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Revenue from Contracts with Customers - Additional Information (Detail) | 3 Months Ended
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Mar. 31, 2018
Revenue from Contract with Customer [Abstract] |
Percetage of primary source of revenue | 93.30%

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- Definition Percentage of primary source of revenue. + References No definition available. + Details
Name: | ccne_PercentageOfPrimarySourceOfRevenue
Namespace Prefix: | ccne_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration