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Investments in Securities and Fair Value Investments in Securities (Schedule of Unrealized Losses on Investments) (Details) $ in Thousands | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
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Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 52 | 51
Government obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 1,488 | $ 4,322
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (2) | (7)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 1,488 | 4,322
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (2) | (7)
General obligations of U.S. states, territories and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 5,925 | 3,221
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (23) | (36)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 101 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1) | 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 6,026 | 3,221
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (24) | (36)
Special revenue issuer obligations of U.S. states, territories and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 7,124 | 12,568
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (16) | (216)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 3,085 | 1,100
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (50) | (3)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 10,209 | 13,668
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (66) | (219)
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 6,052 | 6,498
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (29) | (68)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 296 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (4) | 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 6,348 | 6,498
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (33) | (68)
Total fixed maturity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 20,589 | 26,609
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (70) | (327)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 3,482 | 1,100
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (55) | (3)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 24,071 | 27,709
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (125) | $ (330)

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