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SUMMARY OF INVESTMENTS - Fixed Maturities Unrealized Loss (Details)
$ in Thousands
Sep. 30, 2025
USD ($)
issue
Dec. 31, 2024
USD ($)
issue
Number of Issues    
Less than 12 months | issue 111 242
12 months or longer | issue 278 387
Fair Value    
Less than 12 months $ 276,124 $ 670,804
12 months or longer 591,296 744,741
Total 867,420 1,415,544
Gross Unrealized Loss    
Less than 12 months 1,399 11,097
12 months or longer 58,374 85,743
Total $ 59,773 $ 96,840
US Treasury and government agencies    
Number of Issues    
Less than 12 months | issue 1 5
12 months or longer | issue 24 28
Fair Value    
Less than 12 months $ 900 $ 16,006
12 months or longer 74,062 83,386
Total 74,962 99,392
Gross Unrealized Loss    
Less than 12 months 1 67
12 months or longer 6,251 9,188
Total $ 6,252 $ 9,255
States, municipalities and political subdivisions    
Number of Issues    
Less than 12 months | issue 30 67
12 months or longer | issue 56 72
Fair Value    
Less than 12 months $ 39,700 $ 92,003
12 months or longer 111,261 135,350
Total 150,961 227,353
Gross Unrealized Loss    
Less than 12 months 241 1,159
12 months or longer 1,673 3,925
Total $ 1,914 $ 5,084
Corporate    
Number of Issues    
Less than 12 months | issue 44 73
12 months or longer | issue 92 154
Fair Value    
Less than 12 months $ 125,943 $ 203,142
12 months or longer 248,875 370,211
Total 374,818 573,352
Gross Unrealized Loss    
Less than 12 months 580 4,474
12 months or longer 23,870 36,159
Total $ 24,450 $ 40,633
Residential mortgage-backed    
Number of Issues    
Less than 12 months | issue 29 79
12 months or longer | issue 103 131
Fair Value    
Less than 12 months $ 83,281 $ 318,810
12 months or longer 153,709 151,879
Total 236,990 470,689
Gross Unrealized Loss    
Less than 12 months 463 4,549
12 months or longer 26,150 36,335
Total $ 26,613 $ 40,884
Commercial mortgage-backed    
Number of Issues    
Less than 12 months | issue 1 4
12 months or longer | issue 0 0
Fair Value    
Less than 12 months $ 5,481 $ 8,198
12 months or longer 0 0
Total 5,481 8,198
Gross Unrealized Loss    
Less than 12 months 10 44
12 months or longer 0 0
Total $ 10 $ 44
Other asset-backed    
Number of Issues    
Less than 12 months | issue 6 14
12 months or longer | issue 3 2
Fair Value    
Less than 12 months $ 20,819 $ 32,645
12 months or longer 3,389 3,915
Total 24,208 36,560
Gross Unrealized Loss    
Less than 12 months 104 804
12 months or longer 430 136
Total $ 534 $ 940