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Investments - Schedule of Contractual Maturity of Fixed Maturity Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Amortized Cost    
Due in one year or less $ 133,335 $ 254,656
Due after one year through five years 330,832 122,274
Due after five years through ten years 79,882 27,145
Due after ten years 29,942 16,369
Fixed maturity securities in Amortized Cost 573,991 420,444
Total 892,953 569,013
Fair Value    
Due in one year or less 133,341 254,443
Due after one year through five years 329,839 118,585
Due after five years through ten years 80,370 25,265
Due after ten years 28,377 14,160
Fixed maturity securities in Fair Value 571,927 412,453
Total fixed maturity securities 891,252 554,624
Commercial mortgage-backed securities    
Amortized Cost    
Mortgage backed securities in Amortized Cost 61,453 26,573
Total 61,453 26,573
Fair Value    
Mortgage-backed securities in Fair Value 61,855 25,436
Total fixed maturity securities 61,855 25,436
Residential mortgage-backed securities    
Amortized Cost    
Mortgage backed securities in Amortized Cost 174,766 79,032
Total 174,766 79,032
Fair Value    
Mortgage-backed securities in Fair Value 174,470 74,702
Total fixed maturity securities 174,470 74,702
Asset-backed securities    
Amortized Cost    
Mortgage backed securities in Amortized Cost 82,743 42,964
Total 82,743 42,964
Fair Value    
Mortgage-backed securities in Fair Value 83,000 42,033
Total fixed maturity securities $ 83,000 $ 42,033