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Fair Value - Assets and Liabilities Measured at Fair Value on Non-Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Commercial Mortgages [Member]
Impaired loans:
Fair value assets and liabilities measured on a nonrecurring basis	$ 2,353us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ccne_CommercialMortgagesMember	$ 3,000us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ccne_CommercialMortgagesMember
Commercial, Industrial, and Agricultural [Member]
Impaired loans:
Fair value assets and liabilities measured on a nonrecurring basis	2,820us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ccne_CommercialIndustrialAndAgriculturalMember	3,706us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ccne_CommercialIndustrialAndAgriculturalMember
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Commercial Mortgages [Member]
Impaired loans:
Fair value assets and liabilities measured on a nonrecurring basis	0us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ccne_CommercialMortgagesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	0us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ccne_CommercialMortgagesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Commercial, Industrial, and Agricultural [Member]
Impaired loans:
Fair value assets and liabilities measured on a nonrecurring basis	0us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ccne_CommercialIndustrialAndAgriculturalMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	0us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ccne_CommercialIndustrialAndAgriculturalMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Significant Other Observable Inputs (Level 2) [Member] | Commercial Mortgages [Member]
Impaired loans:
Fair value assets and liabilities measured on a nonrecurring basis	0us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ccne_CommercialMortgagesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	0us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ccne_CommercialMortgagesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Significant Other Observable Inputs (Level 2) [Member] | Commercial, Industrial, and Agricultural [Member]
Impaired loans:
Fair value assets and liabilities measured on a nonrecurring basis	0us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ccne_CommercialIndustrialAndAgriculturalMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	0us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ccne_CommercialIndustrialAndAgriculturalMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Significant Unobservable Inputs (Level 3) [Member] | Commercial Mortgages [Member]
Impaired loans:
Fair value assets and liabilities measured on a nonrecurring basis	2,353us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ccne_CommercialMortgagesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	3,000us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ccne_CommercialMortgagesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Significant Unobservable Inputs (Level 3) [Member] | Commercial, Industrial, and Agricultural [Member]
Impaired loans:
Fair value assets and liabilities measured on a nonrecurring basis	$ 2,820us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ccne_CommercialIndustrialAndAgriculturalMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	$ 3,706us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ccne_CommercialIndustrialAndAgriculturalMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member

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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.

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