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

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