Note 14 - Segment and Related Information - Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Interest income	$ 24,204	$ 23,866
Interest expense	1,781	3,947
Noninterest income	5,922	4,495
Noninterest expense	14,065	13,334
Income before income taxes	14,280	10,127
Net income	11,289	8,542
Depreciation and amortization	961	948
Total assets	3,073,432	2,495,065	$ 3,050,010
Goodwill	85,048	85,048	$ 85,048
Capital expenditures	246	907
Community Banking [Member] | Operating Segments [Member]
Interest income	24,204	23,866
Interest expense	1,781	3,947
Noninterest income	4,498	3,272
Noninterest expense	13,401	12,721
Income before income taxes	13,520	9,517
Net income	10,688	8,027
Depreciation and amortization	958	945
Total assets	3,073,188	2,494,942
Goodwill	85,048	85,048
Capital expenditures	246	903
Trust and Investment Services [Member] | Operating Segments [Member]
Interest income	0	0
Interest expense	0	0
Noninterest income	1,424	1,223
Noninterest expense	664	613
Income before income taxes	760	610
Net income	601	515
Depreciation and amortization	3	3
Total assets	244	123
Goodwill	0	0
Capital expenditures	$ 0	$ 4