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Note 3 - Investment Securities - Securities in an Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Temporarily impaired securities, fair value | $ 580,505 | $ 608,473
Temporarily impaired securities, unrealized losses | (122,975) | (87,204)
Temporarily impaired securities, fair value, less than 12 months | 58,344 | 307,425
Temporarily impaired securities, unrealized losses, less than 12 months | (2,883) | (21,450)
Temporarily impaired securities, fair value, 12 months or longer | 522,161 | 301,048
Temporarily impaired securities, unrealized losses, 12 months or longer | (120,092) | (65,754)
US Government Agencies Debt Securities [Member] |  |
Temporarily impaired securities, fair value | 43,969 | 44,451
Temporarily impaired securities, unrealized losses | (13,274) | (10,439)
Temporarily impaired securities, fair value, less than 12 months | 6,056 | 20,517
Temporarily impaired securities, unrealized losses, less than 12 months | (194) | (1,831)
Temporarily impaired securities, fair value, 12 months or longer | 37,913 | 23,934
Temporarily impaired securities, unrealized losses, 12 months or longer | (13,080) | (8,608)
Residential Mortgage-Backed Securities [Member] |  |
Temporarily impaired securities, fair value | 389,427 | 403,039
Temporarily impaired securities, unrealized losses | (76,935) | (57,863)
Temporarily impaired securities, fair value, less than 12 months | 28,555 | 218,918
Temporarily impaired securities, unrealized losses, less than 12 months | (858) | (13,869)
Temporarily impaired securities, fair value, 12 months or longer | 360,872 | 184,121
Temporarily impaired securities, unrealized losses, 12 months or longer | (76,077) | (43,994)
Commercial Mortgage-Backed Securities [Member] |  |
Temporarily impaired securities, fair value | 19,927 | 21,105
Temporarily impaired securities, unrealized losses | (5,376) | (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 | 19,927 | 6,582
Temporarily impaired securities, unrealized losses, 12 months or longer | (5,376) | (2,077)
US States and Political Subdivisions Debt Securities [Member] |  |
Temporarily impaired securities, fair value | 122,899 | 133,265
Temporarily impaired securities, unrealized losses | (27,319) | (14,462)
Temporarily impaired securities, fair value, less than 12 months | 22,739 | 47,446
Temporarily impaired securities, unrealized losses, less than 12 months | (1,825) | (3,404)
Temporarily impaired securities, fair value, 12 months or longer | 100,160 | 85,819
Temporarily impaired securities, unrealized losses, 12 months or longer | (25,494) | (11,058)
Corporate Debt Securities [Member] |  |
Temporarily impaired securities, fair value | 2,961 | 4,973
Temporarily impaired securities, unrealized losses | (39) | (26)
Temporarily impaired securities, fair value, less than 12 months | 994 | 4,973
Temporarily impaired securities, unrealized losses, less than 12 months | (6) | (26)
Temporarily impaired securities, fair value, 12 months or longer | 1,967 | 0
Temporarily impaired securities, unrealized losses, 12 months or longer | (33) | 0
Asset-Backed Securities [Member] |  |
Temporarily impaired securities, fair value | 1,322 | 1,640
Temporarily impaired securities, unrealized losses | (32) | (33)
Temporarily impaired securities, fair value, less than 12 months | 0 | 1,048
Temporarily impaired securities, unrealized losses, less than 12 months | 0 | (16)
Temporarily impaired securities, fair value, 12 months or longer | 1,322 | 592
Temporarily impaired securities, unrealized losses, 12 months or longer | $ (32) | $ (17)

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