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Fair Value - Securities Available for Sale Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3) (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Corporate Notes and Bonds [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance |  | $ 1,980 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ccne_CorporateNotesAndBondsMember
Total gains or (losses): |  |
Included in other comprehensive income (loss) |  | (29)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ccne_CorporateNotesAndBondsMember
Included in realized gains on available-for-sale securities |  | 58 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ccne_CorporateNotesAndBondsMember
Sale of available-for-sale securities |  | (2,009)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ccne_CorporateNotesAndBondsMember
Ending Balance |  | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ccne_CorporateNotesAndBondsMember
Pooled Trust Preferred [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 661 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ccne_PooledTrustPreferredMember | 600 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ccne_PooledTrustPreferredMember
Total gains or (losses): |  |
Included in other comprehensive income (loss) | 244 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ccne_PooledTrustPreferredMember | 61 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ccne_PooledTrustPreferredMember
Included in realized gains on available-for-sale securities | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ccne_PooledTrustPreferredMember | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ccne_PooledTrustPreferredMember
Sale of available-for-sale securities | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ccne_PooledTrustPreferredMember | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ccne_PooledTrustPreferredMember
Ending Balance | $ 905 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ccne_PooledTrustPreferredMember | $ 661 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ccne_PooledTrustPreferredMember

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- Definition Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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