Acquisition (Details) - Schedule of Operating Results Attributable to Business Combinations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Acquisition (Details) - Schedule of Operating Results Attributable to Business Combinations [Line Items]
Net interest income	$ 27,546	$ 11,722	$ 50,820	$ 34,320
Noninterest income	1,173	1,543	5,422	5,095
Net income	1,766	5,094	10,542	14,941	19,925
Legacy ConnectOne [Member]
Acquisition (Details) - Schedule of Operating Results Attributable to Business Combinations [Line Items]
Net interest income			78,872	71,091
Noninterest income			6,168	5,948
Noninterest expense			(41,073)	(34,352)
Net income			$ 26,490	$ 26,125
Pro forma earnings per share from continuing operations:
Basic (in Dollars per share)			$ 0.89	$ 0.91
Diluted (in Dollars per share)			$ 0.88	$ 0.90