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Leases - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Leases [Abstract] |  |
Rental expense net of rental income | $ 932 | $ 870

X
- Definition Rental expense net of rental income. + References No definition available. + Details
Name: | ccne_RentalExpenseNetOfRentalIncome
Namespace Prefix: | ccne_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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