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PENSION AND OTHER BENEFITS (Details) - Schedule of Allocation of Plan Assets
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Equity Securities      
Target Allocation 100.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations    
% of Plan Assets 100.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations 100.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations  
Weighted Average Expected Long-Term Rate of Return 5.50%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets 5.50%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets 5.50%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
Domestic Equity Securities [Member]      
Equity Securities      
Target Allocation 45.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cnob_DomesticEquitySecuritiesMember
   
% of Plan Assets 42.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cnob_DomesticEquitySecuritiesMember
39.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cnob_DomesticEquitySecuritiesMember
 
Weighted Average Expected Long-Term Rate of Return 6.50%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cnob_DomesticEquitySecuritiesMember
   
International Equity Securities [Member]      
Equity Securities      
Target Allocation 15.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cnob_InternationalEquitySecuritiesMember
   
% of Plan Assets 13.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cnob_InternationalEquitySecuritiesMember
14.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cnob_InternationalEquitySecuritiesMember
 
Weighted Average Expected Long-Term Rate of Return 6.50%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cnob_InternationalEquitySecuritiesMember
   
Debt And Fixed Income Securities [Member]      
Equity Securities      
Target Allocation 39.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cnob_DebtAndFixedIncomeSecuritiesMember
   
% of Plan Assets 36.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cnob_DebtAndFixedIncomeSecuritiesMember
39.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cnob_DebtAndFixedIncomeSecuritiesMember
 
Weighted Average Expected Long-Term Rate of Return 4.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cnob_DebtAndFixedIncomeSecuritiesMember
   
Cash And Other Alternative Investments [Member]      
Equity Securities      
Target Allocation 1.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cnob_CashAndOtherAlternativeInvestmentsMember
   
% of Plan Assets 9.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cnob_CashAndOtherAlternativeInvestmentsMember
8.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cnob_CashAndOtherAlternativeInvestmentsMember
 
Weighted Average Expected Long-Term Rate of Return 0.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cnob_CashAndOtherAlternativeInvestmentsMember