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Deposits - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deposits [Abstract]
Certificates of deposit of $250 thousand or more	$ 31,400ccne_TimeDeposits250000OrMore	$ 70,527ccne_TimeDeposits250000OrMore

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- Definition

Time Deposits 250000 Or More

+ References

No definition available.

+ Details

Name:	ccne_TimeDeposits250000OrMore
Namespace Prefix:	ccne_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

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