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Note 7 - Investment Securities - Temporarily Impaired Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Temporarily impaired securities, less than 12 months, fair value | $ 21,164 | $ 132,580
Temporarily impaired securities, less than 12 months, unrealized losses | 27 | 680
Temporarily impaired securities, 12 months or longer, fair value | 877,147 | 964,495
Temporarily impaired securities, 12 months or longer, unrealized losses | 95,562 | 121,345
Temporarily impaired securities, total fair value | 898,311 | 1,097,075
Temporarily impaired securities, total unrealized losses | 95,589 | 122,025
US Treasury Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value |  | 49,831
Temporarily impaired securities, less than 12 months, unrealized losses |  | 20
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 |  | 49,831
Temporarily impaired securities, total unrealized losses |  | 20
US Government Corporations and Agencies Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 1,182 | 18,301
Temporarily impaired securities, less than 12 months, unrealized losses | 1 | 108
Temporarily impaired securities, 12 months or longer, fair value | 2,223 | 1,313
Temporarily impaired securities, 12 months or longer, unrealized losses | 115 | 122
Temporarily impaired securities, total fair value | 3,405 | 19,614
Temporarily impaired securities, total unrealized losses | 116 | 230
Collateralized Mortgage-Backed Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 8 | 0
Temporarily impaired securities, less than 12 months, unrealized losses | 0 | 0
Temporarily impaired securities, 12 months or longer, fair value | 701,624 | 768,274
Temporarily impaired securities, 12 months or longer, unrealized losses | 86,882 | 106,442
Temporarily impaired securities, total fair value | 701,632 | 768,274
Temporarily impaired securities, total unrealized losses | 86,882 | 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 | 26,434 | 28,044
Temporarily impaired securities, 12 months or longer, unrealized losses | 2,229 | 3,194
Temporarily impaired securities, total fair value | 26,434 | 28,044
Temporarily impaired securities, total unrealized losses | 2,229 | 3,194
Corporate Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 19,974 | 64,448
Temporarily impaired securities, less than 12 months, unrealized losses | 26 | 552
Temporarily impaired securities, 12 months or longer, fair value | 146,866 | 166,864
Temporarily impaired securities, 12 months or longer, unrealized losses | 6,336 | 11,587
Temporarily impaired securities, total fair value | 166,840 | 231,312
Temporarily impaired securities, total unrealized losses | $ 6,362 | $ 12,139

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