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Fair Value - Quantitative Information About Level 3 Fair Value Measurements (Detail) (Pooled Trust Preferred [Member], USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | 905 us-gaap_AssetsFairValueDisclosure | 905 us-gaap_AssetsFairValueDisclosure
Collateral Default Rate [Member] | Discounted Cash Flow [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Input utilized two | 0.83% in 2015; 0.5% in 2016 and thereafter | 1% in 2015; 0.5% in 2016 and thereafter
Yield [Member] | Discounted Cash Flow [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Input utilized one | 13.00%ccne_InputUtilizedOne / us-gaap_FairValueByAssetClassAxis = ccne_PooledTrustPreferredMember / us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis = ccne_YieldMember / us-gaap_ValuationTechniqueAxis = ccne_DiscountedCashFlowMember | 11.00%ccne_InputUtilizedOne / us-gaap_FairValueByAssetClassAxis = ccne_PooledTrustPreferredMember / us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis = ccne_YieldMember / us-gaap_ValuationTechniqueAxis = ccne_DiscountedCashFlowMember
Prepayment Speed [Member] | Discounted Cash Flow [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Input utilized two | 2.0% constant prepayment rate in 2015 and thereafter | 2.0% constant prepayment rate in 2015 and thereafter

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- Definition Input utilized one. + References No definition available. + Details
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Namespace Prefix: | ccne_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Input utilized two. + References No definition available. + Details
Name: | ccne_InputUtilizedTwo
Namespace Prefix: | ccne_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_FairValueInputsAssetsQuantitativeInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration