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Note 4 - Investment Securities - Temporarily Impaired Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Temporarily impaired securities, less than 12 months, fair value | $ 132,580 | $ 769,045
Temporarily impaired securities, less than 12 months, unrealized losses | 680 | 39,023
Temporarily impaired securities, 12 months or longer, fair value | 964,495 | 562,156
Temporarily impaired securities, 12 months or longer, unrealized losses | 121,345 | 110,492
Temporarily impaired securities, total fair value | 1,097,075 | 1,331,201
Temporarily impaired securities, total unrealized losses | 122,025 | 149,515
US Treasury Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 49,831 | 240,500
Temporarily impaired securities, less than 12 months, unrealized losses | 20 | 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 | 49,831 | 240,500
Temporarily impaired securities, total unrealized losses | 20 | 1,111
US Government Corporations and Agencies Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 18,301 | 0
Temporarily impaired securities, less than 12 months, unrealized losses | 108 | 0
Temporarily impaired securities, 12 months or longer, fair value | 1,313 | 1,806
Temporarily impaired securities, 12 months or longer, unrealized losses | 122 | 121
Temporarily impaired securities, total fair value | 19,614 | 1,806
Temporarily impaired securities, total unrealized losses | 230 | 121
Collateralized Mortgage-Backed Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 0 | 394,123
Temporarily impaired securities, less than 12 months, unrealized losses | 0 | 33,042
Temporarily impaired securities, 12 months or longer, fair value | 768,274 | 452,739
Temporarily impaired securities, 12 months or longer, unrealized losses | 106,442 | 93,941
Temporarily impaired securities, total fair value | 768,274 | 846,862
Temporarily impaired securities, total unrealized losses | 106,442 | 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 | 28,044 | 6,634
Temporarily impaired securities, 12 months or longer, unrealized losses | 3,194 | 1,877
Temporarily impaired securities, total fair value | 28,044 | 31,061
Temporarily impaired securities, total unrealized losses | 3,194 | 3,491
Corporate Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 64,448 | 109,995
Temporarily impaired securities, less than 12 months, unrealized losses | 552 | 3,256
Temporarily impaired securities, 12 months or longer, fair value | 166,864 | 100,977
Temporarily impaired securities, 12 months or longer, unrealized losses | 11,587 | 14,553
Temporarily impaired securities, total fair value | 231,312 | 210,972
Temporarily impaired securities, total unrealized losses | $ 12,139 | $ 17,809

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