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Fair Value (Details 4) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Commercial mortgages [Member] |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |
Fair value assets and liabilities measured on a nonrecurring basis | $ 7,907 | $ 7,219
Commercial mortgages [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |
Fair value assets and liabilities measured on a nonrecurring basis | 0 | 0
Commercial mortgages [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |
Fair value assets and liabilities measured on a nonrecurring basis | 0 | 0
Commercial mortgages [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |
Fair value assets and liabilities measured on a nonrecurring basis | 7,907 | 7,219
Commercial industrial and agricultural [Member] |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |
Fair value assets and liabilities measured on a nonrecurring basis | 3,986 | 3,190
Commercial industrial and agricultural [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |
Fair value assets and liabilities measured on a nonrecurring basis | 0 | 0
Commercial industrial and agricultural [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |
Fair value assets and liabilities measured on a nonrecurring basis | 0 | 0
Commercial industrial and agricultural [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |
Fair value assets and liabilities measured on a nonrecurring basis | 3,986 | 3,190
Residential real estate [Member] |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |
Fair value assets and liabilities measured on a nonrecurring basis | 437 | 105
Residential real estate [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |
Fair value assets and liabilities measured on a nonrecurring basis | 0 | 0
Residential real estate [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |
Fair value assets and liabilities measured on a nonrecurring basis | 0 | 0
Residential real estate [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |
Fair value assets and liabilities measured on a nonrecurring basis | $ 437 | $ 105

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- Details
Name: | ccne_FairValueAssetsAndLiabilitiesMeasuredOnNonrecurringBasisAbstract
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