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Note 3 - Investment Securities - Securities With Unrealized Losses (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Securities available-for-sale, less than 12 months, fair value | $ 800,613 | $ 808,870
Securities available-for-sale, less than 12 months, unrealized losses | (72,355) | (12,206)
Securities available-for-sale, 12 months or more, fair value | 282,493 | 103,568
Securities available-for-sale, 12 months or more, unrealized losses | (43,132) | (3,156)
Securities available-for-sale, fair value | 1,083,106 | 912,438
Securities available-for-sale, unrealized losses | (115,487) | (15,362)
Securities HTM, less than 12 months, fair value | 458,762 |
Securities HTM, less than 12 months, unrealized losses | (24,626) |
Securities HTM, 12 months or more, fair value | 0 |
Securities HTM, 12 months or more, unrealized losses | 0 |
Securities HTM, fair value | 458,762 |
Securities HTM, unrealized losses | (24,626) |
US Treasury Securities and US Government Agencies Debt Securities [Member] |  |
Securities available-for-sale, less than 12 months, fair value | 115,533 | 122,501
Securities available-for-sale, less than 12 months, unrealized losses | (6,314) | (1,252)
Securities available-for-sale, 12 months or more, fair value | 0 | 0
Securities available-for-sale, 12 months or more, unrealized losses | 0 | 0
Securities available-for-sale, fair value | 115,533 | 122,501
Securities available-for-sale, unrealized losses | (6,314) | (1,252)
Securities HTM, less than 12 months, fair value | 215,015 |
Securities HTM, less than 12 months, unrealized losses | (4,559) |
Securities HTM, 12 months or more, fair value | 0 |
Securities HTM, 12 months or more, unrealized losses | 0 |
Securities HTM, fair value | 215,015 |
Securities HTM, unrealized losses | (4,559) |
US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities available-for-sale, less than 12 months, fair value | 80,629 | 23,789
Securities available-for-sale, less than 12 months, unrealized losses | (3,574) | (223)
Securities available-for-sale, 12 months or more, fair value | 8,102 | 447
Securities available-for-sale, 12 months or more, unrealized losses | (302) | (13)
Securities available-for-sale, fair value | 88,731 | 24,236
Securities available-for-sale, unrealized losses | (3,876) | (236)
Securities HTM, less than 12 months, fair value | 25,213 |
Securities HTM, less than 12 months, unrealized losses | (665) |
Securities HTM, 12 months or more, fair value | 0 |
Securities HTM, 12 months or more, unrealized losses | 0 |
Securities HTM, fair value | 25,213 |
Securities HTM, unrealized losses | (665) |
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Securities available-for-sale, less than 12 months, fair value | 472,323 | 615,130
Securities available-for-sale, less than 12 months, unrealized losses | (49,162) | (10,027)
Securities available-for-sale, 12 months or more, fair value | 273,568 | 102,637
Securities available-for-sale, 12 months or more, unrealized losses | (42,647) | (3,127)
Securities available-for-sale, fair value | 745,891 | 717,767
Securities available-for-sale, unrealized losses | (91,809) | (13,154)
Securities HTM, less than 12 months, fair value | 218,534 |
Securities HTM, less than 12 months, unrealized losses | (19,402) |
Securities HTM, 12 months or more, fair value | 0 |
Securities HTM, 12 months or more, unrealized losses | 0 |
Securities HTM, fair value | 218,534 |
Securities HTM, unrealized losses | (19,402) |
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available-for-sale, less than 12 months, fair value | 126,114 | 46,493
Securities available-for-sale, less than 12 months, unrealized losses | (13,098) | (686)
Securities available-for-sale, 12 months or more, fair value | 823 | 484
Securities available-for-sale, 12 months or more, unrealized losses | (183) | (16)
Securities available-for-sale, fair value | 126,937 | 46,977
Securities available-for-sale, unrealized losses | (13,281) | (702)
Other Debt Obligations [Member] |  |
Securities available-for-sale, less than 12 months, fair value | 6,014 | 957
Securities available-for-sale, less than 12 months, unrealized losses | (207) | (18)
Securities available-for-sale, 12 months or more, fair value | 0 | 0
Securities available-for-sale, 12 months or more, unrealized losses | 0 | 0
Securities available-for-sale, fair value | 6,014 | 957
Securities available-for-sale, unrealized losses | $ (207) | $ (18)

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