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Note 3 - Securities - Amortized Cost and Estimated Fair Values of Debt Securities (2) (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Due in one year or less, amortized cost	$ 89,461
Due in one year or less, fair value	86,651
Due after one year through five years, amortized cost	155,826
Due after one year through five years, fair value	153,114
Due after five years through ten years, amortized cost	185,793
Due after five years through ten years, fair value	172,544
Due after ten years, amortized cost	108,310
Due after ten years, fair value	105,023
Available-for-sale securities, amortized cost	539,390	$ 545,274
Securities - available for sale	$ 517,332	$ 518,078

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