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Fair Value Measurements and Fair Value of Financial Instruments (Details) - Fair value, assets and liabilities measured on nonrecurring basis, valuation techniques (Commercial Real Estate Portfolio Segment [Member], Appraisals of Collateral Valuation Technique [Member])	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Minimum [Member] | Impaired Loans [Member]
Fair Value Measurements and Fair Value of Financial Instruments (Details) - Fair value, assets and liabilities measured on nonrecurring basis, valuation techniques [Line Items]
Discounted Range	8.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = cnob_ImpairedLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = cnob_AppraisalsOfCollateralValuationTechniqueMember	8.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = cnob_ImpairedLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = cnob_AppraisalsOfCollateralValuationTechniqueMember
Minimum [Member] | Other Real Estate Owned [Member]
Fair Value Measurements and Fair Value of Financial Instruments (Details) - Fair value, assets and liabilities measured on nonrecurring basis, valuation techniques [Line Items]
Discounted Range	0.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = cnob_OtherRealEstateOwnedMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = cnob_AppraisalsOfCollateralValuationTechniqueMember	0.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = cnob_OtherRealEstateOwnedMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = cnob_AppraisalsOfCollateralValuationTechniqueMember
Maximum [Member] | Impaired Loans [Member]
Fair Value Measurements and Fair Value of Financial Instruments (Details) - Fair value, assets and liabilities measured on nonrecurring basis, valuation techniques [Line Items]
Discounted Range	12.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = cnob_ImpairedLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = cnob_AppraisalsOfCollateralValuationTechniqueMember	12.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = cnob_ImpairedLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = cnob_AppraisalsOfCollateralValuationTechniqueMember
Maximum [Member] | Other Real Estate Owned [Member]
Fair Value Measurements and Fair Value of Financial Instruments (Details) - Fair value, assets and liabilities measured on nonrecurring basis, valuation techniques [Line Items]
Discounted Range	25.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = cnob_OtherRealEstateOwnedMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = cnob_AppraisalsOfCollateralValuationTechniqueMember	25.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = cnob_OtherRealEstateOwnedMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = cnob_AppraisalsOfCollateralValuationTechniqueMember
Impaired Loans [Member]
Fair Value Measurements and Fair Value of Financial Instruments (Details) - Fair value, assets and liabilities measured on nonrecurring basis, valuation techniques [Line Items]
Valuation Technique	Appraisals of collateral value	Appraisals of collateral value
Other Real Estate Owned [Member]
Fair Value Measurements and Fair Value of Financial Instruments (Details) - Fair value, assets and liabilities measured on nonrecurring basis, valuation techniques [Line Items]
Valuation Technique	Appraisals of collateral value	Appraisals of collateral value

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- Details

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- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Description of the inputs and valuation technique(s) used to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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