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Fair Value - Sale Securities Reported as Level 1 Securities as of Beginning of Period were Transferred to Level 2 Category (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Securities transferred to level 2 fair value	$ 15,232
U.S. Government Sponsored Entities [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Securities transferred to level 2 fair value	2,000
States and Political Subdivisions [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Securities transferred to level 2 fair value	4,655
Residential and Multi-Family Mortgage [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Securities transferred to level 2 fair value	$ 8,577

X

- Definition

Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

+ References

No definition available.

+ Details

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Namespace Prefix:	ccne_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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