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Deferred Compensation Plans - Schedule of Changes in Deferred Compensation Plan Liability (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Postemployment Benefits [Roll Forward] |  |  |
Balance, beginning of year | $ 4,108 | $ 3,650 | $ 3,675
Deferrals, dividends, and changes in fair value | 845 | 638 | (2)
Deferred compensation payments | (241) | (180) | (23)
Balance, end of year | $ 4,712 | $ 4,108 | $ 3,650

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- Definition Deferred Compensation Arrangement, Deferrals, Dividends And Change In Fair Value + References No definition available. + Details
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Namespace Prefix: | ccne_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Deferred compensation payments. + References No definition available. + Details
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Namespace Prefix: | ccne_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Postemployment Benefits [Roll Forward] + References No definition available. + Details
Name: | ccne_PostemploymentBenefitsRollForward
Namespace Prefix: | ccne_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date. + References No definition available. + Details
Name: | us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant