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Note 4 - Investment Securities - Securities With Unrealized Losses (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Securities available-for-sale, less than 12 months, fair value | $ 22,672 | $ 352,103
Securities available-for-sale, less than 12 months, unrealized losses | (159) | (18,700)
Securities available-for-sale, 12 months or more, fair value | 969,852 | 760,051
Securities available-for-sale, 12 months or more, unrealized losses | (123,060) | (135,009)
Securities available-for-sale, fair value | 992,524 | 1,112,154
Securities available-for-sale, unrealized losses | (123,219) | (153,709)
Securities HTM, less than 12 months, fair value | 455 | 431,833
Securities HTM, less than 12 months, unrealized losses | (1) | (41,384)
Securities HTM, 12 months or more, fair value | 407,798 | 0
Securities HTM, 12 months or more, unrealized losses | (31,318) | 0
Securities HTM, fair value | 408,253 | 431,833
Securities HTM, unrealized losses | (31,319) | (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 | 116,269 | 111,966
Securities available-for-sale, 12 months or more, unrealized losses | (3,662) | (7,870)
Securities available-for-sale, fair value | 116,269 | 114,991
Securities available-for-sale, unrealized losses | (3,662) | (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 | 198,327 | 0
Securities HTM, 12 months or more, unrealized losses | (4,932) | 0
Securities HTM, fair value | 198,327 | 208,628
Securities HTM, unrealized losses | (4,932) | (9,166)
US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities available-for-sale, less than 12 months, fair value | 0 | 99,785
Securities available-for-sale, less than 12 months, unrealized losses | 0 | (3,553)
Securities available-for-sale, 12 months or more, fair value | 83,675 | 22,484
Securities available-for-sale, 12 months or more, unrealized losses | (4,987) | (2,884)
Securities available-for-sale, fair value | 83,675 | 122,269
Securities available-for-sale, unrealized losses | (4,987) | (6,437)
Securities HTM, less than 12 months, fair value | 455 | 24,948
Securities HTM, less than 12 months, unrealized losses | (1) | (2,559)
Securities HTM, 12 months or more, fair value | 23,967 | 0
Securities HTM, 12 months or more, unrealized losses | (2,456) | 0
Securities HTM, fair value | 24,422 | 24,948
Securities HTM, unrealized losses | (2,457) | (2,559)
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Securities available-for-sale, less than 12 months, fair value | 16,346 | 180,263
Securities available-for-sale, less than 12 months, unrealized losses | (95) | (11,114)
Securities available-for-sale, 12 months or more, fair value | 661,195 | 567,988
Securities available-for-sale, 12 months or more, unrealized losses | (101,094) | (110,471)
Securities available-for-sale, fair value | 677,541 | 748,251
Securities available-for-sale, unrealized losses | (101,189) | (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 | 185,504 | 0
Securities HTM, 12 months or more, unrealized losses | (23,930) | 0
Securities HTM, fair value | 185,504 | 198,257
Securities HTM, unrealized losses | (23,930) | (29,659)
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available-for-sale, less than 12 months, fair value | 6,326 | 64,165
Securities available-for-sale, less than 12 months, unrealized losses | (64) | (3,763)
Securities available-for-sale, 12 months or more, fair value | 105,179 | 56,864
Securities available-for-sale, 12 months or more, unrealized losses | (13,030) | (13,655)
Securities available-for-sale, fair value | 111,505 | 121,029
Securities available-for-sale, unrealized losses | (13,094) | (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 | 3,534 | 749
Securities available-for-sale, 12 months or more, unrealized losses | (287) | (129)
Securities available-for-sale, fair value | 3,534 | 5,614
Securities available-for-sale, unrealized losses | $ (287) | $ (342)

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