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Note 3 - Investment Securities - Securities in an Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Temporarily impaired securities, fair value | $ 563,219 | $ 551,786
Temporarily impaired securities, unrealized losses | (92,206) | (82,424)
Temporarily impaired securities, fair value, less than 12 months | 37,735 | 10,160
Temporarily impaired securities, unrealized losses, less than 12 months | (573) | (130)
Temporarily impaired securities, fair value, 12 months or longer | 525,484 | 541,626
Temporarily impaired securities, unrealized losses, 12 months or longer | (91,633) | (82,294)
US Government Agencies Debt Securities [Member] |  |
Temporarily impaired securities, fair value | 49,276 | 40,779
Temporarily impaired securities, unrealized losses | (11,411) | (10,761)
Temporarily impaired securities, fair value, less than 12 months | 11,597 | 1,689
Temporarily impaired securities, unrealized losses, less than 12 months | (93) | (65)
Temporarily impaired securities, fair value, 12 months or longer | 37,679 | 39,090
Temporarily impaired securities, unrealized losses, 12 months or longer | (11,318) | (10,696)
Residential Mortgage-Backed Securities [Member] |  |
Temporarily impaired securities, fair value | 368,077 | 382,042
Temporarily impaired securities, unrealized losses | (58,848) | (51,433)
Temporarily impaired securities, fair value, less than 12 months | 3,345 | 4,138
Temporarily impaired securities, unrealized losses, less than 12 months | (77) | (51)
Temporarily impaired securities, fair value, 12 months or longer | 364,732 | 377,904
Temporarily impaired securities, unrealized losses, 12 months or longer | (58,771) | (51,382)
Commercial Mortgage-Backed Securities [Member] |  |
Temporarily impaired securities, fair value | 21,437 | 21,565
Temporarily impaired securities, unrealized losses | (3,740) | (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 | 21,437 | 21,565
Temporarily impaired securities, unrealized losses, 12 months or longer | (3,740) | (3,676)
US States and Political Subdivisions Debt Securities [Member] |  |
Temporarily impaired securities, fair value | 118,304 | 101,189
Temporarily impaired securities, unrealized losses | (18,163) | (16,505)
Temporarily impaired securities, fair value, less than 12 months | 19,806 | 1,340
Temporarily impaired securities, unrealized losses, less than 12 months | (389) | (7)
Temporarily impaired securities, fair value, 12 months or longer | 98,498 | 99,849
Temporarily impaired securities, unrealized losses, 12 months or longer | (17,774) | (16,498)
Corporate Debt Securities [Member] |  |
Temporarily impaired securities, fair value | 4,972 | 4,973
Temporarily impaired securities, unrealized losses | (29) | (27)
Temporarily impaired securities, fair value, less than 12 months | 2,987 | 2,993
Temporarily impaired securities, unrealized losses, less than 12 months | (14) | (7)
Temporarily impaired securities, fair value, 12 months or longer | 1,985 | 1,980
Temporarily impaired securities, unrealized losses, 12 months or longer | (15) | (20)
Asset-Backed Securities [Member] |  |
Temporarily impaired securities, fair value | 1,153 | 1,238
Temporarily impaired securities, unrealized losses | (15) | (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 | 1,153 | 1,238
Temporarily impaired securities, unrealized losses, 12 months or longer | $ (15) | $ (22)

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