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INVESTMENT SECURITIES (Details) - Schedule of realized gains and losses (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule of realized gains and losses [Abstract]      
Proceeds $ 81,844cnob_ProceedsFromSaleOfInvestmentSecurities $ 122,165cnob_ProceedsFromSaleOfInvestmentSecurities $ 130,059cnob_ProceedsFromSaleOfInvestmentSecurities
Gross gains on sales of investment securities 2,837us-gaap_GainOnSaleOfInvestments 2,451us-gaap_GainOnSaleOfInvestments 2,905us-gaap_GainOnSaleOfInvestments
Gross losses on sales of investment securities 19us-gaap_LossOnSaleOfInvestments 88us-gaap_LossOnSaleOfInvestments 23us-gaap_LossOnSaleOfInvestments
Net gains on sales of investment securities 2,818us-gaap_GainLossOnSaleOfInvestments 2,363us-gaap_GainLossOnSaleOfInvestments 2,882us-gaap_GainLossOnSaleOfInvestments
Less: tax provision on net gains (986)cnob_TaxProvisionOnGainOnSaleOfInvestments (645)cnob_TaxProvisionOnGainOnSaleOfInvestments (879)cnob_TaxProvisionOnGainOnSaleOfInvestments
Net gains on sales of investment securities $ 1,832cnob_GainLossOnSaleOfInvestmentsNetOfTax $ 1,718cnob_GainLossOnSaleOfInvestmentsNetOfTax $ 2,003cnob_GainLossOnSaleOfInvestmentsNetOfTax