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Employee Benefit Plans - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 Age Services | Dec. 31, 2013 | Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Employee pretax contribution percentage | 100.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent |  |
Employees compensation | 50.00%ccne_DefinedBenefitPlanCompensationByEmployer |  |
Corporation's matching contribution and related expenses | $ 620 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount | $ 431 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount | $ 397 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Profit sharing contributions | 6.00%ccne_ProfitSharingContributions |  |
Compensation percentage in excess of specified amount | 5.70%ccne_CompensationPercentageInExcessOfSpecifiedAmount |  |
Excess of compensation | 117 ccne_ExcessSpecifiedCompensation |  |
Recognized profit sharing expense | 1,044 ccne_RecognizedProfitSharingExpense | 855 ccne_RecognizedProfitSharingExpense | 783 ccne_RecognizedProfitSharingExpense
Obligations of other liabilities | 4,316 us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent | 4,120 us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent |
Expenses related employee benefit plans | 454 ccne_ExpensesRelatedToSupplementalExecutiveRetirementPlan | 541 ccne_ExpensesRelatedToSupplementalExecutiveRetirementPlan | 728 ccne_ExpensesRelatedToSupplementalExecutiveRetirementPlan
Obligations under survivor benefit plan | 987 ccne_ObligationsUnderSurvivorBenefitPlan | 932 ccne_ObligationsUnderSurvivorBenefitPlan |
Other liabilities related to survivor benefit plan | 55 ccne_ExpensesRelatedToSurvivorBenefitPlan | 119 ccne_ExpensesRelatedToSurvivorBenefitPlan | 127 ccne_ExpensesRelatedToSurvivorBenefitPlan
Employee retirement health care benefits plan | 60 ccne_MinimumAgeForParticipationInBenefitPlan |  |
Minimum service period for participation in benefit plan | 30 ccne_MinimumServicePeriodForParticipationInBenefitPlan |  |
Accumulated benefit obligation | 2,744 us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation | 2,485 us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation |
Amortized from accumulated other comprehensive income into net periodic benefit cost | 173 ccne_AmortizedFromAccumulatedOtherComprehensiveIncomeIntoNetPeriodicBenefitCost |  |
Weighted average discount rate net periodic benefit cost | 4.31%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate | 3.88%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate | 4.29%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate
Weighted average rate accrued benefit obligations | 3.42%ccne_WeightedAverageRateAccruedBenefitObligations | 4.31%ccne_WeightedAverageRateAccruedBenefitObligations | 3.88%ccne_WeightedAverageRateAccruedBenefitObligations
Expected costs of benefit | 5.00%us-gaap_DefinedBenefitPlanHealthCareCostTrendRateAssumedForNextFiscalYear |  |
Percent rate of increase in the health care trend | 1.00%ccne_PercentRateOfIncreaseInHealthCareTrend |  |
Increase in health care trend rates | 273 us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation |  |
Increase service and interest costs | 21 us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents |  |
Percent rate of decrease in the health care trend | 1.00%ccne_PercentRateOfDecreaseInHealthCareTrend |  |
Decrease in health care trend rates | 242 us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1 |  |
Decrease service and interest costs | $ 19 us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1 |  |
Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Employee contribution percentage | 1.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Total contributed by employee percentage | 1.00%ccne_EmployeeBenefitPlansContributionByEmployeePercentage / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Qualifying dependents age group | 60 ccne_QualifyingDependentsAgeGroup / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Employee contribution percentage | 3.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Total contributed by employee percentage | 4.00%ccne_EmployeeBenefitPlansContributionByEmployeePercentage / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Qualifying dependents age group | 65 ccne_QualifyingDependentsAgeGroup / us-gaap_RangeAxis = us-gaap_MaximumMember |  |

X
- Definition Amortized from accumulated other comprehensive income into net periodic benefit cost. + References No definition available. + Details
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- Definition Compensation percentage in excess of specified amount. + References No definition available. + Details
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- Definition Defined benefit plan compensation by employer. + References No definition available. + Details
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- Definition Employee Benefit Plans Contribution By Employee Percentage + References No definition available. + Details
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- Definition Excess specified compensation. + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Expenses related to supplemental executive retirement plan. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Expenses related to survivor benefit plan. + References No definition available. + Details
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Balance Type: | debit
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- Definition Minimum age for participation in benefit plan. + References No definition available. + Details
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- Definition Minimum service period for participation in benefit plan. + References No definition available. + Details
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- Definition Obligations under survivor benefit plan. + References No definition available. + Details
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- Definition Percent rate of decrease in the health care trend. + References No definition available. + Details
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- Definition Percent rate of increase in the health care trend. + References No definition available. + Details
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- Definition Profit sharing contributions. + References No definition available. + Details
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Balance Type: | na
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- Definition Qualifying dependents age group. + References No definition available. + Details
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Balance Type: | na
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- Definition Recognized profit sharing expense. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Weighted average rate accrued benefit obligations. + References No definition available. + Details
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- Definition For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503844 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition The interest rate used to adjust for the time value of money. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition The effect of a one-percentage-point increase in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition The effect of a one-percentage-point increase in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Health Care Cost Trend Rate -URI http://asc.fasb.org/extlink&oid=6514820 + Details
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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- Definition This represents the entire liability recognized in the balance sheet that is associated with the defined benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2417-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2410-114920 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=21915240&loc=d3e1703-114919 + Details
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- Details
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