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Note 8 - Investment Securities - Temporarily Impaired Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Temporarily impaired securities, less than 12 months, fair value | $ 196,414 | $ 769,045
Temporarily impaired securities, less than 12 months, unrealized losses | 2,649 | 39,023
Temporarily impaired securities, 12 months or longer, fair value | 986,143 | 562,156
Temporarily impaired securities, 12 months or longer, unrealized losses | 173,731 | 110,492
Temporarily impaired securities, total fair value | 1,182,557 | 1,331,201
Temporarily impaired securities, total unrealized losses | 176,380 | 149,515
US Treasury Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 49,153 | 240,500
Temporarily impaired securities, less than 12 months, unrealized losses | 126 | 1,111
Temporarily impaired securities, 12 months or longer, fair value | 49,804 | 0
Temporarily impaired securities, 12 months or longer, unrealized losses | 29 | 0
Temporarily impaired securities, total fair value | 98,957 | 240,500
Temporarily impaired securities, total unrealized losses | 155 | 1,111
US Government Corporations and Agencies Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 17,698 | 0
Temporarily impaired securities, less than 12 months, unrealized losses | 39 | 0
Temporarily impaired securities, 12 months or longer, fair value | 1,487 | 1,806
Temporarily impaired securities, 12 months or longer, unrealized losses | 122 | 121
Temporarily impaired securities, total fair value | 19,185 | 1,806
Temporarily impaired securities, total unrealized losses | 161 | 121
Collateralized Mortgage-Backed Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 17,695 | 394,123
Temporarily impaired securities, less than 12 months, unrealized losses | 642 | 33,042
Temporarily impaired securities, 12 months or longer, fair value | 743,568 | 452,739
Temporarily impaired securities, 12 months or longer, unrealized losses | 154,316 | 93,941
Temporarily impaired securities, total fair value | 761,263 | 846,862
Temporarily impaired securities, total unrealized losses | 154,958 | 126,983
Collateralized Mortgage Obligations [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 0 | 24,427
Temporarily impaired securities, less than 12 months, unrealized losses | 0 | 1,614
Temporarily impaired securities, 12 months or longer, fair value | 27,698 | 6,634
Temporarily impaired securities, 12 months or longer, unrealized losses | 4,317 | 1,877
Temporarily impaired securities, total fair value | 27,698 | 31,061
Temporarily impaired securities, total unrealized losses | 4,317 | 3,491
Corporate Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 68,285 | 109,995
Temporarily impaired securities, less than 12 months, unrealized losses | 1,715 | 3,256
Temporarily impaired securities, 12 months or longer, fair value | 163,586 | 100,977
Temporarily impaired securities, 12 months or longer, unrealized losses | 14,947 | 14,553
Temporarily impaired securities, total fair value | 231,871 | 210,972
Temporarily impaired securities, total unrealized losses | 16,662 | $ 17,809
US Government-sponsored Enterprises Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 33,621 |
Temporarily impaired securities, less than 12 months, unrealized losses | 89 |
Temporarily impaired securities, 12 months or longer, fair value | 0 |
Temporarily impaired securities, 12 months or longer, unrealized losses | 0 |
Temporarily impaired securities, total fair value | 33,621 |
Temporarily impaired securities, total unrealized losses | 89 |
Debt Security, Corporate, Non-US [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 9,962 |
Temporarily impaired securities, less than 12 months, unrealized losses | 38 |
Temporarily impaired securities, 12 months or longer, fair value | 0 |
Temporarily impaired securities, 12 months or longer, unrealized losses | 0 |
Temporarily impaired securities, total fair value | 9,962 |
Temporarily impaired securities, total unrealized losses | $ 38 |

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