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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
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Commercial Mortgages [Member] |  |
Impaired loans: |  |
Fair value assets and liabilities measured on a nonrecurring basis | $ 2,353 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ccne_CommercialMortgagesMember | $ 3,000 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ccne_CommercialMortgagesMember
Commercial, Industrial, and Agricultural [Member] |  |
Impaired loans: |  |
Fair value assets and liabilities measured on a nonrecurring basis | 2,820 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ccne_CommercialIndustrialAndAgriculturalMember | 3,706 us-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 | 0 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ccne_CommercialMortgagesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-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 | 0 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ccne_CommercialIndustrialAndAgriculturalMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-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 | 0 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ccne_CommercialMortgagesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 0 us-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 | 0 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ccne_CommercialIndustrialAndAgriculturalMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 0 us-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 | 2,353 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ccne_CommercialMortgagesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 3,000 us-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 | $ 2,820 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ccne_CommercialIndustrialAndAgriculturalMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | $ 3,706 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = ccne_CommercialIndustrialAndAgriculturalMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member

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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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