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Note 3 - Investment Securities - Temporarily Impaired Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Temporarily impaired securities, less than 12 months, fair value | $ 59,054 | $ 132,580
Temporarily impaired securities, less than 12 months, unrealized losses | 1,067 | 680
Temporarily impaired securities, 12 months or longer, fair value | 807,644 | 964,495
Temporarily impaired securities, 12 months or longer, unrealized losses | 120,978 | 121,345
Temporarily impaired securities, total fair value | 866,698 | 1,097,075
Temporarily impaired securities, total unrealized losses | 122,045 | 122,025
US Government Corporations and Agencies Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 4,199 | 18,301
Temporarily impaired securities, less than 12 months, unrealized losses | 8 | 108
Temporarily impaired securities, 12 months or longer, fair value | 2,108 | 1,313
Temporarily impaired securities, 12 months or longer, unrealized losses | 119 | 122
Temporarily impaired securities, total fair value | 6,307 | 19,614
Temporarily impaired securities, total unrealized losses | 127 | 230
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
Collateralized Mortgage-Backed Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 29,955 | 0
Temporarily impaired securities, less than 12 months, unrealized losses | 959 | 0
Temporarily impaired securities, 12 months or longer, fair value | 653,236 | 768,274
Temporarily impaired securities, 12 months or longer, unrealized losses | 112,237 | 106,442
Temporarily impaired securities, total fair value | 683,191 | 768,274
Temporarily impaired securities, total unrealized losses | 113,196 | 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 | 24,556 | 28,044
Temporarily impaired securities, 12 months or longer, unrealized losses | 3,191 | 3,194
Temporarily impaired securities, total fair value | 24,556 | 28,044
Temporarily impaired securities, total unrealized losses | 3,191 | 3,194
Corporate Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 24,900 | 64,448
Temporarily impaired securities, less than 12 months, unrealized losses | 100 | 552
Temporarily impaired securities, 12 months or longer, fair value | 127,744 | 166,864
Temporarily impaired securities, 12 months or longer, unrealized losses | 5,431 | 11,587
Temporarily impaired securities, total fair value | 152,644 | 231,312
Temporarily impaired securities, total unrealized losses | $ 5,531 | $ 12,139

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