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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) (Sales Comparison Valuation Technique [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Impaired Loans - Commercial Mortgages [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	$ 2,431us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ccne_ImpairedLoansCommercialMortgagesMember / us-gaap_ValuationTechniqueAxis = ccne_SalesComparisonValuationTechniqueMember	$ 2,353us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ccne_ImpairedLoansCommercialMortgagesMember / us-gaap_ValuationTechniqueAxis = ccne_SalesComparisonValuationTechniqueMember
Impaired Loans - Commercial, Industrial, and Agricultural [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	$ 2,563us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ccne_ImpairedLoansCommercialIndustrialAndAgriculturalMember / us-gaap_ValuationTechniqueAxis = ccne_SalesComparisonValuationTechniqueMember	$ 2,820us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ccne_ImpairedLoansCommercialIndustrialAndAgriculturalMember / us-gaap_ValuationTechniqueAxis = ccne_SalesComparisonValuationTechniqueMember
Minimum [Member] | Impaired Loans - Commercial Mortgages [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Sales comparison approach	33.00%ccne_FairValueValuationTechniquesNegativeAdjustmentsForMarketConditions / us-gaap_FairValueByAssetClassAxis = ccne_ImpairedLoansCommercialMortgagesMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = ccne_SalesComparisonValuationTechniqueMember	34.00%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]
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
Maximum [Member] | Impaired Loans - Commercial Mortgages [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Sales comparison approach	83.00%ccne_FairValueValuationTechniquesNegativeAdjustmentsForMarketConditions / us-gaap_FairValueByAssetClassAxis = ccne_ImpairedLoansCommercialMortgagesMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = ccne_SalesComparisonValuationTechniqueMember	100.00%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]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Sales comparison approach	7.00%ccne_FairValueValuationTechniquesNegativeAdjustmentsForMarketConditions / us-gaap_FairValueByAssetClassAxis = ccne_ImpairedLoansCommercialIndustrialAndAgriculturalMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = ccne_SalesComparisonValuationTechniqueMember	49.00%ccne_FairValueValuationTechniquesNegativeAdjustmentsForMarketConditions / us-gaap_FairValueByAssetClassAxis = ccne_ImpairedLoansCommercialIndustrialAndAgriculturalMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = ccne_SalesComparisonValuationTechniqueMember
Weighted Average [Member] | Impaired Loans - Commercial Mortgages [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	(44.00%)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]
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

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.

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