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Note 8 - Investment Securities - Temporarily Impaired Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Temporarily impaired securities, less than 12 months, fair value | $ 599,405 | $ 769,045
Temporarily impaired securities, less than 12 months, unrealized losses | 10,982 | 39,023
Temporarily impaired securities, 12 months or longer, fair value | 816,890 | 562,156
Temporarily impaired securities, 12 months or longer, unrealized losses | 131,299 | 110,492
Temporarily impaired securities, total fair value | 1,416,295 | 1,331,201
Temporarily impaired securities, total unrealized losses | 142,281 | 149,515
US Treasury Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 272,038 | 240,500
Temporarily impaired securities, less than 12 months, unrealized losses | 447 | 1,111
Temporarily impaired securities, 12 months or longer, fair value | 0 | 0
Temporarily impaired securities, 12 months or longer, unrealized losses | 0 | 0
Temporarily impaired securities, total fair value | 272,038 | 240,500
Temporarily impaired securities, total unrealized losses | 447 | 1,111
US Government Corporations and Agencies Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 15,885 | 0
Temporarily impaired securities, less than 12 months, unrealized losses | 8 | 0
Temporarily impaired securities, 12 months or longer, fair value | 1,542 | 1,806
Temporarily impaired securities, 12 months or longer, unrealized losses | 124 | 121
Temporarily impaired securities, total fair value | 17,427 | 1,806
Temporarily impaired securities, total unrealized losses | 132 | 121
US Government-sponsored Enterprises Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 33,614 |
Temporarily impaired securities, less than 12 months, unrealized losses | 95 |
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 | 33,614 |
Temporarily impaired securities, total unrealized losses | 95 |
Collateralized Mortgage-Backed Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 122,348 | 394,123
Temporarily impaired securities, less than 12 months, unrealized losses | 6,039 | 33,042
Temporarily impaired securities, 12 months or longer, fair value | 689,736 | 452,739
Temporarily impaired securities, 12 months or longer, unrealized losses | 115,033 | 93,941
Temporarily impaired securities, total fair value | 812,084 | 846,862
Temporarily impaired securities, total unrealized losses | 121,072 | 126,983
Collateralized Mortgage Obligations [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 23,251 | 24,427
Temporarily impaired securities, less than 12 months, unrealized losses | 1,662 | 1,614
Temporarily impaired securities, 12 months or longer, fair value | 6,252 | 6,634
Temporarily impaired securities, 12 months or longer, unrealized losses | 1,886 | 1,877
Temporarily impaired securities, total fair value | 29,503 | 31,061
Temporarily impaired securities, total unrealized losses | 3,548 | 3,491
Corporate Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 122,562 | 109,995
Temporarily impaired securities, less than 12 months, unrealized losses | 2,438 | 3,256
Temporarily impaired securities, 12 months or longer, fair value | 119,360 | 100,977
Temporarily impaired securities, 12 months or longer, unrealized losses | 14,256 | 14,553
Temporarily impaired securities, total fair value | 241,922 | 210,972
Temporarily impaired securities, total unrealized losses | 16,694 | $ 17,809
Debt Security, Corporate, Non-US [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 9,707 |
Temporarily impaired securities, less than 12 months, unrealized losses | 293 |
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 | 9,707 |
Temporarily impaired securities, total unrealized losses | $ 293 |

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