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Derivatives (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Dec. 30, 2014
Oct. 15, 2014
Derivatives (Details) [Line Items]          
Derivative, Notional Amount $ 50,000,000invest_DerivativeNotionalAmount    $ 50,000,000invest_DerivativeNotionalAmount    
Interest Expense 5,078,000us-gaap_InterestExpense 2,727,000us-gaap_InterestExpense      
Cash Flow Derivative Instruments Gain (Loss) Recognized In Accumulated Other Comprehensive Income   0cnob_CashFlowDerivativeInstrumentsGainLossRecognizedInAccumulatedOtherComprehensiveIncome      
Cash Flow Hedging [Member] | Interest Rate Swap [Member]          
Derivatives (Details) [Line Items]          
Derivative, Notional Amount       25,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
25,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
Interest Rate Swap [Member]          
Derivatives (Details) [Line Items]          
Interest Expense $ 166,000us-gaap_InterestExpense
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
$ 0us-gaap_InterestExpense
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember