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Note 8 - Investment Securities - Temporarily Impaired Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Temporarily impaired securities, less than 12 months, fair value | $ 429,082 | $ 769,045
Temporarily impaired securities, less than 12 months, unrealized losses | 8,118 | 39,023
Temporarily impaired securities, 12 months or longer, fair value | 832,385 | 562,156
Temporarily impaired securities, 12 months or longer, unrealized losses | 124,110 | 110,492
Temporarily impaired securities, total fair value | 1,261,467 | 1,331,201
Temporarily impaired securities, total unrealized losses | 132,228 | 149,515
US Treasury Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 172,306 | 240,500
Temporarily impaired securities, less than 12 months, unrealized losses | 501 | 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 | 172,306 | 240,500
Temporarily impaired securities, total unrealized losses | 501 | 1,111
US Government Corporations and Agencies Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 6,617 | 0
Temporarily impaired securities, less than 12 months, unrealized losses | 3 | 0
Temporarily impaired securities, 12 months or longer, fair value | 1,676 | 1,806
Temporarily impaired securities, 12 months or longer, unrealized losses | 124 | 121
Temporarily impaired securities, total fair value | 8,293 | 1,806
Temporarily impaired securities, total unrealized losses | 127 | 121
Collateralized Mortgage-Backed Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 127,422 | 394,123
Temporarily impaired securities, less than 12 months, unrealized losses | 4,819 | 33,042
Temporarily impaired securities, 12 months or longer, fair value | 709,405 | 452,739
Temporarily impaired securities, 12 months or longer, unrealized losses | 108,246 | 93,941
Temporarily impaired securities, total fair value | 836,827 | 846,862
Temporarily impaired securities, total unrealized losses | 113,065 | 126,983
Collateralized Mortgage Obligations [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 24,326 | 24,427
Temporarily impaired securities, less than 12 months, unrealized losses | 1,206 | 1,614
Temporarily impaired securities, 12 months or longer, fair value | 6,641 | 6,634
Temporarily impaired securities, 12 months or longer, unrealized losses | 1,704 | 1,877
Temporarily impaired securities, total fair value | 30,967 | 31,061
Temporarily impaired securities, total unrealized losses | 2,910 | 3,491
Corporate Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 98,411 | 109,995
Temporarily impaired securities, less than 12 months, unrealized losses | 1,589 | 3,256
Temporarily impaired securities, 12 months or longer, fair value | 114,663 | 100,977
Temporarily impaired securities, 12 months or longer, unrealized losses | 14,036 | 14,553
Temporarily impaired securities, total fair value | 213,074 | 210,972
Temporarily impaired securities, total unrealized losses | $ 15,625 | $ 17,809

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