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Fair Value - Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Commercial Mortgages [Member] |  |
Impaired loans: |  |
Fair value assets and liabilities measured on a nonrecurring basis | $ 7,474 | $ 8,422
Commercial, Industrial, and Agricultural [Member] |  |
Impaired loans: |  |
Fair value assets and liabilities measured on a nonrecurring basis | 1,200 | 1,973
Residential Real Estate [Member] |  |
Impaired loans: |  |
Fair value assets and liabilities measured on a nonrecurring basis | 64 | 402
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 | 0
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 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Residential Real Estate [Member] |  |
Impaired loans: |  |
Fair value assets and liabilities measured on a nonrecurring basis | 0 | 0
Significant Other Observable Inputs (Level 2) [Member] | Commercial Mortgages [Member] |  |
Impaired loans: |  |
Fair value assets and liabilities measured on a nonrecurring basis | 0 | 0
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 | 0
Significant Other Observable Inputs (Level 2) [Member] | Residential Real Estate [Member] |  |
Impaired loans: |  |
Fair value assets and liabilities measured on a nonrecurring basis | 0 | 0
Significant Unobservable Inputs (Level 3) [Member] | Commercial Mortgages [Member] |  |
Impaired loans: |  |
Fair value assets and liabilities measured on a nonrecurring basis | 7,474 | 8,422
Significant Unobservable Inputs (Level 3) [Member] | Commercial, Industrial, and Agricultural [Member] |  |
Impaired loans: |  |
Fair value assets and liabilities measured on a nonrecurring basis | 1,200 | 1,973
Significant Unobservable Inputs (Level 3) [Member] | Residential Real Estate [Member] |  |
Impaired loans: |  |
Fair value assets and liabilities measured on a nonrecurring basis | $ 64 | $ 402

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- Details
Name: | ccne_ImpairedLoansAbstract
Namespace Prefix: | ccne_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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
Name: | us-gaap_AssetsFairValueDisclosureNonrecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant