Note 21 - Parent Company Only Financial Statements - Condensed Statements of Income (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended								12 Months Ended
	Nov. 30, 2020	Nov. 30, 2020	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Total interest income			$ 49,851	$ 50,890	$ 48,650	$ 48,982	$ 52,977	$ 56,817	$ 54,181	$ 52,101
Securities gains											$ 2,484	$ (30)
Revenue											312,171	294,844	$ 224,420
Total interest expense			6,144	6,309	7,694	11,276	13,058	16,098	16,168	15,193	31,423	60,517	40,484
Salaries and employee benefits											96,268	92,063	68,994
Acquisition costs													1,795
Post-acquisition compensation, transition and integration costs											214	3,582	2,086
Disposition costs											690	3,325
Goodwill impairment	$ 0	$ 0									500	3,000
Income tax benefit			(4,009)	(4,016)	(2,798)	(1,884)	(6,560)	(3,573)	(3,073)	(1,413)	(12,707)	(14,619)	(9,015)
Net income			$ 18,271	$ 17,344	$ 13,739	$ 11,228	$ 15,891	$ 15,095	$ 13,504	$ 12,918	60,582	57,408	43,120
Parent Company [Member] | Reportable Legal Entities [Member]
Total interest income											29	77	88
Other											289	314	(322)
Revenue											79,681	77,154	54,539
Total interest expense											6,662	5,836	3,637
Salaries and employee benefits											11,825	8,739	6,598
Professional fees											2,558	1,545	1,872
Acquisition costs													1,654
Post-acquisition compensation, transition and integration costs											145	3,171	165
Disposition costs											312	1,606
Goodwill impairment											500	3,000
Other											2,505	2,147	1,026
Total expenses											24,507	26,044	14,952
Income before income tax benefit											55,174	51,110	39,587
Income tax benefit											5,408	6,298	3,533
Net income											60,582	57,408	43,120
Parent Company [Member] | Reportable Legal Entities [Member] | Bank Subsidiaries [Member]
Equity in net income of bank subsidiaries											79,624	69,966	55,209
Parent Company [Member] | Reportable Legal Entities [Member] | Non-bank Subsidiaries [Member]
Equity in net income of bank subsidiaries											$ (261)	$ 6,797	$ (436)