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Note 3 - Securities - Schedule of Securities in Unrealized Loss Positions (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Securities available for sale, fair value, less than 12 months | $ 70,400 | $ 170,520
Securities available for sale, accumulated loss, less than 12 months | (1,614) | (7,987)
Securities available for sale, fair value, more than 12 months | 1,019,106 | 1,034,046
Securities available for sale, accumulated loss, more than 12 months | (198,153) | (237,726)
Securities available for sale, fair value | 1,089,506 | 1,204,566
Securities available for sale, accumulated loss | (199,767) | (245,713)
US Treasury and Government [Member] |  |
Securities available for sale, fair value, less than 12 months | 1,060 | 4,592
Securities available for sale, accumulated loss, less than 12 months | (3) | (320)
Securities available for sale, fair value, more than 12 months | 92,690 | 110,515
Securities available for sale, accumulated loss, more than 12 months | (10,234) | (16,865)
Securities available for sale, fair value | 93,750 | 115,107
Securities available for sale, accumulated loss | (10,237) | (17,185)
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available for sale, fair value, less than 12 months | 21,246 | 66,436
Securities available for sale, accumulated loss, less than 12 months | (1,249) | (4,946)
Securities available for sale, fair value, more than 12 months | 420,822 | 400,911
Securities available for sale, accumulated loss, more than 12 months | (95,200) | (101,418)
Securities available for sale, fair value | 442,068 | 467,347
Securities available for sale, accumulated loss | (96,449) | (106,364)
Corporate Debt Securities [Member] |  |
Securities available for sale, fair value, less than 12 months | 4,247 | 4,303
Securities available for sale, accumulated loss, less than 12 months | (38) | (146)
Securities available for sale, fair value, more than 12 months | 8,029 | 8,568
Securities available for sale, accumulated loss, more than 12 months | (332) | (427)
Securities available for sale, fair value | 12,276 | 12,871
Securities available for sale, accumulated loss | (370) | (573)
Collateralized Mortgage-Backed Securities [Member] |  |
Securities available for sale, fair value, less than 12 months | 862 | 30,143
Securities available for sale, accumulated loss, less than 12 months | (23) | (365)
Securities available for sale, fair value, more than 12 months | 444,752 | 460,172
Securities available for sale, accumulated loss, more than 12 months | (87,055) | (112,152)
Securities available for sale, fair value | 445,614 | 490,315
Securities available for sale, accumulated loss | (87,078) | (112,517)
Collateralized Mortgage Obligations [Member] |  |
Securities available for sale, fair value, less than 12 months | 42,985 | 65,046
Securities available for sale, accumulated loss, less than 12 months | (301) | (2,210)
Securities available for sale, fair value, more than 12 months | 50,675 | 51,405
Securities available for sale, accumulated loss, more than 12 months | (5,167) | (6,624)
Securities available for sale, fair value | 93,660 | 116,451
Securities available for sale, accumulated loss | (5,468) | (8,834)
Small Business Administration [Member] |  |
Securities available for sale, fair value, less than 12 months | 0 | 0
Securities available for sale, accumulated loss, less than 12 months | 0 | 0
Securities available for sale, fair value, more than 12 months | 2,138 | 2,475
Securities available for sale, accumulated loss, more than 12 months | (165) | (240)
Securities available for sale, fair value | 2,138 | 2,475
Securities available for sale, accumulated loss | $ (165) | $ (240)

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