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Fair Value - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Impaired loans, recorded investment | $ 25,107 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance |  | $ 24,657 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
Impaired loans allowance | 4,001 us-gaap_ImpairedFinancingReceivableRelatedAllowance |  | 3,415 us-gaap_ImpairedFinancingReceivableRelatedAllowance
Collateral Dependent Loans [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Impaired loans, recorded investment | 7,049 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ccne_CollateralDependentLoansMember | 7,423 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ccne_CollateralDependentLoansMember |
Impaired loans allowance | 2,056 us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ccne_CollateralDependentLoansMember | 2,250 us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ccne_CollateralDependentLoansMember |
Impaired loans, additional provisions | $ 3 ccne_ImpairedFinancingReceivableAdditionalProvisions / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ccne_CollateralDependentLoansMember | $ 350 ccne_ImpairedFinancingReceivableAdditionalProvisions / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ccne_CollateralDependentLoansMember |

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- Definition Impaired financing receivable additional provisions. + References No definition available. + Details
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Namespace Prefix: | ccne_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of allowance for credit losses related to recorded investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |