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Fair Value (Details 3) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011
Sale securities reported as Level 1 securities as of the beginning of the period were transferred to the Level 2 category |  |  |  |
Securities transferred to level 2 fair value | $ 70,278 | $ 64,850 | $ 15,232 | $ 27,155
U.S. Treasury [Member] |  |  |  |
Sale securities reported as Level 1 securities as of the beginning of the period were transferred to the Level 2 category |  |  |  |
Securities transferred to level 2 fair value | 0 | 4,053 |  |
U.S. Government sponsored entities [Member] |  |  |  |
Sale securities reported as Level 1 securities as of the beginning of the period were transferred to the Level 2 category |  |  |  |
Securities transferred to level 2 fair value | 26,034 | 16,124 | 2,000 | 2,000
States and political subdivisions [Member] |  |  |  |
Sale securities reported as Level 1 securities as of the beginning of the period were transferred to the Level 2 category |  |  |  |
Securities transferred to level 2 fair value | 3,771 | 4,929 | 4,655 | 4,750
Residential mortgage and asset backed [Member] |  |  |  |
Sale securities reported as Level 1 securities as of the beginning of the period were transferred to the Level 2 category |  |  |  |
Securities transferred to level 2 fair value | 40,473 | 37,659 | 8,577 | 20,405
Commercial mortgage and asset backed [Member] |  |  |  |
Sale securities reported as Level 1 securities as of the beginning of the period were transferred to the Level 2 category |  |  |  |
Securities transferred to level 2 fair value | $ 0 | $ 2,085 |  |

X
- 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
Name: | ccne_FairValueAssetsLevelOneToLevelTwoTransfersAmount
Namespace Prefix: | ccne_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_FairValueTransfersBetweenLevel1AndLevel2DescriptionAndPolicyAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration