v3.26.3
Investments - Available-For-Sale Securities in a Gross Unrealized Loss Position by Length of Time (Details)
$ in Thousands
Sep. 30, 2026
USD ($)
holding
Dec. 31, 2025
USD ($)
holding
Investment grade    
Fair value    
Less than 12 months $ 1,034,967 $ 144,472
12 months or longer 93,765 144,604
Total 1,128,732 289,076
Unrealized losses    
Less than 12 months 31,206 433
12 months or longer 17,284 12,773
Total $ 48,490 $ 13,206
No. of holdings | holding 1,009 371
Non-investment grade    
Fair value    
Less than 12 months $ 57,051 $ 37,154
12 months or longer 3,172 15,975
Total 60,223 53,129
Unrealized losses    
Less than 12 months 1,857 1,426
12 months or longer 336 1,193
Total $ 2,193 $ 2,619
No. of holdings | holding 57 376
Corporate debt securities    
Fair value    
Less than 12 months $ 669,122 $ 72,699
12 months or longer 9,475 41,040
Total 678,597 113,739
Unrealized losses    
Less than 12 months 20,084 1,555
12 months or longer 854 1,630
Total $ 20,938 $ 3,185
No. of holdings | holding 448 418
Collateralized debt obligations    
Fair value    
Less than 12 months $ 138,382 $ 57,917
12 months or longer 2,335 3,909
Total 140,717 61,826
Unrealized losses    
Less than 12 months 490 120
12 months or longer 15 44
Total $ 505 $ 164
No. of holdings | holding 150 83
Commercial mortgage-backed securities    
Fair value    
Less than 12 months $ 112,861 $ 16,103
12 months or longer 15,735 19,956
Total 128,596 36,059
Unrealized losses    
Less than 12 months 3,266 59
12 months or longer 1,750 1,724
Total $ 5,016 $ 1,783
No. of holdings | holding 185 70
Residential mortgage-backed securities    
Fair value    
Less than 12 months $ 139,306 $ 17,675
12 months or longer 66,009 92,019
Total 205,315 109,694
Unrealized losses    
Less than 12 months 8,410 27
12 months or longer 14,754 10,353
Total $ 23,164 $ 10,380
No. of holdings | holding 213 146
Other debt securities    
Fair value    
Less than 12 months $ 31,507 $ 3,936
12 months or longer 3,383 3,655
Total 34,890 7,591
Unrealized losses    
Less than 12 months 760 39
12 months or longer 247 215
Total $ 1,007 $ 254
No. of holdings | holding 69 27
U.S. Treasury    
Fair value    
Less than 12 months $ 840 $ 13,296
12 months or longer 0 0
Total 840 13,296
Unrealized losses    
Less than 12 months 53 59
12 months or longer 0 0
Total $ 53 $ 59
No. of holdings | holding 1 3
Available-for-sale securities    
Fair value    
Less than 12 months $ 1,092,018 $ 181,626
12 months or longer 96,937 160,579
Total 1,188,955 342,205
Unrealized losses    
Less than 12 months 33,063 1,859
12 months or longer 17,620 13,966
Total $ 50,683 $ 15,825
No. of holdings | holding 1,066 747