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Contingency - Additional Information (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Mar. 28, 2018
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Commitments and Contingencies Disclosure [Abstract] |  |
Sales tax examination excluding penalties and interest accrued |  | $ 824
Sales tax examination penalties and interest accrued |  | 339
Sales tax examination liability refund adjustment from settlement with tax authority |  | $ 1,163
Sales tax contingent liabilities | $ 96 |

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- Definition Sales tax contingent liabilities. + References No definition available. + Details
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- Definition Sales tax examination excluding penalties and interest accrued. + References No definition available. + Details
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Namespace Prefix: | ccne_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Sales tax examination liability refund adjustment from settlement with tax authority. + References No definition available. + Details
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Namespace Prefix: | ccne_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Sales tax examination penalties and interest accrued. + References No definition available. + Details
Name: | ccne_SalesTaxExaminationPenaltiesAndInterestAccrued
Namespace Prefix: | ccne_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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