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Fair Value - Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Commercial Mortgages [Member]
Impaired loans:
Fair value assets and liabilities measured on a nonrecurring basis	$ 9,921	$ 8,422
Commercial, Industrial, and Agricultural [Member]
Impaired loans:
Fair value assets and liabilities measured on a nonrecurring basis	1,610	1,973
Residential Real Estate [Member]
Impaired loans:
Fair value assets and liabilities measured on a nonrecurring basis	74	402
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Commercial Mortgages [Member]
Impaired loans:
Fair value assets and liabilities measured on a nonrecurring basis	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Commercial, Industrial, and Agricultural [Member]
Impaired loans:
Fair value assets and liabilities measured on a nonrecurring basis	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Residential Real Estate [Member]
Impaired loans:
Fair value assets and liabilities measured on a nonrecurring basis	0	0
Significant Other Observable Inputs (Level 2) [Member] | Commercial Mortgages [Member]
Impaired loans:
Fair value assets and liabilities measured on a nonrecurring basis	0	0
Significant Other Observable Inputs (Level 2) [Member] | Commercial, Industrial, and Agricultural [Member]
Impaired loans:
Fair value assets and liabilities measured on a nonrecurring basis	0	0
Significant Other Observable Inputs (Level 2) [Member] | Residential Real Estate [Member]
Impaired loans:
Fair value assets and liabilities measured on a nonrecurring basis	0	0
Significant Unobservable Inputs (Level 3) [Member] | Commercial Mortgages [Member]
Impaired loans:
Fair value assets and liabilities measured on a nonrecurring basis	9,921	8,422
Significant Unobservable Inputs (Level 3) [Member] | Commercial, Industrial, and Agricultural [Member]
Impaired loans:
Fair value assets and liabilities measured on a nonrecurring basis	1,610	1,973
Significant Unobservable Inputs (Level 3) [Member] | Residential Real Estate [Member]
Impaired loans:
Fair value assets and liabilities measured on a nonrecurring basis	$ 74	$ 402

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- Details

Name:	ccne_ImpairedLoansAbstract
Namespace Prefix:	ccne_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

No definition available.

+ Details

Name:	us-gaap_AssetsFairValueDisclosureNonrecurring
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant