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Note 3 - Investment Securities - Interest Income From Investment Securities (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Taxable | $ 41,280 | $ 54,145
Tax-exempt from regular federal income tax | 839 | 994
Total interest income from investment securities | $ 42,119 | $ 55,139

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