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Note 3 - Securities - Securities in a Continuous Loss Position (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Temporarily impaired securities, less than 12 months, fair value | $ 2,500 | $ 389,208
Temporarily impaired securities, less than 12 months unrealized loss | 27 | 39,109
Temporarily impaired securities, 12 months or more fair value | 615,242 | 259,070
Temporarily impaired securities, 12 months or more unrealized loss | 79,158 | 64,043
US Government Agencies Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 0 | 144,574
Temporarily impaired securities, less than 12 months unrealized loss | 0 | 12,699
Temporarily impaired securities, 12 months or more fair value | 311,844 | 190,950
Temporarily impaired securities, 12 months or more unrealized loss | 42,060 | 42,303
US States and Political Subdivisions Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 884 | 94,657
Temporarily impaired securities, less than 12 months unrealized loss | 1 | 18,373
Temporarily impaired securities, 12 months or more fair value | 148,763 | 52,134
Temporarily impaired securities, 12 months or more unrealized loss | 29,613 | 19,645
Commercial Mortgage-Backed Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 1,616 | 144,198
Temporarily impaired securities, less than 12 months unrealized loss | 26 | 7,326
Temporarily impaired securities, 12 months or more fair value | 147,922 | 15,165
Temporarily impaired securities, 12 months or more unrealized loss | 6,698 | 1,913
Corporate Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 0 | 4,843
Temporarily impaired securities, less than 12 months unrealized loss | 0 | 655
Temporarily impaired securities, 12 months or more fair value | 5,750 | 821
Temporarily impaired securities, 12 months or more unrealized loss | 754 | 182
US Treasury Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 0 | 936
Temporarily impaired securities, less than 12 months unrealized loss | 0 | 56
Temporarily impaired securities, 12 months or more fair value | 963 | 0
Temporarily impaired securities, 12 months or more unrealized loss | $ 33 | $ 0

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