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Note 7 - Investment Securities - Temporarily Impaired Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Temporarily impaired securities, less than 12 months, fair value | $ 122,474 | $ 59,054
Temporarily impaired securities, less than 12 months, unrealized losses | 88 | 1,067
Temporarily impaired securities, 12 months or longer, fair value | 761,400 | 807,644
Temporarily impaired securities, 12 months or longer, unrealized losses | 85,626 | 120,978
Temporarily impaired securities, total fair value | 883,874 | 866,698
Temporarily impaired securities, total unrealized losses | 85,714 | 122,045
Temporarily impaired securities, 12 months or longer, fair value | 761,400 | 807,644
US Treasury Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 108,009 |
Temporarily impaired securities, less than 12 months, unrealized losses | 10 |
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 | 108,009 |
Temporarily impaired securities, total unrealized losses | 10 |
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 | 4,295 | 4,199
Temporarily impaired securities, less than 12 months, unrealized losses | 9 | 8
Temporarily impaired securities, 12 months or longer, fair value | 2,495 | 2,108
Temporarily impaired securities, 12 months or longer, unrealized losses | 110 | 119
Temporarily impaired securities, total fair value | 6,790 | 6,307
Temporarily impaired securities, total unrealized losses | 119 | 127
Temporarily impaired securities, 12 months or longer, fair value | 2,495 | 2,108
Collateralized Mortgage-Backed Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 240 | 29,955
Temporarily impaired securities, less than 12 months, unrealized losses | 0 | 959
Temporarily impaired securities, 12 months or longer, fair value | 629,714 | 653,236
Temporarily impaired securities, 12 months or longer, unrealized losses | 81,392 | 112,237
Temporarily impaired securities, total fair value | 629,954 | 683,191
Temporarily impaired securities, total unrealized losses | 81,392 | 113,196
Temporarily impaired securities, 12 months or longer, fair value | 629,714 | 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 | 23,302 | 24,556
Temporarily impaired securities, 12 months or longer, unrealized losses | 1,869 | 3,191
Temporarily impaired securities, total fair value | 23,302 | 24,556
Temporarily impaired securities, total unrealized losses | 1,869 | 3,191
Temporarily impaired securities, 12 months or longer, fair value | 23,302 | 24,556
Corporate Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 9,930 | 24,900
Temporarily impaired securities, less than 12 months, unrealized losses | 69 | 100
Temporarily impaired securities, 12 months or longer, fair value | 105,889 | 127,744
Temporarily impaired securities, 12 months or longer, unrealized losses | 2,255 | 5,431
Temporarily impaired securities, total fair value | 115,819 | 152,644
Temporarily impaired securities, total unrealized losses | 2,324 | 5,531
Temporarily impaired securities, 12 months or longer, fair value | $ 105,889 | $ 127,744

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