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Note 4 - Securities - Securities in a Continuous Loss Position (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Temporarily impaired securities, less than 12 months, fair value | $ 1,402 | $ 2,500
Temporarily impaired securities, less than 12 months unrealized loss | 121 | 27
Temporarily impaired securities, 12 months or more fair value | 582,519 | 615,242
Temporarily impaired securities, 12 months or more unrealized loss | 83,506 | 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 | 308,813 | 311,844
Temporarily impaired securities, 12 months or more unrealized loss | 44,205 | 42,060
US States and Political Subdivisions Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 882 | 884
Temporarily impaired securities, less than 12 months unrealized loss | 120 | 1
Temporarily impaired securities, 12 months or more fair value | 145,120 | 148,763
Temporarily impaired securities, 12 months or more unrealized loss | 32,313 | 29,613
Commercial Mortgage-Backed Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 520 | 1,616
Temporarily impaired securities, less than 12 months unrealized loss | 1 | 26
Temporarily impaired securities, 12 months or more fair value | 121,951 | 147,922
Temporarily impaired securities, 12 months or more unrealized loss | 6,119 | 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 | 5,657 | 5,750
Temporarily impaired securities, 12 months or more unrealized loss | 849 | 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 | 978 | 963
Temporarily impaired securities, 12 months or more unrealized loss | $ 20 | $ 33

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