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Note 7 - Investment Securities - Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Investment securities available for sale, amortized cost | $ 1,535,896 | $ 1,668,661
Investment securities available for sale, gross unrealized gains | 557 | 512
Investment securities available for sale, gross unrealized losses | 102,413 | 122,045
Securities AFS | 1,434,040 | 1,547,128
US Treasury Securities [Member] |  |
Investment securities available for sale, amortized cost | 541,663 | 621,212
Investment securities available for sale, gross unrealized gains | 10 | 250
Investment securities available for sale, gross unrealized losses | 29 | 0
Securities AFS | 541,644 | 621,462
US Government Corporations and Agencies Securities [Member] |  |
Investment securities available for sale, amortized cost | 8,787 | 9,226
Investment securities available for sale, gross unrealized gains | 50 | 50
Investment securities available for sale, gross unrealized losses | 114 | 127
Securities AFS | 8,723 | 9,149
Collateralized Mortgage-Backed Securities [Member] |  |
Investment securities available for sale, amortized cost | 775,132 | 797,145
Investment securities available for sale, gross unrealized gains | 337 | 67
Investment securities available for sale, gross unrealized losses | 95,794 | 113,196
Securities AFS | 679,675 | 684,016
Collateralized Mortgage Obligations [Member] |  |
Investment securities available for sale, amortized cost | 26,949 | 27,747
Investment securities available for sale, gross unrealized gains | 0 | 0
Investment securities available for sale, gross unrealized losses | 2,286 | 3,191
Securities AFS | 24,663 | 24,556
Corporate Debt Securities [Member] |  |
Investment securities available for sale, amortized cost | 183,365 | 213,331
Investment securities available for sale, gross unrealized gains | 160 | 145
Investment securities available for sale, gross unrealized losses | 4,190 | 5,531
Securities AFS | $ 179,335 | $ 207,945

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