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FAIR VALUE MEASUREMENTS AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Fair Value Hierarchy (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Financial assets:        
Cash and cash equivalents, Carrying Amount $ 126,847us-gaap_CashAndCashEquivalentsAtCarryingValue $ 82,692us-gaap_CashAndCashEquivalentsAtCarryingValue $ 106,138us-gaap_CashAndCashEquivalentsAtCarryingValue $ 111,101us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, Fair Value 126,847us-gaap_CashAndCashEquivalentsFairValueDisclosure 82,692us-gaap_CashAndCashEquivalentsFairValueDisclosure    
Investment securities available-for-sale, Carrying Amount 289,532cnob_AvailableForSaleSecuritiesCarryingValue 323,070cnob_AvailableForSaleSecuritiesCarryingValue    
Investment securities: available-for-sale, Fair Value 289,532us-gaap_AvailableForSaleSecurities 323,070us-gaap_AvailableForSaleSecurities    
Investment securities held-to-maturity, Carrying Amount 224,682us-gaap_HeldToMaturitySecurities 215,286us-gaap_HeldToMaturitySecurities    
Investment securities held-to-maturity, Fair Value 231,445us-gaap_HeldToMaturitySecuritiesFairValue 210,958us-gaap_HeldToMaturitySecuritiesFairValue    
Investment in restricted stock, at cost, Carrying Amount 23,535us-gaap_RestrictedInvestments 8,986us-gaap_RestrictedInvestments    
Investment in restricted stock, at cost, Fair Value          
Net loans, Carrying Amount 2,524,481us-gaap_LoansReceivableHeldForSaleNet 950,610us-gaap_LoansReceivableHeldForSaleNet    
Net loans, Fair Value 2,538,415us-gaap_LoansReceivableFairValueDisclosure 948,606us-gaap_LoansReceivableFairValueDisclosure    
Derivatives 48us-gaap_DerivativeAssets      
Derivatives 48us-gaap_DerivativeFairValueOfDerivativeNet      
Accrued interest receivable, Carrying Amount 11,700us-gaap_InterestReceivable 6,802us-gaap_InterestReceivable    
Accrued interest receivable, Fair Value 11,700us-gaap_ReceivablesFairValueDisclosure 6,802us-gaap_ReceivablesFairValueDisclosure    
Financial liabilities:        
Noninterest-bearing deposits, Carrying Amount 492,516us-gaap_NoninterestBearingDepositLiabilities 227,370us-gaap_NoninterestBearingDepositLiabilities    
Noninterest-bearing deposits, Fair Value 492,516cnob_NonInterestBearingDepositsFairValueDisclosure 227,370cnob_NonInterestBearingDepositsFairValueDisclosure    
Interest-bearing deposits, Carrying Amount 1,983,091us-gaap_InterestBearingDepositLiabilities 1,114,635us-gaap_InterestBearingDepositLiabilities    
Interest-bearing deposits, Fair Value 1,990,484cnob_InterestBearingDepositsFairValueDisclosure 1,115,781cnob_InterestBearingDepositsFairValueDisclosure    
Borrowings, Carrying Amount 495,553us-gaap_LongTermDebt 146,000us-gaap_LongTermDebt    
Borrowings, Fair Value 505,641us-gaap_LongTermDebtFairValue 157,440us-gaap_LongTermDebtFairValue    
Subordinated debentures, Carrying Amount 5,155us-gaap_SubordinatedDebt 5,155us-gaap_SubordinatedDebt    
Subordinated debentures, Fair Value 4,768us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations 5,143us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations    
Accrued interest payable, Carrying Amount 3,930us-gaap_InterestPayableCurrentAndNoncurrent 963us-gaap_InterestPayableCurrentAndNoncurrent    
Accrued interest payable, Fair Value 3,930us-gaap_AccruedLiabilitiesFairValueDisclosure 963us-gaap_AccruedLiabilitiesFairValueDisclosure    
Fair Value, Inputs, Level 1 [Member]        
Financial assets:        
Cash and cash equivalents, Fair Value 126,847us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 82,692us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		    
Investment securities: available-for-sale, Fair Value 13,199us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 19,530us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		    
Investment securities held-to-maturity, Fair Value 29,184us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 27,037us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		    
Investment in restricted stock, at cost, Fair Value          
Accrued interest receivable, Fair Value 68us-gaap_ReceivablesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 102us-gaap_ReceivablesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		    
Financial liabilities:        
Noninterest-bearing deposits, Fair Value 492,516cnob_NonInterestBearingDepositsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 227,370cnob_NonInterestBearingDepositsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		    
Fair Value, Inputs, Level 2 [Member]        
Financial assets:        
Investment securities: available-for-sale, Fair Value 276,333us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 303,540us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		    
Investment securities held-to-maturity, Fair Value 183,489us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 164,940us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		    
Investment in restricted stock, at cost, Fair Value          
Derivatives 48us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		      
Accrued interest receivable, Fair Value 3,674us-gaap_ReceivablesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 4,034us-gaap_ReceivablesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		    
Financial liabilities:        
Interest-bearing deposits, Fair Value 1,990,484cnob_InterestBearingDepositsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 1,115,781cnob_InterestBearingDepositsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		    
Borrowings, Fair Value 505,641us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 157,440us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		    
Subordinated debentures, Fair Value 4,768us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 5,143us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		    
Accrued interest payable, Fair Value 3,930us-gaap_AccruedLiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 963us-gaap_AccruedLiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		    
Fair Value, Inputs, Level 3 [Member]        
Financial assets:        
Investment securities: available-for-sale, Fair Value   36us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		    
Investment securities held-to-maturity, Fair Value 18,772us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 18,981us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		    
Investment in restricted stock, at cost, Fair Value          
Net loans, Fair Value 2,538,415us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 948,606us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		    
Accrued interest receivable, Fair Value $ 7,958us-gaap_ReceivablesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 $ 2,666us-gaap_ReceivablesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member