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Note 7 - Investment Securities - Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Investment securities available for sale, amortized cost | $ 1,602,696 | $ 1,726,080
Investment securities available for sale, gross unrealized gains | 1,249 | 515
Investment securities available for sale, gross unrealized losses | 95,589 | 122,025
Securities AFS | 1,508,356 | 1,604,570
US Treasury Securities [Member] |  |
Investment securities available for sale, amortized cost | 494,517 | 495,167
Investment securities available for sale, gross unrealized gains | 494 | 153
Investment securities available for sale, gross unrealized losses | 0 | 20
Securities AFS | 495,011 | 495,300
US Government Corporations and Agencies Securities [Member] |  |
Investment securities available for sale, amortized cost | 10,180 | 48,282
Investment securities available for sale, gross unrealized gains | 61 | 117
Investment securities available for sale, gross unrealized losses | 116 | 230
Securities AFS | 10,125 | 48,169
Collateralized Mortgage-Backed Securities [Member] |  |
Investment securities available for sale, amortized cost | 821,023 | 892,942
Investment securities available for sale, gross unrealized gains | 395 | 223
Investment securities available for sale, gross unrealized losses | 86,882 | 106,442
Securities AFS | 734,536 | 786,723
Collateralized Mortgage Obligations [Member] |  |
Investment securities available for sale, amortized cost | 28,663 | 31,238
Investment securities available for sale, gross unrealized gains | 0 | 0
Investment securities available for sale, gross unrealized losses | 2,229 | 3,194
Securities AFS | 26,434 | 28,044
Corporate Debt Securities [Member] |  |
Investment securities available for sale, amortized cost | 248,313 | 258,451
Investment securities available for sale, gross unrealized gains | 299 | 22
Investment securities available for sale, gross unrealized losses | 6,362 | 12,139
Securities AFS | $ 242,250 | $ 246,334

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