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Note 3 - Securities - Securities With Unrealized Losses (Details) $ in Thousands | Jun. 30, 2025 USD ($) | Mar. 31, 2025 USD ($) | Dec. 31, 2024 USD ($)
--- | --- | --- | ---
Count, less than 12 months | 22 |  | 10
Fair value, less than 12 months | $ 218,088 |  | $ 79,872
Unrealized loss, less than 12 months | $ (41) |  | $ (128)
Count, 12 months or more | 47 |  | 85
Fair value, 12 months or more | $ 18,228 |  | $ 50,823
Unrealized loss, 12 months or more | $ (241) |  | $ (770)
Count, total | 69 |  | 95
Fair value, total | $ 236,316 |  | $ 130,695
Unrealized loss, total | $ (282) |  | $ (898)
US Treasury Securities [Member] |  |  |
Count, less than 12 months | 22 |  | 0
Fair value, less than 12 months | $ 218,088 |  | $ 0
Unrealized loss, less than 12 months | $ (41) |  | $ 0
Count, 12 months or more | 37 |  | 73
Fair value, 12 months or more | $ 16,292 |  | $ 48,609
Unrealized loss, 12 months or more | $ (175) |  | $ (689)
Count, total | 59 |  | 73
Fair value, total | $ 234,380 |  | $ 48,609
Unrealized loss, total | $ (216) |  | $ (689)
Residential Mortgage-Backed Securities [Member] |  |  |
Count, less than 12 months | 0 |  | 0
Fair value, less than 12 months | $ 0 |  | $ 0
Unrealized loss, less than 12 months | $ 0 |  | $ 0
Count, 12 months or more | 5 |  | 7
Fair value, 12 months or more | $ 1,146 |  | $ 1,364
Unrealized loss, 12 months or more | $ (55) |  | $ (69)
Count, total | 5 |  | 7
Fair value, total | $ 1,146 |  | $ 1,364
Unrealized loss, total | $ (55) |  | $ (69)
Collateralized Mortgage-Backed Securities [Member] |  |  |
Count, less than 12 months | 0 |  | 0
Fair value, less than 12 months | $ 0 |  | $ 0
Unrealized loss, less than 12 months | $ 0 |  | $ 0
Count, 12 months or more | 5 |  | 5
Fair value, 12 months or more | $ 790 |  | $ 850
Unrealized loss, 12 months or more | $ (11) |  | $ (12)
Count, total | 5 |  | 5
Fair value, total | $ 790 |  | $ 850
Unrealized loss, total | $ (11) |  | $ (12)
US Government-sponsored Enterprises Debt Securities [Member] |  |  |
Count, less than 12 months |  | 10 |
Fair value, less than 12 months |  | $ 79,872 |
Unrealized loss, less than 12 months |  | $ (128) |
Count, 12 months or more |  | 0 |
Fair value, 12 months or more |  | $ 0 |
Unrealized loss, 12 months or more |  | $ 0 |
Count, total |  | 10 |
Fair value, total |  | $ 79,872 |
Unrealized loss, total |  | $ (128) |

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