Note 13 - Segment and Related Information - Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021	[1]
Interest income	$ 25,151	$ 24,277	$ 69,088	$ 71,648
Interest expense	1,144	1,184	3,138	4,361
Noninterest income	4,760	5,123	15,197	16,187
Noninterest expense	16,448	14,843	47,252	43,545
Income before income taxes	11,704	12,891	33,457	40,799
Net income	9,256	10,178	26,395	32,233
Depreciation and amortization	877	932	2,647	2,807
Total assets	3,049,320	3,289,063	3,049,320	3,289,063	$ 3,334,597
Goodwill	85,048	85,048	85,048	85,048	$ 85,048
Capital expenditures	894	454	894	833
Community Banking [Member] | Operating Segments [Member]
Interest income	25,151	24,277	69,088	71,648
Interest expense	1,144	1,184	3,138	4,361
Noninterest income	3,157	3,547	10,198	11,697
Noninterest expense	15,681	14,164	45,088	41,529
Income before income taxes	10,868	12,080	30,621	38,326
Net income	8,595	9,537	24,158	30,278
Depreciation and amortization	874	929	2,639	2,798
Total assets	3,049,079	3,288,849	3,049,079	3,288,849
Goodwill	85,048	85,048	85,048	85,048
Capital expenditures	894	454	894	833
Trust and Investment Services [Member] | Operating Segments [Member]
Interest income	0	0	0	0
Interest expense	0	0	0	0
Noninterest income	1,603	1,576	4,999	4,490
Noninterest expense	767	679	2,164	2,016
Income before income taxes	836	811	2,836	2,473
Net income	661	641	2,237	1,955
Depreciation and amortization	3	3	8	9
Total assets	241	214	241	214
Goodwill	0	0	0	0
Capital expenditures	$ 0	$ 0	$ 0	$ 0

[1] Derived from audited consolidated financial statements