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Note 4 - Investment Securities - Securities in an Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Temporarily impaired securities, fair value | $ 534,854 | $ 551,786
Temporarily impaired securities, unrealized losses | (72,007) | (82,424)
Temporarily impaired securities, fair value, less than 12 months | 13,468 | 10,160
Temporarily impaired securities, unrealized losses, less than 12 months | (152) | (130)
Temporarily impaired securities, fair value, 12 months or longer | 521,386 | 541,626
Temporarily impaired securities, unrealized losses, 12 months or longer | (71,855) | (82,294)
US Government Agencies Debt Securities [Member] |  |
Temporarily impaired securities, fair value | 37,857 | 40,779
Temporarily impaired securities, unrealized losses | (10,070) | (10,761)
Temporarily impaired securities, fair value, less than 12 months | 0 | 1,689
Temporarily impaired securities, unrealized losses, less than 12 months | 0 | (65)
Temporarily impaired securities, fair value, 12 months or longer | 37,857 | 39,090
Temporarily impaired securities, unrealized losses, 12 months or longer | (10,070) | (10,696)
Residential Mortgage-Backed Securities [Member] |  |
Temporarily impaired securities, fair value | 369,309 | 382,042
Temporarily impaired securities, unrealized losses | (43,496) | (51,433)
Temporarily impaired securities, fair value, less than 12 months | 5,786 | 4,138
Temporarily impaired securities, unrealized losses, less than 12 months | (110) | (51)
Temporarily impaired securities, fair value, 12 months or longer | 363,523 | 377,904
Temporarily impaired securities, unrealized losses, 12 months or longer | (43,386) | (51,382)
Commercial Mortgage-Backed Securities [Member] |  |
Temporarily impaired securities, fair value | 22,285 | 21,565
Temporarily impaired securities, unrealized losses | (2,768) | (3,676)
Temporarily impaired securities, fair value, less than 12 months | 0 | 0
Temporarily impaired securities, unrealized losses, less than 12 months | 0 | 0
Temporarily impaired securities, fair value, 12 months or longer | 22,285 | 21,565
Temporarily impaired securities, unrealized losses, 12 months or longer | (2,768) | (3,676)
US States and Political Subdivisions Debt Securities [Member] |  |
Temporarily impaired securities, fair value | 104,497 | 101,189
Temporarily impaired securities, unrealized losses | (15,662) | (16,505)
Temporarily impaired securities, fair value, less than 12 months | 7,682 | 1,340
Temporarily impaired securities, unrealized losses, less than 12 months | (42) | (7)
Temporarily impaired securities, fair value, 12 months or longer | 96,815 | 99,849
Temporarily impaired securities, unrealized losses, 12 months or longer | (15,620) | (16,498)
Corporate Debt Securities [Member] |  |
Temporarily impaired securities, fair value | 0 | 4,973
Temporarily impaired securities, unrealized losses | 0 | (27)
Temporarily impaired securities, fair value, less than 12 months | 0 | 2,993
Temporarily impaired securities, unrealized losses, less than 12 months | 0 | (7)
Temporarily impaired securities, fair value, 12 months or longer | 0 | 1,980
Temporarily impaired securities, unrealized losses, 12 months or longer | 0 | (20)
Asset-Backed Securities [Member] |  |
Temporarily impaired securities, fair value | 906 | 1,238
Temporarily impaired securities, unrealized losses | (11) | (22)
Temporarily impaired securities, fair value, less than 12 months | 0 | 0
Temporarily impaired securities, unrealized losses, less than 12 months | 0 | 0
Temporarily impaired securities, fair value, 12 months or longer | 906 | 1,238
Temporarily impaired securities, unrealized losses, 12 months or longer | $ (11) | $ (22)

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