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Note 7 - Investment Securities - Temporarily Impaired Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Temporarily impaired securities, less than 12 months, fair value | $ 610,955 | $ 59,054
Temporarily impaired securities, less than 12 months, unrealized losses | 586 | 1,067
Temporarily impaired securities, 12 months or longer, fair value | 775,267 | 807,644
Temporarily impaired securities, 12 months or longer, unrealized losses | 97,933 | 120,978
Temporarily impaired securities, total fair value | 1,386,222 | 866,698
Temporarily impaired securities, total unrealized losses | 98,519 | 122,045
Temporarily impaired securities, 12 months or longer, fair value | 775,267 | 807,644
US Treasury Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 570,370 |
Temporarily impaired securities, less than 12 months, unrealized losses | 140 |
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 | 570,370 |
Temporarily impaired securities, total unrealized losses | 140 |
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 | 2,332 | 4,199
Temporarily impaired securities, less than 12 months, unrealized losses | 2 | 8
Temporarily impaired securities, 12 months or longer, fair value | 2,845 | 2,108
Temporarily impaired securities, 12 months or longer, unrealized losses | 109 | 119
Temporarily impaired securities, total fair value | 5,177 | 6,307
Temporarily impaired securities, total unrealized losses | 111 | 127
Temporarily impaired securities, 12 months or longer, fair value | 2,845 | 2,108
Collateralized Mortgage-Backed Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 28,273 | 29,955
Temporarily impaired securities, less than 12 months, unrealized losses | 424 | 959
Temporarily impaired securities, 12 months or longer, fair value | 628,662 | 653,236
Temporarily impaired securities, 12 months or longer, unrealized losses | 92,407 | 112,237
Temporarily impaired securities, total fair value | 656,935 | 683,191
Temporarily impaired securities, total unrealized losses | 92,831 | 113,196
Temporarily impaired securities, 12 months or longer, fair value | 628,662 | 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 | 23,927 | 24,556
Temporarily impaired securities, 12 months or longer, unrealized losses | 2,096 | 3,191
Temporarily impaired securities, total fair value | 23,927 | 24,556
Temporarily impaired securities, total unrealized losses | 2,096 | 3,191
Temporarily impaired securities, 12 months or longer, fair value | 23,927 | 24,556
Corporate Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 9,980 | 24,900
Temporarily impaired securities, less than 12 months, unrealized losses | 20 | 100
Temporarily impaired securities, 12 months or longer, fair value | 119,833 | 127,744
Temporarily impaired securities, 12 months or longer, unrealized losses | 3,321 | 5,431
Temporarily impaired securities, total fair value | 129,813 | 152,644
Temporarily impaired securities, total unrealized losses | 3,341 | 5,531
Temporarily impaired securities, 12 months or longer, fair value | $ 119,833 | $ 127,744

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