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Note 8 - Investment Securities - Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Investment securities available for sale, amortized cost | $ 1,684,951 | $ 1,622,173
Investment securities available for sale, gross unrealized gains | 227 | 690
Investment securities available for sale, gross unrealized losses | 176,380 | 149,515
Securities available-for-sale | 1,508,798 | 1,473,348
US Treasury Securities [Member] |  |
Investment securities available for sale, amortized cost | 392,956 | 241,611
Investment securities available for sale, gross unrealized gains | 41 | 0
Investment securities available for sale, gross unrealized losses | 155 | 1,111
Securities available-for-sale | 392,842 | 240,500
US Government Corporations and Agencies Securities [Member] |  |
Investment securities available for sale, amortized cost | 51,018 | 63,347
Investment securities available for sale, gross unrealized gains | 144 | 384
Investment securities available for sale, gross unrealized losses | 161 | 121
Securities available-for-sale | 51,001 | 63,610
US Government-sponsored Enterprises Debt Securities [Member] |  |
Investment securities available for sale, amortized cost | 33,709 | 30,000
Investment securities available for sale, gross unrealized gains | 0 | 0
Investment securities available for sale, gross unrealized losses | 89 | 0
Securities available-for-sale | 33,620 | 30,000
Collateralized Mortgage-Backed Securities [Member] |  |
Investment securities available for sale, amortized cost | 916,719 | 993,883
Investment securities available for sale, gross unrealized gains | 42 | 194
Investment securities available for sale, gross unrealized losses | 154,958 | 126,983
Securities available-for-sale | 761,803 | 867,094
Collateralized Mortgage Obligations [Member] |  |
Investment securities available for sale, amortized cost | 32,015 | 34,552
Investment securities available for sale, gross unrealized gains | 0 | 0
Investment securities available for sale, gross unrealized losses | 4,317 | 3,491
Securities available-for-sale | 27,698 | 31,061
Corporate Debt Securities [Member] |  |
Investment securities available for sale, amortized cost | 248,534 | 258,780
Investment securities available for sale, gross unrealized gains | 0 | 112
Investment securities available for sale, gross unrealized losses | 16,662 | 17,809
Securities available-for-sale | 231,872 | $ 241,083
Debt Security, Corporate, Non-US [Member] |  |
Investment securities available for sale, amortized cost | 10,000 |
Investment securities available for sale, gross unrealized gains | 0 |
Investment securities available for sale, gross unrealized losses | 38 |
Securities available-for-sale | $ 9,962 |

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