Note 20 - Parent Company Only Financial Statements - Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands			1 Months Ended		12 Months Ended
	Nov. 30, 2022	Apr. 01, 2022	Nov. 30, 2022	Nov. 30, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net income					$ 99,066	$ 98,905	$ 60,582
Deferred income taxes					(4,682)	15,272	(14,530)
Accretion of acquisition fair value adjustments, net					(8,581)	(1,340)	(3,271)
Depreciation					7,662	5,359	5,333
Deferred compensation expense accrued					4,062	4,580	3,821
Stock-based compensation expense					2,438	2,352	2,150
Securities gains, net						88	(2,484)
Goodwill impairment	$ 0		$ 0	$ 0			500
Loss on liability extinguishment, net							3,907
Net increase (decrease) in interest-bearing deposits at financial institutions					25,066	11,304	61,295
Purchases					(230,501)	(173,204)	(356,127)
Calls, maturities and redemptions					43,638	106,442	53,007
Sales					111,375	23,874	38,562
Net cash paid for acquisition					(26,871)
Purchase of premises and equipment					(33,261)	(13,981)	(4,268)
Net cash provided by (used in) investing activities					(634,692)	(411,771)	(704,482)
Proceeds from subordinated notes		$ 20,000			100,000		50,000
Proceeds from issuance of common stock, net					422	670	1,360
Repurchase and cancellation of shares					(52,954)	(14,168)	(3,779)
Net cash provided by (used in) financing activities					538,226	299,714	577,380
Net increase (decrease) in cash and due from banks					22,233	(23,839)	(14,925)
Parent Company [Member] | Reportable Legal Entities [Member]
Net income					99,066	98,905	60,582
Deferred income taxes					(2,443)	(1,093)	6,909
Accretion of acquisition fair value adjustments, net					137	321	378
Depreciation					477	486	454
Deferred compensation expense accrued					4,062	573
Stock-based compensation expense					2,438	2,352	2,150
Loss (gain) on sale of subsidiary/certain assets and liabilities of subsidiary							158
Gain on sale of fixed assets						155
Goodwill impairment							500
Decrease (increase) in other assets					621	5	(7,380)
Increase (decrease) in other liabilities					10,827	(14,702)	(5,923)
Net cash provided by (used in) operating activities					20,990	(30,832)	(21,495)
Net increase (decrease) in interest-bearing deposits at financial institutions					5,950	1,450	(1,599)
Net cash received in dissolution of subsidiary							8,450
Net cash paid for acquisition					(26,039)
Net cash received in sale of subsidiary							195
Purchase of premises and equipment					(1,484)	(31)	(272)
Net cash provided by (used in) investing activities					(21,873)	1,044	6,774
Proceeds from subordinated notes					100,000		50,000
Payment of cash dividends on common and preferred stock					(3,944)	(3,793)	(3,779)
Proceeds from issuance of common stock, net					422	670	1,360
Repurchase and cancellation of shares					(52,954)	(14,168)	(3,779)
Net cash provided by (used in) financing activities					43,524	(17,291)	43,802
Net increase (decrease) in cash and due from banks					42,641	(47,079)	29,081
Cash and due from banks, beginning					41,531	88,610	59,529
Cash and due from banks, ending					84,172	41,531	88,610
Parent Company [Member] | Reportable Legal Entities [Member] | Bank Subsidiaries [Member]
Earnings of bank subsidiaries					(128,941)	(117,408)	(79,624)
Parent Company [Member] | Reportable Legal Entities [Member] | Non-bank Subsidiaries [Member]
Earnings of bank subsidiaries					(1,294)	(456)	261
Distributions from bank subsidiaries					40	30	$ 40
Parent Company [Member] | Reportable Legal Entities [Member] | Bank Subsidiaries [Member]
Distributions from bank subsidiaries					36,000
Parent Company [Member] | Reportable Legal Entities [Member] | Non-bank Subsidiaries [Member]
Capital infusion to subsidiaries					$ (300)	$ (375)