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Note 6 - Securities - Estimated Fair Value of Available for Sale Securities, by Contractual Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Due in one year or less, cost basis | $ 690 |
Available for sale securities, due in one year or less, estimated fair value | 688 |
Due from one to five years, cost basis | 10,293 |
Available for sale securities, due from one to five years, estimated fair value | 8,853 |
Due from five to ten years, cost basis | 21,761 |
Available for sale securities, due from five to ten years, estimated fair value | 19,048 |
Due over ten years, cost basis | 258,149 |
Available for sale securities, due over ten years, estimated fair value | 191,595 |
Collateralized mortgage obligations and residential mortgage-backed securities, cost basis | 152,118 |
Collateralized mortgage obligations and residential mortgage-backed securities, estimated fair value | 119,096 |
Available for sale securities, cost basis | 443,011 | $ 455,477
Total securities available-for-sale | $ 339,280 | $ 370,896

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