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PENSION AND OTHER BENEFITS (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
PENSION AND OTHER BENEFITS (Details) [Line Items]      
General Discussion of Pension and Other Postretirement Benefits The Company maintains a frozen noncontributory pension plan for substantially all of its employees. The benefits are based on years of service and the employee’s compensation over the prior five-year period. The plan’s benefits are payable in the form of a ten year certain and life annuity. The plan is intended to be a tax-qualified defined benefit plan under Section 401(a) of the Internal Revenue Code. Payments may be made under the Pension Plan once attaining the normal retirement age of 65 and are generally equal to 44 percent of a participant’s highest average compensation over a 5-year period.    
Defined Benefit Plan, Effect of Settlements and Curtailments on Accumulated Benefit Obligation $ 15,100,000us-gaap_DefinedBenefitPlanEffectOfSettlementsAndCurtailmentsOnAccumulatedBenefitObligation $ 13,600,000us-gaap_DefinedBenefitPlanEffectOfSettlementsAndCurtailmentsOnAccumulatedBenefitObligation  
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax 434,000us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax    
Defined Benefit Plan, Contributions by Employer 291,000us-gaap_DefinedBenefitPlanContributionsByEmployer 265,000us-gaap_DefinedBenefitPlanContributionsByEmployer 405,000us-gaap_DefinedBenefitPlanContributionsByEmployer
Defined Benefit Plan Minimum Contributions By Employer 400,000cnob_DefinedBenefitPlanMinimumContributionsByEmployer    
Defined Benefit Plan, Contributions by Plan Participants 3,700,000us-gaap_DefinedBenefitPlanContributionsByPlanParticipants    
Defined Benefit Plan, Description of Plan Amendment Beginning with the 2013 Plan Year, the Plan was amended to provide for a 3% nonelective safe harbor contribution for all participants.    
Pension Trust Subsequent Event [Member]      
PENSION AND OTHER BENEFITS (Details) [Line Items]      
Defined Benefit Plan, Contributions by Employer $ 2,000,000us-gaap_DefinedBenefitPlanContributionsByEmployer
/ us-gaap_SubsequentEventTypeAxis
= cnob_PensionTrustSubsequentEventMember
   
Minimum [Member]      
PENSION AND OTHER BENEFITS (Details) [Line Items]      
Defined Benefit Plan, Funded Percentage 85.00%us-gaap_DefinedBenefitPlanFundedPercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Maximum [Member]      
PENSION AND OTHER BENEFITS (Details) [Line Items]      
Defined Benefit Plan, Funded Percentage 115.00%us-gaap_DefinedBenefitPlanFundedPercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember