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v3.19.1

Revenue from Contracts with Customers - Additional Information (Detail) | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Revenue from Contract with Customer [Abstract] |  |
Percentage of primary source of revenue | 90.20% | 88.70%

X
- Definition Contract with Customer, Percentage of Primary Source of Revenue + References No definition available. + Details
Name: | ccne_ContractwithCustomerPercentageofPrimarySourceofRevenue
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