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COMMITMENTS, CONTINGENCIES AND CONCENTRATIONS OF CREDIT RISK (Details) - Summary of Financial Instruments with Off-Balance Sheet Risk (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Supply Commitment [Line Items]    
Off-balance sheet commitements $ 489,821us-gaap_SignificantSupplyCommitmentRemainingMinimumAmountCommitted $ 238,256us-gaap_SignificantSupplyCommitmentRemainingMinimumAmountCommitted
Commercial Portfolio Segment [Member] | Supply Commitment [Member]    
Supply Commitment [Line Items]    
Off-balance sheet commitements 236,447us-gaap_SignificantSupplyCommitmentRemainingMinimumAmountCommitted
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_SupplyCommitmentAxis
= us-gaap_SupplyCommitmentMember		 109,661us-gaap_SignificantSupplyCommitmentRemainingMinimumAmountCommitted
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_SupplyCommitmentAxis
= us-gaap_SupplyCommitmentMember
Home Equity Line of Credit [Member]    
Supply Commitment [Line Items]    
Off-balance sheet commitements 56,031us-gaap_SignificantSupplyCommitmentRemainingMinimumAmountCommitted
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember		 41,836us-gaap_SignificantSupplyCommitmentRemainingMinimumAmountCommitted
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
Commercial Real Estate Portfolio Segment [Member] | Supply Commitment [Member]    
Supply Commitment [Line Items]    
Off-balance sheet commitements 169,043us-gaap_SignificantSupplyCommitmentRemainingMinimumAmountCommitted
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_SupplyCommitmentAxis
= us-gaap_SupplyCommitmentMember		 48,129us-gaap_SignificantSupplyCommitmentRemainingMinimumAmountCommitted
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_SupplyCommitmentAxis
= us-gaap_SupplyCommitmentMember
Standby Letters of Credit [Member]    
Supply Commitment [Line Items]    
Off-balance sheet commitements 27,500us-gaap_SignificantSupplyCommitmentRemainingMinimumAmountCommitted
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_StandbyLettersOfCreditMember		 9,655us-gaap_SignificantSupplyCommitmentRemainingMinimumAmountCommitted
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_StandbyLettersOfCreditMember
Financial Standby Letter of Credit [Member]    
Supply Commitment [Line Items]    
Off-balance sheet commitements   21,844us-gaap_SignificantSupplyCommitmentRemainingMinimumAmountCommitted
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_FinancialStandbyLetterOfCreditMember
Residential Portfolio Segment [Member]    
Supply Commitment [Line Items]    
Off-balance sheet commitements   1,858us-gaap_SignificantSupplyCommitmentRemainingMinimumAmountCommitted
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
Overdraft Protection Lines [Member]    
Supply Commitment [Line Items]    
Off-balance sheet commitements $ 800us-gaap_SignificantSupplyCommitmentRemainingMinimumAmountCommitted
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cnob_OverdraftProtectionLinesMember		 $ 5,273us-gaap_SignificantSupplyCommitmentRemainingMinimumAmountCommitted
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cnob_OverdraftProtectionLinesMember