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Note 4 - Securities - Securities in a Continuous Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Temporarily impaired securities, less than 12 months, fair value | $ 1,386 | $ 6,221
Temporarily impaired securities, less than 12 months unrealized loss | 18 | 146
Temporarily impaired securities, 12 months or more fair value | 569,840 | 577,726
Temporarily impaired securities, 12 months or more unrealized loss | 69,002 | 78,476
US Government Agencies Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 0 | 0
Temporarily impaired securities, less than 12 months unrealized loss | 0 | 0
Temporarily impaired securities, 12 months or more fair value | 306,927 | 311,124
Temporarily impaired securities, 12 months or more unrealized loss | 33,268 | 40,012
US States and Political Subdivisions Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 0 | 885
Temporarily impaired securities, less than 12 months unrealized loss | 0 | 118
Temporarily impaired securities, 12 months or more fair value | 147,612 | 144,849
Temporarily impaired securities, 12 months or more unrealized loss | 30,332 | 32,254
Commercial Mortgage-Backed Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 1,386 | 5,336
Temporarily impaired securities, less than 12 months unrealized loss | 18 | 28
Temporarily impaired securities, 12 months or more fair value | 109,515 | 115,011
Temporarily impaired securities, 12 months or more unrealized loss | 4,680 | 5,445
Corporate Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 0 | 0
Temporarily impaired securities, less than 12 months unrealized loss | 0 | 0
Temporarily impaired securities, 12 months or more fair value | 5,786 | 5,743
Temporarily impaired securities, 12 months or more unrealized loss | $ 722 | 764
US Treasury Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value |  | 0
Temporarily impaired securities, less than 12 months unrealized loss |  | 0
Temporarily impaired securities, 12 months or more fair value |  | 999
Temporarily impaired securities, 12 months or more unrealized loss |  | $ 1

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