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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 $)	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2012
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Securities transferred to level 2 fair value	$ 0	$ 0	$ 15,232,000
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		0	2,000,000
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		0	4,655,000
Residential Mortgage and Assets Backed [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Securities transferred to level 2 fair value		$ 0	$ 8,577,000

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_
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Period Type:	duration

X

- Details

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