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Real Estate Owned - Summary of Expenses Related to Foreclosed Real Estate (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Real Estate [Abstract] |  |  |
Net loss (gain) on sales | $ 346 | $ (377) | $ (310)
Operating expenses, net of rental income | 240 | 316 | 283
Total | $ 586 | $ (61) | $ (27)

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- Definition Foreclosed real estate gain loss on sale. + References No definition available. + Details
Name: | ccne_ForeclosedRealEstateGainLossOnSale
Namespace Prefix: | ccne_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Foreclosed real estate gain loss on sale net. + References No definition available. + Details
Name: | ccne_ForeclosedRealEstateGainLossOnSaleNet
Namespace Prefix: | ccne_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Foreclosed real estate operating expense net. + References No definition available. + Details
Name: | ccne_ForeclosedRealEstateOperatingExpenseNet
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_RealEstateAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration