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Loans - Restructured in Troubled Debt (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 Loans | Dec. 31, 2013 Loans
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | 16 us-gaap_FinancingReceivableModificationsNumberOfContracts2 | 12 us-gaap_FinancingReceivableModificationsNumberOfContracts2
Loan Balance | $ 18,658 us-gaap_FinancingReceivableModificationsRecordedInvestment | $ 12,136 us-gaap_FinancingReceivableModificationsRecordedInvestment
Specific Reserve | 2,670 ccne_FinancingReceivableModificationsSpecificReserve | 1,455 ccne_FinancingReceivableModificationsSpecificReserve
Commercial, Industrial, and Agricultural [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | 6 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ccne_CommercialIndustrialAndAgriculturalMember | 5 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ccne_CommercialIndustrialAndAgriculturalMember
Loan Balance | 3,920 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ccne_CommercialIndustrialAndAgriculturalMember | 1,790 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ccne_CommercialIndustrialAndAgriculturalMember
Specific Reserve | 157 ccne_FinancingReceivableModificationsSpecificReserve / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ccne_CommercialIndustrialAndAgriculturalMember | 115 ccne_FinancingReceivableModificationsSpecificReserve / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ccne_CommercialIndustrialAndAgriculturalMember
Commercial Mortgages [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | 10 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ccne_CommercialMortgagesMember | 7 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ccne_CommercialMortgagesMember
Loan Balance | 14,738 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ccne_CommercialMortgagesMember | 10,346 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ccne_CommercialMortgagesMember
Specific Reserve | 2,513 ccne_FinancingReceivableModificationsSpecificReserve / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ccne_CommercialMortgagesMember | 1,340 ccne_FinancingReceivableModificationsSpecificReserve / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = ccne_CommercialMortgagesMember
Residential Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | 0 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_ResidentialRealEstateMember | 0 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_ResidentialRealEstateMember
Loan Balance | 0 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_ResidentialRealEstateMember | 0 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_ResidentialRealEstateMember
Specific Reserve | 0 ccne_FinancingReceivableModificationsSpecificReserve / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_ResidentialRealEstateMember | 0 ccne_FinancingReceivableModificationsSpecificReserve / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_ResidentialRealEstateMember
Consumer [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | 0 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_ConsumerLoanMember | 0 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_ConsumerLoanMember
Loan Balance | 0 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_ConsumerLoanMember | 0 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_ConsumerLoanMember
Specific Reserve | 0 ccne_FinancingReceivableModificationsSpecificReserve / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_ConsumerLoanMember | 0 ccne_FinancingReceivableModificationsSpecificReserve / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_ConsumerLoanMember
Credit Cards [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | 0 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CreditCardReceivablesMember | 0 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CreditCardReceivablesMember
Loan Balance | 0 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CreditCardReceivablesMember | 0 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CreditCardReceivablesMember
Specific Reserve | $ 0 ccne_FinancingReceivableModificationsSpecificReserve / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CreditCardReceivablesMember | $ 0 ccne_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 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524 + Details
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- Definition The amount of the outstanding recorded investment related to 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 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 + Details
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