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Loans - Restructured in Troubled Debt (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended	12 Months Ended
	Jun. 30, 2013 Contracts	Jun. 30, 2012 Contracts	Jun. 30, 2013 Loans	Dec. 31, 2012 Loans
Financing Receivable, Modifications [Line Items]
Number of Loans	0	0	11	10
Loans Balance	$ 10,230		$ 10,230	$ 11,621
Specific Reserve	1,222		1,222	1,099
Commercial, Industrial, and Agricultural [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans			2	2
Loans Balance	1,345		1,345	1,420
Specific Reserve	0		0	0
Commercial Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans			9	8
Loans Balance	8,885		8,885	10,201
Specific Reserve	1,222		1,222	1,099
Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans			0	0
Loans Balance	0		0	0
Specific Reserve	0		0	0
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans			0	0
Loans Balance	0		0	0
Specific Reserve	0		0	0
Credit Cards [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans			0	0
Loans Balance	0		0	0
Specific Reserve	$ 0		$ 0	$ 0

X

- Definition

Financing receivable modifications specific reserve.

+ References

No definition available.

+ Details

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

X

- Details

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

X

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953676-111524

+ Details

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X

- Definition

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 40

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554

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Balance Type:	debit
Period Type:	instant