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Note 8 - Loans - Components of Loans in Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Loans held for investment	$ 19,353,003	$ 19,375,955
Less: Allowance for loan losses	(173,936)	(161,765)	$ (154,589)	$ (154,562)
Unamortized deferred loan fees, net	(11,657)	(10,541)
Loans held for investment, net	19,167,410	19,203,649
Loans held for sale	11,759	0
Commercial Portfolio Segment [Member]
Loans held for investment	2,998,423	3,098,004
Less: Allowance for loan losses	(69,023)	(57,796)	(51,290)	(53,791)
Loans held for sale	11,700
Real Estate Construction Portfolio Segment [Member]
Loans held for investment	332,729	319,649
Less: Allowance for loan losses	(8,540)	(8,185)	(8,539)	(8,180)
Commercial Real Estate Portfolio Segment [Member]
Loans held for investment	10,160,934	10,033,830
Less: Allowance for loan losses	(80,901)	(79,597)	(77,049)	(74,428)
Residential Portfolio Segment [Member]
Loans held for investment	5,623,564	5,689,097
Equity Lines Portfolio Segment [Member]
Loans held for investment	231,184	229,995
Installment and Other Loans [Member ]
Loans held for investment	6,169	5,380
Less: Allowance for loan losses	$ (17)	$ (6)	$ (10)	$ (23)

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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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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