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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, 2023 | Dec. 31, 2022
--- | --- | ---
Securities available for sale, amortized cost, due in one year or less | $ 65,774 |
Securities available for sale, fair value, due in one year or less | 64,401 |
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 | 177,859 |
Securities available for sale, fair value, due after one year through five years | 163,024 |
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 years | 45,517 |
Securities available for sale, fair value, due after five years through ten years | 41,252 |
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 | 1,291 |
Securities available for sale, amortized cost, due after ten years | 92,213 |
Securities available for sale, fair value, due after ten years | 76,515 |
Securities held to maturity, amortized cost, due after ten years | 5,000 |
Securities held to maturity, fair value, due after ten years | 3,181 |
Securities available for sale, amortized cost, single maturity | 381,363 |
Securities available for sale, fair value, single maturity | 345,192 |
Securities held to maturity, amortized cost, single maturity | 7,000 |
Securities held to maturity, fair value, single maturity | 4,472 |
Mortgage-backed securities and CMO, amortized cost | 107,824 |
Mortgage-backed securities and CMO, fair value | 94,888 |
Mortgage-backed securities and CMO, amortized cost | 0 |
Mortgage-backed securities and CMO, fair value | 0 |
Securities available for sale, amortized cost | 489,187 | $ 507,466
Securities available for sale, fair value | 440,080 | 460,819
Securities held to maturity, amortized cost | 7,000 | 7,000
Securities held to maturity, fair value | $ 4,472 | $ 5,311

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