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COMPREHENSIVE INCOME (Details) - Schedule of Accumulated Other Comprehensive Income (Loss) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Schedule of Accumulated Other Comprehensive Income (Loss) [Abstract]    
Investment securities available for sale, net of tax $ 4,874us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax $ 2,374us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Cash flow hedge 28cnob_AccumulatedOtherComprehensiveIncomeLossCashFlowHedge  
Unamortized component of securities transferred from available-for-sale to held-to-maturity, net of tax (1,301)cnob_AccumulatedOtherComprehensiveIncomeLossUnamortizedComponentOfSecuritiesTransferredFromAvailableForSaleToHeldToMaturityNetOfTax (1,425)cnob_AccumulatedOtherComprehensiveIncomeLossUnamortizedComponentOfSecuritiesTransferredFromAvailableForSaleToHeldToMaturityNetOfTax
Defined benefit pension and post-retirement plans, net of tax (4,615)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax (3,493)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax
Total $ (1,014)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ (2,544)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax