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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
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Impaired Loans - Commercial Mortgages [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | $ 2,431 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ccne_ImpairedLoansCommercialMortgagesMember / us-gaap_ValuationTechniqueAxis = ccne_SalesComparisonValuationTechniqueMember | $ 2,353 us-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 | $ 2,563 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ccne_ImpairedLoansCommercialIndustrialAndAgriculturalMember / us-gaap_ValuationTechniqueAxis = ccne_SalesComparisonValuationTechniqueMember | $ 2,820 us-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 Fair value valuation techniques negative adjustments for market conditions. + 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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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | instant

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- Details
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