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Fair Value (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Sale securities reported as Level 1 securities as of the beginning of the period were transferred to the Level 2 category
Securities transferred to level 2 fair value	$ 15,232	$ 27,155
U.S. Government sponsored entities [Member]
Sale securities reported as Level 1 securities as of the beginning of the period were transferred to the Level 2 category
Securities transferred to level 2 fair value	2,000	2,000
States and political subdivisions [Member]
Sale securities reported as Level 1 securities as of the beginning of the period were transferred to the Level 2 category
Securities transferred to level 2 fair value	4,655	4,750
Residential & multi-family mortgage [Member]
Sale securities reported as Level 1 securities as of the beginning of the period were transferred to the Level 2 category
Securities transferred to level 2 fair value	$ 8,577	$ 20,405

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

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

X

- Details

Name:	us-gaap_FairValueTransfersBetweenLevel1AndLevel2DescriptionAndPolicyAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration