Note 17 - Segment and Related Information - Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Interest income	$ 23,297	$ 25,211	$ 47,163	$ 43,307
Interest expense	3,037	4,222	6,984	7,250
Total noninterest income	3,835	3,682	8,330	7,133
Income before income taxes	6,904	(1,635)	17,031	5,939
Net income (loss)	5,482	(1,230)	14,024	4,773
Depreciation and amortization	941	1,011	1,889	1,471
Total assets	2,864,539	2,418,082	2,864,539	2,418,082	$ 2,478,550
Goodwill	85,048	84,633	85,048	84,633	$ 84,002
Capital expenditures	463	906	1,370	1,299
Community Banking [Member] | Operating Segments [Member]
Interest income	23,297	25,211	47,163	43,307
Interest expense	3,037	4,222	6,984	7,250
Total noninterest income	2,710	2,563	5,982	4,953
Income before income taxes	6,321	(2,194)	15,838	4,900
Net income (loss)	5,019	(1,685)	13,046	3,938
Depreciation and amortization	938	1,009	1,883	1,467
Total assets	2,864,361	2,418,061	2,864,361	2,418,061
Goodwill	85,048	84,633	85,048	84,633
Capital expenditures	463	906	1,366	1,292
Trust and Investment Services [Member] | Operating Segments [Member]
Interest income	0	0	0	0
Interest expense	0	0	0	0
Total noninterest income	1,125	1,119	2,348	2,180
Income before income taxes	583	559	1,193	1,039
Net income (loss)	463	455	978	835
Depreciation and amortization	3	2	6	4
Total assets	178	21	178	21
Goodwill	0	0	0	0
Capital expenditures	$ 0	$ 0	$ 4	$ 7