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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 $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |
Securities transferred to level 2 fair value | $ 15,232
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 | 2,000
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 | 4,655
Residential and Multi-Family Mortgage [Member] |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |
Securities transferred to level 2 fair value | $ 8,577

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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