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Foreclosed Assets - Summary of Foreclosed Assets Activity (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Banking and Thrift [Abstract]
Balance, beginning of year	$ 986us-gaap_ForeclosedAssets	$ 325us-gaap_ForeclosedAssets	$ 505us-gaap_ForeclosedAssets
Additions	678ccne_RealEstateAcquiredAdditionsThroughForeclosure	1,151ccne_RealEstateAcquiredAdditionsThroughForeclosure	750ccne_RealEstateAcquiredAdditionsThroughForeclosure
Sales (at carrying value)	(858)ccne_ForeclosedRealEstateAssetsSoldAtCarryingValue	(490)ccne_ForeclosedRealEstateAssetsSoldAtCarryingValue	(930)ccne_ForeclosedRealEstateAssetsSoldAtCarryingValue
Balance, end of year	$ 806us-gaap_ForeclosedAssets	$ 986us-gaap_ForeclosedAssets	$ 325us-gaap_ForeclosedAssets

X

- Definition

Foreclosed real estate assets sold at carrying value.

+ References

No definition available.

+ Details

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

X

- Definition

Real estate acquired additions through foreclosure.

+ References

No definition available.

+ Details

Name:	ccne_RealEstateAcquiredAdditionsThroughForeclosure
Namespace Prefix:	ccne_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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

X

- Definition

Carrying amount as of the balance sheet date of all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings or defeasance; includes real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4437-111522

+ Details

Name:	us-gaap_ForeclosedAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant