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Income Taxes - Additional Information (Detail) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013
Business Acquisition [Line Items] |  |
Unrecognized tax benefit | $ 0 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | $ 0 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Income tax matters accrued interest or penalties | 0 us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued | 0 us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued
Income tax examination, open tax year description | Tax years 2011 through 2013 remain open to federal and state examination. |
Net operating loss carryforward, amount | 4,703,000 us-gaap_OperatingLossCarryforwards |
Farmers Citizens Bank [Member] |  |
Business Acquisition [Line Items] |  |
Net operating loss carryforward, amount | $ 6,367,000 us-gaap_OperatingLossCarryforwards / us-gaap_BusinessAcquisitionAxis = ccne_FarmersCitizensBankMember |
Net operating loss carryforward, expiration year | 2033 |

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- Definition The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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