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Note 4 - Investment Securities - Securities in an Unrealized Loss Position (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Temporarily impaired securities, fair value | $ 554,720 | $ 551,786
Temporarily impaired securities, unrealized losses | (96,074) | (82,424)
Temporarily impaired securities, fair value, less than 12 months | 60,543 | 10,160
Temporarily impaired securities, unrealized losses, less than 12 months | (1,004) | (130)
Temporarily impaired securities, fair value, 12 months or longer | 494,177 | 541,626
Temporarily impaired securities, unrealized losses, 12 months or longer | (95,070) | (82,294)
US Government Agencies Debt Securities [Member] |  |
Temporarily impaired securities, fair value | 53,467 | 40,779
Temporarily impaired securities, unrealized losses | (11,674) | (10,761)
Temporarily impaired securities, fair value, less than 12 months | 18,471 | 1,689
Temporarily impaired securities, unrealized losses, less than 12 months | (60) | (65)
Temporarily impaired securities, fair value, 12 months or longer | 34,996 | 39,090
Temporarily impaired securities, unrealized losses, 12 months or longer | (11,614) | (10,696)
Residential Mortgage-Backed Securities [Member] |  |
Temporarily impaired securities, fair value | 364,971 | 382,042
Temporarily impaired securities, unrealized losses | (60,818) | (51,433)
Temporarily impaired securities, fair value, less than 12 months | 26,809 | 4,138
Temporarily impaired securities, unrealized losses, less than 12 months | (604) | (51)
Temporarily impaired securities, fair value, 12 months or longer | 338,162 | 377,904
Temporarily impaired securities, unrealized losses, 12 months or longer | (60,214) | (51,382)
Commercial Mortgage-Backed Securities [Member] |  |
Temporarily impaired securities, fair value | 20,892 | 21,565
Temporarily impaired securities, unrealized losses | (4,097) | (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 | 20,892 | 21,565
Temporarily impaired securities, unrealized losses, 12 months or longer | (4,097) | (3,676)
US States and Political Subdivisions Debt Securities [Member] |  |
Temporarily impaired securities, fair value | 112,523 | 101,189
Temporarily impaired securities, unrealized losses | (19,460) | (16,505)
Temporarily impaired securities, fair value, less than 12 months | 13,281 | 1,340
Temporarily impaired securities, unrealized losses, less than 12 months | (322) | (7)
Temporarily impaired securities, fair value, 12 months or longer | 99,242 | 99,849
Temporarily impaired securities, unrealized losses, 12 months or longer | (19,138) | (16,498)
Corporate Debt Securities [Member] |  |
Temporarily impaired securities, fair value | 1,982 | 4,973
Temporarily impaired securities, unrealized losses | (18) | (27)
Temporarily impaired securities, fair value, less than 12 months | 1,982 | 2,993
Temporarily impaired securities, unrealized losses, less than 12 months | (18) | (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 | 885 | 1,238
Temporarily impaired securities, unrealized losses | (7) | (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 | 885 | 1,238
Temporarily impaired securities, unrealized losses, 12 months or longer | $ (7) | $ (22)

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