Note 21 - Segment and Related Information - Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Interest income	$ 95,796	$ 95,840	$ 92,855
Interest expense	5,405	12,020	15,728
Noninterest income	21,031	16,843	15,170
Noninterest expense	59,008	54,565	66,074
Income before income taxes	55,239	37,182	25,767
Net income	43,526	30,045	20,906
Depreciation and amortization	3,707	3,825	3,462
Total assets	3,334,597	3,050,010	2,478,550
Goodwill	85,048	85,048	84,002
Capital expenditures	1,000	2,694	3,555
Community Banking [Member] | Operating Segments [Member]
Interest income	95,796	95,840	92,855
Interest expense	5,405	12,020	15,728
Noninterest income	15,012	12,054	10,602
Noninterest expense	56,251	52,245	63,794
Income before income taxes	51,977	34,714	23,479
Net income	40,949	28,052	19,050
Depreciation and amortization	3,697	3,815	3,454
Total assets	3,334,347	3,049,779	2,478,478
Goodwill	85,048	85,048	84,002
Capital expenditures	1,000	2,690	3,534
Trust and Investment Services [Member] | Operating Segments [Member]
Interest income	0	0	0
Interest expense	0	0	0
Noninterest income	6,019	4,789	4,568
Noninterest expense	2,757	2,320	2,280
Income before income taxes	3,262	2,468	2,288
Net income	2,577	1,993	1,856
Depreciation and amortization	10	10	8
Total assets	250	231	72
Goodwill	0	0	0
Capital expenditures	$ 0	$ 4	$ 21