Note 5 - Loans - Components of Loans in Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Loans	$ 19,548,140	$ 18,254,024
Less: Allowance for loan losses	(154,562)	(146,485)	$ (136,157)
Unamortized deferred loan fees, net	(10,720)	(6,641)
Loans, net	19,382,858	18,100,898
Commercial Portfolio Segment [Member]
Loans	3,305,048	3,318,778
Less: Allowance for loan losses	(53,791)	(49,435)	(43,394)
Real Estate Construction Portfolio Segment [Member]
Loans	422,647	559,372
Less: Allowance for loan losses	(8,180)	(10,417)	(6,302)
Commercial Real Estate Portfolio Segment [Member]
Loans	9,729,581	8,793,685
Less: Allowance for loan losses	(74,428)	(68,366)	(61,081)
Residential Portfolio Segment [Member]
Loans	5,838,747	5,252,952
Equity Lines Portfolio Segment [Member]
Loans	245,919	324,548
Installment and Other Loans [Member ]
Loans	6,198	4,689
Less: Allowance for loan losses	$ (23)	$ (35)	$ (1)