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Summary of Investments - Fixed Maturities Unrealized Loss (Details)
$ in Thousands
Mar. 31, 2025
USD ($)
issue
Dec. 31, 2024
USD ($)
issue
Number of Issues    
Less than 12 months | issue 171 242
12 months or longer | issue 355 387
Fair Value    
Less than 12 months $ 384,664 $ 670,804
12 months or longer 698,017 744,741
Total 1,082,681 1,415,544
Gross Unrealized Loss    
Less than 12 months 4,796 11,097
12 months or longer 71,650 85,743
Total $ 76,446 $ 96,840
US Treasury and government agencies    
Number of Issues    
Less than 12 months | issue 0 5
12 months or longer | issue 26 28
Fair Value    
Less than 12 months $ 0 $ 16,006
12 months or longer 79,450 83,386
Total 79,450 99,392
Gross Unrealized Loss    
Less than 12 months 0 67
12 months or longer 7,208 9,188
Total $ 7,208 $ 9,255
States, municipalities and political subdivisions    
Number of Issues    
Less than 12 months | issue 48 67
12 months or longer | issue 73 72
Fair Value    
Less than 12 months $ 69,217 $ 92,003
12 months or longer 138,291 135,350
Total 207,508 227,353
Gross Unrealized Loss    
Less than 12 months 652 1,159
12 months or longer 4,087 3,925
Total $ 4,739 $ 5,084
Corporate    
Number of Issues    
Less than 12 months | issue 57 73
12 months or longer | issue 135 154
Fair Value    
Less than 12 months $ 142,880 $ 203,142
12 months or longer 330,985 370,211
Total 473,865 573,352
Gross Unrealized Loss    
Less than 12 months 2,037 4,474
12 months or longer 30,234 36,159
Total $ 32,271 $ 40,633
Residential mortgage-backed    
Number of Issues    
Less than 12 months | issue 43 79
12 months or longer | issue 118 131
Fair Value    
Less than 12 months $ 101,485 $ 318,810
12 months or longer 145,546 151,879
Total 247,031 470,689
Gross Unrealized Loss    
Less than 12 months 1,589 4,549
12 months or longer 29,638 36,335
Total $ 31,227 $ 40,884
Commercial mortgage-backed    
Number of Issues    
Less than 12 months | issue 6 4
12 months or longer | issue 0 0
Fair Value    
Less than 12 months $ 20,452 $ 8,198
12 months or longer 0 0
Total 20,452 8,198
Gross Unrealized Loss    
Less than 12 months 272 44
12 months or longer 0 0
Total $ 272 $ 44
Other asset-backed    
Number of Issues    
Less than 12 months | issue 17 14
12 months or longer | issue 3 2
Fair Value    
Less than 12 months $ 50,630 $ 32,645
12 months or longer 3,745 3,915
Total 54,375 36,560
Gross Unrealized Loss    
Less than 12 months 246 804
12 months or longer 483 136
Total $ 729 $ 940