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Note 4 - Securities - Securities in a Continuous Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Temporarily impaired securities, less than 12 months, fair value | $ 927 | $ 2,500
Temporarily impaired securities, less than 12 months unrealized loss | 78 | 27
Temporarily impaired securities, 12 months or more fair value | 598,970 | 615,242
Temporarily impaired securities, 12 months or more unrealized loss | 63,176 | 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 | 320,432 | 311,844
Temporarily impaired securities, 12 months or more unrealized loss | 32,645 | 42,060
US States and Political Subdivisions Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 924 | 884
Temporarily impaired securities, less than 12 months unrealized loss | 78 | 1
Temporarily impaired securities, 12 months or more fair value | 151,803 | 148,763
Temporarily impaired securities, 12 months or more unrealized loss | 25,464 | 29,613
Commercial Mortgage-Backed Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 3 | 1,616
Temporarily impaired securities, less than 12 months unrealized loss | 0 | 26
Temporarily impaired securities, 12 months or more fair value | 119,869 | 147,922
Temporarily impaired securities, 12 months or more unrealized loss | 4,427 | 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 | 5,876 | 5,750
Temporarily impaired securities, 12 months or more unrealized loss | 631 | 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 | 990 | 963
Temporarily impaired securities, 12 months or more unrealized loss | $ 9 | $ 33

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