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Note 7 - Investment Securities - Temporarily Impaired Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Temporarily impaired securities, less than 12 months, fair value | $ 706,923 | $ 132,580
Temporarily impaired securities, less than 12 months, unrealized losses | 599 | 680
Temporarily impaired securities, 12 months or longer, fair value | 918,553 | 964,495
Temporarily impaired securities, 12 months or longer, unrealized losses | 131,075 | 121,345
Temporarily impaired securities, total fair value | 1,625,476 | 1,097,075
Temporarily impaired securities, total unrealized losses | 131,674 | 122,025
US Treasury Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 545,000 | 49,831
Temporarily impaired securities, less than 12 months, unrealized losses | 93 | 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 | 545,000 | 49,831
Temporarily impaired securities, total unrealized losses | 93 | 20
US Government Corporations and Agencies Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 1,303 | 18,301
Temporarily impaired securities, less than 12 months, unrealized losses | 1 | 108
Temporarily impaired securities, 12 months or longer, fair value | 2,426 | 1,313
Temporarily impaired securities, 12 months or longer, unrealized losses | 117 | 122
Temporarily impaired securities, total fair value | 3,729 | 19,614
Temporarily impaired securities, total unrealized losses | 118 | 230
US Government-sponsored Enterprises Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 79,734 |
Temporarily impaired securities, less than 12 months, unrealized losses | 51 |
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 | 79,734 |
Temporarily impaired securities, total unrealized losses | 51 |
Collateralized Mortgage-Backed Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 16,029 | 0
Temporarily impaired securities, less than 12 months, unrealized losses | 245 | 0
Temporarily impaired securities, 12 months or longer, fair value | 711,787 | 768,274
Temporarily impaired securities, 12 months or longer, unrealized losses | 117,461 | 106,442
Temporarily impaired securities, total fair value | 727,816 | 768,274
Temporarily impaired securities, total unrealized losses | 117,706 | 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 | 26,079 | 28,044
Temporarily impaired securities, 12 months or longer, unrealized losses | 3,472 | 3,194
Temporarily impaired securities, total fair value | 26,079 | 28,044
Temporarily impaired securities, total unrealized losses | 3,472 | 3,194
Corporate Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 64,857 | 64,448
Temporarily impaired securities, less than 12 months, unrealized losses | 209 | 552
Temporarily impaired securities, 12 months or longer, fair value | 178,261 | 166,864
Temporarily impaired securities, 12 months or longer, unrealized losses | 10,025 | 11,587
Temporarily impaired securities, total fair value | 243,118 | 231,312
Temporarily impaired securities, total unrealized losses | $ 10,234 | $ 12,139

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