Note 20 - Parent Company Only Financial Statements - Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands				1 Months Ended		12 Months Ended
	Nov. 30, 2021	Sep. 14, 2020	Feb. 12, 2019	Nov. 30, 2021	Nov. 30, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net income						$ 98,905	$ 60,582	$ 57,408
Deferred income taxes						15,272	(14,530)	6,364
Accretion of acquisition fair value adjustments, net						(1,340)	(3,271)	(4,344)
Depreciation						5,359	5,333	5,225
Deferred compensation expense accrued						4,580	3,821	2,773
Stock-based compensation expense						2,352	2,150	2,469
Loss (gain) on sale of subsidiary/certain assets and liabilities of subsidiary								(12,286)
Securities gains, net						88	(2,484)	30
Goodwill impairment	$ 0			$ 0	$ 0		500	3,000
Loss on liability extinguishment, net							3,907	436
Net increase (decrease) in interest-bearing deposits at financial institutions						11,304	61,295	(69,984)
Purchases						(173,204)	(356,127)	(71,963)
Calls, maturities and redemptions						106,442	53,007	25,193
Sales						23,874	38,562	30,055
Purchase of premises and equipment						(13,981)	(4,268)	(12,429)
Net cash provided by (used in) investing activities						(411,771)	(704,482)	(308,664)
Paydown of revolving line of credit								9,000
Prepayments								(46,313)
Calls, maturities and scheduled principal payments								(11,937)
Proceeds from subordinated notes		$ 50,000	$ 63,400				50,000	63,393
Proceeds from issuance of common stock, net						670	1,360	1,926
Repurchase and cancellation of shares						(14,168)	(3,779)
Net cash provided by (used in) financing activities						299,714	577,380	222,901
Net decrease in cash and due from banks						(23,839)	(14,925)	(9,269)
Parent Company [Member] | Reportable Legal Entities [Member]
Net income						98,905	60,582	57,408
Deferred income taxes						(1,093)	6,909	2,498
Accretion of acquisition fair value adjustments, net						321	378	305
Depreciation						486	454	327
Deferred compensation expense accrued						573
Stock-based compensation expense						2,352	2,150	2,469
Loss (gain) on sale of subsidiary/certain assets and liabilities of subsidiary							158
Gain on sale of fixed assets						155
Goodwill impairment							500	3,000
Decrease (increase) in other assets						5	(7,380)	(2,472)
Increase (decrease) in other liabilities						(14,702)	(5,923)	7,814
Net cash provided by (used in) operating activities						(30,832)	(21,495)	39,644
Net increase (decrease) in interest-bearing deposits at financial institutions						1,450	(1,599)	(4,600)
Net cash received in dissolution of subsidiary							8,450
Net cash received in sale of subsidiary							195
Purchase of premises and equipment						(31)	(272)	(2,861)
Net cash provided by (used in) investing activities						1,044	6,774	(16,161)
Paydown of revolving line of credit								(9,000)
Prepayments								(21,313)
Calls, maturities and scheduled principal payments								(1,799)
Proceeds from subordinated notes							50,000	63,393
Payment of cash dividends on common and preferred stock						(3,793)	(3,779)	(3,767)
Proceeds from issuance of common stock, net						670	1,360	1,926
Repurchase and cancellation of shares						(14,168)	(3,779)
Net cash provided by (used in) financing activities						(17,291)	43,802	29,440
Net increase (decrease) in cash and due from banks						(47,079)	29,081	52,923
Cash and due from banks, beginning						88,610	59,529	6,606
Cash and due from banks, ending						41,531	88,610	59,529
Parent Company [Member] | Reportable Legal Entities [Member] | Bank Subsidiaries [Member]
Earnings of bank subsidiaries						(117,408)	(79,624)	(69,966)
Parent Company [Member] | Reportable Legal Entities [Member] | Non-bank Subsidiaries [Member]
Earnings of bank subsidiaries						(456)	261	(6,797)
Distributions from bank subsidiaries						30	$ 40	45,058
Parent Company [Member] | Reportable Legal Entities [Member] | Bank Subsidiaries [Member]
Capital infusion to subsidiaries								(8,600)
Parent Company [Member] | Reportable Legal Entities [Member] | Non-bank Subsidiaries [Member]
Capital infusion to subsidiaries						$ (375)		$ (100)