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Note 6 - Debt Securities - Debt Securities Available-for-sale (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Due in one year or less, Amortized cost	$ 57,814
Due in one year or less, Estimated fair value	58,258
Due after one year through five years, Amortized cost	295,926
Due after one year through five years, Estimated fair value	302,378
Due after five years through ten years, Amortized cost	337,265
Due after five years through ten years, Estimated fair value	342,042
Due after ten years, Amortized cost	36,552
Due after ten years, Estimated fair value	37,424
Total, amortized cost	727,557	$ 575,636
Securities available-for-sale	$ 740,102	$ 596,999

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