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INVESTMENTS - Fixed Maturities Unrealized Loss (Details)
$ in Thousands
Dec. 31, 2025
USD ($)
issue
Dec. 31, 2024
USD ($)
issue
Number of Issues    
Less than 12 months | issue 149 242
12 months or longer | issue 267 387
Fair Value    
Less than 12 months $ 418,332 $ 670,804
12 months or longer 559,862 744,741
Total 978,194 1,415,544
Gross Unrealized Loss    
Less than 12 months 1,975 11,097
12 months or longer 55,748 85,743
Total $ 57,723 $ 96,840
US Treasury and government agencies    
Number of Issues    
Less than 12 months | issue 3 5
12 months or longer | issue 25 28
Fair Value    
Less than 12 months $ 1,743 $ 16,006
12 months or longer 72,773 83,386
Total 74,516 99,392
Gross Unrealized Loss    
Less than 12 months 3 67
12 months or longer 5,733 9,188
Total $ 5,736 $ 9,255
States, municipalities and political subdivisions    
Number of Issues    
Less than 12 months | issue 39 67
12 months or longer | issue 52 72
Fair Value    
Less than 12 months $ 60,660 $ 92,003
12 months or longer 104,732 135,350
Total 165,392 227,353
Gross Unrealized Loss    
Less than 12 months 478 1,159
12 months or longer 1,097 3,925
Total $ 1,575 $ 5,084
Corporate    
Number of Issues    
Less than 12 months | issue 52 73
12 months or longer | issue 83 154
Fair Value    
Less than 12 months $ 156,734 $ 203,142
12 months or longer 226,071 370,211
Total 382,805 573,352
Gross Unrealized Loss    
Less than 12 months 866 4,474
12 months or longer 23,058 36,159
Total $ 23,924 $ 40,633
Residential mortgage-backed    
Number of Issues    
Less than 12 months | issue 34 0
12 months or longer | issue 103 0
Fair Value    
Less than 12 months $ 121,159 $ 318,810
12 months or longer 148,711 151,879
Total 269,870 470,689
Gross Unrealized Loss    
Less than 12 months 398 4,549
12 months or longer 25,448 36,335
Total $ 25,846 $ 40,884
Commercial mortgage-backed    
Number of Issues    
Less than 12 months | issue 2 4
12 months or longer | issue 0 0
Fair Value    
Less than 12 months $ 7,986 $ 8,198
12 months or longer 0 0
Total 7,986 8,198
Gross Unrealized Loss    
Less than 12 months 7 44
12 months or longer 0 0
Total $ 7 $ 44
Other asset-backed    
Number of Issues    
Less than 12 months | issue 19 14
12 months or longer | issue 4 2
Fair Value    
Less than 12 months $ 70,050 $ 32,645
12 months or longer 7,575 3,915
Total 77,625 36,560
Gross Unrealized Loss    
Less than 12 months 223 804
12 months or longer 412 136
Total $ 635 $ 940