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Note 3 - Securities - Securities in a Continuous Loss Position (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Temporarily impaired securities, less than 12 months, fair value | $ 6,221 | $ 2,500
Temporarily impaired securities, less than 12 months unrealized loss | 146 | 27
Temporarily impaired securities, 12 months or more fair value | 577,726 | 615,242
Temporarily impaired securities, 12 months or more unrealized loss | 78,476 | 79,158
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 | 311,124 | 311,844
Temporarily impaired securities, 12 months or more unrealized loss | 40,012 | 42,060
US States and Political Subdivisions Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 885 | 884
Temporarily impaired securities, less than 12 months unrealized loss | 118 | 1
Temporarily impaired securities, 12 months or more fair value | 144,849 | 148,763
Temporarily impaired securities, 12 months or more unrealized loss | 32,254 | 29,613
Commercial Mortgage-Backed Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 5,336 | 1,616
Temporarily impaired securities, less than 12 months unrealized loss | 28 | 26
Temporarily impaired securities, 12 months or more fair value | 115,011 | 147,922
Temporarily impaired securities, 12 months or more unrealized loss | 5,445 | 6,698
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 | 5,743 | 5,750
Temporarily impaired securities, 12 months or more unrealized loss | 764 | 754
US Treasury 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 | 999 | 963
Temporarily impaired securities, 12 months or more unrealized loss | $ 1 | $ 33

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