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Business Combinations (Details) - Loans accounted for in accordance with ASC 310-30 (Loans accounted for in accordance with FASB ASC 310-30 [Member], USD $)
In Thousands, unless otherwise specified
Jul. 01, 2014
Loans accounted for in accordance with FASB ASC 310-30 [Member]
 
Business Combinations (Details) - Loans accounted for in accordance with ASC 310-30 [Line Items]  
Contractual principal and accrued interest at acquisition $ 23,284us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance
/ us-gaap_DebtInstrumentAxis
= cnob_LoansAccountedForInAccordanceWithFasbAsc31030Member
Principal not expected to be collected (non-accretable 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