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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
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Financial assets        
Cash and cash equivalents, Carrying Amount $ 88,543us-gaap_CashAndCashEquivalentsAtCarryingValue $ 126,847us-gaap_CashAndCashEquivalentsAtCarryingValue $ 106,282us-gaap_CashAndCashEquivalentsAtCarryingValue $ 82,692us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, Fair Value 88,543us-gaap_CashAndCashEquivalentsFairValueDisclosure 126,847us-gaap_CashAndCashEquivalentsFairValueDisclosure    
Investment securities available-for-sale, Carrying Amount 276,121cnob_AvailableForSaleSecuritiesCarryingValue 289,532cnob_AvailableForSaleSecuritiesCarryingValue    
Investment securities: available-for-sale, Fair Value 276,121us-gaap_AvailableForSaleSecurities 289,532us-gaap_AvailableForSaleSecurities    
Investment securities held-to-maturity, Carrying Amount 231,720us-gaap_HeldToMaturitySecurities 224,682us-gaap_HeldToMaturitySecurities    
Investment securities held-to-maturity, Fair Value 240,263us-gaap_HeldToMaturitySecuritiesFairValue 231,445us-gaap_HeldToMaturitySecuritiesFairValue    
Restricted investment in bank stocks, Carrying Amount 24,874us-gaap_RestrictedInvestments 23,535us-gaap_RestrictedInvestments    
Restricted investment in bank stocks, Fair Value          
Loans held for sale 1,392cnob_LoansHeldForSale      
Loans held for sale 1,392us-gaap_LoansHeldForSaleFairValueDisclosure      
Net loans, Carrying Amount 2,624,806us-gaap_LoansAndLeasesReceivableNetReportedAmount 2,524,481us-gaap_LoansAndLeasesReceivableNetReportedAmount    
Net loans, Fair Value 2,628,873us-gaap_LoansReceivableFairValueDisclosure 2,538,415us-gaap_LoansReceivableFairValueDisclosure    
Derivatives   48us-gaap_DerivativeAssets    
Derivatives   48us-gaap_DerivativeFairValueOfDerivativeNet    
Accrued interest receivable, Carrying Amount 11,513us-gaap_InterestReceivable 11,700us-gaap_InterestReceivable    
Accrued interest receivable, Fair Value 11,513us-gaap_ReceivablesFairValueDisclosure 11,700us-gaap_ReceivablesFairValueDisclosure    
Financial liabilities        
Noninterest-bearing deposits, Carrying Amount 479,652us-gaap_NoninterestBearingDepositLiabilities 492,515us-gaap_NoninterestBearingDepositLiabilities    
Noninterest-bearing deposits, Fair Value 479,652cnob_NonInterestBearingDepositsFairValueDisclosure 492,515cnob_NonInterestBearingDepositsFairValueDisclosure    
Interest-bearing deposits, Carrying Amount 2,016,359us-gaap_InterestBearingDepositLiabilities 1,983,092us-gaap_InterestBearingDepositLiabilities    
Interest-bearing deposits, Fair Value 2,021,144cnob_InterestBearingDepositsFairValueDisclosure 1,990,484cnob_InterestBearingDepositsFairValueDisclosure    
Borrowings, Carrying Amount 525,148us-gaap_LongTermDebt 495,553us-gaap_LongTermDebt    
Borrowings, Fair Value 532,335us-gaap_LongTermDebtFairValue 505,641us-gaap_LongTermDebtFairValue    
Subordinated debentures, Carrying Amount 5,155us-gaap_SubordinatedDebt 5,155us-gaap_SubordinatedDebt    
Subordinated debentures, Fair Value 4,852us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations 4,768us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations    
Derivatives 486cnob_DerivativesLiabilitiesCarryingAmount      
Derivatives 486us-gaap_DerivativeLiabilities      
Accrued interest payable, Carrying Amount 4,316us-gaap_InterestPayableCurrentAndNoncurrent 3,930us-gaap_InterestPayableCurrentAndNoncurrent    
Accrued interest payable, Fair Value 4,316us-gaap_AccruedLiabilitiesFairValueDisclosure 3,930us-gaap_AccruedLiabilitiesFairValueDisclosure    
Fair Value, Inputs, Level 1 [Member]        
Financial assets        
Cash and cash equivalents, Fair Value 88,543us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
126,847us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
   
Investment securities: available-for-sale, Fair Value 12,833us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
13,199us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
   
Investment securities held-to-maturity, Fair Value 29,822us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
29,184us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
   
Restricted investment in bank stocks, Fair Value          
Accrued interest receivable, Fair Value 199us-gaap_ReceivablesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
68us-gaap_ReceivablesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
   
Financial liabilities        
Noninterest-bearing deposits, Fair Value 479,652cnob_NonInterestBearingDepositsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
492,515cnob_NonInterestBearingDepositsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
   
Fair Value, Inputs, Level 2 [Member]        
Financial assets        
Investment securities: available-for-sale, Fair Value 263,288us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
276,333us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Investment securities held-to-maturity, Fair Value 191,722us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
183,489us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Restricted investment in bank stocks, Fair Value          
Loans held for sale 1,392us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
     
Derivatives   48us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Accrued interest receivable, Fair Value 2,943us-gaap_ReceivablesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
3,674us-gaap_ReceivablesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Financial liabilities        
Interest-bearing deposits, Fair Value 2,021,144cnob_InterestBearingDepositsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
1,990,484cnob_InterestBearingDepositsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Borrowings, Fair Value 532,335us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
505,641us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Subordinated debentures, Fair Value 4,852us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
4,768us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Derivatives 486us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
     
Accrued interest payable, Fair Value 4,316us-gaap_AccruedLiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
3,930us-gaap_AccruedLiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Fair Value, Inputs, Level 3 [Member]        
Financial assets        
Investment securities held-to-maturity, Fair Value 18,719us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
18,772us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
   
Restricted investment in bank stocks, Fair Value          
Net loans, Fair Value 2,628,873us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
2,538,415us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
   
Accrued interest receivable, Fair Value $ 8,371us-gaap_ReceivablesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
$ 7,958us-gaap_ReceivablesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member