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Investments - Summary of Fair Value, Including Financial Guarantee, and Weighted-Average Underlying Rating, Excluding Financial Guarantee, of Insured Securities (Phantom) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Investment [Line Items]        
Investment expense $ (87) $ (102) $ (84) $ (193)
Investment income 2,609 3,763 5,424 7,403
Fixed Income Investments [Member]        
Investment [Line Items]        
Gross Investment Income, Operating 1,470 1,263 2,870 2,434
Short-Term [Member]        
Investment [Line Items]        
Gross Investment Income, Operating $ 1,191 $ 2,988 $ 2,648 $ 5,577