Note 23 - Condensed Financial Statements of Parent Company - Parent Company Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Equity investments (at fair value)	$ 10,958	$ 29,494
Other investments	21,130	16,029
Premises and equipment, net	63,038	53,981
Other assets	39,466	31,959
Total assets	4,634,322	3,916,692
Subordinated debentures, net	103,782	103,296
Subordinated debentures owed to unconsolidated subsidiary trusts	19,589	19,589
Other liabilities	52,001	42,741
Total liabilities	4,194,114	3,562,162
Preferred stock, $1.00 par value, authorized 250,000 shares; issued: 2023 and 2022 - 1,500 shares	14,920	14,920
Common stock and related surplus, $2.50 par value; authorized 20,000,000 shares; issued and oustanding: 2023 - 14,683,457 shares, 2022 - 12,783,646 shares	129,990	90,696
Retained earnings	302,783	260,393
Accumulated other comprehensive loss	(7,485)	(11,479)
Total shareholders' equity	440,208	354,530	$ 327,473	$ 281,580
Total liabilities and shareholders' equity	4,634,322	3,916,692
Parent Company [Member]
Cash	31,459	11,043
Investment in subsidiaries	531,138	445,048
Equity investments (at fair value)	6,436	25,858
Other investments	82	0
Premises and equipment, net	115	92
Other assets	1,905	1,802
Total assets	571,135	483,843
Subordinated debentures, net	103,782	103,296
Subordinated debentures owed to unconsolidated subsidiary trusts	19,589	19,589
Other liabilities	7,556	6,428
Total liabilities	130,927	129,313
Preferred stock, $1.00 par value, authorized 250,000 shares; issued: 2023 and 2022 - 1,500 shares	14,920	14,920
Common stock and related surplus, $2.50 par value; authorized 20,000,000 shares; issued and oustanding: 2023 - 14,683,457 shares, 2022 - 12,783,646 shares	129,990	90,696
Retained earnings	302,783	260,393
Accumulated other comprehensive loss	(7,485)	(11,479)
Total shareholders' equity	440,208	354,530
Total liabilities and shareholders' equity	$ 571,135	$ 483,843