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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
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PENSION AND OTHER BENEFITS (Details) - Schedule of Changes in Fair Value of Plan Assets [Line Items] |  |
Fair Value of Pension Plan Assets | $ 10,414 us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet | $ 11,026 us-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 | 869 us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 865 us-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 | 869 us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashMember | 865 us-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 | 4,304 us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = cnob_UsCompaniesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 4,310 us-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 | 4,304 us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = cnob_UsCompaniesMember | 4,310 us-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 | 1,394 us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = cnob_InternationalCompaniesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 1,495 us-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 | 1,394 us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = cnob_InternationalCompaniesMember | 1,495 us-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 | 3,754 us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = cnob_DebtAndFixedIncomeSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 4,356 us-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 | 3,754 us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = cnob_DebtAndFixedIncomeSecuritiesMember | 4,356 us-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 | 93 us-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 | 93 us-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 | $ 10,414 us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | $ 11,026 us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member

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