Note 21 - Parent Company Only Financial Statements - Condensed Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash and due from banks	$ 97,123	$ 59,723
Premises and equipment, net	123,277	117,948
Other assets	224,975	186,418
Total assets	8,538,894	7,948,837	$ 6,096,132
Subordinated notes	233,064	232,662
Junior subordinated debentures	48,731	48,602
Other liabilities	204,263	165,301
Total liabilities	7,652,298	7,176,113
Common stock	16,749	16,796
Additional paid-in capital	370,814	370,712
Retained earnings	554,992	450,114
Total stockholders' equity	886,596	772,724	$ 677,010	$ 593,793
Total liabilities and stockholders' equity	8,538,894	7,948,837
Reportable Legal Entities [Member] | Parent Company [Member]
Cash and due from banks	53,331	84,172
Premises and equipment, net	9,286	9,639
Other assets	14,512	10,157
Total assets	1,206,061	1,077,137
Subordinated notes	233,064	232,662
Junior subordinated debentures	48,731	48,602
Other liabilities	37,670	23,149
Total liabilities	319,465	304,413
Common stock	16,749	16,796
Additional paid-in capital	370,814	370,712
Retained earnings	554,992	450,114
Accumulated other comprehensive income (loss)	(55,959)	(64,898)
Total stockholders' equity	886,596	772,724
Total liabilities and stockholders' equity	1,206,061	1,077,137
Reportable Legal Entities [Member] | Parent Company [Member] | Bank Subsidiaries [Member]
Investment in bank subsidiaries	1,122,803	965,973
Reportable Legal Entities [Member] | Parent Company [Member] | Non-bank Subsidiaries [Member]
Investment in bank subsidiaries	$ 6,129	$ 7,196