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Note 3 - Investment Securities - Securities With Unrealized Losses (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Securities available-for-sale, less than 12 months, fair value | $ 164,154 | $ 352,103
Securities available-for-sale, less than 12 months, unrealized losses | (4,078) | (18,700)
Securities available-for-sale, 12 months or more, fair value | 926,975 | 760,051
Securities available-for-sale, 12 months or more, unrealized losses | (130,501) | (135,009)
Securities available-for-sale, fair value | 1,091,129 | 1,112,154
Securities available-for-sale, unrealized losses | (134,579) | (153,709)
Securities HTM, less than 12 months, fair value | 2,011 | 431,833
Securities HTM, less than 12 months, unrealized losses | (13) | (41,384)
Securities HTM, 12 months or more, fair value | 431,889 | 0
Securities HTM, 12 months or more, unrealized losses | (34,838) | 0
Securities HTM, fair value | 433,900 | 431,833
Securities HTM, unrealized losses | (34,851) | (41,384)
US Treasury Securities and US Government Agencies Debt Securities [Member] |  |
Securities available-for-sale, less than 12 months, fair value | 0 | 3,025
Securities available-for-sale, less than 12 months, unrealized losses | 0 | (57)
Securities available-for-sale, 12 months or more, fair value | 116,288 | 111,966
Securities available-for-sale, 12 months or more, unrealized losses | (6,464) | (7,870)
Securities available-for-sale, fair value | 116,288 | 114,991
Securities available-for-sale, unrealized losses | (6,464) | (7,927)
Securities HTM, less than 12 months, fair value | 0 | 208,628
Securities HTM, less than 12 months, unrealized losses | 0 | (9,166)
Securities HTM, 12 months or more, fair value | 210,841 | 0
Securities HTM, 12 months or more, unrealized losses | (7,065) | 0
Securities HTM, fair value | 210,841 | 208,628
Securities HTM, unrealized losses | (7,065) | (9,166)
US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities available-for-sale, less than 12 months, fair value | 43,668 | 99,785
Securities available-for-sale, less than 12 months, unrealized losses | (157) | (3,553)
Securities available-for-sale, 12 months or more, fair value | 76,479 | 22,484
Securities available-for-sale, 12 months or more, unrealized losses | (5,039) | (2,884)
Securities available-for-sale, fair value | 120,147 | 122,269
Securities available-for-sale, unrealized losses | (5,196) | (6,437)
Securities HTM, less than 12 months, fair value | 1,602 | 24,948
Securities HTM, less than 12 months, unrealized losses | (4) | (2,559)
Securities HTM, 12 months or more, fair value | 23,743 | 0
Securities HTM, 12 months or more, unrealized losses | (1,880) | 0
Securities HTM, fair value | 25,345 | 24,948
Securities HTM, unrealized losses | (1,884) | (2,559)
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Securities available-for-sale, less than 12 months, fair value | 113,174 | 180,263
Securities available-for-sale, less than 12 months, unrealized losses | (3,879) | (11,114)
Securities available-for-sale, 12 months or more, fair value | 620,688 | 567,988
Securities available-for-sale, 12 months or more, unrealized losses | (104,545) | (110,471)
Securities available-for-sale, fair value | 733,862 | 748,251
Securities available-for-sale, unrealized losses | (108,424) | (121,585)
Securities HTM, less than 12 months, fair value | 409 | 198,257
Securities HTM, less than 12 months, unrealized losses | (9) | (29,659)
Securities HTM, 12 months or more, fair value | 197,305 | 0
Securities HTM, 12 months or more, unrealized losses | (25,893) | 0
Securities HTM, fair value | 197,714 | 198,257
Securities HTM, unrealized losses | (25,902) | (29,659)
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available-for-sale, less than 12 months, fair value | 7,312 | 64,165
Securities available-for-sale, less than 12 months, unrealized losses | (42) | (3,763)
Securities available-for-sale, 12 months or more, fair value | 107,916 | 56,864
Securities available-for-sale, 12 months or more, unrealized losses | (14,134) | (13,655)
Securities available-for-sale, fair value | 115,228 | 121,029
Securities available-for-sale, unrealized losses | (14,176) | (17,418)
Other Debt Obligations [Member] |  |
Securities available-for-sale, less than 12 months, fair value | 0 | 4,865
Securities available-for-sale, less than 12 months, unrealized losses | 0 | (213)
Securities available-for-sale, 12 months or more, fair value | 5,604 | 749
Securities available-for-sale, 12 months or more, unrealized losses | (319) | (129)
Securities available-for-sale, fair value | 5,604 | 5,614
Securities available-for-sale, unrealized losses | $ (319) | $ (342)

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