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Note 3 - Investment Securities - Securities in an Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Temporarily impaired securities, fair value | $ 613,871 | $ 374,015
Temporarily impaired securities, unrealized losses | (95,149) | (4,956)
Temporarily impaired securities, fair value, less than 12 months | 425,265 | 338,632
Temporarily impaired securities, unrealized losses, less than 12 months | (50,668) | (3,795)
Temporarily impaired securities, fair value, 12 months or longer | 188,606 | 35,383
Temporarily impaired securities, unrealized losses, 12 months or longer | (44,481) | (1,161)
US Government Agencies Debt Securities [Member] |  |
Temporarily impaired securities, fair value | 45,620 | 28,974
Temporarily impaired securities, unrealized losses | (10,276) | (625)
Temporarily impaired securities, fair value, less than 12 months | 30,535 | 28,974
Temporarily impaired securities, unrealized losses, less than 12 months | (4,261) | (625)
Temporarily impaired securities, fair value, 12 months or longer | 15,085 | 0
Temporarily impaired securities, unrealized losses, 12 months or longer | (6,015) | 0
Residential Mortgage-Backed Securities [Member] |  |
Temporarily impaired securities, fair value | 406,984 | 246,396
Temporarily impaired securities, unrealized losses | (61,798) | (2,884)
Temporarily impaired securities, fair value, less than 12 months | 293,070 | 214,701
Temporarily impaired securities, unrealized losses, less than 12 months | (32,342) | (2,111)
Temporarily impaired securities, fair value, 12 months or longer | 113,914 | 31,695
Temporarily impaired securities, unrealized losses, 12 months or longer | (29,456) | (773)
Commercial Mortgage-Backed Securities [Member] |  |
Temporarily impaired securities, fair value | 20,895 | 8,370
Temporarily impaired securities, unrealized losses | (4,651) | (463)
Temporarily impaired securities, fair value, less than 12 months | 15,961 | 4,682
Temporarily impaired securities, unrealized losses, less than 12 months | (2,943) | (75)
Temporarily impaired securities, fair value, 12 months or longer | 4,934 | 3,688
Temporarily impaired securities, unrealized losses, 12 months or longer | (1,708) | (388)
US States and Political Subdivisions Debt Securities [Member] |  |
Temporarily impaired securities, fair value | 135,483 | 89,473
Temporarily impaired securities, unrealized losses | (18,380) | (982)
Temporarily impaired securities, fair value, less than 12 months | 81,466 | 89,473
Temporarily impaired securities, unrealized losses, less than 12 months | (11,098) | (982)
Temporarily impaired securities, fair value, 12 months or longer | 54,017 | 0
Temporarily impaired securities, unrealized losses, 12 months or longer | (7,282) | 0
Corporate Debt Securities [Member] |  |
Temporarily impaired securities, fair value | 2,991 |
Temporarily impaired securities, unrealized losses | (8) |
Temporarily impaired securities, fair value, less than 12 months | 2,991 |
Temporarily impaired securities, unrealized losses, less than 12 months | (8) |
Temporarily impaired securities, fair value, 12 months or longer | 0 |
Temporarily impaired securities, unrealized losses, 12 months or longer | 0 |
Asset-Backed Securities [Member] |  |
Temporarily impaired securities, fair value | 1,898 | 802
Temporarily impaired securities, unrealized losses | (36) | (2)
Temporarily impaired securities, fair value, less than 12 months | 1,242 | 802
Temporarily impaired securities, unrealized losses, less than 12 months | (16) | (2)
Temporarily impaired securities, fair value, 12 months or longer | 656 | 0
Temporarily impaired securities, unrealized losses, 12 months or longer | $ (20) | $ 0

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