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Securities - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015 Securities	Dec. 31, 2014 Securities
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	$ 292,962us-gaap_TradingSecuritiesPledgedAsCollateral	$ 325,799us-gaap_TradingSecuritiesPledgedAsCollateral

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- Definition

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+ References

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- Definition

Shareholders equity percentage.

+ References

No definition available.

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- 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

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