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Note 6 - Securities - Estimated Fair Value of Available for Sale Securities, by Contractual Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Due in one year or less, cost basis | $ 795 |
Available for sale securities, due in one year or less, estimated fair value | 795 |
Due from one to five years, cost basis | 7,062 |
Available for sale securities, due from one to five years, estimated fair value | 6,363 |
Due from five to ten years, cost basis | 20,004 |
Available for sale securities, due from five to ten years, estimated fair value | 18,548 |
Due over ten years, cost basis | 264,188 |
Available for sale securities, due over ten years, estimated fair value | 218,886 |
Collateralized mortgage obligations and residential mortgage-backed securities, cost basis | 159,376 |
Collateralized mortgage obligations and residential mortgage-backed securities, estimated fair value | 133,309 |
Available for sale securities, cost basis | 451,425 | $ 455,477
Available for sale securities, estimated fair value | $ 377,901 | $ 370,896

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 + Details
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