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Note 3 - Investment Securities - Investment Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Investment securities available for sale, amortized cost | $ 1,668,661 | $ 1,726,080
Investment securities available for sale, gross unrealized gains | 512 | 515
Investment securities available for sale, gross unrealized losses | 122,045 | 122,025
Securities AFS | 1,547,128 | 1,604,570
US Treasury Securities [Member] |  |
Investment securities available for sale, amortized cost | 621,212 | 495,167
Investment securities available for sale, gross unrealized gains | 250 | 153
Investment securities available for sale, gross unrealized losses | 0 | 20
Securities AFS | 621,462 | 495,300
US Government Corporations and Agencies Securities [Member] |  |
Investment securities available for sale, amortized cost | 9,226 | 48,282
Investment securities available for sale, gross unrealized gains | 50 | 117
Investment securities available for sale, gross unrealized losses | 127 | 230
Securities AFS | 9,149 | 48,169
Collateralized Mortgage-Backed Securities [Member] |  |
Investment securities available for sale, amortized cost | 797,145 | 892,942
Investment securities available for sale, gross unrealized gains | 67 | 223
Investment securities available for sale, gross unrealized losses | 113,196 | 106,442
Securities AFS | 684,016 | 786,723
Collateralized Mortgage Obligations [Member] |  |
Investment securities available for sale, amortized cost | 27,747 | 31,238
Investment securities available for sale, gross unrealized gains | 0 | 0
Investment securities available for sale, gross unrealized losses | 3,191 | 3,194
Securities AFS | 24,556 | 28,044
Corporate Debt Securities [Member] |  |
Investment securities available for sale, amortized cost | 213,331 | 258,451
Investment securities available for sale, gross unrealized gains | 145 | 22
Investment securities available for sale, gross unrealized losses | 5,531 | 12,139
Securities AFS | $ 207,945 | $ 246,334

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