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Subsequent Event - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified			1 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jul. 31, 2013 Subsequent Event [Member] Commercial Loan [Member]
Subsequent Event [Line Items]
Impaired financing receivable recorded investment	$ 25,314	$ 25,520	$ 5,171
Impaired financing receivable investment loan loss recovery			$ 1,379

X

- Definition

Impaired financing receivable investment loan loss recovery.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 14A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953550-111524

+ Details

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

X

- Details

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