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Parent Company Only Financial Information - Condensed Statements of Income and Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended			1 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	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Dividends from:
Income before income taxes and equity in undistributed net income of subsidiaries:									$ 32,388us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	$ 23,019us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	$ 23,547us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax benefit									9,314us-gaap_IncomeTaxExpenseBenefit	6,340us-gaap_IncomeTaxExpenseBenefit	6,411us-gaap_IncomeTaxExpenseBenefit
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
Parent Company [Member]
Dividends from:
Bank subsidiary									10,675ccne_DividendsFromBankSubsidiary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	1,875ccne_DividendsFromBankSubsidiary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	7,990ccne_DividendsFromBankSubsidiary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Non-bank subsidiaries									0ccne_DividendsFromNonbankSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	6,674ccne_DividendsFromNonbankSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	0ccne_DividendsFromNonbankSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other									170us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	208us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	208us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total income									10,845us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	8,757us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	8,198us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Expenses									(1,520)us-gaap_OperatingCostsAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(1,461)us-gaap_OperatingCostsAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(1,457)us-gaap_OperatingCostsAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income before income taxes and equity in undistributed net income of subsidiaries:									9,325us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	7,296us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	6,741us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income tax benefit									473us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	438us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	438us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity in undistributed net income of bank subsidiary									12,327ccne_EquityInUndistributedNetIncomeOfBankSubsidiary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	14,080ccne_EquityInUndistributedNetIncomeOfBankSubsidiary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	8,682ccne_EquityInUndistributedNetIncomeOfBankSubsidiary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	12,327ccne_EquityInUndistributedNetIncomeOfBankSubsidiary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	14,080ccne_EquityInUndistributedNetIncomeOfBankSubsidiary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	8,682ccne_EquityInUndistributedNetIncomeOfBankSubsidiary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity in undistributed net income (loss) of non-bank subsidiaries									949ccne_EquityInUndistributedNetIncomeLossOfNonBankSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(5,135)ccne_EquityInUndistributedNetIncomeLossOfNonBankSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	1,275ccne_EquityInUndistributedNetIncomeLossOfNonBankSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	949ccne_EquityInUndistributedNetIncomeLossOfNonBankSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(5,135)ccne_EquityInUndistributedNetIncomeLossOfNonBankSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	1,275ccne_EquityInUndistributedNetIncomeLossOfNonBankSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income									$ 23,074us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	$ 16,679us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	$ 17,136us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	$ 23,074us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	$ 16,679us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	$ 17,136us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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