Name:	ccne_AccumulatedOtherComprehensiveIncomeLossEstimatedReclassificationAdjustmentOnDerivativesIncludedInNetIncomeInNextTwelveMonths
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Data Type:	xbrli:monetaryItemType
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Cash collateral pledged.

No definition available.

Name:	ccne_CashCollateralPledged
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Period Type:	instant

Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items]

No definition available.

Name:	ccne_ScheduleOfLoansAndAllowanceForLoanByClassIndividuallyAndCollectivelyEvaluatedForImpairmentLineItems
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Net fair value of all derivative instruments designated as cash flow hedging instruments, which is ordinarily reflected within other comprehensive income.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

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The percentage points added to the reference rate to compute the variable rate on the interest rate derivative.

No definition available.

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Fixed interest rate related to the interest rate derivative.

No definition available.

Name:	us-gaap_DerivativeFixedInterestRate
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Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	us-gaap_DerivativeTermOfContract
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Net fair value of all derivative instruments designated as fair value hedging instruments.

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Stated interest rate of the subordinated debt.

No definition available.

Name:	us-gaap_SubordinatedBorrowingInterestRate
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Data Type:	num:percentItemType
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Namespace Prefix:
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Name:	us-gaap_DerivativeInstrumentRiskAxis=ccne_LiborPlusOneHundredAndFiftyFiveBasisPointsMember
Namespace Prefix:
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