Loans and the Allowance for Loan Losses (Details) - Schedule of accretable yield, or income expected to be collected (USD $) In Thousands, unless otherwise specified	3 Months Ended
Sep. 30, 2014
Schedule of accretable yield, or income expected to be collected [Abstract]
Balance at July 1	$ 5,013
Accretion of income	(76)
Balance at September 30	$ 4,937

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