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Note 2 - Investment Securities - Securities With Unrealized Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Securities available-for-sale, less than 12 months, fair value | $ 52,893 | $ 352,103
Securities available-for-sale, less than 12 months, unrealized losses | (2,604) | (18,700)
Securities available-for-sale, 12 months or more, fair value | 951,150 | 760,051
Securities available-for-sale, 12 months or more, unrealized losses | (173,053) | (135,009)
Securities available-for-sale, fair value | 1,004,043 | 1,112,154
Securities available-for-sale, unrealized losses | (175,657) | (153,709)
Securities HTM, less than 12 months, fair value | 1,415 | 431,833
Securities HTM, less than 12 months, unrealized losses | (4) | (41,384)
Securities HTM, 12 months or more, fair value | 395,954 | 0
Securities HTM, 12 months or more, unrealized losses | (47,783) | 0
Securities HTM, fair value | 397,369 | 431,833
Securities HTM, unrealized losses | (47,787) | (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 | 118,009 | 111,966
Securities available-for-sale, 12 months or more, unrealized losses | (5,491) | (7,870)
Securities available-for-sale, fair value | 118,009 | 114,991
Securities available-for-sale, unrealized losses | (5,491) | (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 | 196,494 | 0
Securities HTM, 12 months or more, unrealized losses | (7,645) | 0
Securities HTM, fair value | 196,494 | 208,628
Securities HTM, unrealized losses | (7,645) | (9,166)
US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities available-for-sale, less than 12 months, fair value | 10,262 | 99,785
Securities available-for-sale, less than 12 months, unrealized losses | (42) | (3,553)
Securities available-for-sale, 12 months or more, fair value | 83,081 | 22,484
Securities available-for-sale, 12 months or more, unrealized losses | (6,771) | (2,884)
Securities available-for-sale, fair value | 93,343 | 122,269
Securities available-for-sale, unrealized losses | (6,813) | (6,437)
Securities HTM, less than 12 months, fair value | 1,415 | 24,948
Securities HTM, less than 12 months, unrealized losses | (4) | (2,559)
Securities HTM, 12 months or more, fair value | 22,009 | 0
Securities HTM, 12 months or more, unrealized losses | (3,532) | 0
Securities HTM, fair value | 23,424 | 24,948
Securities HTM, unrealized losses | (3,536) | (2,559)
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Securities available-for-sale, less than 12 months, fair value | 29,149 | 180,263
Securities available-for-sale, less than 12 months, unrealized losses | (1,633) | (11,114)
Securities available-for-sale, 12 months or more, fair value | 643,517 | 567,988
Securities available-for-sale, 12 months or more, unrealized losses | (139,925) | (110,471)
Securities available-for-sale, fair value | 672,666 | 748,251
Securities available-for-sale, unrealized losses | (141,558) | (121,585)
Securities HTM, less than 12 months, fair value | 0 | 198,257
Securities HTM, less than 12 months, unrealized losses | 0 | (29,659)
Securities HTM, 12 months or more, fair value | 177,451 | 0
Securities HTM, 12 months or more, unrealized losses | (36,606) | 0
Securities HTM, fair value | 177,451 | 198,257
Securities HTM, unrealized losses | (36,606) | (29,659)
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available-for-sale, less than 12 months, fair value | 13,482 | 64,165
Securities available-for-sale, less than 12 months, unrealized losses | (929) | (3,763)
Securities available-for-sale, 12 months or more, fair value | 103,094 | 56,864
Securities available-for-sale, 12 months or more, unrealized losses | (20,459) | (13,655)
Securities available-for-sale, fair value | 116,576 | 121,029
Securities available-for-sale, unrealized losses | (21,388) | (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 | 3,449 | 749
Securities available-for-sale, 12 months or more, unrealized losses | (407) | (129)
Securities available-for-sale, fair value | 3,449 | 5,614
Securities available-for-sale, unrealized losses | $ (407) | $ (342)

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