v3.24.3
Investments (Investments Held in a Loss Position) (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Fair value    
Fair Value $ 2,467,597 $ 2,934,215
Less than 12 months, Fair Value 683,712 293,116
12 months or longer, Fair Value 1,783,885 2,641,099
Unrealized Loss    
Unrealized Loss 185,577 274,690
Less than 12 months, Unrealized Loss 50,772 21,226
12 months or longer, Unrealized Loss 134,805 253,464
U.S. Treasury obligations    
Fair value    
Fair Value 198,432 213,634
Less than 12 months, Fair Value 27,703 32,925
12 months or longer, Fair Value 170,729 180,709
Unrealized Loss    
Unrealized Loss 10,842 16,474
Less than 12 months, Unrealized Loss 1,292 1,364
12 months or longer, Unrealized Loss 9,550 15,110
U.S. Government-sponsored enterprise obligations    
Fair value    
Fair Value 13,331 18,428
Less than 12 months, Fair Value 3,592 4,128
12 months or longer, Fair Value 9,739 14,300
Unrealized Loss    
Unrealized Loss 571 1,030
Less than 12 months, Unrealized Loss 108 242
12 months or longer, Unrealized Loss 463 788
State and municipal bonds    
Fair value    
Fair Value 331,314 378,313
Less than 12 months, Fair Value 61,506 48,960
12 months or longer, Fair Value 269,808 329,353
Unrealized Loss    
Unrealized Loss 19,537 29,871
Less than 12 months, Unrealized Loss 3,114 2,287
12 months or longer, Unrealized Loss 16,423 27,584
Corporate debt    
Fair value    
Fair Value 1,273,208 1,524,940
Less than 12 months, Fair Value 342,657 84,221
12 months or longer, Fair Value 930,551 1,440,719
Unrealized Loss    
Unrealized Loss 88,245 136,759
Less than 12 months, Unrealized Loss 25,164 5,054
12 months or longer, Unrealized Loss 63,081 131,705
Residential mortgage-backed securities    
Fair value    
Fair Value 309,441 313,082
Less than 12 months, Fair Value 115,007 74,463
12 months or longer, Fair Value 194,434 238,619
Unrealized Loss    
Unrealized Loss 45,427 53,795
Less than 12 months, Unrealized Loss 13,302 10,271
12 months or longer, Unrealized Loss 32,125 43,524
Agency commercial mortgage-backed securities    
Fair value    
Fair Value 6,805 7,955
Less than 12 months, Fair Value 1,936 212
12 months or longer, Fair Value 4,869 7,743
Unrealized Loss    
Unrealized Loss 785 987
Less than 12 months, Unrealized Loss 278 1
12 months or longer, Unrealized Loss 507 986
Other commercial mortgage-backed securities    
Fair value    
Fair Value 164,264 184,416
Less than 12 months, Fair Value 73,422 18,092
12 months or longer, Fair Value 90,842 166,324
Unrealized Loss    
Unrealized Loss 12,027 20,904
Less than 12 months, Unrealized Loss 4,891 1,140
12 months or longer, Unrealized Loss 7,136 19,764
Other asset-backed securities    
Fair value    
Fair Value 170,802 293,447
Less than 12 months, Fair Value 57,889 30,115
12 months or longer, Fair Value 112,913 263,332
Unrealized Loss    
Unrealized Loss 8,143 14,870
Less than 12 months, Unrealized Loss 2,623 867
12 months or longer, Unrealized Loss $ 5,520 $ 14,003