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Note 3 - Investment Securities - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Securities available for sale, amortized cost, due in one year or less | $ 60,809 |
Securities available for sale, fair value, due in one year or less | 59,782 |
Securities held to maturity, amortized cost, due in one year or less | 0 |
Securities held to maturity, fair value, due in one year or less | 0 |
Securities available for sale, amortized cost, due in one year through five years | 123,645 |
Securities available for sale, fair value, due in one year through five years | 118,416 |
Securities held to maturity, amortized cost, due in one year through five years | 0 |
Securities held to maturity, fair value, due in one year through five years | 0 |
Securities available for sale, amortized cost, due after five years through ten years | 52,663 |
Securities available for sale, fair value, due after five years through ten years | 49,010 |
Securities held to maturity, amortized cost, due after five years through ten years | 2,000 |
Securities held to maturity, fair value, due after five years through ten years | 1,354 |
Securities available for sale, amortized cost, due after ten years | 70,168 |
Securities available for sale, fair value, due after ten years | 62,437 |
Securities held to maturity, amortized cost, due after ten years | 5,000 |
Securities held to maturity, fair value, due after ten years | 3,334 |
Securities available for sale, amortized cost, allocated and single maturity date | 307,285 |
Securities available for sale, fair value, allocated and single maturity date | 289,645 |
Securities held to maturity, amortized cost, allocated and single maturity date | 7,000 |
Securities held to maturity, fair value, allocated and single maturity date | 4,688 |
Securities available for sale, amortized cost, without single maturity date | 125,120 |
Securities available for sale, fair value, without single maturity date | 118,824 |
Securities held to maturity, amortized cost, without single maturity date | 0 |
Securities held to maturity, fair value, without single maturity date | 0 |
Securities available for sale, amortized cost | 432,405 | $ 468,549
Securities available for sale, fair value | 408,469 | 437,271
Securities held to maturity, amortized cost | 7,000 | 7,000
Securities held to maturity, fair value | $ 4,688 | $ 4,446

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