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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
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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 [Line Items] |  |
Investment securities: Available-for-sale, Fair Value | $ 289,532 us-gaap_AvailableForSaleSecurities | $ 323,070 us-gaap_AvailableForSaleSecurities
Derivatives | 48 us-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 | 32,817 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_FederalAgencyObligationsMember | 19,941 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = 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 | 32,817 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_FederalAgencyObligationsMember | 19,941 us-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 | 60,356 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | 48,874 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = 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 | 60,356 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | 48,874 us-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 | 3,046 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember | 6,991 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = 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 | 3,046 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember | 6,991 us-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 | 8,406 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 31,460 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = 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 | 8,406 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 31,460 us-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 | 16,306 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember | 19,403 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = 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 |  | 36 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / 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 | 16,306 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_TrustPreferredSecuritiesMember | 19,403 us-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 | 125,777 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CorporateBondsAndNotesMember | 158,630 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = 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 | 125,777 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CorporateBondsAndNotesMember | 158,630 us-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 | 27,502 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember | 15,979 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = 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 | 27,502 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember | 15,979 us-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 | 2,123 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / 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 | 2,123 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_CertificateOfDepositMember | 2,262 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = 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 | 307 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 287 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
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 | 307 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 287 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
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 | 12,892 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_OtherSecuritiesMember | 5,724 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = 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 | 12,892 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_OtherSecuritiesMember | 5,724 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cnob_OtherSecuritiesMember
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 |  | 13,519 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember
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 |  | 13,519 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember
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 |  | 15,979 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CollateralizedMortgageObligationsMember
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 |  | 15,979 us-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 | 13,199 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 19,530 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
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 | 276,333 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 303,540 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Derivatives | 48 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
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 |  | $ 36 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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