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

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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