Note 13 - Segment and Related Information - Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Interest income	$ 24,277	$ 24,179	$ 71,648	$ 71,342
Interest expense	1,184	2,684	4,361	9,668
Noninterest income	5,123	4,292	16,187	12,622
Noninterest expense	14,843	14,140	43,545	39,906
Income before income taxes	12,891	9,028	40,799	26,059
Net income	10,178	7,227	32,233	21,251
Depreciation and amortization	932	941	2,807	2,844
Total assets	3,289,063	2,864,539	3,289,063	2,864,539	$ 3,050,010
Goodwill	85,048	85,048	85,048	85,048	$ 85,048
Capital expenditures	454	463	833	2,347
Community Banking [Member] | Operating Segments [Member]
Interest income	24,277	24,179	71,648	71,342
Interest expense	1,184	2,684	4,361	9,668
Noninterest income	3,547	2,716	11,697	9,050
Noninterest expense	14,164	13,598	41,529	38,751
Income before income taxes	12,080	8,445	38,326	24,866
Net income	9,537	6,764	30,278	20,273
Depreciation and amortization	929	938	2,798	2,838
Total assets	3,288,849	2,864,361	3,288,849	2,864,361
Goodwill	85,048	85,048	85,048	85,048
Capital expenditures	454	463	833	2,343
Trust and Investment Services [Member] | Operating Segments [Member]
Interest income	0	0	0	0
Interest expense	0	0	0	0
Noninterest income	1,576	1,576	4,490	3,572
Noninterest expense	679	542	2,016	1,155
Income before income taxes	811	583	2,473	1,193
Net income	641	463	1,955	978
Depreciation and amortization	3	3	9	6
Total assets	214	178	214	178
Goodwill	0	0	0	0
Capital expenditures	$ 0	$ 0	$ 0	$ 4