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Note 7 - Investment Securities - Temporarily Impaired Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Temporarily impaired securities, less than 12 months, fair value | $ 500,758 | $ 137,572
Temporarily impaired securities, less than 12 months, unrealized losses | 6,995 | 423
Temporarily impaired securities, 12 months or longer, fair value | 29,301 | 48,295
Temporarily impaired securities, 12 months or longer, fair value | 1,127 | 1,036
Temporarily impaired securities, total fair value | 530,059 | 185,867
Temporarily impaired securities, total unrealized losses | 8,122 | 1,459
US Government Corporations and Agencies Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 0 | 26,390
Temporarily impaired securities, less than 12 months, unrealized losses | 0 | 102
Temporarily impaired securities, 12 months or longer, fair value | 2,403 | 40,009
Temporarily impaired securities, 12 months or longer, fair value | 135 | 444
Temporarily impaired securities, total fair value | 2,403 | 66,399
Temporarily impaired securities, total unrealized losses | 135 | 546
US Treasury Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value |  | 40,952
Temporarily impaired securities, less than 12 months, unrealized losses |  | 6
Temporarily impaired securities, 12 months or longer, fair value |  | 0
Temporarily impaired securities, 12 months or longer, fair value |  | 0
Temporarily impaired securities, total fair value |  | 40,952
Temporarily impaired securities, total unrealized losses |  | 6
Collateralized Mortgage Backed Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 399,470 | 1,694
Temporarily impaired securities, less than 12 months, unrealized losses | 5,632 | 23
Temporarily impaired securities, 12 months or longer, fair value | 7,038 | 8,093
Temporarily impaired securities, 12 months or longer, fair value | 696 | 583
Temporarily impaired securities, total fair value | 406,508 | 9,787
Temporarily impaired securities, total unrealized losses | 6,328 | 606
Collateralized Mortgage Obligations [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 9,418 | 10,131
Temporarily impaired securities, less than 12 months, unrealized losses | 219 | 25
Temporarily impaired securities, 12 months or longer, fair value | 144 | 193
Temporarily impaired securities, 12 months or longer, fair value | 12 | 9
Temporarily impaired securities, total fair value | 9,562 | 10,324
Temporarily impaired securities, total unrealized losses | 231 | 34
Corporate Debt Securities [Member] |  |
Temporarily impaired securities, less than 12 months, fair value | 91,870 | 58,405
Temporarily impaired securities, less than 12 months, unrealized losses | 1,144 | 267
Temporarily impaired securities, 12 months or longer, fair value | 19,716 | 0
Temporarily impaired securities, 12 months or longer, fair value | 284 | 0
Temporarily impaired securities, total fair value | 111,586 | 58,405
Temporarily impaired securities, total unrealized losses | $ 1,428 | $ 267

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