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STOCK BASED COMPENSATION (Details) - Schedule of Share-based Payment Award, Nonvested Shares (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Schedule of Share-based Payment Award, Nonvested Shares [Abstract]    
Stock based compensation, Nonvested Shares 50,303us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares 18,829us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares
Stock based compensation, Weighted-Average Grant Date Fair Value $ 11.79us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue $ 18.76us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue
Assumed in Merger 52,468cnob_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfSharesAssumedInMerger  
Assumed in Merger $ 11.65cnob_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValueAssumedInMerger  
Vested (20,994)us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares  
Vested $ 17.62us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue