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Note 6 - Debt Securities - Debt Securities Available-for-sale (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Due in one year or less, Amortized cost	$ 93,493
Due in one year or less, Estimated fair value	91,733
Due after one year through five years, Amortized cost	387,739
Due after one year through five years, Estimated fair value	361,233
Due after five years through ten years, Amortized cost	183,240
Due after five years through ten years, Estimated fair value	163,988
Due after ten years, Amortized cost	8,965
Due after ten years, Estimated fair value	8,092
Securities, amortized cost	673,437
Securities, fair value	625,046
U.S. government mortgage-backed securities, amortized cost	112,244
U.S. government mortgage-backed securities, fair value	98,159
Total, amortized cost	785,681	$ 798,703
Securities available-for-sale	$ 723,205	$ 736,389

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