v3.26.1
Investments - Length Of Time, Gross Unrealized Losses and Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Marketable Securities    
Estimated Fair Value, Less than 12 Months $ 545,183 $ 298,906
Estimated Fair Value, 12 Months or More 404,097 467,118
Estimated Fair Value, Total 949,280 766,024
Unrealized Losses, Less than 12 Months 16,625 6,039
Unrealized Losses, 12 Months or More 39,064 37,748
Unrealized Losses, Total 55,689 43,787
Subtotal, fixed maturity securities    
Fixed Maturity Securities    
Estimated Fair Value, Less than 12 Months 470,763 229,982
Estimated Fair Value, 12 Months or More 399,307 459,151
Estimated Fair Value, Total 870,070 689,133
Unrealized Losses, Less than 12 Months 5,375 877
Unrealized Losses, 12 Months or More 37,368 34,945
Unrealized Losses, Total 42,743 35,822
U.S. Treasury securities    
Fixed Maturity Securities    
Estimated Fair Value, Less than 12 Months 2,078  
Estimated Fair Value, 12 Months or More 1,487 1,474
Estimated Fair Value, Total 3,565 1,474
Unrealized Losses, Less than 12 Months 31  
Unrealized Losses, 12 Months or More 15 28
Unrealized Losses, Total 46 28
Obligations of states and political subdivisions    
Fixed Maturity Securities    
Estimated Fair Value, Less than 12 Months 10,146 1,199
Estimated Fair Value, 12 Months or More 10,603 10,684
Estimated Fair Value, Total 20,749 11,883
Unrealized Losses, Less than 12 Months 104 6
Unrealized Losses, 12 Months or More 1,716 1,645
Unrealized Losses, Total 1,820 1,651
Residential mortgage-backed securities    
Fixed Maturity Securities    
Estimated Fair Value, Less than 12 Months 66,891 26,318
Estimated Fair Value, 12 Months or More 140,933 156,857
Estimated Fair Value, Total 207,824 183,175
Unrealized Losses, Less than 12 Months 769 153
Unrealized Losses, 12 Months or More 16,853 15,229
Unrealized Losses, Total 17,622 15,382
Commercial mortgage-backed securities    
Fixed Maturity Securities    
Estimated Fair Value, Less than 12 Months 29,577 15,491
Estimated Fair Value, 12 Months or More 94,468 103,960
Estimated Fair Value, Total 124,045 119,451
Unrealized Losses, Less than 12 Months 467 108
Unrealized Losses, 12 Months or More 6,605 6,331
Unrealized Losses, Total 7,072 6,439
Other asset-backed securities    
Fixed Maturity Securities    
Estimated Fair Value, Less than 12 Months 89,238 95,322
Estimated Fair Value, 12 Months or More 6,350 10,113
Estimated Fair Value, Total 95,588 105,435
Unrealized Losses, Less than 12 Months 296 146
Unrealized Losses, 12 Months or More 1,022 1,050
Unrealized Losses, Total 1,318 1,196
Corporate and other securities    
Fixed Maturity Securities    
Estimated Fair Value, Less than 12 Months 272,833 91,652
Estimated Fair Value, 12 Months or More 145,466 176,063
Estimated Fair Value, Total 418,299 267,715
Unrealized Losses, Less than 12 Months 3,708 464
Unrealized Losses, 12 Months or More 11,157 10,662
Unrealized Losses, Total 14,865 11,126
Equity securities    
Equity Securities    
Estimated Fair Value, Less than 12 Months 74,420 68,924
Estimated Fair Value, 12 Months or More 4,790 7,967
Estimated Fair Value, Total 79,210 76,891
Unrealized Losses, Less than 12 Months 11,250 5,162
Unrealized Losses, 12 Months or More 1,696 2,803
Unrealized Losses, Total $ 12,946 $ 7,965