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Note 3 - Securities - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
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Investments, Debt and Equity Securities [Abstract] |  |
Amortized cost, due in one year or less, available for sale securities | $ 23,709 |
Fair value, due in one year or less, available for sale securities | 23,484 |
Amortized cost, due after one year through five years, available for sale securities | 229,721 |
Fair value, due after one year through five years, available for sale securities | 218,251 |
Amortized cost, due after five years through ten years, available for sale securities | 221,520 |
Fair value, due after five years through ten years, available for sale securities | 195,181 |
Amortized cost, due after ten years, available for sale securities | 231,279 |
Fair value, due after ten years, available for sale securities | 217,461 |
Amortized cost, total securities available for sale | 706,229 | $ 680,496
Fair value, total securities available for sale | $ 654,377 | $ 601,898

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