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Note 4 - Investment Securities - Schedule of Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Due within one year or less, Held-to-maturity, Amortized Cost | $ 8,282 |
Due within one year or less, Held-to-maturity, Fair Value | 8,203 |
Due within one year or less, Available-for-sale, Amortized Cost | 0 |
Due within one year or less, Available-for-sale, Fair Value | 0 |
Due after one year through five years, Held-to-maturity, Amortized Cost | 56,385 |
Due after one year through five years, Held-to-maturity, Fair Value | 53,122 |
Due after one year through five years, Available-for-sale, Amortized Cost | 1,838 |
Due after one year through five years, Available-for-sale, Fair Value | 1,778 |
Due after five years through ten years, Held-to-maturity, Amortized Cost | 48,042 |
Due after five years through ten years, Held-to-maturity, Fair Value | 43,323 |
Due after five years through ten years, Available-for-sale, Amortized Cost | 57,992 |
Due after five years through ten years, Available-for-sale, Fair Value | 49,460 |
Due after 10 years, Held-to-maturity, Amortized Cost | 10,008 |
Due after 10 years, Held-to-maturity, Fair Value | 8,945 |
Due after 10 years, Available-for-sale, Amortized Cost | 377 |
Due after 10 years, Available-for-sale, Fair Value | 377 |
Held-to-maturity, Amortized Cost | 122,717 |
Held-to-maturity, Fair Value | 113,593 |
Available-for-sale, Amortized Cost | 60,207 |
Available-for-sale, Fair Value | 51,615 |
Total investment securities | 282,050 |
Total investment securities, Held-to-maturity, Fair Value | 249,862 | $ 258,617
Total investment securities, Available-for-sale, Amortized Cost | 549,122 |
Total investment securities, Available-for-sale, Fair Value | 466,003 | 486,736
Residential Mortgage-Backed Securities [Member] |  |
Residential agency, Held-to-maturity, Amortized Cost | 159,333 |
Residential agency, Held-to-maturity, Fair Value | 136,269 |
Residential agency, Available-for-sale, Amortized Cost | 488,915 |
Residential agency, Available-for-sale, Fair Value | 414,388 |
Total investment securities, Held-to-maturity, Fair Value | 136,269 | 141,627
Total investment securities, Available-for-sale, Fair Value | $ 414,388 | $ 435,594

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