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

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