Loans and the Allowance for Loan and Lease Losses (Details) - Schedule of accretable yield, or income expected to be collected $ in Thousands	6 Months Ended
Jun. 30, 2015 USD ($)
Schedule of accretable yield, or income expected to be collected [Abstract]
Balance at December 31, 2014	$ 4,805
Accretion of income	(127)
Balance at June 30, 2015	$ 4,678

Loans and leases receivable purchased loans accretion of income.

No definition available.

Name:	cnob_LoansAndLeasesReceivablePurchasedLoansAccretionOfIncome
Namespace Prefix:	cnob_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration