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Note 7 - Investment Securities - Temporarily Impaired Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Temporarily impaired securities, less than 12 months, fair value | $ 422,891 | $ 59,054
Temporarily impaired securities, less than 12 months, unrealized losses | 389 | 1,067
Temporarily impaired securities, 12 months or longer, fair value | 795,682 | 807,644
Temporarily impaired securities, 12 months or longer, unrealized losses | 102,024 | 120,978
Temporarily impaired securities, total fair value | 1,218,573 | 866,698
Temporarily impaired securities, total unrealized losses | 102,413 | 122,045
Temporarily impaired securities, 12 months or longer, fair value | 795,682 | 807,644
US Treasury Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 394,431 |
Temporarily impaired securities, less than 12 months, unrealized losses | 29 |
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 | 394,431 |
Temporarily impaired securities, total unrealized losses | 29 |
Temporarily impaired securities, 12 months or longer, fair value | 0 |
US Government Corporations and Agencies Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 3,587 | 4,199
Temporarily impaired securities, less than 12 months, unrealized losses | 5 | 8
Temporarily impaired securities, 12 months or longer, fair value | 3,071 | 2,108
Temporarily impaired securities, 12 months or longer, unrealized losses | 109 | 119
Temporarily impaired securities, total fair value | 6,658 | 6,307
Temporarily impaired securities, total unrealized losses | 114 | 127
Temporarily impaired securities, 12 months or longer, fair value | 3,071 | 2,108
Collateralized Mortgage-Backed Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 14,888 | 29,955
Temporarily impaired securities, less than 12 months, unrealized losses | 340 | 959
Temporarily impaired securities, 12 months or longer, fair value | 648,958 | 653,236
Temporarily impaired securities, 12 months or longer, unrealized losses | 95,454 | 112,237
Temporarily impaired securities, total fair value | 663,846 | 683,191
Temporarily impaired securities, total unrealized losses | 95,794 | 113,196
Temporarily impaired securities, 12 months or longer, fair value | 648,958 | 653,236
Collateralized Mortgage Obligations [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 0 | 0
Temporarily impaired securities, less than 12 months, unrealized losses | 0 | 0
Temporarily impaired securities, 12 months or longer, fair value | 24,663 | 24,556
Temporarily impaired securities, 12 months or longer, unrealized losses | 2,286 | 3,191
Temporarily impaired securities, total fair value | 24,663 | 24,556
Temporarily impaired securities, total unrealized losses | 2,286 | 3,191
Temporarily impaired securities, 12 months or longer, fair value | 24,663 | 24,556
Corporate Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 9,985 | 24,900
Temporarily impaired securities, less than 12 months, unrealized losses | 15 | 100
Temporarily impaired securities, 12 months or longer, fair value | 118,990 | 127,744
Temporarily impaired securities, 12 months or longer, unrealized losses | 4,175 | 5,431
Temporarily impaired securities, total fair value | 128,975 | 152,644
Temporarily impaired securities, total unrealized losses | 4,190 | 5,531
Temporarily impaired securities, 12 months or longer, fair value | $ 118,990 | $ 127,744

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