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Note 8 - Investment Securities - Temporarily Impaired Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Temporarily impaired securities, less than 12 months, fair value | $ 845,994 | $ 639,985
Temporarily impaired securities, less than 12 months, unrealized losses | 49,282 | 9,198
Temporarily impaired securities, 12 months or longer, fair value | 164,771 | 28,429
Temporarily impaired securities, 12 months or longer, unrealized losses | 17,665 | 1,435
Temporarily impaired securities, total fair value | 1,010,765 | 668,414
Temporarily impaired securities, total unrealized losses | 66,947 | 10,633
US Treasury Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 39,603 |
Temporarily impaired securities, less than 12 months, unrealized losses | 13 |
Temporarily impaired securities, 12 months or longer, fair value | 0 |
Temporarily impaired securities, 12 months or longer, unrealized losses | 0 |
Temporarily impaired securities, total fair value | 39,603 |
Temporarily impaired securities, total unrealized losses | 13 |
US Government Corporations and Agencies Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 0 | 0
Temporarily impaired securities, less than 12 months, unrealized losses | 0 | 0
Temporarily impaired securities, 12 months or longer, fair value | 2,221 | 2,337
Temporarily impaired securities, 12 months or longer, unrealized losses | 134 | 135
Temporarily impaired securities, total fair value | 2,221 | 2,337
Temporarily impaired securities, total unrealized losses | 134 | 135
Collateralized Mortgage-Backed Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 695,157 | 527,276
Temporarily impaired securities, less than 12 months, unrealized losses | 40,532 | 6,659
Temporarily impaired securities, 12 months or longer, fair value | 144,040 | 6,496
Temporarily impaired securities, 12 months or longer, unrealized losses | 15,912 | 755
Temporarily impaired securities, total fair value | 839,197 | 533,772
Temporarily impaired securities, total unrealized losses | 56,444 | 7,414
Collateralized Mortgage Obligations [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 8,274 | 8,989
Temporarily impaired securities, less than 12 months, unrealized losses | 879 | 417
Temporarily impaired securities, 12 months or longer, fair value | 114 | 128
Temporarily impaired securities, 12 months or longer, unrealized losses | 15 | 13
Temporarily impaired securities, total fair value | 8,388 | 9,117
Temporarily impaired securities, total unrealized losses | 894 | 430
Corporate Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 102,960 | 103,720
Temporarily impaired securities, less than 12 months, unrealized losses | 7,858 | 2,122
Temporarily impaired securities, 12 months or longer, fair value | 18,396 | 19,468
Temporarily impaired securities, 12 months or longer, unrealized losses | 1,604 | 532
Temporarily impaired securities, total fair value | 121,356 | 123,188
Temporarily impaired securities, total unrealized losses | $ 9,462 | $ 2,654

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