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Loans - Purchased Credit Deteriorated Loans (Details) $ in Thousands | Jul. 17, 2020 USD ($)
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Receivables [Abstract] |
Purchase price of loans at acquisition | $ 21,768
Allowance for credit losses at acquisition | 980
Non-credit discount / (premium) at acquisition | 1,063
Par value of acquired loans at acquisition | $ 23,811

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- Definition Allowance For Credit Losses At Acquisition + References No definition available. + Details
Name: | ccne_AllowanceForCreditLossesAtAcquisition
Namespace Prefix: | ccne_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Financing Receivable Purchase Price of Loans At Acquisition + References No definition available. + Details
Name: | ccne_FinancingReceivablePurchasePriceOfLoansAtAcquisition
Namespace Prefix: | ccne_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Non Credit Discount Premium At Acquisition + References No definition available. + Details
Name: | ccne_NonCreditDiscountPremiumAtAcquisition
Namespace Prefix: | ccne_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Par Value of Acquired Loans At Acquisition + References No definition available. + Details
Name: | ccne_ParValueOfAcquiredLoansAtAcquisition
Namespace Prefix: | ccne_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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