v3.26.1
Investments - Summary of Contractual Maturities of Fixed Maturity Securities Available-For-Sale (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Amortized cost    
Due one year or less $ 345,208  
Due after one year through five years 1,134,256  
Due after five years through ten years 2,589,473  
Due after ten years 593,243  
Subtotal 4,662,180  
Amortized cost 6,258,735 $ 6,081,997
Fair value    
Due one year or less 343,140  
Due after one year through five years 1,100,322  
Due after five years through ten years 2,551,470  
Due after ten years 583,376  
Subtotal 4,578,308  
Fair value 6,161,975 6,050,542
Residential mortgage-backed    
Amortized cost    
Residential mortgage-backed and other asset-backed, amortization 356,566  
Amortized cost 356,566 342,915
Fair value    
Residential mortgage-backed and other asset-backed, fair value 358,002  
Fair value 358,002 349,333
Commercial mortgage-backed    
Amortized cost    
Residential mortgage-backed and other asset-backed, amortization 225,858  
Amortized cost 225,858 128,692
Fair value    
Residential mortgage-backed and other asset-backed, fair value 223,468  
Fair value 223,468 129,562
Other asset-backed    
Amortized cost    
Residential mortgage-backed and other asset-backed, amortization 1,014,131  
Amortized cost 1,014,131 1,063,044
Fair value    
Residential mortgage-backed and other asset-backed, fair value 1,002,197  
Fair value $ 1,002,197 $ 1,056,123