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Note 8 - Loans - Components of Loans in Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Loans held for investment	$ 19,357,524		$ 19,548,140
Less: Allowance for loan losses	(153,404)	$ (154,589)	(154,562)	$ (155,109)	$ (144,884)	$ (146,485)
Unamortized deferred loan fees, net	(10,785)		(10,720)
Loans held for investment, net	19,193,335		19,382,858
Loans held for sale	0		0
Commercial Portfolio Segment [Member]
Loans held for investment	3,090,763		3,305,048
Less: Allowance for loan losses	(48,588)	(51,290)	(53,791)	(50,579)	(45,975)	(49,435)
Real Estate Construction Portfolio Segment [Member]
Loans held for investment	356,978		422,647
Less: Allowance for loan losses	(8,912)	(8,539)	(8,180)	(12,751)	(10,900)	(10,417)
Commercial Real Estate Portfolio Segment [Member]
Loans held for investment	9,886,030		9,729,581
Less: Allowance for loan losses	(78,465)	(77,049)	(74,428)	(73,547)	(70,367)	(68,366)
Residential Portfolio Segment [Member]
Loans held for investment	5,782,202		5,838,747
Equity Lines Portfolio Segment [Member]
Loans held for investment	235,277		245,919
Installment and Other Loans [Member ]
Loans held for investment	6,274		6,198
Less: Allowance for loan losses	$ (23)	$ (10)	$ (23)	$ (18)	$ (9)	$ (35)

X

- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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- Definition

Amortized cost, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

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Amount of unamortized loan commitment, origination, and other costs (fees) and purchase premium (discount) on financing receivable recognized as adjustment to yield. Excludes financing receivable covered under loss sharing agreement.

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Amount, before valuation allowance, of financing receivable classified as held-for-sale.

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