v3.25.2
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, 2025
Dec. 31, 2024
Fair value    
Less than 12 months $ 405,768 $ 909,943
12 months and greater 1,480,888 1,633,651
Total Fair Value 1,886,656 2,543,594
Amortized Cost    
Amortized cost, less than 12 months 414,375 932,763
12 months and greater 1,649,096 1,835,442
Total Cost or Amortized Cost 2,063,471 2,768,205
Unrealized Loss    
Less than 12 months (8,607) (22,820)
12 months and greater (168,208) (201,791)
Total Unrealized Loss (176,815) (224,611)
U.S. government    
Fair value    
Less than 12 months 60,991 303,226
12 months and greater 120,340 157,418
Total Fair Value 181,331 460,644
Amortized Cost    
Amortized cost, less than 12 months 61,484 309,836
12 months and greater 122,476 161,090
Total Cost or Amortized Cost 183,960 470,926
Unrealized Loss    
Less than 12 months (493) (6,610)
12 months and greater (2,136) (3,672)
Total Unrealized Loss (2,629) (10,282)
U.S. Agency    
Fair value    
Less than 12 months 14,696 24,024
12 months and greater 18,686 18,330
Total Fair Value 33,382 42,354
Amortized Cost    
Amortized cost, less than 12 months 15,031 24,910
12 months and greater 19,284 19,288
Total Cost or Amortized Cost 34,315 44,198
Unrealized Loss    
Less than 12 months (335) (886)
12 months and greater (598) (958)
Total Unrealized Loss (933) (1,844)
Non-U.S. government & agency    
Fair value    
Less than 12 months 2,392 4,075
12 months and greater 4,028 3,796
Total Fair Value 6,420 7,871
Amortized Cost    
Amortized cost, less than 12 months 2,395 4,158
12 months and greater 4,801 4,801
Total Cost or Amortized Cost 7,196 8,959
Unrealized Loss    
Less than 12 months (3) (83)
12 months and greater (773) (1,005)
Total Unrealized Loss (776) (1,088)
Agency MBS    
Fair value    
Less than 12 months 68,809 108,772
12 months and greater 227,415 233,625
Total Fair Value 296,224 342,397
Amortized Cost    
Amortized cost, less than 12 months 70,136 111,674
12 months and greater 261,657 273,972
Total Cost or Amortized Cost 331,793 385,646
Unrealized Loss    
Less than 12 months (1,327) (2,902)
12 months and greater (34,242) (40,347)
Total Unrealized Loss (35,569) (43,249)
ABS/CMBS/MBS    
Fair value    
Less than 12 months 17,352 43,027
12 months and greater 157,095 164,433
Total Fair Value 174,447 207,460
Amortized Cost    
Amortized cost, less than 12 months 17,402 43,395
12 months and greater 175,726 186,990
Total Cost or Amortized Cost 193,128 230,385
Unrealized Loss    
Less than 12 months (50) (368)
12 months and greater (18,631) (22,557)
Total Unrealized Loss (18,681) (22,925)
Corporate    
Fair value    
Less than 12 months 215,519 378,305
12 months and greater 593,018 700,574
Total Fair Value 808,537 1,078,879
Amortized Cost    
Amortized cost, less than 12 months 221,224 389,299
12 months and greater 623,633 745,283
Total Cost or Amortized Cost 844,857 1,134,582
Unrealized Loss    
Less than 12 months (5,705) (10,994)
12 months and greater (30,615) (44,709)
Total Unrealized Loss (36,320) (55,703)
Municipal    
Fair value    
Less than 12 months 26,009 48,514
12 months and greater 360,306 355,475
Total Fair Value 386,315 403,989
Amortized Cost    
Amortized cost, less than 12 months 26,703 49,491
12 months and greater 441,519 444,018
Total Cost or Amortized Cost 468,222 493,509
Unrealized Loss    
Less than 12 months (694) (977)
12 months and greater (81,213) (88,543)
Total Unrealized Loss $ (81,907) $ (89,520)