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Securities - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 Securities | Dec. 31, 2014 Securities
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Investments, Debt and Equity Securities [Abstract] |  |
Number of securities holdings | 0 ccne_NumberOfSecuritiesHoldings | 0 ccne_NumberOfSecuritiesHoldings
Shareholders' equity percentage | 10.00%ccne_ShareholdersEquityPercentage | 10.00%ccne_ShareholdersEquityPercentage
Securities | $ 292,962 us-gaap_TradingSecuritiesPledgedAsCollateral | $ 325,799 us-gaap_TradingSecuritiesPledgedAsCollateral

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- Definition Number of securities holdings. + References No definition available. + Details
Name: | ccne_NumberOfSecuritiesHoldings
Namespace Prefix: | ccne_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Shareholders equity percentage. + References No definition available. + Details
Name: | ccne_ShareholdersEquityPercentage
Namespace Prefix: | ccne_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The fair value of trading securities that serve as collateral for borrowings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5086-111524 + Details
Name: | us-gaap_TradingSecuritiesPledgedAsCollateral
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant