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Note 8 - Investment Securities - Investment Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Investment securities available for sale, amortized cost | $ 1,629,357 | $ 1,622,173
Investment securities available for sale, gross unrealized gains | 245 | 690
Investment securities available for sale, gross unrealized losses | 142,281 | 149,515
Securities available-for-sale | 1,487,321 | 1,473,348
US Treasury Securities [Member] |  |
Investment securities available for sale, amortized cost | 272,485 | 241,611
Investment securities available for sale, gross unrealized gains | 0 | 0
Investment securities available for sale, gross unrealized losses | 447 | 1,111
Securities available-for-sale | 272,038 | 240,500
US Government Corporations and Agencies Securities [Member] |  |
Investment securities available for sale, amortized cost | 55,485 | 63,347
Investment securities available for sale, gross unrealized gains | 190 | 384
Investment securities available for sale, gross unrealized losses | 132 | 121
Securities available-for-sale | 55,543 | 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 | 95 | 0
Securities available-for-sale | 33,614 | 30,000
Collateralized Mortgage-Backed Securities [Member] |  |
Investment securities available for sale, amortized cost | 943,270 | 993,883
Investment securities available for sale, gross unrealized gains | 46 | 194
Investment securities available for sale, gross unrealized losses | 121,072 | 126,983
Securities available-for-sale | 822,244 | 867,094
Collateralized Mortgage Obligations [Member] |  |
Investment securities available for sale, amortized cost | 33,051 | 34,552
Investment securities available for sale, gross unrealized gains | 0 | 0
Investment securities available for sale, gross unrealized losses | 3,548 | 3,491
Securities available-for-sale | 29,503 | 31,061
Corporate Debt Securities [Member] |  |
Investment securities available for sale, amortized cost | 268,616 | 258,780
Investment securities available for sale, gross unrealized gains | 6 | 112
Investment securities available for sale, gross unrealized losses | 16,694 | 17,809
Securities available-for-sale | 251,928 | $ 241,083
Debt Security, Corporate, Non-US [Member] |  |
Investment securities available for sale, amortized cost | 22,741 |
Investment securities available for sale, gross unrealized gains | 3 |
Investment securities available for sale, gross unrealized losses | 293 |
Securities available-for-sale | $ 22,451 |

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