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Note 7 - Investment Securities - Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Investment securities available for sale, amortized cost | $ 1,783,915 | $ 1,726,080
Investment securities available for sale, gross unrealized gains | 162 | 515
Investment securities available for sale, gross unrealized losses | 130,910 | 122,025
Securities AFS | 1,653,167 | 1,604,570
US Treasury Securities [Member] |  |
Investment securities available for sale, amortized cost | 541,914 | 495,167
Investment securities available for sale, gross unrealized gains | 4 | 153
Investment securities available for sale, gross unrealized losses | 120 | 20
Securities AFS | 541,798 | 495,300
US Government Corporations and Agencies Securities [Member] |  |
Investment securities available for sale, amortized cost | 12,123 | 48,282
Investment securities available for sale, gross unrealized gains | 61 | 117
Investment securities available for sale, gross unrealized losses | 126 | 230
Securities AFS | 12,058 | 48,169
US Government-sponsored Enterprises Debt Securities [Member] |  |
Investment securities available for sale, amortized cost | 59,785 |
Investment securities available for sale, gross unrealized gains | 0 |
Investment securities available for sale, gross unrealized losses | 40 |
Securities AFS | 59,745 |
Collateralized Mortgage-Backed Securities [Member] |  |
Investment securities available for sale, amortized cost | 871,231 | 892,942
Investment securities available for sale, gross unrealized gains | 63 | 223
Investment securities available for sale, gross unrealized losses | 117,132 | 106,442
Securities AFS | 754,162 | 786,723
Collateralized Mortgage Obligations [Member] |  |
Investment securities available for sale, amortized cost | 30,494 | 31,238
Investment securities available for sale, gross unrealized gains | 0 | 0
Investment securities available for sale, gross unrealized losses | 3,296 | 3,194
Securities AFS | 27,198 | 28,044
Corporate Debt Securities [Member] |  |
Investment securities available for sale, amortized cost | 268,368 | 258,451
Investment securities available for sale, gross unrealized gains | 34 | 22
Investment securities available for sale, gross unrealized losses | 10,196 | 12,139
Securities AFS | $ 258,206 | $ 246,334

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