v3.26.1
Investments - Fixed-maturity Securities Classified by Contractual Maturity Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Available-for-sale Securities, Debt Maturities [Abstract]    
Total available-for-sale fixed-maturity securities $ 3,444,026 $ 3,265,246
Fixed Maturities    
Available-for-sale Securities, Debt Maturities [Abstract]    
Due in one year or less, amortized cost 266,880  
Due after one year through five years, amortized cost 892,610  
Due after five years through 10 years, amortized cost 690,404  
Due after 10 years, amortized cost 675,574  
Total fixed-maturity securities with single maturity dates, amortized cost 2,525,468  
Mortgage and asset-backed securities, amortized cost 1,072,238  
Available-for-sale debt securities, amortized cost basis 3,597,706 $ 3,378,618
Due in one year or less, fair value 266,281  
Due after one year through five years, fair value 871,966  
Due after five years through 10 years, fair value 664,598  
Due after 10 years, fair value 628,042  
Total fixed-maturity securities with single maturity dates, fair value 2,430,887  
Mortgage and asset-backed securities, fair value 1,013,139  
Total available-for-sale fixed-maturity securities $ 3,444,026