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Securities - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 Securities	Dec. 31, 2013 Securities	Dec. 31, 2012
Investments, Debt and Equity Securities [Abstract]
Number of securities holdings	0ccne_NumberOfSecuritiesHoldings	0ccne_NumberOfSecuritiesHoldings
Shareholders' equity percentage	10.00%ccne_ShareholdersEquityPercentage	10.00%ccne_ShareholdersEquityPercentage
Securities	$ 325,799us-gaap_TradingSecuritiesPledgedAsCollateral	$ 353,102us-gaap_TradingSecuritiesPledgedAsCollateral
Tax provision related to net realized gains	150ccne_TaxProvisionRelatedToNetRealizedGains	124ccne_TaxProvisionRelatedToNetRealizedGains	483ccne_TaxProvisionRelatedToNetRealizedGains
Proceeds from sale of trading securities	248us-gaap_ProceedsFromSaleOfSecuritiesOperatingActivities	5,811us-gaap_ProceedsFromSaleOfSecuritiesOperatingActivities	3,386us-gaap_ProceedsFromSaleOfSecuritiesOperatingActivities
Net realized gains on trading securities	$ 10us-gaap_TradingSecuritiesRealizedGainLoss	$ 579us-gaap_TradingSecuritiesRealizedGainLoss	$ 298us-gaap_TradingSecuritiesRealizedGainLoss

X

- Definition

Number of securities holdings.

+ References

No definition available.

+ Details

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X

- Definition

Shareholders equity percentage.

+ References

No definition available.

+ Details

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Namespace Prefix:	ccne_
Data Type:	num:percentItemType
Balance Type:	na
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X

- Definition

Tax provision related to net realized gains.

+ References

No definition available.

+ Details

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- Details

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X

- Definition

Cash received from sale of investments in debt and equity securities, classified as operating activities, during the period; includes trading securities and any other investments classified as operating.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585

+ Details

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X

- Definition

The fair value of trading securities that serve as collateral for borrowings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5086-111524

+ Details

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Namespace Prefix:	us-gaap_
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X

- Definition

This item represents the gain (loss) realized during the period from the sale of trading securities.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph c

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.7(c))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Trading Securities

-URI http://asc.fasb.org/extlink&oid=6526789



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563

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