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Note 3 - Investment Securities - Securities in an Unrealized Loss Position (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Temporarily impaired securities, fair value | $ 579,209 | $ 608,473
Temporarily impaired securities, unrealized losses | (90,879) | (87,204)
Temporarily impaired securities, fair value, less than 12 months | 159,509 | 307,425
Temporarily impaired securities, unrealized losses, less than 12 months | (7,543) | (21,450)
Temporarily impaired securities, fair value, 12 months or longer | 419,700 | 301,048
Temporarily impaired securities, unrealized losses, 12 months or longer | (83,336) | (65,754)
US Government Agencies Debt Securities [Member] |  |
Temporarily impaired securities, fair value | 43,154 | 44,451
Temporarily impaired securities, unrealized losses | (10,949) | (10,439)
Temporarily impaired securities, fair value, less than 12 months | 4,565 | 20,517
Temporarily impaired securities, unrealized losses, less than 12 months | (347) | (1,831)
Temporarily impaired securities, fair value, 12 months or longer | 38,589 | 23,934
Temporarily impaired securities, unrealized losses, 12 months or longer | (10,602) | (8,608)
Residential Mortgage-Backed Securities [Member] |  |
Temporarily impaired securities, fair value | 395,195 | 403,039
Temporarily impaired securities, unrealized losses | (56,810) | (57,863)
Temporarily impaired securities, fair value, less than 12 months | 130,196 | 218,918
Temporarily impaired securities, unrealized losses, less than 12 months | (5,818) | (13,869)
Temporarily impaired securities, fair value, 12 months or longer | 264,999 | 184,121
Temporarily impaired securities, unrealized losses, 12 months or longer | (50,992) | (43,994)
Commercial Mortgage-Backed Securities [Member] |  |
Temporarily impaired securities, fair value | 21,210 | 21,105
Temporarily impaired securities, unrealized losses | (4,154) | (4,381)
Temporarily impaired securities, fair value, less than 12 months | 0 | 14,523
Temporarily impaired securities, unrealized losses, less than 12 months | 0 | (2,304)
Temporarily impaired securities, fair value, 12 months or longer | 21,210 | 6,582
Temporarily impaired securities, unrealized losses, 12 months or longer | (4,154) | (2,077)
US States and Political Subdivisions Debt Securities [Member] |  |
Temporarily impaired securities, fair value | 116,310 | 133,265
Temporarily impaired securities, unrealized losses | (18,884) | (14,462)
Temporarily impaired securities, fair value, less than 12 months | 22,408 | 47,446
Temporarily impaired securities, unrealized losses, less than 12 months | (1,320) | (3,404)
Temporarily impaired securities, fair value, 12 months or longer | 93,902 | 85,819
Temporarily impaired securities, unrealized losses, 12 months or longer | (17,564) | (11,058)
Corporate Debt Securities [Member] |  |
Temporarily impaired securities, fair value | 1,959 | 4,973
Temporarily impaired securities, unrealized losses | (41) | (26)
Temporarily impaired securities, fair value, less than 12 months | 1,959 | 4,973
Temporarily impaired securities, unrealized losses, less than 12 months | (41) | (26)
Temporarily impaired securities, fair value, 12 months or longer | 0 | 0
Temporarily impaired securities, unrealized losses, 12 months or longer | 0 | 0
Asset-Backed Securities [Member] |  |
Temporarily impaired securities, fair value | 1,381 | 1,640
Temporarily impaired securities, unrealized losses | (41) | (33)
Temporarily impaired securities, fair value, less than 12 months | 381 | 1,048
Temporarily impaired securities, unrealized losses, less than 12 months | (17) | (16)
Temporarily impaired securities, fair value, 12 months or longer | 1,000 | 592
Temporarily impaired securities, unrealized losses, 12 months or longer | $ (24) | $ (17)

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