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Note 3 - Investment Securities - Securities in an Unrealized Loss Position (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Temporarily impaired securities, fair value | $ 572,637 | $ 551,786
Temporarily impaired securities, unrealized losses | (96,413) | (82,424)
Temporarily impaired securities, fair value, less than 12 months | 58,092 | 10,160
Temporarily impaired securities, unrealized losses, less than 12 months | (795) | (130)
Temporarily impaired securities, fair value, 12 months or longer | 514,545 | 541,626
Temporarily impaired securities, unrealized losses, 12 months or longer | (95,618) | (82,294)
US Government Agencies Debt Securities [Member] |  |
Temporarily impaired securities, fair value | 57,109 | 40,779
Temporarily impaired securities, unrealized losses | (11,918) | (10,761)
Temporarily impaired securities, fair value, less than 12 months | 19,579 | 1,689
Temporarily impaired securities, unrealized losses, less than 12 months | (129) | (65)
Temporarily impaired securities, fair value, 12 months or longer | 37,530 | 39,090
Temporarily impaired securities, unrealized losses, 12 months or longer | (11,789) | (10,696)
Residential Mortgage-Backed Securities [Member] |  |
Temporarily impaired securities, fair value | 373,145 | 382,042
Temporarily impaired securities, unrealized losses | (60,787) | (51,433)
Temporarily impaired securities, fair value, less than 12 months | 15,527 | 4,138
Temporarily impaired securities, unrealized losses, less than 12 months | (92) | (51)
Temporarily impaired securities, fair value, 12 months or longer | 357,618 | 377,904
Temporarily impaired securities, unrealized losses, 12 months or longer | (60,695) | (51,382)
Commercial Mortgage-Backed Securities [Member] |  |
Temporarily impaired securities, fair value | 21,419 | 21,565
Temporarily impaired securities, unrealized losses | (3,697) | (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 | 21,419 | 21,565
Temporarily impaired securities, unrealized losses, 12 months or longer | (3,697) | (3,676)
US States and Political Subdivisions Debt Securities [Member] |  |
Temporarily impaired securities, fair value | 114,985 | 101,189
Temporarily impaired securities, unrealized losses | (19,977) | (16,505)
Temporarily impaired securities, fair value, less than 12 months | 20,002 | 1,340
Temporarily impaired securities, unrealized losses, less than 12 months | (558) | (7)
Temporarily impaired securities, fair value, 12 months or longer | 94,983 | 99,849
Temporarily impaired securities, unrealized losses, 12 months or longer | (19,419) | (16,498)
Corporate Debt Securities [Member] |  |
Temporarily impaired securities, fair value | 4,978 | 4,973
Temporarily impaired securities, unrealized losses | (22) | (27)
Temporarily impaired securities, fair value, less than 12 months | 2,984 | 2,993
Temporarily impaired securities, unrealized losses, less than 12 months | (16) | (7)
Temporarily impaired securities, fair value, 12 months or longer | 1,994 | 1,980
Temporarily impaired securities, unrealized losses, 12 months or longer | (6) | (20)
Asset-Backed Securities [Member] |  |
Temporarily impaired securities, fair value | 1,001 | 1,238
Temporarily impaired securities, unrealized losses | (12) | (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 | 1,001 | 1,238
Temporarily impaired securities, unrealized losses, 12 months or longer | $ (12) | $ (22)

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