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Note 2 - Investment Securities - Securities With Unrealized Losses (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025
--- | --- | ---
Securities available-for-sale, less than 12 months, fair value | $ 38,639 | $ 1,446
Securities HTM, less than 12 months, fair value | 0 | 0
Securities available-for-sale, less than 12 months, unrealized losses | (473) | (4)
Securities HTM, less than 12 months, unrealized losses | 0 | 0
Securities available-for-sale, 12 months or more, fair value | 616,358 | 669,061
Securities HTM, 12 months or more, fair value | 174,743 | 180,508
Securities available-for-sale, 12 months or more, unrealized losses | (80,613) | (79,685)
Securities HTM, 12 months or more, unrealized losses | (17,705) | (17,748)
Securities available-for-sale, fair value | 654,997 | 670,507
Securities HTM, fair value | 174,743 | 180,508
Securities available-for-sale, unrealized losses | (81,086) | (79,689)
Securities HTM, unrealized losses | (17,705) | (17,748)
US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities available-for-sale, less than 12 months, fair value | 0 | 0
Securities HTM, less than 12 months, fair value | 0 | 0
Securities available-for-sale, less than 12 months, unrealized losses | 0 | 0
Securities HTM, less than 12 months, unrealized losses | 0 | 0
Securities available-for-sale, 12 months or more, fair value | 62,453 | 69,880
Securities HTM, 12 months or more, fair value | 19,669 | 21,649
Securities available-for-sale, 12 months or more, unrealized losses | (2,700) | (2,737)
Securities HTM, 12 months or more, unrealized losses | (1,252) | (1,112)
Securities available-for-sale, fair value | 62,453 | 69,880
Securities HTM, fair value | 19,669 | 21,649
Securities available-for-sale, unrealized losses | (2,700) | (2,737)
Securities HTM, unrealized losses | (1,252) | (1,112)
US Treasury Securities and US Government Agencies Debt Securities [Member] |  |
Securities HTM, less than 12 months, fair value | 0 | 0
Securities HTM, less than 12 months, unrealized losses | 0 | 0
Securities HTM, 12 months or more, fair value | 1,995 | 1,982
Securities HTM, 12 months or more, unrealized losses | (3) | (12)
Securities HTM, fair value | 1,995 | 1,982
Securities HTM, unrealized losses | (3) | (12)
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] |  |
Securities available-for-sale, less than 12 months, fair value | 25,720 | 0
Securities HTM, less than 12 months, fair value | 0 | 0
Securities available-for-sale, less than 12 months, unrealized losses | (274) | 0
Securities HTM, less than 12 months, unrealized losses | 0 | 0
Securities available-for-sale, 12 months or more, fair value | 473,048 | 507,041
Securities HTM, 12 months or more, fair value | 153,079 | 156,877
Securities available-for-sale, 12 months or more, unrealized losses | (68,078) | (67,576)
Securities HTM, 12 months or more, unrealized losses | (16,450) | (16,624)
Securities available-for-sale, fair value | 498,768 | 507,041
Securities HTM, fair value | 153,079 | 156,877
Securities available-for-sale, unrealized losses | (68,352) | (67,576)
Securities HTM, unrealized losses | (16,450) | (16,624)
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available-for-sale, less than 12 months, fair value | 12,919 | 1,446
Securities available-for-sale, less than 12 months, unrealized losses | (199) | (4)
Securities available-for-sale, 12 months or more, fair value | 80,355 | 91,609
Securities available-for-sale, 12 months or more, unrealized losses | (9,797) | (9,335)
Securities available-for-sale, fair value | 93,274 | 93,055
Securities available-for-sale, unrealized losses | (9,996) | (9,339)
Other Debt Obligations [Member] |  |
Securities available-for-sale, less than 12 months, fair value | 0 | 0
Securities available-for-sale, less than 12 months, unrealized losses | 0 | 0
Securities available-for-sale, 12 months or more, fair value | 502 | 531
Securities available-for-sale, 12 months or more, unrealized losses | (38) | (37)
Securities available-for-sale, fair value | 502 | 531
Securities available-for-sale, unrealized losses | $ (38) | $ (37)

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