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Note 8 - Investment Securities - Temporarily Impaired Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Temporarily impaired securities, less than 12 months, fair value | $ 973,769 | $ 639,985
Temporarily impaired securities, less than 12 months, unrealized losses | 75,681 | 9,198
Temporarily impaired securities, 12 months or longer, fair value | 180,404 | 28,429
Temporarily impaired securities, 12 months or longer, unrealized losses | 27,434 | 1,435
Temporarily impaired securities, total fair value | 1,154,173 | 668,414
Temporarily impaired securities, total unrealized losses | 103,115 | 10,633
US Treasury Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 118,998 |
Temporarily impaired securities, less than 12 months, unrealized losses | 825 |
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 | 118,998 |
Temporarily impaired securities, total unrealized losses | 825 |
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 | 2,184 | 2,337
Temporarily impaired securities, 12 months or longer, unrealized losses | 125 | 135
Temporarily impaired securities, total fair value | 2,184 | 2,337
Temporarily impaired securities, total unrealized losses | 125 | 135
Collateralized Mortgage-Backed Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 705,908 | 527,276
Temporarily impaired securities, less than 12 months, unrealized losses | 65,450 | 6,659
Temporarily impaired securities, 12 months or longer, fair value | 132,913 | 6,496
Temporarily impaired securities, 12 months or longer, unrealized losses | 22,948 | 755
Temporarily impaired securities, total fair value | 838,821 | 533,772
Temporarily impaired securities, total unrealized losses | 88,398 | 7,414
Collateralized Mortgage Obligations [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 14,793 | 8,989
Temporarily impaired securities, less than 12 months, unrealized losses | 163 | 417
Temporarily impaired securities, 12 months or longer, fair value | 7,787 | 128
Temporarily impaired securities, 12 months or longer, unrealized losses | 1,206 | 13
Temporarily impaired securities, total fair value | 22,580 | 9,117
Temporarily impaired securities, total unrealized losses | 1,369 | 430
Corporate Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 134,070 | 103,720
Temporarily impaired securities, less than 12 months, unrealized losses | 9,243 | 2,122
Temporarily impaired securities, 12 months or longer, fair value | 37,520 | 19,468
Temporarily impaired securities, 12 months or longer, unrealized losses | 3,155 | 532
Temporarily impaired securities, total fair value | 171,590 | 123,188
Temporarily impaired securities, total unrealized losses | $ 12,398 | $ 2,654

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