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Reserve for Loss and Loss Expense - Schedule of Short-duration Insurance Contracts, Claims Development (Details)
$ in Thousands
Dec. 31, 2024
USD ($)
claim
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 17,240,492                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 12,222,095                  
Total liabilities for unpaid loss and loss expenses, net of reinsurance 5,397,736                  
Standard Commercial Lines | General liability                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 4,233,645                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 1,943,633                  
Total liabilities for unpaid loss and loss expenses, net of reinsurance 2,432,883                  
Standard Commercial Lines | Workers Compensation                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 1,691,144                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 1,138,179                  
Total liabilities for unpaid loss and loss expenses, net of reinsurance 757,202                  
Standard Commercial Lines | Commercial automobile                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 4,451,896                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 3,383,498                  
Total liabilities for unpaid loss and loss expenses, net of reinsurance 1,073,194                  
Standard Commercial Lines | Businessowners’ policies                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 680,409                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 570,813                  
Total liabilities for unpaid loss and loss expenses, net of reinsurance 117,985                  
Standard Commercial Lines | Commercial property                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 2,236,753                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 2,084,845                  
Total liabilities for unpaid loss and loss expenses, net of reinsurance 151,963                  
Standard Personal Lines | Personal automobile                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 1,229,833                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 1,081,359                  
Total liabilities for unpaid loss and loss expenses, net of reinsurance 154,177                  
Standard Personal Lines | Homeowners                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 937,241                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 888,657                  
Total liabilities for unpaid loss and loss expenses, net of reinsurance 53,380                  
E&S Lines | Casualty lines                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 1,246,514                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 652,474                  
Total liabilities for unpaid loss and loss expenses, net of reinsurance 601,439                  
Short-duration Insurance Contracts, Accident Year 2014                    
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total liabilities for unpaid loss and loss expenses, net of reinsurance 379,339                  
Short-duration Insurance Contracts, Accident Year 2014 | Standard Commercial Lines | General liability                    
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total liabilities for unpaid loss and loss expenses, net of reinsurance 142,871                  
Short-duration Insurance Contracts, Accident Year 2014 | Standard Commercial Lines | Workers Compensation                    
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total liabilities for unpaid loss and loss expenses, net of reinsurance 204,237                  
Short-duration Insurance Contracts, Accident Year 2014 | Standard Commercial Lines | Commercial automobile                    
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total liabilities for unpaid loss and loss expenses, net of reinsurance 4,796                  
Short-duration Insurance Contracts, Accident Year 2014 | Standard Commercial Lines | Businessowners’ policies                    
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total liabilities for unpaid loss and loss expenses, net of reinsurance 8,389                  
Short-duration Insurance Contracts, Accident Year 2014 | Standard Commercial Lines | Commercial property                    
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total liabilities for unpaid loss and loss expenses, net of reinsurance 55                  
Short-duration Insurance Contracts, Accident Year 2014 | Standard Personal Lines | Personal automobile                    
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total liabilities for unpaid loss and loss expenses, net of reinsurance 5,703                  
Short-duration Insurance Contracts, Accident Year 2014 | Standard Personal Lines | Homeowners                    
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total liabilities for unpaid loss and loss expenses, net of reinsurance 4,796                  
Short-duration Insurance Contracts, Accident Year 2014 | E&S Lines | Casualty lines                    
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total liabilities for unpaid loss and loss expenses, net of reinsurance 7,399                  
Short-duration Insurance Contracts, Accident Year 2015                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 1,104,250 $ 1,105,039 $ 1,103,543 $ 1,103,592 $ 1,108,860 $ 1,119,441 $ 1,138,313 $ 1,144,830 $ 1,130,513 $ 1,114,081
IBNR $ 29,315                  
Cumulative Number of Reported Claims | claim 95,762                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 1,042,528 1,032,064 1,018,023 1,000,509 967,857 929,222 845,868 725,385 581,203 376,641
Short-duration Insurance Contracts, Accident Year 2015 | Standard Commercial Lines | General liability                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 214,672 213,653 210,137 211,768 214,176 219,204 233,249 246,990 245,710 254,720
IBNR $ 11,840                  
Cumulative Number of Reported Claims | claim 10,623                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 192,275 186,336 179,117 173,697 157,071 144,216 116,804 78,668 39,978 14,665
Short-duration Insurance Contracts, Accident Year 2015 | Standard Commercial Lines | Workers Compensation                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 165,050 166,042 169,008 170,577 172,572 176,242 179,642 183,604 194,639 193,729
IBNR $ 14,710                  
Cumulative Number of Reported Claims | claim 10,554                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 134,405 133,272 132,235 129,019 124,046 120,097 112,601 98,195 77,320 33,857
Short-duration Insurance Contracts, Accident Year 2015 | Standard Commercial Lines | Commercial automobile                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 263,301 263,115 262,766 262,054 261,386 260,565 259,495 253,074 240,958 220,994
IBNR $ 178                  
Cumulative Number of Reported Claims | claim 30,579                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 261,389 260,328 257,668 255,600 249,905 238,142 211,515 175,866 132,260 91,347
Short-duration Insurance Contracts, Accident Year 2015 | Standard Commercial Lines | Businessowners’ policies                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 51,551 51,457 52,514 52,200 52,325 54,454 55,925 57,245 53,768 52,871
IBNR $ 24                  
Cumulative Number of Reported Claims | claim 3,973                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 51,335 51,308 51,120 50,005 49,839 49,073 46,571 42,710 36,014 24,189
Short-duration Insurance Contracts, Accident Year 2015 | Standard Commercial Lines | Commercial property                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 112,965 112,974 112,915 112,937 112,582 112,496 111,566 111,750 109,513 110,270
IBNR $ 7                  
Cumulative Number of Reported Claims | claim 6,408                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 112,560 112,568 112,391 112,410 112,117 110,969 110,994 109,829 106,182 79,048
Short-duration Insurance Contracts, Accident Year 2015 | Standard Personal Lines | Personal automobile                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 98,860 98,939 98,669 98,596 98,588 98,718 99,570 100,214 99,698 96,387
IBNR $ (44)                  
Cumulative Number of Reported Claims | claim 20,866                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 98,798 98,483 97,920 97,761 97,275 95,997 92,102 87,163 76,470 58,725
Short-duration Insurance Contracts, Accident Year 2015 | Standard Personal Lines | Homeowners                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 74,251 74,265 74,237 74,682 74,673 74,978 74,723 76,559 76,400 76,637
IBNR $ 32                  
Cumulative Number of Reported Claims | claim 7,754                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 74,119 74,108 74,108 74,096 74,052 74,079 72,927 72,202 70,078 52,589
Short-duration Insurance Contracts, Accident Year 2015 | E&S Lines | Casualty lines                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 90,462 91,424 90,263 87,662 90,126 90,355 90,488 82,404 76,432 75,498
IBNR $ 2,524                  
Cumulative Number of Reported Claims | claim 2,916,000                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 85,569 83,587 81,396 75,844 71,421 64,529 50,712 29,389 13,057 $ 3,036
Short-duration Insurance Contracts, Accident Year 2016                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 1,164,173 1,163,467 1,167,539 1,171,273 1,180,829 1,199,734 1,227,142 1,203,634 1,188,608  
IBNR $ 38,759                  
Cumulative Number of Reported Claims | claim 96,680                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 1,106,036 1,088,453 1,061,952 1,025,264 983,852 892,390 764,331 617,958 387,272  
Short-duration Insurance Contracts, Accident Year 2016 | Standard Commercial Lines | General liability                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 247,611 244,782 243,669 246,643 252,733 263,245 277,986 272,048 277,214  
IBNR $ 18,447                  
Cumulative Number of Reported Claims | claim 10,940                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 222,067 211,725 199,032 181,770 164,136 133,757 89,431 46,549 15,684  
Short-duration Insurance Contracts, Accident Year 2016 | Standard Commercial Lines | Workers Compensation                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 147,479 147,732 151,961 155,210 156,540 166,009 176,248 184,946 196,774  
IBNR $ 16,087                  
Cumulative Number of Reported Claims | claim 10,587                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 124,923 123,232 122,186 119,800 115,159 109,166 98,037 78,531 34,525  
Short-duration Insurance Contracts, Accident Year 2016 | Standard Commercial Lines | Commercial automobile                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 294,371 294,878 294,297 291,674 290,359 285,304 285,302 274,367 255,187  
IBNR $ 600                  
Cumulative Number of Reported Claims | claim 32,610                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 291,380 288,512 284,870 277,242 264,858 233,939 200,701 155,720 106,022  
Short-duration Insurance Contracts, Accident Year 2016 | Standard Commercial Lines | Businessowners’ policies                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 52,835 52,930 53,201 53,147 53,367 53,835 54,993 53,792 52,335  
IBNR $ 114                  
Cumulative Number of Reported Claims | claim 3,858                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 52,499 52,427 52,070 50,536 48,786 45,308 39,973 36,848 24,655  
Short-duration Insurance Contracts, Accident Year 2016 | Standard Commercial Lines | Commercial property                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 123,137 123,067 123,126 123,005 123,567 124,487 125,937 126,185 121,927  
IBNR $ 10                  
Cumulative Number of Reported Claims | claim 6,744                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 123,279 123,203 123,265 122,909 123,601 123,828 122,930 118,789 83,966  
Short-duration Insurance Contracts, Accident Year 2016 | Standard Personal Lines | Personal automobile                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 100,287 100,458 100,395 99,858 99,544 101,140 100,202 98,032 92,727  
IBNR $ (54)                  
Cumulative Number of Reported Claims | claim 19,827                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 100,359 100,315 99,656 98,977 98,080 94,372 86,752 76,823 57,961  
Short-duration Insurance Contracts, Accident Year 2016 | Standard Personal Lines | Homeowners                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 60,441 60,453 60,841 60,855 61,735 61,723 62,391 60,931 60,105  
IBNR $ 33                  
Cumulative Number of Reported Claims | claim 6,896                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 60,480 60,480 60,474 60,449 61,187 60,082 59,546 57,333 42,252  
Short-duration Insurance Contracts, Accident Year 2016 | E&S Lines | Casualty lines                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 100,039 101,105 101,873 102,476 104,730 105,120 104,655 96,416 94,451  
IBNR $ 3,445                  
Cumulative Number of Reported Claims | claim 3,043,000                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 93,152 90,665 81,932 75,004 69,448 56,581 33,950 16,195 $ 3,720  
Short-duration Insurance Contracts, Accident Year 2017                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 1,295,753 1,287,882 1,273,039 1,268,941 1,288,526 1,313,585 1,313,372 1,270,110    
IBNR $ 50,141                  
Cumulative Number of Reported Claims | claim 100,703                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 1,219,053 1,180,346 1,116,336 1,050,258 954,792 829,134 678,453 433,440    
Short-duration Insurance Contracts, Accident Year 2017 | Standard Commercial Lines | General liability                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 299,118 293,448 283,379 278,607 289,883 301,384 293,128 293,747    
IBNR $ 26,871                  
Cumulative Number of Reported Claims | claim 11,529                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 260,015 241,879 201,948 167,002 131,980 92,355 49,470 17,366    
Short-duration Insurance Contracts, Accident Year 2017 | Standard Commercial Lines | Workers Compensation                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 149,400 148,949 151,221 154,159 162,672 175,853 184,306 195,202    
IBNR $ 16,582                  
Cumulative Number of Reported Claims | claim 10,814                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 126,684 123,573 120,468 116,426 110,645 100,645 82,216 40,375    
Short-duration Insurance Contracts, Accident Year 2017 | Standard Commercial Lines | Commercial automobile                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 326,740 326,832 325,654 326,461 322,197 324,291 329,389 301,274    
IBNR $ 1,508                  
Cumulative Number of Reported Claims | claim 33,910                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 323,126 318,047 309,810 296,600 262,349 220,422 178,823 117,287    
Short-duration Insurance Contracts, Accident Year 2017 | Standard Commercial Lines | Businessowners’ policies                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 42,811 42,408 42,374 43,606 48,067 51,524 48,698 46,624    
IBNR $ 86                  
Cumulative Number of Reported Claims | claim 3,899                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 42,491 41,217 40,845 39,940 40,359 36,950 31,337 21,865    
Short-duration Insurance Contracts, Accident Year 2017 | Standard Commercial Lines | Commercial property                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 156,590 155,408 154,942 154,119 153,664 149,044 149,106 138,773    
IBNR $ 13                  
Cumulative Number of Reported Claims | claim 6,907                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 155,246 155,236 154,689 153,750 152,018 148,589 142,338 99,047    
Short-duration Insurance Contracts, Accident Year 2017 | Standard Personal Lines | Personal automobile                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 104,998 105,243 105,079 103,557 103,260 103,653 105,139 101,880    
IBNR $ 109                  
Cumulative Number of Reported Claims | claim 20,751                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 104,831 104,114 103,556 100,521 97,628 91,479 82,730 62,854    
Short-duration Insurance Contracts, Accident Year 2017 | Standard Personal Lines | Homeowners                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 68,498 68,919 68,902 68,938 70,064 70,365 67,978 59,167    
IBNR $ 32                  
Cumulative Number of Reported Claims | claim 7,391                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 68,466 68,454 68,282 68,078 67,767 67,193 63,290 45,466    
Short-duration Insurance Contracts, Accident Year 2017 | E&S Lines | Casualty lines                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 108,219 106,663 102,045 99,960 99,395 99,866 95,783 91,438    
IBNR $ 4,842                  
Cumulative Number of Reported Claims | claim 2,888,000                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 99,141 88,294 77,090 68,266 53,238 34,179 14,672 $ 5,057    
Short-duration Insurance Contracts, Accident Year 2018                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 1,432,093 1,424,953 1,425,540 1,441,303 1,457,415 1,461,603 1,413,800      
IBNR $ 80,284                  
Cumulative Number of Reported Claims | claim 107,973                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 1,301,950 1,252,623 1,187,744 1,083,556 942,893 779,466 511,271      
Short-duration Insurance Contracts, Accident Year 2018 | Standard Commercial Lines | General liability                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 330,054 329,102 324,567 332,013 345,224 336,326 317,934      
IBNR $ 44,580                  
Cumulative Number of Reported Claims | claim 12,025                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 261,198 236,812 197,286 155,538 108,421 60,784 19,531      
Short-duration Insurance Contracts, Accident Year 2018 | Standard Commercial Lines | Workers Compensation                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 163,478 163,884 167,974 173,428 181,151 193,818 193,894      
IBNR $ 19,530                  
Cumulative Number of Reported Claims | claim 11,139                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 133,879 129,869 126,206 119,904 105,903 84,780 41,122      
Short-duration Insurance Contracts, Accident Year 2018 | Standard Commercial Lines | Commercial automobile                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 347,964 346,213 348,202 350,310 345,547 352,487 347,908      
IBNR $ 3,222                  
Cumulative Number of Reported Claims | claim 36,566                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 338,550 330,584 319,819 291,725 243,713 193,788 134,867      
Short-duration Insurance Contracts, Accident Year 2018 | Standard Commercial Lines | Businessowners’ policies                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 54,668 55,586 56,625 60,393 62,427 57,202 55,024      
IBNR $ 424                  
Cumulative Number of Reported Claims | claim 4,267                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 54,213 52,496 51,239 48,144 44,316 39,791 29,995      
Short-duration Insurance Contracts, Accident Year 2018 | Standard Commercial Lines | Commercial property                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 196,388 196,527 196,413 194,016 192,558 190,834 183,177      
IBNR $ 21                  
Cumulative Number of Reported Claims | claim 8,295                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 196,485 196,605 196,376 193,487 192,698 184,813 135,416      
Short-duration Insurance Contracts, Accident Year 2018 | Standard Personal Lines | Personal automobile                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 113,767 113,037 113,647 112,418 112,030 113,569 111,594      
IBNR $ 399                  
Cumulative Number of Reported Claims | claim 22,686                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 111,411 110,894 109,644 107,026 99,982 89,628 69,721      
Short-duration Insurance Contracts, Accident Year 2018 | Standard Personal Lines | Homeowners                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 68,106 68,581 68,416 68,931 69,832 68,526 62,961      
IBNR $ 132                  
Cumulative Number of Reported Claims | claim 7,609                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 67,943 67,726 67,739 66,634 65,348 64,137 49,430      
Short-duration Insurance Contracts, Accident Year 2018 | E&S Lines | Casualty lines                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 111,997 106,490 105,756 104,983 103,184 103,004 98,324      
IBNR $ 11,221                  
Cumulative Number of Reported Claims | claim 2,882,000                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 93,360 82,549 73,605 57,962 39,174 21,337 $ 5,509      
Short-duration Insurance Contracts, Accident Year 2019                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 1,534,266 1,523,313 1,529,859 1,526,566 1,523,041 1,483,945        
IBNR $ 127,788                  
Cumulative Number of Reported Claims | claim 105,134                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 1,339,564 1,247,100 1,109,628 949,996 781,462 510,091        
Short-duration Insurance Contracts, Accident Year 2019 | Standard Commercial Lines | General liability                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 365,212 362,139 366,184 358,301 356,363 347,150        
IBNR $ 75,401                  
Cumulative Number of Reported Claims | claim 11,896                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 259,726 213,020 160,680 100,206 58,284 18,097        
Short-duration Insurance Contracts, Accident Year 2019 | Standard Commercial Lines | Workers Compensation                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 161,241 159,225 164,940 174,912 188,596 188,625        
IBNR $ 23,005                  
Cumulative Number of Reported Claims | claim 10,334                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 126,436 119,875 112,649 100,812 77,878 37,826        
Short-duration Insurance Contracts, Accident Year 2019 | Standard Commercial Lines | Commercial automobile                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 415,684 410,432 407,051 404,854 398,346 385,212        
IBNR $ 7,777                  
Cumulative Number of Reported Claims | claim 36,927                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 400,262 376,550 331,152 283,410 221,590 149,538        
Short-duration Insurance Contracts, Accident Year 2019 | Standard Commercial Lines | Businessowners’ policies                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 63,713 64,721 65,762 64,667 59,466 53,531        
IBNR $ 1,326                  
Cumulative Number of Reported Claims | claim 3,653                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 60,792 60,076 52,887 46,113 41,587 27,718        
Short-duration Insurance Contracts, Accident Year 2019 | Standard Commercial Lines | Commercial property                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 180,563 180,832 180,605 179,574 177,075 173,826        
IBNR $ 44                  
Cumulative Number of Reported Claims | claim 7,318                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 180,266 180,179 179,538 177,825 172,768 130,891        
Short-duration Insurance Contracts, Accident Year 2019 | Standard Personal Lines | Personal automobile                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 119,409 119,632 118,669 115,993 115,688 114,043        
IBNR $ 816                  
Cumulative Number of Reported Claims | claim 22,873                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 118,221 115,919 109,844 102,930 92,162 69,699        
Short-duration Insurance Contracts, Accident Year 2019 | Standard Personal Lines | Homeowners                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 72,003 72,856 73,070 73,816 72,772 64,306        
IBNR $ 193                  
Cumulative Number of Reported Claims | claim 7,013                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 71,796 71,603 70,880 69,911 67,631 49,680        
Short-duration Insurance Contracts, Accident Year 2019 | E&S Lines | Casualty lines                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 118,356 114,802 117,113 117,736 118,298 117,087        
IBNR $ 18,692                  
Cumulative Number of Reported Claims | claim 2,800,000                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 85,945 73,779 57,701 35,844 17,812 $ 4,422        
Short-duration Insurance Contracts, Accident Year 2020                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 1,555,820 1,531,446 1,550,195 1,587,607 1,591,972          
IBNR $ 183,656                  
Cumulative Number of Reported Claims | claim 96,043                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 1,287,402 1,152,227 988,463 831,976 572,302          
Short-duration Insurance Contracts, Accident Year 2020 | Standard Commercial Lines | General liability                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 389,512 361,163 352,834 360,302 361,554          
IBNR $ 120,496                  
Cumulative Number of Reported Claims | claim 10,284                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 230,949 159,209 100,356 58,699 21,858          
Short-duration Insurance Contracts, Accident Year 2020 | Standard Commercial Lines | Workers Compensation                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 140,033 143,384 159,229 168,594 168,643          
IBNR $ 20,188                  
Cumulative Number of Reported Claims | claim 7,559                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 106,644 102,142 87,211 68,277 29,559          
Short-duration Insurance Contracts, Accident Year 2020 | Standard Commercial Lines | Commercial automobile                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 371,272 374,293 375,636 381,163 381,654          
IBNR $ 14,953                  
Cumulative Number of Reported Claims | claim 30,696                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 337,369 306,355 254,365 198,034 139,016          
Short-duration Insurance Contracts, Accident Year 2020 | Standard Commercial Lines | Businessowners’ policies                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 73,148 73,320 73,077 73,680 71,836          
IBNR $ 1,646                  
Cumulative Number of Reported Claims | claim 5,452                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 69,462 66,478 60,596 57,210 43,376          
Short-duration Insurance Contracts, Accident Year 2020 | Standard Commercial Lines | Commercial property                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 226,058 226,915 226,107 225,278 232,060          
IBNR $ 62                  
Cumulative Number of Reported Claims | claim 10,158                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 225,589 223,902 220,953 215,107 164,613          
Short-duration Insurance Contracts, Accident Year 2020 | Standard Personal Lines | Personal automobile                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 89,249 89,027 90,179 94,532 95,625          
IBNR $ 1,513                  
Cumulative Number of Reported Claims | claim 17,551                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 86,558 83,137 76,710 68,691 53,407          
Short-duration Insurance Contracts, Accident Year 2020 | Standard Personal Lines | Homeowners                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 112,080 112,590 113,804 112,523 109,033          
IBNR $ 350                  
Cumulative Number of Reported Claims | claim 9,837                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 111,466 110,578 109,145 105,690 83,838          
Short-duration Insurance Contracts, Accident Year 2020 | E&S Lines | Casualty lines                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 96,911 91,077 95,832 103,137 103,872          
IBNR $ 23,793                  
Cumulative Number of Reported Claims | claim 1,971,000                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 62,729 46,349 27,861 13,064 $ 3,695          
Short-duration Insurance Contracts, Accident Year 2021                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 1,797,745 1,774,984 1,781,054 1,784,661            
IBNR $ 311,183                  
Cumulative Number of Reported Claims | claim 100,424                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 1,322,871 1,134,930 934,965 609,889            
Short-duration Insurance Contracts, Accident Year 2021 | Standard Commercial Lines | General liability                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 463,259 414,204 414,279 422,748            
IBNR $ 191,124                  
Cumulative Number of Reported Claims | claim 11,337                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 206,834 131,157 71,664 28,069            
Short-duration Insurance Contracts, Accident Year 2021 | Standard Commercial Lines | Workers Compensation                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 153,093 173,784 185,151 185,198            
IBNR $ 23,006                  
Cumulative Number of Reported Claims | claim 8,590                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 109,473 96,674 76,015 32,918            
Short-duration Insurance Contracts, Accident Year 2021 | Standard Commercial Lines | Commercial automobile                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 507,344 510,825 512,673 483,831            
IBNR $ 45,365                  
Cumulative Number of Reported Claims | claim 37,409                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 416,245 352,383 283,411 187,200            
Short-duration Insurance Contracts, Accident Year 2021 | Standard Commercial Lines | Businessowners’ policies                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 71,228 72,231 63,648 66,312            
IBNR $ 4,672                  
Cumulative Number of Reported Claims | claim 3,540                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 60,137 54,651 47,436 34,412            
Short-duration Insurance Contracts, Accident Year 2021 | Standard Commercial Lines | Commercial property                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 235,273 237,831 239,822 246,319            
IBNR $ 201                  
Cumulative Number of Reported Claims | claim 7,990                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 236,576 235,217 227,259 161,757            
Short-duration Insurance Contracts, Accident Year 2021 | Standard Personal Lines | Personal automobile                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 106,344 105,088 102,777 108,244            
IBNR $ 3,127                  
Cumulative Number of Reported Claims | claim 19,743                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 99,768 94,480 84,743 65,325            
Short-duration Insurance Contracts, Accident Year 2021 | Standard Personal Lines | Homeowners                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 81,852 84,189 83,295 82,425            
IBNR $ 280                  
Cumulative Number of Reported Claims | claim 6,928                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 80,129 79,399 77,018 59,054            
Short-duration Insurance Contracts, Accident Year 2021 | E&S Lines | Casualty lines                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 123,031 120,191 125,436 128,099            
IBNR $ 42,120                  
Cumulative Number of Reported Claims | claim 2,147,000                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 59,210 37,213 15,835 $ 4,326            
Short-duration Insurance Contracts, Accident Year 2022                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 2,200,062 2,096,742 2,073,343              
IBNR $ 562,919                  
Cumulative Number of Reported Claims | claim 107,331                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 1,388,177 1,155,527 699,789              
Short-duration Insurance Contracts, Accident Year 2022 | Standard Commercial Lines | General liability                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 597,562 482,279 482,590              
IBNR $ 325,331                  
Cumulative Number of Reported Claims | claim 12,151                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 169,702 93,422 31,502              
Short-duration Insurance Contracts, Accident Year 2022 | Standard Commercial Lines | Workers Compensation                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 197,817 207,156 207,206              
IBNR $ 45,518                  
Cumulative Number of Reported Claims | claim 8,994                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 124,320 99,894 45,814              
Short-duration Insurance Contracts, Accident Year 2022 | Standard Commercial Lines | Commercial automobile                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 577,111 581,223 572,421              
IBNR $ 96,685                  
Cumulative Number of Reported Claims | claim 40,254                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 411,245 336,516 216,180              
Short-duration Insurance Contracts, Accident Year 2022 | Standard Commercial Lines | Businessowners’ policies                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 88,059 89,025 86,194              
IBNR $ 10,037                  
Cumulative Number of Reported Claims | claim 3,832                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 70,544 66,581 36,421              
Short-duration Insurance Contracts, Accident Year 2022 | Standard Commercial Lines | Commercial property                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 290,405 296,974 297,318              
IBNR $ (857)                  
Cumulative Number of Reported Claims | claim 8,864                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 290,168 285,250 186,677              
Short-duration Insurance Contracts, Accident Year 2022 | Standard Personal Lines | Personal automobile                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 138,559 133,623 121,030              
IBNR $ 9,807                  
Cumulative Number of Reported Claims | claim 21,315                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 120,482 107,778 75,994              
Short-duration Insurance Contracts, Accident Year 2022 | Standard Personal Lines | Homeowners                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 98,594 100,389 93,826              
IBNR $ 1,622                  
Cumulative Number of Reported Claims | claim 6,899                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 96,777 91,788 68,832              
Short-duration Insurance Contracts, Accident Year 2022 | E&S Lines | Casualty lines                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 150,362 145,918 146,999              
IBNR $ 72,194                  
Cumulative Number of Reported Claims | claim 2,210,000                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 48,832 21,618 $ 4,198              
Short-duration Insurance Contracts, Accident Year 2023                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 2,421,556 2,337,320                
IBNR $ 861,418                  
Cumulative Number of Reported Claims | claim 110,576                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 1,292,282 843,967                
Short-duration Insurance Contracts, Accident Year 2023 | Standard Commercial Lines | General liability                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 608,632 541,559                
IBNR $ 436,191                  
Cumulative Number of Reported Claims | claim 11,397                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 99,616 30,743                
Short-duration Insurance Contracts, Accident Year 2023 | Standard Commercial Lines | Workers Compensation                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 204,083 204,240                
IBNR $ 59,654                  
Cumulative Number of Reported Claims | claim 8,789                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 102,367 49,253                
Short-duration Insurance Contracts, Accident Year 2023 | Standard Commercial Lines | Commercial automobile                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 660,063 633,529                
IBNR $ 205,119                  
Cumulative Number of Reported Claims | claim 39,202                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 365,948 237,931                
Short-duration Insurance Contracts, Accident Year 2023 | Standard Commercial Lines | Businessowners’ policies                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 83,676 80,943                
IBNR $ 16,972                  
Cumulative Number of Reported Claims | claim 3,551                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 60,754 45,021                
Short-duration Insurance Contracts, Accident Year 2023 | Standard Commercial Lines | Commercial property                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 327,174 341,585                
IBNR $ 2,315                  
Cumulative Number of Reported Claims | claim 7,829                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 311,906 226,872                
Short-duration Insurance Contracts, Accident Year 2023 | Standard Personal Lines | Personal automobile                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 174,229 172,104                
IBNR $ 23,393                  
Cumulative Number of Reported Claims | claim 26,980                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 137,142 102,642                
Short-duration Insurance Contracts, Accident Year 2023 | Standard Personal Lines | Homeowners                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 143,481 137,029                
IBNR $ 4,137                  
Cumulative Number of Reported Claims | claim 8,005                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 137,605 101,952                
Short-duration Insurance Contracts, Accident Year 2023 | E&S Lines | Casualty lines                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 158,509 157,260                
IBNR $ 109,724                  
Cumulative Number of Reported Claims | claim 1,865,000                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 19,632 $ 4,887                
Short-duration Insurance Contracts, Accident Year 2024                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 2,734,774                  
IBNR $ 1,457,452                  
Cumulative Number of Reported Claims | claim 100,007                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 922,232                  
Short-duration Insurance Contracts, Accident Year 2024 | Standard Commercial Lines | General liability                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 718,013                  
IBNR $ 620,833                  
Cumulative Number of Reported Claims | claim 9,257                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 41,251                  
Short-duration Insurance Contracts, Accident Year 2024 | Standard Commercial Lines | Workers Compensation                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 209,470                  
IBNR $ 107,954                  
Cumulative Number of Reported Claims | claim 8,527                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 49,048                  
Short-duration Insurance Contracts, Accident Year 2024 | Standard Commercial Lines | Commercial automobile                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 688,046                  
IBNR $ 364,444                  
Cumulative Number of Reported Claims | claim 36,820                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 237,984                  
Short-duration Insurance Contracts, Accident Year 2024 | Standard Commercial Lines | Businessowners’ policies                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 98,720                  
IBNR $ 31,856                  
Cumulative Number of Reported Claims | claim 3,507                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 48,586                  
Short-duration Insurance Contracts, Accident Year 2024 | Standard Commercial Lines | Commercial property                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 388,200                  
IBNR $ 64,626                  
Cumulative Number of Reported Claims | claim 6,952                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 252,770                  
Short-duration Insurance Contracts, Accident Year 2024 | Standard Personal Lines | Personal automobile                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 184,131                  
IBNR $ 52,995                  
Cumulative Number of Reported Claims | claim 23,929                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 103,789                  
Short-duration Insurance Contracts, Accident Year 2024 | Standard Personal Lines | Homeowners                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 157,935                  
IBNR $ 23,369                  
Cumulative Number of Reported Claims | claim 6,968                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 119,876                  
Short-duration Insurance Contracts, Accident Year 2024 | E&S Lines | Casualty lines                    
Incurred Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total 188,628                  
IBNR $ 166,509                  
Cumulative Number of Reported Claims | claim 1,292,000                  
Cumulative Paid Loss and Allocated Loss Expenses, Net of Reinsurance                    
Total $ 4,904