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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)

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