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STOCKHOLDERS' EQUITY AND REGULATORY REQUIREMENTS (Details) - Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Sep. 15, 2011
Dec. 31, 2013
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Tier One Leverage Capital   $ 1,250us-gaap_TierOneLeverageCapital  
Tier One Leverage Capital to Average Assets 4.00%us-gaap_TierOneLeverageCapitalToAverageAssets    
Tier One Leverage Capital Required for Capital Adequacy to Average Assets 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets    
Tier One Leverage Capital Required to be Well Capitalized to Average Assets 8.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets    
Tier One Risk Based Capital to Risk Weighted Assets 5.00%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets    
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 6.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets    
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets 10.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets    
Union Center National Bank [Member]      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Tier One Leverage Capital 300,399us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= cnob_UnionCenterNationalBankMember		   159,431us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= cnob_UnionCenterNationalBankMember
Tier One Leverage Capital to Average Assets 9.33%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= cnob_UnionCenterNationalBankMember		   9.69%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= cnob_UnionCenterNationalBankMember
Tier One Leverage Capital Required for Capital Adequacy 128,729us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= cnob_UnionCenterNationalBankMember		   65,813us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= cnob_UnionCenterNationalBankMember
Tier One Leverage Capital Required for Capital Adequacy to Average Assets 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= cnob_UnionCenterNationalBankMember		   4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= cnob_UnionCenterNationalBankMember
Tier One Leverage Capital Required to be Well Capitalized 160,911us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= cnob_UnionCenterNationalBankMember		   82,266us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= cnob_UnionCenterNationalBankMember
Tier One Leverage Capital Required to be Well Capitalized to Average Assets 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= cnob_UnionCenterNationalBankMember		   5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= cnob_UnionCenterNationalBankMember
Tier One Risk Based Capital 300,399us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= cnob_UnionCenterNationalBankMember		   159,431us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= cnob_UnionCenterNationalBankMember
Tier One Risk Based Capital to Risk Weighted Assets 10.40%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= cnob_UnionCenterNationalBankMember		   12.10%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= cnob_UnionCenterNationalBankMember
Tier One Risk Based Capital Required for Capital Adequacy 115,493us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= cnob_UnionCenterNationalBankMember		   52,704us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= cnob_UnionCenterNationalBankMember
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= cnob_UnionCenterNationalBankMember		   4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= cnob_UnionCenterNationalBankMember
Tier One Risk Based Capital Required to be Well Capitalized 173,239us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= cnob_UnionCenterNationalBankMember		   79,057us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= cnob_UnionCenterNationalBankMember
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= cnob_UnionCenterNationalBankMember		   6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= cnob_UnionCenterNationalBankMember
Capital 314,769us-gaap_Capital
/ dei_LegalEntityAxis
= cnob_UnionCenterNationalBankMember		   169,974us-gaap_Capital
/ dei_LegalEntityAxis
= cnob_UnionCenterNationalBankMember
Capital to Risk Weighted Assets 10.90%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= cnob_UnionCenterNationalBankMember		   12.91%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= cnob_UnionCenterNationalBankMember
Capital Required for Capital Adequacy 230,986us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= cnob_UnionCenterNationalBankMember		   105,329us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= cnob_UnionCenterNationalBankMember
Capital Required for Capital Adequacy to Risk Weighted Assets 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= cnob_UnionCenterNationalBankMember		   8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= cnob_UnionCenterNationalBankMember
Capital Required to be Well Capitalized 288,732us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= cnob_UnionCenterNationalBankMember		   131,661us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= cnob_UnionCenterNationalBankMember
Capital Required to be Well Capitalized to Risk Weighted Assets 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= cnob_UnionCenterNationalBankMember		   10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= cnob_UnionCenterNationalBankMember
Parent Company [Member]      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Tier One Leverage Capital 301,593us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		   159,316us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Tier One Leverage Capital to Average Assets 9.37%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		   9.69%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Tier One Leverage Capital Required for Capital Adequacy 128,747us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		   65,765us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Tier One Leverage Capital Required for Capital Adequacy to Average Assets 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		   4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Tier One Leverage Capital Required to be Well Capitalized        
Tier One Leverage Capital Required to be Well Capitalized to Average Assets        
Tier One Risk Based Capital 301,593us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		   159,316us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Tier One Risk Based Capital to Risk Weighted Assets 10.44%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		   12.10%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Tier One Risk Based Capital Required for Capital Adequacy 115,561us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		   52,666us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		   4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Tier One Risk Based Capital Required to be Well Capitalized        
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets        
Capital 315,963us-gaap_Capital
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		   169,894us-gaap_Capital
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Capital to Risk Weighted Assets 10.94%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		   12.90%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Capital Required for Capital Adequacy 231,121us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		   105,361us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Capital Required for Capital Adequacy to Risk Weighted Assets 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		   8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Capital Required to be Well Capitalized        
Capital Required to be Well Capitalized to Risk Weighted Assets