Note 20 - Parent Company Only Financial Statements - Condensed Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash and due from banks	$ 59,723	$ 37,490
Interest-bearing deposits at financial institutions	67,360	75,292
Securities available for sale, at fair value	340,960	337,830
Loans/leases receivable held for investment	6,137,391	4,676,304
Premises and equipment, net	117,948	78,530
Other assets	186,418	93,412
Total assets	7,948,837	6,096,132	$ 5,705,043
Subordinated notes	232,662	113,850
Junior subordinated debentures	48,602	38,155
Other liabilities	165,301	100,410
Total liabilities	7,176,113	5,419,122
Common stock	16,796	15,613
Additional paid-in capital	370,712	273,768
Retained earnings	450,114	386,077
Total stockholders' equity	772,724	677,010	$ 593,793	$ 535,351
Total liabilities and stockholders' equity	7,948,837	6,096,132
Reportable Legal Entities [Member] | Parent Company [Member]
Cash and due from banks	84,172	41,531
Interest-bearing deposits at financial institutions		5,750
Premises and equipment, net	9,639	8,632
Other assets	10,157	7,716
Total assets	1,077,137	838,598
Subordinated notes	232,662	113,850
Junior subordinated debentures	48,602	38,155
Other liabilities	23,149	9,583
Total liabilities	304,413	161,588
Common stock	16,796	15,613
Additional paid-in capital	370,712	273,768
Retained earnings	450,114	386,077
Accumulated other comprehensive income (loss)	(64,898)	1,552
Total stockholders' equity	772,724	677,010
Total liabilities and stockholders' equity	1,077,137	838,598
Reportable Legal Entities [Member] | Parent Company [Member] | Bank Subsidiaries [Member]
Investment in bank subsidiaries	965,973	769,628
Reportable Legal Entities [Member] | Parent Company [Member] | Non-bank Subsidiaries [Member]
Investment in bank subsidiaries	$ 7,196	$ 5,341