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Note 6 - Investments - Gross Unrealized Losses and Fair Value of Available for Sale Securities (Details) $ in Thousands | Sep. 30, 2021 USD ($) security | Dec. 31, 2020 USD ($) security
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Continuous Loss Position, Total |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | security | 411 | 194
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 1,644,089 | $ 679,631
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (23,471) | $ (12,101)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security | 65 | 36
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 184,506 | $ 158,852
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ (10,551) | $ (2,056)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security | 476 | 230
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 1,828,595 | $ 838,483
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (34,022) | $ (14,157)
U.S. government and agencies securities |  |
Continuous Loss Position, Total |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | security | 14 | 4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 175,339 | $ 90,591
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (1,207) | $ (3,611)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security | 2 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 9,477 | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ (677) | $ 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security | 16 | 4
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 184,816 | $ 90,591
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (1,884) | $ (3,611)
State and municipal obligations |  |
Continuous Loss Position, Total |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | security | 15 | 4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 20,223 | $ 9,626
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (254) | $ (100)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security | 1 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 2,831 | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ (103) | $ 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security | 16 | 4
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 23,054 | $ 9,626
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (357) | $ (100)
Corporate bonds and notes |  |
Continuous Loss Position, Total |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | security | 175 | 60
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 719,649 | $ 174,848
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (16,424) | $ (3,758)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security | 32 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 90,207 | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ (8,557) | $ 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security | 207 | 60
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 809,856 | $ 174,848
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (24,981) | $ (3,758)
RMBS |  |
Continuous Loss Position, Total |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | security | 36 | 5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 258,829 | $ 42,003
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (3,291) | $ (305)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security | 2 | 2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 758 | $ 915
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ (9) | $ (9)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security | 38 | 7
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 259,587 | $ 42,918
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (3,300) | $ (314)
CMBS |  |
Continuous Loss Position, Total |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | security | 59 | 43
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 118,990 | $ 118,345
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (1,555) | $ (3,035)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security | 12 | 6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 25,224 | $ 8,312
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ (926) | $ (266)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security | 71 | 49
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 144,214 | $ 126,657
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (2,481) | $ (3,301)
CLO |  |
Continuous Loss Position, Total |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | security | 68 | 52
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 251,734 | $ 173,459
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (287) | $ (970)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security | 14 | 25
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 55,150 | $ 137,506
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ (256) | $ (1,671)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security | 82 | 77
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 306,884 | $ 310,965
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (543) | $ (2,641)
Other ABS |  |
Continuous Loss Position, Total |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | security | 44 | 26
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 99,325 | $ 70,759
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (453) | $ (322)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security | 2 | 3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 859 | $ 12,119
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ (23) | $ (110)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security | 46 | 29
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 100,184 | $ 82,878
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (476) | $ (432)

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