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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
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Supply Commitment [Line Items] |  |
Off-balance sheet commitements | $ 489,821 us-gaap_SignificantSupplyCommitmentRemainingMinimumAmountCommitted | $ 238,256 us-gaap_SignificantSupplyCommitmentRemainingMinimumAmountCommitted
Commercial Portfolio Segment [Member] | Supply Commitment [Member] |  |
Supply Commitment [Line Items] |  |
Off-balance sheet commitements | 236,447 us-gaap_SignificantSupplyCommitmentRemainingMinimumAmountCommitted / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_SupplyCommitmentAxis = us-gaap_SupplyCommitmentMember | 109,661 us-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 | 56,031 us-gaap_SignificantSupplyCommitmentRemainingMinimumAmountCommitted / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityMember | 41,836 us-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 | 169,043 us-gaap_SignificantSupplyCommitmentRemainingMinimumAmountCommitted / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_SupplyCommitmentAxis = us-gaap_SupplyCommitmentMember | 48,129 us-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 | 27,500 us-gaap_SignificantSupplyCommitmentRemainingMinimumAmountCommitted / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_StandbyLettersOfCreditMember | 9,655 us-gaap_SignificantSupplyCommitmentRemainingMinimumAmountCommitted / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_StandbyLettersOfCreditMember
Financial Standby Letter of Credit [Member] |  |
Supply Commitment [Line Items] |  |
Off-balance sheet commitements |  | 21,844 us-gaap_SignificantSupplyCommitmentRemainingMinimumAmountCommitted / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_FinancialStandbyLetterOfCreditMember
Residential Portfolio Segment [Member] |  |
Supply Commitment [Line Items] |  |
Off-balance sheet commitements |  | 1,858 us-gaap_SignificantSupplyCommitmentRemainingMinimumAmountCommitted / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
Overdraft Protection Lines [Member] |  |
Supply Commitment [Line Items] |  |
Off-balance sheet commitements | $ 800 us-gaap_SignificantSupplyCommitmentRemainingMinimumAmountCommitted / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cnob_OverdraftProtectionLinesMember | $ 5,273 us-gaap_SignificantSupplyCommitmentRemainingMinimumAmountCommitted / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = cnob_OverdraftProtectionLinesMember

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