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PENSION AND OTHER BENEFITS (Details) - Schedule of Changes in Projected Benefit Obligations (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule of Changes in Projected Benefit Obligations [Abstract]      
Projected benefit obligation at beginning of year $ 13,569us-gaap_DefinedBenefitPlanBenefitObligation $ 13,533us-gaap_DefinedBenefitPlanBenefitObligation  
Interest cost 576us-gaap_DefinedBenefitPlanInterestCost 529us-gaap_DefinedBenefitPlanInterestCost 555us-gaap_DefinedBenefitPlanInterestCost
Actuarial loss 2,023us-gaap_DefinedBenefitPlanActuarialGainLoss 255us-gaap_DefinedBenefitPlanActuarialGainLoss  
Benefits paid (701)us-gaap_DefinedBenefitPlanBenefitsPaid (748)us-gaap_DefinedBenefitPlanBenefitsPaid  
Settlements (393)us-gaap_DefinedBenefitPlanSettlementsBenefitObligation    
Projected benefit obligation at end of year 15,074us-gaap_DefinedBenefitPlanBenefitObligation 13,569us-gaap_DefinedBenefitPlanBenefitObligation 13,533us-gaap_DefinedBenefitPlanBenefitObligation
Fair value of plan assets at beginning year 11,026us-gaap_DefinedBenefitPlanFairValueOfPlanAssets 7,034us-gaap_DefinedBenefitPlanFairValueOfPlanAssets  
Actual return on plan assets 413us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets 1,040us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets  
Employer contributions   3,700cnob_DefinedBenefitPlanEmployerContribtutionOfPlanAssets  
Benefits paid (701)cnob_DefinedBenefitPlanBenefitsPaidOnPlanAssets (748)cnob_DefinedBenefitPlanBenefitsPaidOnPlanAssets  
Settlements (324)cnob_DefinedBenefitPlanSettlementsBenefitObligationOnPlanAssets    
Fair value of plan assets at end of year 10,414us-gaap_DefinedBenefitPlanFairValueOfPlanAssets 11,026us-gaap_DefinedBenefitPlanFairValueOfPlanAssets 7,034us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Funded status $ (4,660)us-gaap_DefinedBenefitPlanFundedStatusOfPlan $ (2,543)us-gaap_DefinedBenefitPlanFundedStatusOfPlan