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Note 3 - Investment Securities Available for Sale - Investment Securities With Unrealized Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Less than 12 months fair value | $ 28,449 | $ 182,187
Less than 12 months unrealized losses | 257 | 3,093
12 months or more fair value | 204,764 | 200,701
12 months or more unrealized losses | 27,309 | 33,135
Total fair value | 233,213 | 382,888
Total unrealized losses | 27,566 | 36,228
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises [Member] |  |
Less than 12 months fair value | 5,916 | 107,328
Less than 12 months unrealized losses | 22 | 1,917
12 months or more fair value | 92,489 | 94,506
12 months or more unrealized losses | 9,726 | 13,539
Total fair value | 98,405 | 201,834
Total unrealized losses | 9,748 | 15,456
Commercial Mortgage Backed Securities Issued by US Government Agencies [Member] |  |
Less than 12 months fair value | 8,193 | 55,921
Less than 12 months unrealized losses | 36 | 926
12 months or more fair value | 64,400 | 57,735
12 months or more unrealized losses | 9,893 | 11,030
Total fair value | 72,593 | 113,656
Total unrealized losses | 9,929 | 11,956
US States and Political Subdivisions Debt Securities [Member] |  |
Less than 12 months fair value | 14,340 | 18,938
Less than 12 months unrealized losses | 199 | 250
12 months or more fair value | 47,875 | 48,460
12 months or more unrealized losses | 7,690 | 8,566
Total fair value | 62,215 | 67,398
Total unrealized losses | $ 7,889 | $ 8,816

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