Note 9 - Goodwill and Other Intangible Assets - Changes in Goodwill, by Reporting Unit (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended	12 Months Ended
		Oct. 31, 2018	Sep. 30, 2018	Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Balance				$ 95,779	[1]	$ 95,779		$ 100,486
Acquisitions and dispositions, net				(1,543)				(4,707)
Other (1)	[2]
Impairment charges		$ (1,490)	$ (1,490)	(1,492)
Balance				92,744		95,779	[1]	95,779
Community Banking [Member]
Balance				95,779		95,779		91,455
Acquisitions and dispositions, net				(1,543)				1,290
Other (1)	[2]							3,034
Impairment charges				(1,492)
Balance				92,744		95,779		95,779
Insurance Service Segment [Member]
Balance								9,031
Acquisitions and dispositions, net								(5,997)
Other (1)	[2]							(3,034)
Impairment charges
Balance

[1] Derived from audited financial statements

[2] Represents the transfer of goodwill after the sale of Greenpoint to one reporting unit