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Loans and the Allowance for Loan and Lease Losses (Details) - Schedule of accretable yield, or income expected to be collected (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Schedule of accretable yield, or income expected to be collected [Abstract]  
Balance at January 1, 2015 $ 4,805cnob_LoansAndLeasesReceivablePurchasedLoans
Accretion of income (54)cnob_LoansAndLeasesReceivablePurchasedLoansAccretionOfIncome
Balance at March 31, 2015 $ 4,751cnob_LoansAndLeasesReceivablePurchasedLoans