Note 20 - Parent Company Only Financial Statements - Condensed Statements of Income (Details) - USD ($) $ in Thousands		1 Months Ended		12 Months Ended
	Nov. 30, 2021	Nov. 30, 2021	Nov. 30, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Securities gains				$ (88)	$ 2,484	$ (30)
Revenue				300,577	312,171	294,844
Total interest expense				21,922	31,423	60,517
Salaries and employee benefits				100,907	96,268	92,063
Acquisition costs				624
Post-acquisition compensation, transition and integration costs					214	3,582
Disposition costs				13	690	3,325
Goodwill impairment	$ 0	$ 0	$ 0		500	3,000
Income before taxes				121,467	73,289	72,027
Income tax benefit				(22,562)	(12,707)	(14,619)
Net income				98,905	60,582	57,408
Parent Company [Member] | Reportable Legal Entities [Member]
Total interest income				3	29	77
Other				853	289	314
Revenue				118,720	79,681	77,154
Total interest expense				8,482	6,662	5,836
Salaries and employee benefits				12,446	11,825	8,739
Professional fees				1,983	2,558	1,545
Acquisition costs				624
Post-acquisition compensation, transition and integration costs					145	3,171
Disposition costs				13	312	1,606
Goodwill impairment					500	3,000
Other				2,784	2,505	2,147
Total expenses				26,332	24,507	26,044
Income before taxes				92,388	55,174	51,110
Income tax benefit				6,517	5,408	6,298
Net income				98,905	60,582	57,408
Parent Company [Member] | Reportable Legal Entities [Member] | Bank Subsidiaries [Member]
Equity in net income (loss) of bank subsidiaries				117,408	79,624	69,966
Parent Company [Member] | Reportable Legal Entities [Member] | Non-bank Subsidiaries [Member]
Equity in net income (loss) of bank subsidiaries				$ 456	$ (261)	$ 6,797