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RESERVES FOR LOSSES AND LOSS SETTLEMENT EXPENSES - Incurred Claims and Allocated Claim Adjustment Expenses (Details)
claim in Thousands, $ in Thousands
Dec. 31, 2025
USD ($)
claim
Dec. 31, 2024
USD ($)
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 ($)
Dec. 31, 2016
USD ($)
Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 1,929,135                  
Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance   $ 1,514,873                
Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance 1,903,132                  
Commercial workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance 418,098                  
Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance 332,584                  
2016 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance 171,819 164,989 $ 159,284 $ 153,490 $ 148,324 $ 140,784 $ 142,397 $ 136,275 $ 130,041 $ 139,144
Total of incurred but not reported liabilities plus expected development on reported claims 9,488                  
Cumulative development $ 32,675                  
Cumulative number of reported claims | claim 8,613                  
2016 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 142,574 142,814 142,644 145,351 144,109 143,108 143,724 143,721 144,208 147,473
Total of incurred but not reported liabilities plus expected development on reported claims 336                  
Cumulative development $ (4,899)                  
Cumulative number of reported claims | claim 7,604                  
2016 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 173,760 173,858 175,387 175,016 174,588 173,823 175,658 174,337 175,357 174,018
Total of incurred but not reported liabilities plus expected development on reported claims 72                  
Cumulative development $ (258)                  
Cumulative number of reported claims | claim 20,092                  
2016 | Commercial workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 53,430 53,574 53,617 53,090 52,870 53,964 55,168 61,648 66,575 70,419
Total of incurred but not reported liabilities plus expected development on reported claims 955                  
Cumulative development $ (16,989)                  
Cumulative number of reported claims | claim 5,696                  
2016 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 45,180 45,185 45,179 45,199 45,297 45,113 45,961 45,379 45,840 $ 48,072
Total of incurred but not reported liabilities plus expected development on reported claims 21                  
Cumulative development $ (2,892)                  
Cumulative number of reported claims | claim 9,553                  
2017 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 183,879 176,073 174,013 173,091 159,653 156,369 152,547 139,032 139,602  
Total of incurred but not reported liabilities plus expected development on reported claims 14,517                  
Cumulative development $ 44,277                  
Cumulative number of reported claims | claim 10,270                  
2017 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 161,091 161,051 161,611 161,456 161,232 161,693 160,945 160,240 155,139  
Total of incurred but not reported liabilities plus expected development on reported claims 533                  
Cumulative development $ 5,952                  
Cumulative number of reported claims | claim 9,889                  
2017 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 230,174 231,093 234,229 233,535 233,007 233,159 235,110 224,553 227,919  
Total of incurred but not reported liabilities plus expected development on reported claims 245                  
Cumulative development $ 2,255                  
Cumulative number of reported claims | claim 27,325                  
2017 | Commercial workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 47,709 47,943 48,074 47,801 49,362 51,874 55,982 69,528 76,184  
Total of incurred but not reported liabilities plus expected development on reported claims 1,164                  
Cumulative development $ (28,475)                  
Cumulative number of reported claims | claim 7,988                  
2017 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 58,626 58,788 58,863 58,790 59,023 58,544 58,695 59,342 $ 60,330  
Total of incurred but not reported liabilities plus expected development on reported claims 29                  
Cumulative development $ (1,704)                  
Cumulative number of reported claims | claim 11,906                  
2018 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 221,615 213,536 207,501 197,696 187,841 176,496 172,894 163,059    
Total of incurred but not reported liabilities plus expected development on reported claims 18,694                  
Cumulative development $ 58,556                  
Cumulative number of reported claims | claim 9,588                  
2018 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 146,947 147,085 147,058 147,356 146,010 146,378 146,950 143,280    
Total of incurred but not reported liabilities plus expected development on reported claims 679                  
Cumulative development $ 3,667                  
Cumulative number of reported claims | claim 13,548                  
2018 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 251,687 252,642 255,198 255,409 255,017 253,045 245,173 236,629    
Total of incurred but not reported liabilities plus expected development on reported claims 542                  
Cumulative development $ 15,058                  
Cumulative number of reported claims | claim 32,919                  
2018 | Commercial workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 53,818 54,238 54,783 53,813 56,109 59,192 67,883 71,972    
Total of incurred but not reported liabilities plus expected development on reported claims 987                  
Cumulative development $ (18,154)                  
Cumulative number of reported claims | claim 8,250                  
2018 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 51,150 51,216 51,115 51,457 52,062 52,715 51,721 $ 51,639    
Total of incurred but not reported liabilities plus expected development on reported claims 45                  
Cumulative development $ (489)                  
Cumulative number of reported claims | claim 14,721                  
2019 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 193,998 187,539 186,205 179,667 183,918 169,344 149,173      
Total of incurred but not reported liabilities plus expected development on reported claims 21,822                  
Cumulative development $ 44,825                  
Cumulative number of reported claims | claim 9,194                  
2019 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 155,306 155,114 155,850 157,667 158,475 155,482 164,030      
Total of incurred but not reported liabilities plus expected development on reported claims 743                  
Cumulative development $ (8,724)                  
Cumulative number of reported claims | claim 10,821                  
2019 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 273,186 276,095 282,680 282,155 289,929 291,139 279,229      
Total of incurred but not reported liabilities plus expected development on reported claims 427                  
Cumulative development $ (6,043)                  
Cumulative number of reported claims | claim 34,526                  
2019 | Commercial workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 50,749 49,807 49,084 48,945 49,336 49,189 52,136      
Total of incurred but not reported liabilities plus expected development on reported claims 127                  
Cumulative development $ (1,387)                  
Cumulative number of reported claims | claim 8,109                  
2019 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 57,628 57,559 57,630 57,929 58,745 58,378 $ 59,548      
Total of incurred but not reported liabilities plus expected development on reported claims (392)                  
Cumulative development $ (1,920)                  
Cumulative number of reported claims | claim 13,706                  
2020 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 183,575 181,687 179,080 162,471 158,022 171,013        
Total of incurred but not reported liabilities plus expected development on reported claims 32,978                  
Cumulative development $ 12,562                  
Cumulative number of reported claims | claim 8,608                  
2020 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 209,344 209,588 207,256 202,929 201,391 207,207        
Total of incurred but not reported liabilities plus expected development on reported claims 1,079                  
Cumulative development $ 2,137                  
Cumulative number of reported claims | claim 11,266                  
2020 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 187,245 188,556 194,162 196,412 216,951 243,360        
Total of incurred but not reported liabilities plus expected development on reported claims 702                  
Cumulative development $ (56,115)                  
Cumulative number of reported claims | claim 34,792                  
2020 | Commercial workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 45,598 45,524 46,624 43,724 46,612 45,365        
Total of incurred but not reported liabilities plus expected development on reported claims (506)                  
Cumulative development $ 233                  
Cumulative number of reported claims | claim 7,453                  
2020 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 71,770 72,174 72,531 73,204 73,761 $ 81,206        
Total of incurred but not reported liabilities plus expected development on reported claims 326                  
Cumulative development $ (9,436)                  
Cumulative number of reported claims | claim 13,614                  
2021 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 175,956 176,770 162,879 162,359 145,822          
Total of incurred but not reported liabilities plus expected development on reported claims 43,852                  
Cumulative development $ 30,134                  
Cumulative number of reported claims | claim 6,492                  
2021 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 158,798 157,534 157,905 169,669 156,794          
Total of incurred but not reported liabilities plus expected development on reported claims (18,686)                  
Cumulative development $ 2,004                  
Cumulative number of reported claims | claim 14,678                  
2021 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 165,608 169,172 173,708 172,599 179,880          
Total of incurred but not reported liabilities plus expected development on reported claims 512                  
Cumulative development $ (14,272)                  
Cumulative number of reported claims | claim 24,254                  
2021 | Commercial workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 40,390 40,287 39,649 42,283 45,177          
Total of incurred but not reported liabilities plus expected development on reported claims 132                  
Cumulative development $ (4,787)                  
Cumulative number of reported claims | claim 4,599                  
2021 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 26,184 26,338 26,372 26,489 $ 28,537          
Total of incurred but not reported liabilities plus expected development on reported claims 130                  
Cumulative development $ (2,353)                  
Cumulative number of reported claims | claim 17,128                  
2022 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 189,588 181,924 175,579 161,826            
Total of incurred but not reported liabilities plus expected development on reported claims 42,104                  
Cumulative development $ 27,762                  
Cumulative number of reported claims | claim 3,590                  
2022 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 173,023 171,958 170,594 161,776            
Total of incurred but not reported liabilities plus expected development on reported claims 8,832                  
Cumulative development $ 11,247                  
Cumulative number of reported claims | claim 5,397                  
2022 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 155,585 160,303 161,672 157,165            
Total of incurred but not reported liabilities plus expected development on reported claims 5,790                  
Cumulative development $ (1,580)                  
Cumulative number of reported claims | claim 12,435                  
2022 | Commercial workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 27,743 27,398 26,721 29,597            
Total of incurred but not reported liabilities plus expected development on reported claims 1,379                  
Cumulative development $ (1,854)                  
Cumulative number of reported claims | claim 1,916                  
2022 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 3,056 3,127 2,287 $ 1,493            
Total of incurred but not reported liabilities plus expected development on reported claims 125                  
Cumulative development $ 1,563                  
Cumulative number of reported claims | claim 2,588                  
2023 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 178,568 173,529 172,398              
Total of incurred but not reported liabilities plus expected development on reported claims 65,882                  
Cumulative development $ 6,170                  
Cumulative number of reported claims | claim 3,209                  
2023 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 146,384 147,904 164,526              
Total of incurred but not reported liabilities plus expected development on reported claims 11,545                  
Cumulative development $ (18,142)                  
Cumulative number of reported claims | claim 4,457                  
2023 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 145,295 146,433 153,502              
Total of incurred but not reported liabilities plus expected development on reported claims 9,688                  
Cumulative development $ (8,207)                  
Cumulative number of reported claims | claim 10,472                  
2023 | Commercial workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 26,389 28,742 29,262              
Total of incurred but not reported liabilities plus expected development on reported claims 1,588                  
Cumulative development $ (2,873)                  
Cumulative number of reported claims | claim 1,508                  
2023 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 2,367 2,374 $ 2,391              
Total of incurred but not reported liabilities plus expected development on reported claims (2,842)                  
Cumulative development $ (24)                  
Cumulative number of reported claims | claim 63                  
2024 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 202,111 215,235                
Total of incurred but not reported liabilities plus expected development on reported claims 126,954                  
Cumulative development $ (13,124)                  
Cumulative number of reported claims | claim 2,588                  
2024 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 109,389 124,467                
Total of incurred but not reported liabilities plus expected development on reported claims 22,029                  
Cumulative development $ (15,078)                  
Cumulative number of reported claims | claim 4,115                  
2024 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 147,877 156,028                
Total of incurred but not reported liabilities plus expected development on reported claims 22,743                  
Cumulative development $ (8,151)                  
Cumulative number of reported claims | claim 11,270                  
2024 | Commercial workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 31,328 32,202                
Total of incurred but not reported liabilities plus expected development on reported claims 1,075                  
Cumulative development $ (874)                  
Cumulative number of reported claims | claim 1,764                  
2024 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 5,423 $ 8,648                
Total of incurred but not reported liabilities plus expected development on reported claims 1,282                  
Cumulative development $ (3,225)                  
Cumulative number of reported claims | claim 12                  
2025 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 228,026                  
Total of incurred but not reported liabilities plus expected development on reported claims $ 186,005                  
Cumulative number of reported claims | claim 1,451                  
2025 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 112,017                  
Total of incurred but not reported liabilities plus expected development on reported claims $ 41,229                  
Cumulative number of reported claims | claim 4,474                  
2025 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 172,715                  
Total of incurred but not reported liabilities plus expected development on reported claims $ 67,055                  
Cumulative number of reported claims | claim 14,725                  
2025 | Commercial workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 40,944                  
Total of incurred but not reported liabilities plus expected development on reported claims $ 6,816                  
Cumulative number of reported claims | claim 2,431                  
2025 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 11,200                  
Total of incurred but not reported liabilities plus expected development on reported claims $ 7,844                  
Cumulative number of reported claims | claim 4