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Note 3 - Investment Securities - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Securities available for sale, amortized cost, due in one year or less | $ 67,535 |
Securities available for sale, fair value, due in one year or less | 65,951 |
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 after one year through five years | 149,731 |
Securities available for sale, fair value, due after one year through five years | 140,052 |
Securities held to maturity, amortized cost, due after one year through five years | 0 |
Securities held to maturity, fair value, due after one year through five years | 0 |
Securities available for sale, amortized cost, due after five years through ten year | 41,277 |
Securities available for sale, fair value, due after five years through ten years | 38,658 |
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 | 1,270 |
Securities available for sale, amortized cost, due after ten years | 76,695 |
Securities available for sale, fair value, due after ten years | 67,296 |
Securities held to maturity, amortized cost, due after ten years | 5,000 |
Securities held to maturity, fair value, due after ten years | 3,135 |
Securities available for sale, amortized cost, single maturity | 335,238 |
Securities available for sale, fair value, single maturity | 311,957 |
Securities held to maturity, amortized cost, single maturity | 7,000 |
Securities held to maturity, fair value, single maturity | 4,405 |
Mortgage-backed securities and CMO, amortized cost | 126,257 |
Mortgage-backed securities and CMO, fair value | 116,187 |
Mortgage-backed securities and CMO, amortized cost | 0 |
Mortgage-backed securities and CMO, fair value | 0 |
Securities available for sale, amortized cost | 461,495 | $ 468,549
Securities available for sale, fair value | 428,144 | 437,271
Securities held to maturity, amortized cost | 7,000 | 7,000
Securities held to maturity, fair value | $ 4,405 | $ 4,446

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