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Note 2 - Investment Securities - Securities With Unrealized Losses (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Securities available-for-sale, less than 12 months, fair value | $ 281,457 | $ 38,141
Securities HTM, less than 12 months, fair value | 539 | 396
Securities available-for-sale, less than 12 months, unrealized losses | (417) | (792)
Securities HTM, less than 12 months, unrealized losses | (7) | (6)
Securities available-for-sale, 12 months or more, fair value | 737,319 | 746,233
Securities HTM, 12 months or more, fair value | 188,149 | 340,798
Securities available-for-sale, 12 months or more, unrealized losses | (106,052) | (124,199)
Securities HTM, 12 months or more, unrealized losses | (23,430) | (28,810)
Securities available-for-sale, fair value | 1,018,776 | 784,374
Securities HTM, fair value | 188,688 | 341,194
Securities available-for-sale, unrealized losses | (106,469) | (124,991)
Securities HTM, unrealized losses | (23,437) | (28,816)
US Treasury Securities and US Government Agencies Debt Securities [Member] |  |
Securities available-for-sale, less than 12 months, fair value | 247,821 |
Securities HTM, less than 12 months, fair value | 0 | 0
Securities available-for-sale, less than 12 months, unrealized losses | (14) |
Securities HTM, less than 12 months, unrealized losses | 0 | 0
Securities available-for-sale, 12 months or more, fair value | 0 |
Securities HTM, 12 months or more, fair value | 1,931 | 153,109
Securities available-for-sale, 12 months or more, unrealized losses | 0 |
Securities HTM, 12 months or more, unrealized losses | (50) | (741)
Securities available-for-sale, fair value | 247,821 |
Securities HTM, fair value | 1,931 | 153,109
Securities available-for-sale, unrealized losses | (14) |
Securities HTM, unrealized losses | (50) | (741)
US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities available-for-sale, less than 12 months, fair value | 5,713 | 5,801
Securities HTM, less than 12 months, fair value | 388 | 396
Securities available-for-sale, less than 12 months, unrealized losses | (48) | (49)
Securities HTM, less than 12 months, unrealized losses | (6) | (6)
Securities available-for-sale, 12 months or more, fair value | 72,185 | 74,478
Securities HTM, 12 months or more, fair value | 21,479 | 22,965
Securities available-for-sale, 12 months or more, unrealized losses | (3,786) | (4,798)
Securities HTM, 12 months or more, unrealized losses | (1,594) | (2,028)
Securities available-for-sale, fair value | 77,898 | 80,279
Securities HTM, fair value | 21,867 | 23,361
Securities available-for-sale, unrealized losses | (3,834) | (4,847)
Securities HTM, unrealized losses | (1,600) | (2,034)
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] |  |
Securities available-for-sale, less than 12 months, fair value | 18,016 | 23,159
Securities HTM, less than 12 months, fair value | 151 | 0
Securities available-for-sale, less than 12 months, unrealized losses | (212) | (579)
Securities HTM, less than 12 months, unrealized losses | (1) | 0
Securities available-for-sale, 12 months or more, fair value | 564,784 | 567,818
Securities HTM, 12 months or more, fair value | 164,739 | 164,724
Securities available-for-sale, 12 months or more, unrealized losses | (89,122) | (105,211)
Securities HTM, 12 months or more, unrealized losses | (21,786) | (26,041)
Securities available-for-sale, fair value | 582,800 | 590,977
Securities HTM, fair value | 164,890 | 164,724
Securities available-for-sale, unrealized losses | (89,334) | (105,790)
Securities HTM, unrealized losses | (21,787) | (26,041)
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available-for-sale, less than 12 months, fair value | 9,907 | 9,181
Securities available-for-sale, less than 12 months, unrealized losses | (143) | (164)
Securities available-for-sale, 12 months or more, fair value | 97,798 | 101,407
Securities available-for-sale, 12 months or more, unrealized losses | (13,042) | (14,034)
Securities available-for-sale, fair value | 107,705 | 110,588
Securities available-for-sale, unrealized losses | (13,185) | (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 | 2,552 | 2,530
Securities available-for-sale, 12 months or more, unrealized losses | (102) | (156)
Securities available-for-sale, fair value | 2,552 | 2,530
Securities available-for-sale, unrealized losses | $ (102) | $ (156)

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