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Accumulated Other Comprehensive Income (Details) - Schedule of accumulated other comprehensive loss (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Schedule of accumulated other comprehensive loss [Abstract]    
Net unrealized gain on investment securities available-for-sale $ 5,491us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax $ 4,874us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Cash flow hedge (288)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax 28us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
Unamortized component of securities transferred from available-for-sale to held-to-maturity (1,263)cnob_AccumulatedOtherComprehensiveIncomeLossUnamortizedComponentOfSecuritiesTransferredFromAvailableForSaleToHeldToMaturityNetOfTax (1,301)cnob_AccumulatedOtherComprehensiveIncomeLossUnamortizedComponentOfSecuritiesTransferredFromAvailableForSaleToHeldToMaturityNetOfTax
Defined benefit pension and post-retirement plans (4,176)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax (4,615)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax
Total accumulated other comprehensive loss $ (236)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ (1,014)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax