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Note 7 - Investment Securities - Investment Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Investment securities available for sale, amortized cost | $ 1,780,251 | $ 1,726,080
Investment securities available for sale, gross unrealized gains | 154 | 515
Investment securities available for sale, gross unrealized losses | 131,674 | 122,025
Securities AFS | 1,648,731 | 1,604,570
US Treasury Securities [Member] |  |
Investment securities available for sale, amortized cost | 545,093 | 495,167
Investment securities available for sale, gross unrealized gains | 0 | 153
Investment securities available for sale, gross unrealized losses | 93 | 20
Securities AFS | 545,000 | 495,300
US Government Corporations and Agencies Securities [Member] |  |
Investment securities available for sale, amortized cost | 11,063 | 48,282
Investment securities available for sale, gross unrealized gains | 65 | 117
Investment securities available for sale, gross unrealized losses | 118 | 230
Securities AFS | 11,010 | 48,169
US Government-sponsored Enterprises Debt Securities [Member] |  |
Investment securities available for sale, amortized cost | 79,785 |
Investment securities available for sale, gross unrealized gains | 0 |
Investment securities available for sale, gross unrealized losses | 51 |
Securities AFS | 79,734 |
Collateralized Mortgage-Backed Securities [Member] |  |
Investment securities available for sale, amortized cost | 846,407 | 892,942
Investment securities available for sale, gross unrealized gains | 63 | 223
Investment securities available for sale, gross unrealized losses | 117,706 | 106,442
Securities AFS | 728,764 | 786,723
Collateralized Mortgage Obligations [Member] |  |
Investment securities available for sale, amortized cost | 29,551 | 31,238
Investment securities available for sale, gross unrealized gains | 0 | 0
Investment securities available for sale, gross unrealized losses | 3,472 | 3,194
Securities AFS | 26,079 | 28,044
Corporate Debt Securities [Member] |  |
Investment securities available for sale, amortized cost | 268,352 | 258,451
Investment securities available for sale, gross unrealized gains | 26 | 22
Investment securities available for sale, gross unrealized losses | 10,234 | 12,139
Securities AFS | $ 258,144 | $ 246,334

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