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

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