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BUSINESS COMBINATIONS (Details) - Loans Accounted for in Accordance with ASC 310-30 (USD $)
Dec. 31, 2014
Jul. 01, 2014
ASC 310-30 Loans    
Fair value of acquired loans $ 1,028,000us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet  
Loans accounted for in accordance with FASB ASC 310-30 [Member]    
ASC 310-30 Loans    
Contractual principal and accrued interest at acquisition   23,284us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance
/ us-gaap_DebtInstrumentAxis
= cnob_LoansAccountedForInAccordanceWithFasbAsc31030Member
Principal not expected to be collected (nonaccretable discount)   (6,942)cnob_ContractualCashFlowsNotExpectedToBeCollectedNonaccretableDifference
/ us-gaap_DebtInstrumentAxis
= cnob_LoansAccountedForInAccordanceWithFasbAsc31030Member
Expected cash flows at acquisition   16,342us-gaap_CertainLoansAcquiredInTransferAccretableYield
/ us-gaap_DebtInstrumentAxis
= cnob_LoansAccountedForInAccordanceWithFasbAsc31030Member
Interest component of expected cash flows (accretable discount)   (5,013)cnob_InterestComponentOfExpectedCashFlowsAccretableDiscount
/ us-gaap_DebtInstrumentAxis
= cnob_LoansAccountedForInAccordanceWithFasbAsc31030Member
Fair value of acquired loans   $ 11,329us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_DebtInstrumentAxis
= cnob_LoansAccountedForInAccordanceWithFasbAsc31030Member