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Note 7 - Investment Securities - Temporarily Impaired Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Temporarily impaired securities, less than 12 months, fair value | $ 525,046 | $ 132,580
Temporarily impaired securities, less than 12 months, unrealized losses | 718 | 680
Temporarily impaired securities, 12 months or longer, fair value | 934,725 | 964,495
Temporarily impaired securities, 12 months or longer, unrealized losses | 130,192 | 121,345
Temporarily impaired securities, total fair value | 1,459,771 | 1,097,075
Temporarily impaired securities, total unrealized losses | 130,910 | 122,025
US Treasury Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 392,376 | 49,831
Temporarily impaired securities, less than 12 months, unrealized losses | 120 | 20
Temporarily impaired securities, 12 months or longer, fair value | 0 | 0
Temporarily impaired securities, 12 months or longer, unrealized losses | 0 | 0
Temporarily impaired securities, total fair value | 392,376 | 49,831
Temporarily impaired securities, total unrealized losses | 120 | 20
US Government Corporations and Agencies Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 1,471 | 18,301
Temporarily impaired securities, less than 12 months, unrealized losses | 2 | 108
Temporarily impaired securities, 12 months or longer, fair value | 2,524 | 1,313
Temporarily impaired securities, 12 months or longer, unrealized losses | 124 | 122
Temporarily impaired securities, total fair value | 3,995 | 19,614
Temporarily impaired securities, total unrealized losses | 126 | 230
US Government-sponsored Enterprises Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 59,745 |
Temporarily impaired securities, less than 12 months, unrealized losses | 40 |
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 | 59,745 |
Temporarily impaired securities, total unrealized losses | 40 |
Collateralized Mortgage-Backed Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 16,923 | 0
Temporarily impaired securities, less than 12 months, unrealized losses | 87 | 0
Temporarily impaired securities, 12 months or longer, fair value | 736,362 | 768,274
Temporarily impaired securities, 12 months or longer, unrealized losses | 117,045 | 106,442
Temporarily impaired securities, total fair value | 753,285 | 768,274
Temporarily impaired securities, total unrealized losses | 117,132 | 106,442
Collateralized Mortgage Obligations [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 | 27,198 | 28,044
Temporarily impaired securities, 12 months or longer, unrealized losses | 3,296 | 3,194
Temporarily impaired securities, total fair value | 27,198 | 28,044
Temporarily impaired securities, total unrealized losses | 3,296 | 3,194
Corporate Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 54,531 | 64,448
Temporarily impaired securities, less than 12 months, unrealized losses | 469 | 552
Temporarily impaired securities, 12 months or longer, fair value | 168,641 | 166,864
Temporarily impaired securities, 12 months or longer, unrealized losses | 9,727 | 11,587
Temporarily impaired securities, total fair value | 223,172 | 231,312
Temporarily impaired securities, total unrealized losses | $ 10,196 | $ 12,139

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