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Note 3 - Debt Securities Available for Sale and Held to Maturity - Interest Income From Investment Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Taxable | $ 38,402 | $ 48,699 | $ 118,529 | $ 154,648
Tax-exempt from regular federal income tax | 735 | 892 | 2,398 | 2,839
Total interest income from investment securities | $ 39,137 | $ 49,591 | $ 120,927 | $ 157,487

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