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Business Combination - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended | 0 Months Ended | 3 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Oct. 11, 2013 | Mar. 31, 2013 Location
Business Acquisition [Line Items] |  |  |  |  |
Total consideration paid to FC Banc Corp. shareholders in cash | $ 0 us-gaap_PaymentsToAcquireBusinessesGross | $ 0 us-gaap_PaymentsToAcquireBusinessesGross | $ 1,248 us-gaap_PaymentsToAcquireBusinessesGross |  |
Merger cost |  | 2,396 ccne_MergerRelatedCost | 0 ccne_MergerRelatedCost |  |
Deferred tax asset included in accrued interest receivable and other assets | 7,272 us-gaap_DeferredTaxAssetsLiabilitiesNet | 13,660 us-gaap_DeferredTaxAssetsLiabilitiesNet |  |  |
Loans acquired with evidence of credit quality deterioration | 2,225 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodCashFlowsExpectedToBeCollectedAtAcquisition |  |  |  |
Gross loans acquired | 256,418 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodAtAcquisitionAtFairValue |  |  |  |
Combined yield and credit mark | 8,681 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield |  |  |  |
Goodwill arising from Acquisition | 27,194 us-gaap_Goodwill | 27,194 us-gaap_Goodwill | 10,946 us-gaap_Goodwill |  |
Farmers Citizens Bank [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Outstanding equity interests of FC Banc Corp. |  |  |  |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = ccne_FarmersCitizensBankMember
Business acquisition share price |  |  |  | $ 17.91 us-gaap_BusinessAcquisitionSharePrice / us-gaap_BusinessAcquisitionAxis = ccne_FarmersCitizensBankMember | $ 30.00 us-gaap_BusinessAcquisitionSharePrice / us-gaap_BusinessAcquisitionAxis = ccne_FarmersCitizensBankMember
Number of branch locations |  |  |  |  | 8 ccne_BusinessAcquisitionNumberOfBranchLocationsOfAcquiree / us-gaap_BusinessAcquisitionAxis = ccne_FarmersCitizensBankMember
Total consideration paid to FC Banc Corp. shareholders |  | 41,574 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = ccne_FarmersCitizensBankMember |  | 41,600 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = ccne_FarmersCitizensBankMember |
Total consideration paid to FC Banc Corp. shareholders in cash |  | 8,013 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = ccne_FarmersCitizensBankMember |  | 8,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = ccne_FarmersCitizensBankMember |
Total consideration paid to FC Banc Corp. shareholders in shares |  |  |  | 1,873,879 us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued / us-gaap_BusinessAcquisitionAxis = ccne_FarmersCitizensBankMember |
Total value of common stock |  | 33,561 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = ccne_FarmersCitizensBankMember |  | 33,600 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = ccne_FarmersCitizensBankMember |
Deferred tax asset included in accrued interest receivable and other assets | 5,696 us-gaap_DeferredTaxAssetsLiabilitiesNet / us-gaap_BusinessAcquisitionAxis = ccne_FarmersCitizensBankMember |  |  |  |
Goodwill arising from Acquisition | $ 16,248 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ccne_FarmersCitizensBankMember | $ 16,248 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ccne_FarmersCitizensBankMember |  |  |

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