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v3.20.4

Leases - Additional Information (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2020 loan
Leases [Abstract] |  |
Number of renewal options (at least) | loan |  | 1
Rental expense net of rental income | $ | $ 932 |

X
- Definition Lease, Number Of Renewal Options + References No definition available. + Details
Name: | ccne_LeaseNumberOfRenewalOptions
Namespace Prefix: | ccne_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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

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