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Parent Company Only Financial Information - Condensed Balance Sheets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
ASSETS
Trading securities	$ 4,505us-gaap_TradingSecurities	$ 4,127us-gaap_TradingSecurities
Total Assets	2,189,213us-gaap_Assets	2,131,289us-gaap_Assets
LIABILITIES
Subordinated debentures	20,620us-gaap_SubordinatedDebt	20,620us-gaap_SubordinatedDebt
Total liabilities	2,000,665us-gaap_Liabilities	1,966,378us-gaap_Liabilities
Total shareholders' equity	188,548us-gaap_StockholdersEquity	164,911us-gaap_StockholdersEquity	145,364us-gaap_StockholdersEquity	131,889us-gaap_StockholdersEquity
Total liabilities and shareholders' equity	2,189,213us-gaap_LiabilitiesAndStockholdersEquity	2,131,289us-gaap_LiabilitiesAndStockholdersEquity
Parent Company [Member]
ASSETS
Cash	1,556us-gaap_Cash / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	1,778us-gaap_Cash / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Trading securities	275us-gaap_TradingSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	276us-gaap_TradingSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Investment in bank subsidiary	184,671ccne_InvestmentInBankSubsidiary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	161,983ccne_InvestmentInBankSubsidiary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Investment in non-bank subsidiaries	23,720ccne_InvestmentInNonBankSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	22,738ccne_InvestmentInNonBankSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Deferred tax asset	529us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	636us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other assets	2,301us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	2,240us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total Assets	213,052us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	189,651us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
LIABILITIES
Borrowings from subsidiary	1,350us-gaap_OtherBorrowings / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	1,350us-gaap_OtherBorrowings / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Subordinated debentures	20,620us-gaap_SubordinatedDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	20,620us-gaap_SubordinatedDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other liabilities	2,534us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	2,770us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total liabilities	24,504us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	24,740us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total shareholders' equity	188,548us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	164,911us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total liabilities and shareholders' equity	$ 213,052us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	$ 189,651us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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