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Investments in Securities and Fair Value Investments in Securities (Schedule of Unrealized Losses on Investments) (Details)
$ in Thousands
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions 60 52
Government obligations    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 0 $ 1,488
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 (2)
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 0 1,488
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 0 (2)
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 1,960 5,925
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (2) (23)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 2,780 101
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (29) (1)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 4,740 6,026
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (31) (24)
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 5,477 7,124
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (45) (16)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 2,828 3,085
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (28) (50)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 8,305 10,209
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (73) (66)
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 22,641 6,052
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (131) (29)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 149 296
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (1) (4)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 22,790 6,348
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (132) (33)
Total fixed maturity securities    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 30,078 20,589
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (178) (70)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 5,757 3,482
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (58) (55)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 35,835 24,071
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (236) $ (125)