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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Basic earnings per common share computation |  |  |  |  |  |  |  |  |  |  |
Net Income | $ 6,743 us-gaap_NetIncomeLoss | $ 5,548 us-gaap_NetIncomeLoss | $ 5,617 us-gaap_NetIncomeLoss | $ 5,166 us-gaap_NetIncomeLoss | $ 4,728 us-gaap_NetIncomeLoss | $ 4,703 us-gaap_NetIncomeLoss | $ 2,951 us-gaap_NetIncomeLoss | $ 4,297 us-gaap_NetIncomeLoss | $ 23,074 us-gaap_NetIncomeLoss | $ 16,679 us-gaap_NetIncomeLoss | $ 17,136 us-gaap_NetIncomeLoss
Net earnings allocated to participating securities |  |  |  |  |  |  |  |  | (95)ccne_NetEarningsAllocatedToParticipatingSecurities | (73)ccne_NetEarningsAllocatedToParticipatingSecurities | (62)ccne_NetEarningsAllocatedToParticipatingSecurities
Net earnings allocated to common stock |  |  |  |  |  |  |  |  | 22,979 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 16,606 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 17,074 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Weighted average common shares outstanding, including shares considered participating securities |  |  |  |  |  |  |  |  | 14,412 us-gaap_WeightedAverageBasicSharesOutstandingProForma | 12,929 us-gaap_WeightedAverageBasicSharesOutstandingProForma | 12,441 us-gaap_WeightedAverageBasicSharesOutstandingProForma
Less: Average participating securities |  |  |  |  |  |  |  |  | (53)ccne_AverageParticipatingSecurities | (50)ccne_AverageParticipatingSecurities | (41)ccne_AverageParticipatingSecurities
Weighted average shares |  |  |  |  |  |  |  |  | 14,359 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 12,879 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 12,400 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic earnings per common share | $ 0.47 us-gaap_EarningsPerShareBasic | $ 0.39 us-gaap_EarningsPerShareBasic | $ 0.39 us-gaap_EarningsPerShareBasic | $ 0.36 us-gaap_EarningsPerShareBasic | $ 0.33 us-gaap_EarningsPerShareBasic | $ 0.38 us-gaap_EarningsPerShareBasic | $ 0.24 us-gaap_EarningsPerShareBasic | $ 0.34 us-gaap_EarningsPerShareBasic | $ 1.60 us-gaap_EarningsPerShareBasic | $ 1.29 us-gaap_EarningsPerShareBasic | $ 1.38 us-gaap_EarningsPerShareBasic
Diluted earnings per common share computation |  |  |  |  |  |  |  |  |  |  |
Net earnings allocated to common stock |  |  |  |  |  |  |  |  | 22,979 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | 16,606 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | 17,074 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Weighted average common shares outstanding for basic earnings per common share |  |  |  |  |  |  |  |  | 14,359 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 12,879 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 12,400 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Add: Dilutive effects of assumed exercises of stock options |  |  |  |  |  |  |  |  | 1 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment | 2 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment | 3 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Weighted average shares and dilutive potential common shares |  |  |  |  |  |  |  |  | 14,360 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 12,881 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 12,403 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted earnings per common share | $ 0.47 us-gaap_EarningsPerShareDiluted | $ 0.39 us-gaap_EarningsPerShareDiluted | $ 0.39 us-gaap_EarningsPerShareDiluted | $ 0.36 us-gaap_EarningsPerShareDiluted | $ 0.33 us-gaap_EarningsPerShareDiluted | $ 0.38 us-gaap_EarningsPerShareDiluted | $ 0.24 us-gaap_EarningsPerShareDiluted | $ 0.34 us-gaap_EarningsPerShareDiluted | $ 1.60 us-gaap_EarningsPerShareDiluted | $ 1.29 us-gaap_EarningsPerShareDiluted | $ 1.38 us-gaap_EarningsPerShareDiluted
Distributed Earnings Allocated to Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Basic earnings per common share computation |  |  |  |  |  |  |  |  |  |  |
Net earnings allocated to common stock |  |  |  |  |  |  |  |  | 9,476 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = ccne_DistributedEarningsAllocatedToCommonStockMember | 8,532 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = ccne_DistributedEarningsAllocatedToCommonStockMember | 8,182 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = ccne_DistributedEarningsAllocatedToCommonStockMember
Undistributed Earnings Allocated to Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Basic earnings per common share computation |  |  |  |  |  |  |  |  |  |  |
Net earnings allocated to common stock |  |  |  |  |  |  |  |  | $ 13,503 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = ccne_WeightedAverageSharesAndDilutivePotentialCommonSharesMember | $ 8,074 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = ccne_WeightedAverageSharesAndDilutivePotentialCommonSharesMember | $ 8,892 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = ccne_WeightedAverageSharesAndDilutivePotentialCommonSharesMember

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