial, and Agricultural [Member] | Sales Comparison Valuation Technique [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | 2,820 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ccne_ImpairedLoansCommercialIndustrialAndAgriculturalMember / us-gaap_ValuationTechniqueAxis = ccne_SalesComparisonValuationTechniqueMember | 3,274 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ccne_ImpairedLoansCommercialIndustrialAndAgriculturalMember / us-gaap_ValuationTechniqueAxis = ccne_SalesComparisonValuationTechniqueMember
Impaired Loans - Commercial, Industrial, and Agricultural [Member] | Income Approach Valuation Technique [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value |  | $ 432 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ccne_ImpairedLoansCommercialIndustrialAndAgriculturalMember / us-gaap_ValuationTechniqueAxis = us-gaap_IncomeApproachValuationTechniqueMember
Maximum [Member] | Impaired Loans - Commercial Mortgages [Member] | Sales Comparison Valuation Technique [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Sales comparison approach | 100.00%ccne_FairValueValuationTechniquesNegativeAdjustmentsForMarketConditions / us-gaap_FairValueByAssetClassAxis = ccne_ImpairedLoansCommercialMortgagesMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = ccne_SalesComparisonValuationTechniqueMember | 61.00%ccne_FairValueValuationTechniquesNegativeAdjustmentsForMarketConditions / us-gaap_FairValueByAssetClassAxis = ccne_ImpairedLoansCommercialMortgagesMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = ccne_SalesComparisonValuationTechniqueMember
Maximum [Member] | Impaired Loans - Commercial, Industrial, and Agricultural [Member] | Sales Comparison Valuation Technique [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Sales comparison approach | 49.00%ccne_FairValueValuationTechniquesNegativeAdjustmentsForMarketConditions / us-gaap_FairValueByAssetClassAxis = ccne_ImpairedLoansCommercialIndustrialAndAgriculturalMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = ccne_SalesComparisonValuationTechniqueMember | 9.00%ccne_FairValueValuationTechniquesNegativeAdjustmentsForMarketConditions / us-gaap_FairValueByAssetClassAxis = ccne_ImpairedLoansCommercialIndustrialAndAgriculturalMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = ccne_SalesComparisonValuationTechniqueMember
Maximum [Member] | Impaired Loans - Commercial, Industrial, and Agricultural [Member] | Income Approach Valuation Technique [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Income approach |  | 2.00%ccne_FairValueValuationTechniquesChangesInOperatingIncomeExpectations / us-gaap_FairValueByAssetClassAxis = ccne_ImpairedLoansCommercialIndustrialAndAgriculturalMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = us-gaap_IncomeApproachValuationTechniqueMember
Minimum [Member] | Impaired Loans - Commercial Mortgages [Member] | Sales Comparison Valuation Technique [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Sales comparison approach | 34.00%ccne_FairValueValuationTechniquesNegativeAdjustmentsForMarketConditions / us-gaap_FairValueByAssetClassAxis = ccne_ImpairedLoansCommercialMortgagesMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = ccne_SalesComparisonValuationTechniqueMember | 17.00%ccne_FairValueValuationTechniquesNegativeAdjustmentsForMarketConditions / us-gaap_FairValueByAssetClassAxis = ccne_ImpairedLoansCommercialMortgagesMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = ccne_SalesComparisonValuationTechniqueMember
Minimum [Member] | Impaired Loans - Commercial, Industrial, and Agricultural [Member] | Sales Comparison Valuation Technique [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Sales comparison approach | 8.00%ccne_FairValueValuationTechniquesNegativeAdjustmentsForMarketConditions / us-gaap_FairValueByAssetClassAxis = ccne_ImpairedLoansCommercialIndustrialAndAgriculturalMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = ccne_SalesComparisonValuationTechniqueMember |
Weighted Average [Member] | Impaired Loans - Commercial Mortgages [Member] | Sales Comparison Valuation Technique [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Sales comparison approach | (44.00%)ccne_FairValueValuationTechniquesNegativeAdjustmentsForMarketConditions / us-gaap_FairValueByAssetClassAxis = ccne_ImpairedLoansCommercialMortgagesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = ccne_SalesComparisonValuationTechniqueMember | (22.00%)ccne_FairValueValuationTechniquesNegativeAdjustmentsForMarketConditions / us-gaap_FairValueByAssetClassAxis = ccne_ImpairedLoansCommercialMortgagesMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = ccne_SalesComparisonValuationTechniqueMember
Weighted Average [Member] | Impaired Loans - Commercial, Industrial, and Agricultural [Member] | Sales Comparison Valuation Technique [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Sales comparison approach | (13.00%)ccne_FairValueValuationTechniquesNegativeAdjustmentsForMarketConditions / us-gaap_FairValueByAssetClassAxis = ccne_ImpairedLoansCommercialIndustrialAndAgriculturalMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = ccne_SalesComparisonValuationTechniqueMember |

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- Definition Fair value valuation techniques changes in operating income expectations. + References No definition available. + Details
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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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