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Investments - Securities in an Unrealized Loss Position Segregated by Type and Length of Time in an Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Fair value    
Less than 12 months $ 382,062 $ 909,943
12 months and greater 1,534,269 1,633,651
Total Fair Value 1,916,331 2,543,594
Amortized Cost    
Amortized cost, less than 12 months 384,386 932,763
12 months and greater 1,682,313 1,835,442
Total Cost or Amortized Cost 2,066,699 2,768,205
Unrealized Loss    
Less than 12 months (2,324) (22,820)
12 months and greater (148,044) (201,791)
Total Unrealized Loss (150,368) (224,611)
U.S. government    
Fair value    
Less than 12 months 11,055 303,226
12 months and greater 105,375 157,418
Total Fair Value 116,430 460,644
Amortized Cost    
Amortized cost, less than 12 months 11,078 309,836
12 months and greater 106,675 161,090
Total Cost or Amortized Cost 117,753 470,926
Unrealized Loss    
Less than 12 months (23) (6,610)
12 months and greater (1,300) (3,672)
Total Unrealized Loss (1,323) (10,282)
U.S. Agency    
Fair value    
Less than 12 months   24,024
12 months and greater 30,621 18,330
Total Fair Value 30,621 42,354
Amortized Cost    
Amortized cost, less than 12 months   24,910
12 months and greater 31,256 19,288
Total Cost or Amortized Cost 31,256 44,198
Unrealized Loss    
Less than 12 months   (886)
12 months and greater (635) (958)
Total Unrealized Loss (635) (1,844)
Non-U.S. government & agency    
Fair value    
Less than 12 months   4,075
12 months and greater 4,188 3,796
Total Fair Value 4,188 7,871
Amortized Cost    
Amortized cost, less than 12 months   4,158
12 months and greater 4,802 4,801
Total Cost or Amortized Cost 4,802 8,959
Unrealized Loss    
Less than 12 months   (83)
12 months and greater (614) (1,005)
Total Unrealized Loss (614) (1,088)
Agency MBS    
Fair value    
Less than 12 months 149,151 108,772
12 months and greater 273,022 233,625
Total Fair Value 422,173 342,397
Amortized Cost    
Amortized cost, less than 12 months 149,737 111,674
12 months and greater 303,901 273,972
Total Cost or Amortized Cost 453,638 385,646
Unrealized Loss    
Less than 12 months (586) (2,902)
12 months and greater (30,879) (40,347)
Total Unrealized Loss (31,465) (43,249)
ABS/CMBS/MBS    
Fair value    
Less than 12 months 72,227 43,027
12 months and greater 149,479 164,433
Total Fair Value 221,706 207,460
Amortized Cost    
Amortized cost, less than 12 months 72,333 43,395
12 months and greater 166,162 186,990
Total Cost or Amortized Cost 238,495 230,385
Unrealized Loss    
Less than 12 months (106) (368)
12 months and greater (16,683) (22,557)
Total Unrealized Loss (16,789) (22,925)
Corporate    
Fair value    
Less than 12 months 141,450 378,305
12 months and greater 622,539 700,574
Total Fair Value 763,989 1,078,879
Amortized Cost    
Amortized cost, less than 12 months 142,776 389,299
12 months and greater 649,774 745,283
Total Cost or Amortized Cost 792,550 1,134,582
Unrealized Loss    
Less than 12 months (1,326) (10,994)
12 months and greater (27,235) (44,709)
Total Unrealized Loss (28,561) (55,703)
Municipal    
Fair value    
Less than 12 months 8,179 48,514
12 months and greater 349,045 355,475
Total Fair Value 357,224 403,989
Amortized Cost    
Amortized cost, less than 12 months 8,462 49,491
12 months and greater 419,743 444,018
Total Cost or Amortized Cost 428,205 493,509
Unrealized Loss    
Less than 12 months (283) (977)
12 months and greater (70,698) (88,543)
Total Unrealized Loss $ (70,981) $ (89,520)