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Note 3 - Investment Securities - Securities in an Unrealized Loss Position (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Temporarily impaired securities, fair value | $ 608,473 | $ 374,015
Temporarily impaired securities, unrealized losses | (87,204) | (4,956)
Temporarily impaired securities, fair value, less than 12 months | 307,425 | 338,632
Temporarily impaired securities, unrealized losses, less than 12 months | (21,450) | (3,795)
Temporarily impaired securities, fair value, 12 months or longer | 301,048 | 35,383
Temporarily impaired securities, unrealized losses, 12 months or longer | (65,754) | (1,161)
US Government Agencies Debt Securities [Member] |  |
Temporarily impaired securities, fair value | 44,451 | 28,974
Temporarily impaired securities, unrealized losses | (10,439) | (625)
Temporarily impaired securities, fair value, less than 12 months | 20,517 | 28,974
Temporarily impaired securities, unrealized losses, less than 12 months | (1,831) | (625)
Temporarily impaired securities, fair value, 12 months or longer | 23,934 | 0
Temporarily impaired securities, unrealized losses, 12 months or longer | (8,608) | 0
Residential Mortgage-Backed Securities [Member] |  |
Temporarily impaired securities, fair value | 403,039 | 246,396
Temporarily impaired securities, unrealized losses | (57,863) | (2,884)
Temporarily impaired securities, fair value, less than 12 months | 218,918 | 214,701
Temporarily impaired securities, unrealized losses, less than 12 months | (13,869) | (2,111)
Temporarily impaired securities, fair value, 12 months or longer | 184,121 | 31,695
Temporarily impaired securities, unrealized losses, 12 months or longer | (43,994) | (773)
Commercial Mortgage-Backed Securities [Member] |  |
Temporarily impaired securities, fair value | 21,105 | 8,370
Temporarily impaired securities, unrealized losses | (4,381) | (463)
Temporarily impaired securities, fair value, less than 12 months | 14,523 | 4,682
Temporarily impaired securities, unrealized losses, less than 12 months | (2,304) | (75)
Temporarily impaired securities, fair value, 12 months or longer | 6,582 | 3,688
Temporarily impaired securities, unrealized losses, 12 months or longer | (2,077) | (388)
US States and Political Subdivisions Debt Securities [Member] |  |
Temporarily impaired securities, fair value | 133,265 | 89,473
Temporarily impaired securities, unrealized losses | (14,462) | (982)
Temporarily impaired securities, fair value, less than 12 months | 47,446 | 89,473
Temporarily impaired securities, unrealized losses, less than 12 months | (3,404) | (982)
Temporarily impaired securities, fair value, 12 months or longer | 85,819 | 0
Temporarily impaired securities, unrealized losses, 12 months or longer | (11,058) | 0
Corporate Debt Securities [Member] |  |
Temporarily impaired securities, fair value | 4,973 |
Temporarily impaired securities, unrealized losses | (26) |
Temporarily impaired securities, fair value, less than 12 months | 4,973 |
Temporarily impaired securities, unrealized losses, less than 12 months | (26) |
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 | 1,640 | 802
Temporarily impaired securities, unrealized losses | (33) | (2)
Temporarily impaired securities, fair value, less than 12 months | 1,048 | 802
Temporarily impaired securities, unrealized losses, less than 12 months | (16) | (2)
Temporarily impaired securities, fair value, 12 months or longer | 592 | 0
Temporarily impaired securities, unrealized losses, 12 months or longer | $ (17) | $ 0

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