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Loans - Restructured in Troubled Debt (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 Loans	Dec. 31, 2013 Loans
Financing Receivable, Modifications [Line Items]
Number of Loans	16us-gaap_FinancingReceivableModificationsNumberOfContracts2	12us-gaap_FinancingReceivableModificationsNumberOfContracts2
Loan Balance	$ 18,658us-gaap_FinancingReceivableModificationsRecordedInvestment	$ 12,136us-gaap_FinancingReceivableModificationsRecordedInvestment
Specific Reserve	2,670ccne_FinancingReceivableModificationsSpecificReserve	1,455ccne_FinancingReceivableModificationsSpecificReserve
Commercial, Industrial, and Agricultural [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	6us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ccne_CommercialIndustrialAndAgriculturalMember	5us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ccne_CommercialIndustrialAndAgriculturalMember
Loan Balance	3,920us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ccne_CommercialIndustrialAndAgriculturalMember	1,790us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ccne_CommercialIndustrialAndAgriculturalMember
Specific Reserve	157ccne_FinancingReceivableModificationsSpecificReserve / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ccne_CommercialIndustrialAndAgriculturalMember	115ccne_FinancingReceivableModificationsSpecificReserve / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ccne_CommercialIndustrialAndAgriculturalMember
Commercial Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	10us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ccne_CommercialMortgagesMember	7us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ccne_CommercialMortgagesMember
Loan Balance	14,738us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ccne_CommercialMortgagesMember	10,346us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ccne_CommercialMortgagesMember
Specific Reserve	2,513ccne_FinancingReceivableModificationsSpecificReserve / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ccne_CommercialMortgagesMember	1,340ccne_FinancingReceivableModificationsSpecificReserve / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ccne_CommercialMortgagesMember
Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	0us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_ResidentialRealEstateMember	0us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_ResidentialRealEstateMember
Loan Balance	0us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_ResidentialRealEstateMember	0us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_ResidentialRealEstateMember
Specific Reserve	0ccne_FinancingReceivableModificationsSpecificReserve / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_ResidentialRealEstateMember	0ccne_FinancingReceivableModificationsSpecificReserve / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_ResidentialRealEstateMember
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	0us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_ConsumerLoanMember	0us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_ConsumerLoanMember
Loan Balance	0us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_ConsumerLoanMember	0us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_ConsumerLoanMember
Specific Reserve	0ccne_FinancingReceivableModificationsSpecificReserve / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_ConsumerLoanMember	0ccne_FinancingReceivableModificationsSpecificReserve / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_ConsumerLoanMember
Credit Cards [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	0us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CreditCardReceivablesMember	0us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CreditCardReceivablesMember
Loan Balance	0us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CreditCardReceivablesMember	0us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CreditCardReceivablesMember
Specific Reserve	$ 0ccne_FinancingReceivableModificationsSpecificReserve / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CreditCardReceivablesMember	$ 0ccne_FinancingReceivableModificationsSpecificReserve / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CreditCardReceivablesMember

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- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

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- Definition

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+ References

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-Publisher FASB

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-Topic 310

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