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Fair Value (Details 4) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Commercial mortgages [Member]
Assets and liabilities measured at fair value on a non-recurring basis
Fair value assets and liabilities measured on a nonrecurring basis	$ 7,907	$ 7,219
Commercial mortgages [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets and liabilities measured at fair value on a non-recurring basis
Fair value assets and liabilities measured on a nonrecurring basis	0	0
Commercial mortgages [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets and liabilities measured at fair value on a non-recurring basis
Fair value assets and liabilities measured on a nonrecurring basis	0	0
Commercial mortgages [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets and liabilities measured at fair value on a non-recurring basis
Fair value assets and liabilities measured on a nonrecurring basis	7,907	7,219
Commercial industrial and agricultural [Member]
Assets and liabilities measured at fair value on a non-recurring basis
Fair value assets and liabilities measured on a nonrecurring basis	3,986	3,190
Commercial industrial and agricultural [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets and liabilities measured at fair value on a non-recurring basis
Fair value assets and liabilities measured on a nonrecurring basis	0	0
Commercial industrial and agricultural [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets and liabilities measured at fair value on a non-recurring basis
Fair value assets and liabilities measured on a nonrecurring basis	0	0
Commercial industrial and agricultural [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets and liabilities measured at fair value on a non-recurring basis
Fair value assets and liabilities measured on a nonrecurring basis	3,986	3,190
Residential real estate [Member]
Assets and liabilities measured at fair value on a non-recurring basis
Fair value assets and liabilities measured on a nonrecurring basis	437	105
Residential real estate [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets and liabilities measured at fair value on a non-recurring basis
Fair value assets and liabilities measured on a nonrecurring basis	0	0
Residential real estate [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets and liabilities measured at fair value on a non-recurring basis
Fair value assets and liabilities measured on a nonrecurring basis	0	0
Residential real estate [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets and liabilities measured at fair value on a non-recurring basis
Fair value assets and liabilities measured on a nonrecurring basis	$ 437	$ 105

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- Details

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Namespace Prefix:	ccne_
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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

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Namespace Prefix:	us-gaap_
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Period Type:	instant