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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Common stock issued in acquisition, shares		1,873,879us-gaap_StockIssuedDuringPeriodSharesAcquisitions
Exercise of stock options, shares, including tax benefit	34,250us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised	40,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised	31,875us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Purchase of treasury stock, shares	100,000us-gaap_TreasuryStockSharesAcquired
Reissue of treasury stock, shares	6,986us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued	6,497us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued	39,811us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued
Cash dividends declared, per share	$ 0.66us-gaap_CommonStockDividendsPerShareDeclared	$ 0.66us-gaap_CommonStockDividendsPerShareDeclared	$ 0.66us-gaap_CommonStockDividendsPerShareDeclared
Additional Paid-In Capital [Member]
Common stock issued in acquisition, shares		1,873,879us-gaap_StockIssuedDuringPeriodSharesAcquisitions / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Restricted stock award grants, shares	35,400ccne_StockIssuedDuringPeriodSharesRestrictedStockAwardGrants / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	31,500ccne_StockIssuedDuringPeriodSharesRestrictedStockAwardGrants / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	26,900ccne_StockIssuedDuringPeriodSharesRestrictedStockAwardGrants / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Exercise of stock options, shares, including tax benefit	34,250us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	40,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	31,875us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Reissue of treasury stock, shares	6,986us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	6,497us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	39,811us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Retained Earnings [Member]
Cash dividends declared, per share	$ 0.66us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	$ 0.66us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	$ 0.66us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Treasury Stock [Member]
Restricted stock award grants, shares	35,400ccne_StockIssuedDuringPeriodSharesRestrictedStockAwardGrants / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember	31,500ccne_StockIssuedDuringPeriodSharesRestrictedStockAwardGrants / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember	26,900ccne_StockIssuedDuringPeriodSharesRestrictedStockAwardGrants / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Exercise of stock options, shares, including tax benefit	34,250us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember	40,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember	31,875us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Purchase of treasury stock, shares	100,000us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Reissue of treasury stock, shares	6,986us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember	6,497us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember	39,811us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember

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