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Investment Securities (Details) - Schedule of realized gains and losses (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Schedule of realized gains and losses [Abstract]    
Proceeds $ 9,537cnob_ProceedsFromSaleOfInvestmentSecurities $ 50,611cnob_ProceedsFromSaleOfInvestmentSecurities
Gross gains on sales of investment securities 506us-gaap_GainOnSaleOfInvestments 1,432us-gaap_GainOnSaleOfInvestments
Gross losses on sales of investment securities   (17)us-gaap_LossOnSaleOfInvestments
Net gains on sales of investment securities 506us-gaap_GainLossOnSaleOfInvestments 1,415us-gaap_GainLossOnSaleOfInvestments
Less: tax provision on net gains 207cnob_TaxProvisionOnGainOnSaleOfInvestments 380cnob_TaxProvisionOnGainOnSaleOfInvestments
Total $ 299cnob_GainLossOnSaleOfInvestmentsNetOfTax $ 1,035cnob_GainLossOnSaleOfInvestmentsNetOfTax