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Note 9 - Loans - Components of Loans in Consolidated Balance Sheets (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Loans | $ 18,317,339 | $ 18,254,024 |  |
Less: Allowance for loan losses | (144,884) | (146,485) | $ (145,786) | $ (136,157)
Unamortized deferred loan fees, net | (5,872) | (6,641) |  |
Loans, net | 18,166,583 | 18,100,898 |  |
Commercial Portfolio Segment [Member] |  |  |  |
Loans | 3,153,039 | 3,318,778 |  |
Less: Allowance for loan losses | (45,975) | (49,435) | (44,738) | (43,394)
Real Estate Construction Portfolio Segment [Member] |  |  |  |
Loans | 558,967 | 559,372 |  |
Less: Allowance for loan losses | (10,900) | (10,417) | (7,436) | (6,302)
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Loans | 8,916,766 | 8,793,685 |  |
Less: Allowance for loan losses | (70,367) | (68,366) | (63,878) | (61,081)
Residential Portfolio Segment [Member] |  |  |  |
Loans | 5,384,220 | 5,252,952 |  |
Equity Lines Portfolio Segment [Member] |  |  |  |
Loans | 298,630 | 324,548 |  |
Installment and Other Loans [Member ] |  |  |  |
Loans | 5,717 | 4,689 |  |
Less: Allowance for loan losses | $ (9) | $ (35) | $ (104) | $ (1)

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