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Note 3 - Securities - Amortized Cost and Fair Value of Securities By Contractual Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Due in one year or less, amortized cost | $ 292,504 |
Due in one year or less, fair value | 292,073 |
Due after one year through five years, amortized cost | 64,975 |
Due after one year through five years | 64,696 |
Amortized cost, single maturity date, amortized cost | 357,479 |
Fair value, single maturity date | 356,769 |
Amortized cost | 361,290 | $ 156,750
Fair value | 360,530 | 153,203
Residential Mortgage-Backed Securities [Member] |  |
Amortized cost, without single maturity date, amortized cost | 2,949 |
Fair value, without single maturity date | 2,911 |
Amortized cost | 2,949 | 3,431
Fair value | 2,911 | 3,367
Collateralized Mortgage-Backed Securities [Member] |  |
Amortized cost, without single maturity date, amortized cost | 862 |
Fair value, without single maturity date | 850 |
Amortized cost | 862 | 1,023
Fair value | $ 850 | $ 1,003

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