v3.26.1
Investments - Securities in an Unrealized Loss Position Segregated by Type and Length of Time in an Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Fair value    
Less than 12 months $ 1,445,088 $ 303,929
12 months and greater 1,115,247 1,356,745
Total Fair Value 2,560,335 1,660,674
Amortized Cost    
Amortized cost, less than 12 months 1,461,107 306,596
12 months and greater 1,255,379 1,494,513
Total Amortized Cost 2,716,486 1,801,109
Unrealized Loss    
Less than 12 months (16,019) (2,667)
12 months and greater (140,132) (137,768)
Total Unrealized Loss (156,151) (140,435)
U.S. government    
Fair value    
Less than 12 months 116,625 8,610
12 months and greater 45,281 80,088
Total Fair Value 161,906 88,698
Amortized Cost    
Amortized cost, less than 12 months 117,338 8,620
12 months and greater 46,132 80,997
Total Amortized Cost 163,470 89,617
Unrealized Loss    
Less than 12 months (713) (10)
12 months and greater (851) (909)
Total Unrealized Loss (1,564) (919)
U.S. Agency    
Fair value    
Less than 12 months 7,723  
12 months and greater 7,927 19,797
Total Fair Value 15,650 19,797
Amortized Cost    
Amortized cost, less than 12 months 7,924  
12 months and greater 8,008 19,926
Total Amortized Cost 15,932 19,926
Unrealized Loss    
Less than 12 months (201)  
12 months and greater (81) (129)
Total Unrealized Loss (282) (129)
Non-U.S. government    
Fair value    
Less than 12 months 4,411  
12 months and greater 4,268 4,244
Total Fair Value 8,679 4,244
Amortized Cost    
Amortized cost, less than 12 months 4,447  
12 months and greater 4,802 4,802
Total Amortized Cost 9,249 4,802
Unrealized Loss    
Less than 12 months (36)  
12 months and greater (534) (558)
Total Unrealized Loss (570) (558)
Agency MBS    
Fair value    
Less than 12 months 291,449 34,783
12 months and greater 190,635 239,581
Total Fair Value 482,084 274,364
Amortized Cost    
Amortized cost, less than 12 months 295,278 34,917
12 months and greater 219,811 267,839
Total Amortized Cost 515,089 302,756
Unrealized Loss    
Less than 12 months (3,829) (134)
12 months and greater (29,176) (28,258)
Total Unrealized Loss (33,005) (28,392)
ABS/CMBS/MBS    
Fair value    
Less than 12 months 398,451 110,600
12 months and greater 133,375 142,903
Total Fair Value 531,826 253,503
Amortized Cost    
Amortized cost, less than 12 months 401,832 110,826
12 months and greater 148,897 157,989
Total Amortized Cost 550,729 268,815
Unrealized Loss    
Less than 12 months (3,381) (226)
12 months and greater (15,522) (15,086)
Total Unrealized Loss (18,903) (15,312)
Corporate    
Fair value    
Less than 12 months 604,882 146,177
12 months and greater 436,738 545,897
Total Fair Value 1,041,620 692,074
Amortized Cost    
Amortized cost, less than 12 months 612,223 148,444
12 months and greater 464,718 571,560
Total Amortized Cost 1,076,941 720,004
Unrealized Loss    
Less than 12 months (7,341) (2,267)
12 months and greater (27,980) (25,663)
Total Unrealized Loss (35,321) (27,930)
Municipal    
Fair value    
Less than 12 months 21,547 3,759
12 months and greater 297,023 324,235
Total Fair Value 318,570 327,994
Amortized Cost    
Amortized cost, less than 12 months 22,065 3,789
12 months and greater 363,011 391,400
Total Amortized Cost 385,076 395,189
Unrealized Loss    
Less than 12 months (518) (30)
12 months and greater (65,988) (67,165)
Total Unrealized Loss $ (66,506) $ (67,195)