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PENSION AND OTHER BENEFITS (Details) - Schedule of Changes in Fair Value of Plan Assets (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
PENSION AND OTHER BENEFITS (Details) - Schedule of Changes in Fair Value of Plan Assets [Line Items]    
Fair Value of Pension Plan Assets $ 10,414us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet $ 11,026us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet
Cash [Member] | Fair Value, Inputs, Level 1 [Member]    
PENSION AND OTHER BENEFITS (Details) - Schedule of Changes in Fair Value of Plan Assets [Line Items]    
Fair Value of Pension Plan Assets 869us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_CashMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 865us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_CashMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Cash [Member]    
PENSION AND OTHER BENEFITS (Details) - Schedule of Changes in Fair Value of Plan Assets [Line Items]    
Fair Value of Pension Plan Assets 869us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_CashMember		 865us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_CashMember
Us Companies [Member] | Fair Value, Inputs, Level 1 [Member]    
PENSION AND OTHER BENEFITS (Details) - Schedule of Changes in Fair Value of Plan Assets [Line Items]    
Fair Value of Pension Plan Assets 4,304us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cnob_UsCompaniesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 4,310us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cnob_UsCompaniesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Us Companies [Member]    
PENSION AND OTHER BENEFITS (Details) - Schedule of Changes in Fair Value of Plan Assets [Line Items]    
Fair Value of Pension Plan Assets 4,304us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cnob_UsCompaniesMember		 4,310us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cnob_UsCompaniesMember
International Companies [Member] | Fair Value, Inputs, Level 1 [Member]    
PENSION AND OTHER BENEFITS (Details) - Schedule of Changes in Fair Value of Plan Assets [Line Items]    
Fair Value of Pension Plan Assets 1,394us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cnob_InternationalCompaniesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 1,495us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cnob_InternationalCompaniesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
International Companies [Member]    
PENSION AND OTHER BENEFITS (Details) - Schedule of Changes in Fair Value of Plan Assets [Line Items]    
Fair Value of Pension Plan Assets 1,394us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cnob_InternationalCompaniesMember		 1,495us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cnob_InternationalCompaniesMember
Debt And Fixed Income Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
PENSION AND OTHER BENEFITS (Details) - Schedule of Changes in Fair Value of Plan Assets [Line Items]    
Fair Value of Pension Plan Assets 3,754us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cnob_DebtAndFixedIncomeSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 4,356us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cnob_DebtAndFixedIncomeSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Debt And Fixed Income Securities [Member]    
PENSION AND OTHER BENEFITS (Details) - Schedule of Changes in Fair Value of Plan Assets [Line Items]    
Fair Value of Pension Plan Assets 3,754us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cnob_DebtAndFixedIncomeSecuritiesMember		 4,356us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cnob_DebtAndFixedIncomeSecuritiesMember
Real Estate Fund [Member] | Fair Value, Inputs, Level 1 [Member]    
PENSION AND OTHER BENEFITS (Details) - Schedule of Changes in Fair Value of Plan Assets [Line Items]    
Fair Value of Pension Plan Assets 93us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cnob_RealEstateFundMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		  
Real Estate Fund [Member]    
PENSION AND OTHER BENEFITS (Details) - Schedule of Changes in Fair Value of Plan Assets [Line Items]    
Fair Value of Pension Plan Assets 93us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cnob_RealEstateFundMember		  
Fair Value, Inputs, Level 1 [Member]    
PENSION AND OTHER BENEFITS (Details) - Schedule of Changes in Fair Value of Plan Assets [Line Items]    
Fair Value of Pension Plan Assets $ 10,414us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 $ 11,026us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member