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Note 2 - Investment Securities - Securities With Unrealized Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Securities available-for-sale, less than 12 months, fair value | $ 1,174 | $ 38,141
Securities HTM, less than 12 months, fair value | 0 | 396
Securities available-for-sale, less than 12 months, unrealized losses | (1) | (792)
Securities HTM, less than 12 months, unrealized losses | 0 | (6)
Securities available-for-sale, 12 months or more, fair value | 694,100 | 746,233
Securities HTM, 12 months or more, fair value | 183,379 | 340,798
Securities available-for-sale, 12 months or more, unrealized losses | (88,133) | (124,199)
Securities HTM, 12 months or more, unrealized losses | (19,311) | (28,810)
Securities available-for-sale, fair value | 695,274 | 784,374
Securities HTM, fair value | 183,379 | 341,194
Securities available-for-sale, unrealized losses | (88,134) | (124,991)
Securities HTM, unrealized losses | (19,311) | (28,816)
US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities available-for-sale, less than 12 months, fair value | 0 | 5,801
Securities HTM, less than 12 months, fair value | 0 | 396
Securities available-for-sale, less than 12 months, unrealized losses | 0 | (49)
Securities HTM, less than 12 months, unrealized losses | 0 | (6)
Securities available-for-sale, 12 months or more, fair value | 70,992 | 74,478
Securities HTM, 12 months or more, fair value | 21,713 | 22,965
Securities available-for-sale, 12 months or more, unrealized losses | (3,088) | (4,798)
Securities HTM, 12 months or more, unrealized losses | (1,285) | (2,028)
Securities available-for-sale, fair value | 70,992 | 80,279
Securities HTM, fair value | 21,713 | 23,361
Securities available-for-sale, unrealized losses | (3,088) | (4,847)
Securities HTM, unrealized losses | (1,285) | (2,034)
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 | 1,965 | 153,109
Securities HTM, 12 months or more, unrealized losses | (25) | (741)
Securities HTM, fair value | 1,965 | 153,109
Securities HTM, unrealized losses | (25) | (741)
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] |  |
Securities available-for-sale, less than 12 months, fair value | 0 | 23,159
Securities HTM, less than 12 months, fair value | 0 | 0
Securities available-for-sale, less than 12 months, unrealized losses | 0 | (579)
Securities HTM, less than 12 months, unrealized losses | 0 | 0
Securities available-for-sale, 12 months or more, fair value | 528,631 | 567,818
Securities HTM, 12 months or more, fair value | 159,701 | 164,724
Securities available-for-sale, 12 months or more, unrealized losses | (74,850) | (105,211)
Securities HTM, 12 months or more, unrealized losses | (18,001) | (26,041)
Securities available-for-sale, fair value | 528,631 | 590,977
Securities HTM, fair value | 159,701 | 164,724
Securities available-for-sale, unrealized losses | (74,850) | (105,790)
Securities HTM, unrealized losses | (18,001) | (26,041)
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available-for-sale, less than 12 months, fair value | 1,174 | 9,181
Securities available-for-sale, less than 12 months, unrealized losses | (1) | (164)
Securities available-for-sale, 12 months or more, fair value | 93,924 | 101,407
Securities available-for-sale, 12 months or more, unrealized losses | (10,153) | (14,034)
Securities available-for-sale, fair value | 95,098 | 110,588
Securities available-for-sale, unrealized losses | (10,154) | (14,198)
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 | 553 | 2,530
Securities available-for-sale, 12 months or more, unrealized losses | (42) | (156)
Securities available-for-sale, fair value | 553 | 2,530
Securities available-for-sale, unrealized losses | $ (42) | $ (156)

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