Note 21 - Parent Company Only Financial Statements - Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands	1 Months Ended		12 Months Ended
	Nov. 30, 2023	Nov. 30, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net Income (Loss)			$ 113,558	$ 99,066	$ 98,905
Deferred income taxes			(946)	(4,682)	15,272
Accretion of acquisition fair value adjustments, net			(2,173)	(8,581)	(1,340)
Depreciation			8,725	7,662	5,359
Deferred compensation expense accrued			5,677	4,062	4,580
Stock-based compensation expense			2,678	2,438	2,352
Goodwill impairment	$ 0	$ 0
Net decrease in interest-bearing deposits at financial institutions			(37,559)	25,066	11,304
Net cash paid for acquisition				(26,871)
Purchase of premises and equipment			(14,945)	(33,261)	(13,981)
Net cash provided by (used in) investing activities			(749,269)	(634,692)	(411,771)
Proceeds from subordinated notes				100,000
Proceeds from issuance of common stock, net			1,403	422	670
Repurchase and cancellation of shares			(8,686)	(52,954)	(14,168)
Net cash provided by (used in) financing activities			410,346	538,226	299,714
Net increase in cash and due from banks			37,400	22,233	(23,839)
Parent Company [Member] | Reportable Legal Entities [Member]
Net Income (Loss)			113,558	99,066	98,905
Deferred income taxes			(349)	(2,443)	(1,093)
Accretion of acquisition fair value adjustments, net			129	137	321
Depreciation			576	477	486
Deferred compensation expense accrued			4,063	4,062	573
Stock-based compensation expense			2,678	2,438	2,352
Gain on sale of fixed assets					155
Decrease (increase) in other assets			(2,649)	621	5
Increase (decrease) in other liabilities			9,062	10,827	(14,702)
Net cash provided by (used in) operating activities			(12,489)	20,990	(30,832)
Net decrease in interest-bearing deposits at financial institutions				5,950	1,450
Net cash received in dissolution of subsidiary			3,184
Net cash paid for acquisition				(26,039)
Purchase of premises and equipment			(224)	(1,484)	(31)
Net cash provided by (used in) investing activities			(7,040)	(21,873)	1,044
Proceeds from subordinated notes				100,000
Payment of cash dividends			(4,029)	(3,944)	(3,793)
Proceeds from issuance of common stock, net			1,403	422	670
Repurchase and cancellation of shares			(8,686)	(52,954)	(14,168)
Net cash provided by (used in) financing activities			(11,312)	43,524	(17,291)
Net increase in cash and due from banks			(30,841)	42,641	(47,079)
Cash and due from banks, beginning			84,172	41,531	88,610
Cash and due from banks, ending			53,331	84,172	41,531
Parent Company [Member] | Reportable Legal Entities [Member] | Bank Subsidiaries [Member]
Earnings of bank subsidiaries			(137,451)	(128,941)	(117,408)
Parent Company [Member] | Reportable Legal Entities [Member] | Non-bank Subsidiaries [Member]
Earnings of bank subsidiaries			(2,220)	(1,294)	(456)
Distributions from bank subsidiaries			114	40	30
Parent Company [Member] | Reportable Legal Entities [Member] | Bank Subsidiaries [Member]
Distributions from bank subsidiaries				36,000
Capital infusion to subsidiaries			$ (10,000)
Parent Company [Member] | Reportable Legal Entities [Member] | Non-bank Subsidiaries [Member]
Capital infusion to subsidiaries				$ (300)	$ (375)