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Capital Requirements and Restrictions on Retained Earnings - Summary of Actual and Required Capital Amounts and Ratios (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital to Risk Weighted Assets, Actual Amount $ 199,034us-gaap_Capital $ 183,984us-gaap_Capital
Total Capital to Risk Weighted Assets, Actual Ratio 14.30%us-gaap_CapitalToRiskWeightedAssets 13.72%us-gaap_CapitalToRiskWeightedAssets
Total Capital to Risk Weighted Assets, For Capital Adequacy Purposes Amount 111,374us-gaap_CapitalRequiredForCapitalAdequacy 107,316us-gaap_CapitalRequiredForCapitalAdequacy
Total Capital to Risk Weighted Assets, For Capital Adequacy Purposes Ratio 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
Tier 1 (Core) Capital to Risk Weighted Assets, Actual Amount 181,661us-gaap_TierOneRiskBasedCapital 167,773us-gaap_TierOneRiskBasedCapital
Tier 1 (Core) Capital to Risk Weighted Assets, Actual Ratio 13.05%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets 12.51%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
Tier 1 (Core) Capital to Risk Weighted Assets, For Capital Adequacy Purposes Amount 55,687us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy 53,658us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
Tier 1 (Core) Capital to Risk Weighted Assets, For Capital Adequacy Purposes Ratio 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
Tier 1 (Core) Capital to Average Assets, Actual Amount 181,661us-gaap_TierOneLeverageCapital 167,773us-gaap_TierOneLeverageCapital
Tier 1 (Core) Capital to Average Assets, Actual Ratio 8.39%us-gaap_TierOneLeverageCapitalToAverageAssets 7.96%us-gaap_TierOneLeverageCapitalToAverageAssets
Tier 1 (Core) Capital to Average Assets, For Capital Adequacy Purposes, Amount 86,641us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy 84,332us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
Tier 1 (Core) Capital to Average Assets, For Capital Adequacy Purposes, Ratio 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
Bank [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital to Risk Weighted Assets, Actual Amount 180,597us-gaap_Capital
/ dei_LegalEntityAxis
= ccne_BankMember		 166,440us-gaap_Capital
/ dei_LegalEntityAxis
= ccne_BankMember
Total Capital to Risk Weighted Assets, Actual Ratio 13.16%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= ccne_BankMember		 12.57%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= ccne_BankMember
Total Capital to Risk Weighted Assets, For Capital Adequacy Purposes Amount 109,758us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= ccne_BankMember		 105,912us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= ccne_BankMember
Total Capital to Risk Weighted Assets, For Capital Adequacy Purposes Ratio 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= ccne_BankMember		 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= ccne_BankMember
Total Capital to Risk Weighted Assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 137,198us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= ccne_BankMember		 132,390us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= ccne_BankMember
Total Capital to Risk Weighted Assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= ccne_BankMember		 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= ccne_BankMember
Tier 1 (Core) Capital to Risk Weighted Assets, Actual Amount 164,835us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= ccne_BankMember		 151,585us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= ccne_BankMember
Tier 1 (Core) Capital to Risk Weighted Assets, Actual Ratio 12.01%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= ccne_BankMember		 11.45%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= ccne_BankMember
Tier 1 (Core) Capital to Risk Weighted Assets, For Capital Adequacy Purposes Amount 54,879us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= ccne_BankMember		 52,956us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= ccne_BankMember
Tier 1 (Core) Capital to Risk Weighted Assets, For Capital Adequacy Purposes Ratio 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= ccne_BankMember		 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= ccne_BankMember
Tier 1 (Core) Capital to Risk Weighted Assets, To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount 82,319us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= ccne_BankMember		 79,434us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= ccne_BankMember
Tier 1 (Core) Capital to Risk Weighted Assets, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= ccne_BankMember		 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= ccne_BankMember
Tier 1 (Core) Capital to Average Assets, Actual Amount 164,835us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= ccne_BankMember		 151,585us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= ccne_BankMember
Tier 1 (Core) Capital to Average Assets, Actual Ratio 7.71%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= ccne_BankMember		 7.39%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= ccne_BankMember
Tier 1 (Core) Capital to Average Assets, For Capital Adequacy Purposes, Amount 85,503us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= ccne_BankMember		 82,078us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= ccne_BankMember
Tier 1 (Core) Capital to Average Assets, For Capital Adequacy Purposes, Ratio 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= ccne_BankMember		 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= ccne_BankMember
Tier 1 (Core) Capital to Average Assets, To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount $ 106,878us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= ccne_BankMember		 $ 102,597us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= ccne_BankMember
Tier 1 (Core) Capital to Average Assets, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= ccne_BankMember		 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= ccne_BankMember