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Note 6 - Debt Securities - Debt Securities Available-for-sale (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Due in one year or less, Amortized cost	$ 32,318
Due in one year or less, Estimated fair value	32,029
Due after one year through five years, Amortized cost	452,629
Due after one year through five years, Estimated fair value	414,093
Due after five years through ten years, Amortized cost	382,700
Due after five years through ten years, Estimated fair value	326,965
Due after ten years, Amortized cost	12,796
Due after ten years, Estimated fair value	10,880
Total, amortized cost	880,443	$ 827,185
Securities available-for-sale	$ 783,967	$ 831,003

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