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Fair Value - Sale Securities Reported as Level 1 Securities as of Beginning of Period Were Transferred to Level 2 Category (Detail) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2013 | Sep. 30, 2012
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Securities transferred to level 2 fair value | $ 0 | $ 0 | $ 15,232,000
U.S. Government Sponsored Entities [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Securities transferred to level 2 fair value |  | 0 | 2,000,000
States and Political Subdivisions [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Securities transferred to level 2 fair value |  | 0 | 4,655,000
Residential Mortgage and Assets Backed [Member] |  |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |  |
Securities transferred to level 2 fair value |  | $ 0 | $ 8,577,000

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- Definition Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. + References No definition available. + Details
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Namespace Prefix: | ccne_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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