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Income Taxes - Reconciliation of IncomeTax Attributable to Pre-Ttax Income at Federal Statutory Tax Rates to Income Tax Expense (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Tax Disclosure [Abstract] |  |  |
Tax at statutory rate, value | $ 11,336 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ 8,057 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ 8,241 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Tax exempt income, net value | (1,684)us-gaap_IncomeTaxReconciliationTaxExemptIncome | (1,664)us-gaap_IncomeTaxReconciliationTaxExemptIncome | (1,553)us-gaap_IncomeTaxReconciliationTaxExemptIncome
Bank owned life insurance, value | (364)us-gaap_IncomeTaxReconciliationNondeductibleExpenseLifeInsurance | (543)us-gaap_IncomeTaxReconciliationNondeductibleExpenseLifeInsurance | (341)us-gaap_IncomeTaxReconciliationNondeductibleExpenseLifeInsurance
Merger costs, value | 0 ccne_IncomeTaxReconciliationNondeductibleExpenseMergerCosts | 233 ccne_IncomeTaxReconciliationNondeductibleExpenseMergerCosts | 0 ccne_IncomeTaxReconciliationNondeductibleExpenseMergerCosts
Other, value | 26 us-gaap_IncomeTaxReconciliationOtherAdjustments | 257 us-gaap_IncomeTaxReconciliationOtherAdjustments | 64 us-gaap_IncomeTaxReconciliationOtherAdjustments
Income tax expense | $ 9,314 us-gaap_IncomeTaxExpenseBenefit | $ 6,340 us-gaap_IncomeTaxExpenseBenefit | $ 6,411 us-gaap_IncomeTaxExpenseBenefit
Tax at statutory rate, percent | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Tax exempt income, net percent | (5.20%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome | (7.20%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome | (6.60%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome
Bank owned life insurance, percent | (1.10%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseLifeInsurance | (2.40%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseLifeInsurance | (1.40%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseLifeInsurance
Merger costs, percent | 0.00%ccne_IncomeTaxReconciliationNondeductibleExpenseMergerCostsPercentage | 1.00%ccne_IncomeTaxReconciliationNondeductibleExpenseMergerCostsPercentage | 0.00%ccne_IncomeTaxReconciliationNondeductibleExpenseMergerCostsPercentage
Other, percent | 0.10%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments | 1.10%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments | 0.20%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Income tax expense, percent | 28.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 27.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 27.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to life insurance expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible life insurance expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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