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Securities - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 Securities | Dec. 31, 2013 Securities | Dec. 31, 2012
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 | $ 325,799 us-gaap_TradingSecuritiesPledgedAsCollateral | $ 353,102 us-gaap_TradingSecuritiesPledgedAsCollateral |
Tax provision related to net realized gains | 150 ccne_TaxProvisionRelatedToNetRealizedGains | 124 ccne_TaxProvisionRelatedToNetRealizedGains | 483 ccne_TaxProvisionRelatedToNetRealizedGains
Proceeds from sale of trading securities | 248 us-gaap_ProceedsFromSaleOfSecuritiesOperatingActivities | 5,811 us-gaap_ProceedsFromSaleOfSecuritiesOperatingActivities | 3,386 us-gaap_ProceedsFromSaleOfSecuritiesOperatingActivities
Net realized gains on trading securities | $ 10 us-gaap_TradingSecuritiesRealizedGainLoss | $ 579 us-gaap_TradingSecuritiesRealizedGainLoss | $ 298 us-gaap_TradingSecuritiesRealizedGainLoss

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- Definition Number of securities holdings. + References No definition available. + Details
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- Definition Shareholders equity percentage. + References No definition available. + Details
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- Definition Tax provision related to net realized gains. + References No definition available. + Details
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- Details
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- Definition Cash received from sale of investments in debt and equity securities, classified as operating activities, during the period; includes trading securities and any other investments classified as operating. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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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
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- Definition This item represents the gain (loss) realized during the period from the sale of trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph c -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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