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Income Taxes - Summary of Income Tax Expense (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Current - federal	$ 8,471us-gaap_CurrentFederalTaxExpenseBenefit	$ 7,189us-gaap_CurrentFederalTaxExpenseBenefit	$ 6,535us-gaap_CurrentFederalTaxExpenseBenefit
Current - state	110ccne_CurrentStateTaxExpenseBenefit	128ccne_CurrentStateTaxExpenseBenefit	116ccne_CurrentStateTaxExpenseBenefit
Deferred - federal	733us-gaap_DeferredFederalIncomeTaxExpenseBenefit	(977)us-gaap_DeferredFederalIncomeTaxExpenseBenefit	(240)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Income tax expense	$ 9,314us-gaap_IncomeTaxExpenseBenefit	$ 6,340us-gaap_IncomeTaxExpenseBenefit	$ 6,411us-gaap_IncomeTaxExpenseBenefit

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- Definition

Current state tax expense benefit.

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- Definition

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section S99

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Current Tax Expense (or Benefit)

-URI http://asc.fasb.org/extlink&oid=6509736



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-Number 210

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

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-Paragraph 1

-Subparagraph (SAB TOPIC 6.I.7)

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Deferred Tax Expense (or Benefit)

-URI http://asc.fasb.org/extlink&oid=6510177



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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

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-Section S99

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-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690



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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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