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Note 6 - Debt Securities - Debt Securities Available-for-sale (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Due in one year or less, Amortized cost	$ 47,083
Due in one year or less, Estimated fair value	47,560
Due after one year through five years, Amortized cost	353,573
Due after one year through five years, Estimated fair value	358,552
Due after five years through ten years, Amortized cost	321,680
Due after five years through ten years, Estimated fair value	326,523
Due after ten years, Amortized cost	32,073
Due after ten years, Estimated fair value	32,788
Total, amortized cost	754,409	$ 575,636
Securities available-for-sale	$ 765,423	$ 596,999

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