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Fair Value - Assets and Liabilities Measured at Fair Value on Non-Recurring Basis (Detail) - Commercial Mortgages [Member] - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Impaired loans: |  |
Fair value assets and liabilities measured on a nonrecurring basis | $ 60 | $ 11
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Impaired loans: |  |
Fair value assets and liabilities measured on a nonrecurring basis | 0 | 0
Significant Other Observable Inputs (Level 2) [Member] |  |
Impaired loans: |  |
Fair value assets and liabilities measured on a nonrecurring basis | 0 | 0
Significant Unobservable Inputs (Level 3) [Member] |  |
Impaired loans: |  |
Fair value assets and liabilities measured on a nonrecurring basis | $ 60 | $ 11

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- Definition Impaired loans. + References No definition available. + Details
Name: | ccne_ImpairedLoansAbstract
Namespace Prefix: | ccne_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureNonrecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_FairValueByAssetClassAxis=ccne_CommercialMortgagesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |