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Note 3 - Investment Securities Available for Sale - Investment Securities With Unrealized Losses (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Less than 12 months fair value | $ 68,580 | $ 182,187
Less than 12 months unrealized losses | 1,134 | 3,093
12 months or more fair value | 204,803 | 200,701
12 months or more unrealized losses | 30,637 | 33,135
Total fair value | 273,383 | 382,888
Total unrealized losses | 31,771 | 36,228
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises [Member] |  |
Less than 12 months fair value | 37,229 | 107,328
Less than 12 months unrealized losses | 413 | 1,917
12 months or more fair value | 90,718 | 94,506
12 months or more unrealized losses | 10,804 | 13,539
Total fair value | 127,947 | 201,834
Total unrealized losses | 11,217 | 15,456
Commercial Mortgage Backed Securities Issued by US Government Agencies [Member] |  |
Less than 12 months fair value | 8,265 | 55,921
Less than 12 months unrealized losses | 54 | 926
12 months or more fair value | 66,204 | 57,735
12 months or more unrealized losses | 10,165 | 11,030
Total fair value | 74,469 | 113,656
Total unrealized losses | 10,219 | 11,956
US States and Political Subdivisions Debt Securities [Member] |  |
Less than 12 months fair value | 23,086 | 18,938
Less than 12 months unrealized losses | 667 | 250
12 months or more fair value | 47,881 | 48,460
12 months or more unrealized losses | 9,668 | 8,566
Total fair value | 70,967 | 67,398
Total unrealized losses | $ 10,335 | $ 8,816

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