Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2016	Nov. 04, 2016
Document And Entity Information
Entity Registrant Name	ConnectOne Bancorp, Inc.
Entity Central Index Key	0000712771
Document Type	10-Q
Document Period End Date	Sep. 30, 2016
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		30,265,407
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2016