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FAIR VALUE MEASUREMENTS AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
FAIR VALUE MEASUREMENTS AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investment securities: Available-for-sale, Fair Value $ 289,532us-gaap_AvailableForSaleSecurities $ 323,070us-gaap_AvailableForSaleSecurities
Derivatives 48us-gaap_DerivativeFairValueOfDerivativeNet  
Federal Agency Obligations [Member] | Fair Value, Inputs, Level 2 [Member]    
FAIR VALUE MEASUREMENTS AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investment securities: Available-for-sale, Fair Value 32,817us-gaap_AvailableForSaleSecurities
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= us-gaap_FairValueInputsLevel2Member
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_FederalAgencyObligationsMember
Federal Agency Obligations [Member]    
FAIR VALUE MEASUREMENTS AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investment securities: Available-for-sale, Fair Value 32,817us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_FederalAgencyObligationsMember		 19,941us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_FederalAgencyObligationsMember
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
FAIR VALUE MEASUREMENTS AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investment securities: Available-for-sale, Fair Value 60,356us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember		 48,874us-gaap_AvailableForSaleSecurities
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= us-gaap_FairValueInputsLevel2Member
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Residential Mortgage Backed Securities [Member]    
FAIR VALUE MEASUREMENTS AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investment securities: Available-for-sale, Fair Value 60,356us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember		 48,874us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
FAIR VALUE MEASUREMENTS AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investment securities: Available-for-sale, Fair Value 3,046us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		 6,991us-gaap_AvailableForSaleSecurities
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= us-gaap_FairValueInputsLevel2Member
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
Commercial Mortgage Backed Securities [Member]    
FAIR VALUE MEASUREMENTS AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investment securities: Available-for-sale, Fair Value 3,046us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		 6,991us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
FAIR VALUE MEASUREMENTS AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investment securities: Available-for-sale, Fair Value 8,406us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 31,460us-gaap_AvailableForSaleSecurities
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= us-gaap_USStatesAndPoliticalSubdivisionsMember
US States and Political Subdivisions Debt Securities [Member]    
FAIR VALUE MEASUREMENTS AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investment securities: Available-for-sale, Fair Value 8,406us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 31,460us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Trust Preferred Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
FAIR VALUE MEASUREMENTS AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investment securities: Available-for-sale, Fair Value 16,306us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_TrustPreferredSecuritiesMember		 19,403us-gaap_AvailableForSaleSecurities
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= us-gaap_FairValueInputsLevel2Member
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_TrustPreferredSecuritiesMember
Trust Preferred Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
FAIR VALUE MEASUREMENTS AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investment securities: Available-for-sale, Fair Value   36us-gaap_AvailableForSaleSecurities
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/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_TrustPreferredSecuritiesMember
Trust Preferred Securities [Member]    
FAIR VALUE MEASUREMENTS AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investment securities: Available-for-sale, Fair Value 16,306us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_TrustPreferredSecuritiesMember		 19,403us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_TrustPreferredSecuritiesMember
Corporate Bonds and Notes [Member] | Fair Value, Inputs, Level 2 [Member]    
FAIR VALUE MEASUREMENTS AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investment securities: Available-for-sale, Fair Value 125,777us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CorporateBondsAndNotesMember		 158,630us-gaap_AvailableForSaleSecurities
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= us-gaap_FairValueInputsLevel2Member
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CorporateBondsAndNotesMember
Corporate Bonds and Notes [Member]    
FAIR VALUE MEASUREMENTS AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investment securities: Available-for-sale, Fair Value 125,777us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CorporateBondsAndNotesMember		 158,630us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CorporateBondsAndNotesMember
Asset-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
FAIR VALUE MEASUREMENTS AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investment securities: Available-for-sale, Fair Value 27,502us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember		 15,979us-gaap_AvailableForSaleSecurities
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= us-gaap_FairValueInputsLevel2Member
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
Asset-backed Securities [Member]    
FAIR VALUE MEASUREMENTS AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investment securities: Available-for-sale, Fair Value 27,502us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember		 15,979us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
Certificate of Deposit [Member] | Fair Value, Inputs, Level 2 [Member]    
FAIR VALUE MEASUREMENTS AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investment securities: Available-for-sale, Fair Value 2,123us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CertificateOfDepositMember		  
Certificate of Deposit [Member]    
FAIR VALUE MEASUREMENTS AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investment securities: Available-for-sale, Fair Value 2,123us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_CertificateOfDepositMember		 2,262us-gaap_AvailableForSaleSecurities
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= cnob_CertificateOfDepositMember
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
FAIR VALUE MEASUREMENTS AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investment securities: Available-for-sale, Fair Value 307us-gaap_AvailableForSaleSecurities
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/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember		 287us-gaap_AvailableForSaleSecurities
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Equity Securities [Member]    
FAIR VALUE MEASUREMENTS AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investment securities: Available-for-sale, Fair Value 307us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember		 287us-gaap_AvailableForSaleSecurities
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Other Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
FAIR VALUE MEASUREMENTS AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investment securities: Available-for-sale, Fair Value 12,892us-gaap_AvailableForSaleSecurities
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/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_OtherSecuritiesMember		 5,724us-gaap_AvailableForSaleSecurities
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= cnob_OtherSecuritiesMember
Other Securities [Member]    
FAIR VALUE MEASUREMENTS AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investment securities: Available-for-sale, Fair Value 12,892us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= cnob_OtherSecuritiesMember		 5,724us-gaap_AvailableForSaleSecurities
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US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
FAIR VALUE MEASUREMENTS AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investment securities: Available-for-sale, Fair Value   13,519us-gaap_AvailableForSaleSecurities
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US Treasury Securities [Member]    
FAIR VALUE MEASUREMENTS AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investment securities: Available-for-sale, Fair Value   13,519us-gaap_AvailableForSaleSecurities
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Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 2 [Member]    
FAIR VALUE MEASUREMENTS AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investment securities: Available-for-sale, Fair Value   15,979us-gaap_AvailableForSaleSecurities
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Collateralized Mortgage Obligations [Member]    
FAIR VALUE MEASUREMENTS AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investment securities: Available-for-sale, Fair Value   15,979us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember
Fair Value, Inputs, Level 1 [Member]    
FAIR VALUE MEASUREMENTS AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investment securities: Available-for-sale, Fair Value 13,199us-gaap_AvailableForSaleSecurities
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Fair Value, Inputs, Level 2 [Member]    
FAIR VALUE MEASUREMENTS AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investment securities: Available-for-sale, Fair Value 276,333us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 303,540us-gaap_AvailableForSaleSecurities
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Derivatives 48us-gaap_DerivativeFairValueOfDerivativeNet
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Fair Value, Inputs, Level 3 [Member]    
FAIR VALUE MEASUREMENTS AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investment securities: Available-for-sale, Fair Value   $ 36us-gaap_AvailableForSaleSecurities
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