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Securities - Summary of Structured Pooled Trust Preferred Securities (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items] |  |  |
Adjusted Amortized Cost | $ 800 ccne_PreferredSecuritiesAdjustedAmortizedCostBasis |  |
Unrealized Gain (Loss) | 105 ccne_UnrealizedGainLossOnPreferredSecurities |  |
Fair Value | 905 ccne_PreferredSecuritiesFairValueDisclosure |  |
Credit Losses Realized in Earnings | 0 ccne_PreferredSecuritiesCreditLossesRealizedIncludedInEarning | 0 ccne_PreferredSecuritiesCreditLossesRealizedIncludedInEarning | 0 ccne_PreferredSecuritiesCreditLossesRealizedIncludedInEarning
ALESCO Preferred Funding V, Ltd [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Adjusted Amortized Cost | 800 ccne_PreferredSecuritiesAdjustedAmortizedCostBasis / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ccne_AlescoPreferredFundingVLtdMember |  |
Unrealized Gain (Loss) | 105 ccne_UnrealizedGainLossOnPreferredSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ccne_AlescoPreferredFundingVLtdMember |  |
Fair Value | 905 ccne_PreferredSecuritiesFairValueDisclosure / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ccne_AlescoPreferredFundingVLtdMember |  |
Credit Losses Realized in Earnings | 0 ccne_PreferredSecuritiesCreditLossesRealizedIncludedInEarning / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ccne_AlescoPreferredFundingVLtdMember | 0 ccne_PreferredSecuritiesCreditLossesRealizedIncludedInEarning / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ccne_AlescoPreferredFundingVLtdMember | 0 ccne_PreferredSecuritiesCreditLossesRealizedIncludedInEarning / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ccne_AlescoPreferredFundingVLtdMember
ALESCO Preferred Funding XII, Ltd [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Adjusted Amortized Cost | 0 ccne_PreferredSecuritiesAdjustedAmortizedCostBasis / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ccne_AlescoPreferredFundingXiiLtdMember |  |
Unrealized Gain (Loss) | 0 ccne_UnrealizedGainLossOnPreferredSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ccne_AlescoPreferredFundingXiiLtdMember |  |
Fair Value | 0 ccne_PreferredSecuritiesFairValueDisclosure / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ccne_AlescoPreferredFundingXiiLtdMember |  |
Credit Losses Realized in Earnings | 0 ccne_PreferredSecuritiesCreditLossesRealizedIncludedInEarning / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ccne_AlescoPreferredFundingXiiLtdMember | 0 ccne_PreferredSecuritiesCreditLossesRealizedIncludedInEarning / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ccne_AlescoPreferredFundingXiiLtdMember | 0 ccne_PreferredSecuritiesCreditLossesRealizedIncludedInEarning / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ccne_AlescoPreferredFundingXiiLtdMember
ALESCO Preferred Funding XVII, Ltd [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Adjusted Amortized Cost | 0 ccne_PreferredSecuritiesAdjustedAmortizedCostBasis / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ccne_AlescoPreferredFundingXviiLtdMember |  |
Unrealized Gain (Loss) | 0 ccne_UnrealizedGainLossOnPreferredSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ccne_AlescoPreferredFundingXviiLtdMember |  |
Fair Value | 0 ccne_PreferredSecuritiesFairValueDisclosure / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ccne_AlescoPreferredFundingXviiLtdMember |  |
Credit Losses Realized in Earnings | 0 ccne_PreferredSecuritiesCreditLossesRealizedIncludedInEarning / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ccne_AlescoPreferredFundingXviiLtdMember | 0 ccne_PreferredSecuritiesCreditLossesRealizedIncludedInEarning / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ccne_AlescoPreferredFundingXviiLtdMember | 0 ccne_PreferredSecuritiesCreditLossesRealizedIncludedInEarning / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ccne_AlescoPreferredFundingXviiLtdMember
Preferred Term Securities XVI, Ltd [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Adjusted Amortized Cost | 0 ccne_PreferredSecuritiesAdjustedAmortizedCostBasis / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ccne_PreferredTermSecuritiesXviLtdMember |  |
Unrealized Gain (Loss) | 0 ccne_UnrealizedGainLossOnPreferredSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ccne_PreferredTermSecuritiesXviLtdMember |  |
Fair Value | 0 ccne_PreferredSecuritiesFairValueDisclosure / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ccne_PreferredTermSecuritiesXviLtdMember |  |
Credit Losses Realized in Earnings | 0 ccne_PreferredSecuritiesCreditLossesRealizedIncludedInEarning / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ccne_PreferredTermSecuritiesXviLtdMember | 0 ccne_PreferredSecuritiesCreditLossesRealizedIncludedInEarning / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ccne_PreferredTermSecuritiesXviLtdMember | 0 ccne_PreferredSecuritiesCreditLossesRealizedIncludedInEarning / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ccne_PreferredTermSecuritiesXviLtdMember
US Capital Funding VI, Ltd. [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Adjusted Amortized Cost | 0 ccne_PreferredSecuritiesAdjustedAmortizedCostBasis / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ccne_UsCapitalFundingViLtdMember |  |
Unrealized Gain (Loss) | 0 ccne_UnrealizedGainLossOnPreferredSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ccne_UsCapitalFundingViLtdMember |  |
Fair Value | 0 ccne_PreferredSecuritiesFairValueDisclosure / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ccne_UsCapitalFundingViLtdMember |  |
Credit Losses Realized in Earnings | $ 0 ccne_PreferredSecuritiesCreditLossesRealizedIncludedInEarning / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ccne_UsCapitalFundingViLtdMember | $ 0 ccne_PreferredSecuritiesCreditLossesRealizedIncludedInEarning / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ccne_UsCapitalFundingViLtdMember | $ 0 ccne_PreferredSecuritiesCreditLossesRealizedIncludedInEarning / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ccne_UsCapitalFundingViLtdMember

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