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Loss And Loss Adjustment Expense Reserves - Incurred and Paid Claims (Details)
number_of_claims in Thousands, $ in Thousands
Dec. 31, 2024
USD ($)
number_of_claims
Dec. 31, 2023
USD ($)
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 ($)
Dec. 31, 2015
USD ($)
Claims Development [Line Items]                    
Net outstanding liabilities $ 2,970,466                  
Property insurance product line, automobile                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 19,250,950                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 17,016,160                  
All outstanding liabilities before 2015, net of reinsurance (560)                  
Net outstanding liabilities 2,234,230                  
Property insurance product line, homeowners'                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 4,379,142                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 3,956,100                  
All outstanding liabilities before 2015, net of reinsurance 1,179                  
Net outstanding liabilities 424,221                  
Property insurance product line, commercial property                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 657,501                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 444,640                  
All outstanding liabilities before 2015, net of reinsurance 205                  
Net outstanding liabilities 213,066                  
2015 | Property insurance product line, automobile                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 1,654,800 $ 1,655,267 $ 1,654,843 $ 1,653,878 $ 1,649,170 $ 1,645,950 $ 1,634,435 $ 1,610,839 $ 1,588,443 $ 1,551,105
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 335                  
Cumulative Number of Reported Claims | number_of_claims 170                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,654,360 1,654,069 1,651,465 1,643,443 1,634,780 1,614,188 1,560,480 1,466,368 1,336,223 1,040,253
2015 | Property insurance product line, homeowners'                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 237,701 237,994 237,872 240,927 239,941 238,652 236,855 233,501 234,881 234,800
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 60                  
Cumulative Number of Reported Claims | number_of_claims 24                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 237,468 237,651 236,983 236,143 235,971 234,683 230,480 224,178 213,994 163,196
2015 | Property insurance product line, commercial property                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 40,312 40,490 39,749 38,822 37,632 37,052 37,197 36,641 34,932 33,015
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 38                  
Cumulative Number of Reported Claims | number_of_claims 1                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 40,170 40,087 39,520 38,064 36,262 34,836 33,287 30,703 26,226 $ 17,110
2016 | Property insurance product line, automobile                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 1,744,803 1,745,513 1,743,417 1,740,807 1,732,410 1,731,997 1,713,696 1,669,642 1,672,853  
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 1,974                  
Cumulative Number of Reported Claims | number_of_claims 155                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,741,949 1,740,902 1,736,697 1,722,293 1,699,069 1,656,192 1,554,217 1,395,199 1,094,006  
2016 | Property insurance product line, homeowners'                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 260,179 259,701 259,722 259,984 260,496 259,708 259,497 259,489 250,691  
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 16                  
Cumulative Number of Reported Claims | number_of_claims 24                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 260,095 259,875 259,045 258,477 256,642 253,919 245,878 234,215 173,537  
2016 | Property insurance product line, commercial property                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 51,796 53,687 56,479 55,746 46,170 45,665 46,349 41,827 38,639  
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 158                  
Cumulative Number of Reported Claims | number_of_claims 1                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 50,579 49,190 48,036 46,026 41,221 39,499 35,426 27,210 $ 18,243  
2017 | Property insurance product line, automobile                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 1,753,163 1,754,356 1,755,702 1,748,289 1,733,425 1,741,825 1,727,277 1,703,857    
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 2,368                  
Cumulative Number of Reported Claims | number_of_claims 149                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,750,074 1,746,147 1,733,196 1,701,298 1,648,328 1,561,850 1,399,202 1,076,079    
2017 | Property insurance product line, homeowners'                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 291,804 290,909 291,360 289,294 289,869 288,322 295,163 309,491    
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 4                  
Cumulative Number of Reported Claims | number_of_claims 30                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 291,595 290,984 290,291 286,531 283,311 278,341 269,254 217,900    
2017 | Property insurance product line, commercial property                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 63,207 64,645 59,800 57,658 55,288 53,829 50,378 46,410    
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 1,312                  
Cumulative Number of Reported Claims | number_of_claims 1                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 60,980 60,803 52,350 47,597 43,809 36,284 31,116 $ 18,910    
2018 | Property insurance product line, automobile                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 1,814,240 1,811,302 1,807,297 1,806,240 1,785,071 1,773,502 1,781,817      
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 7,291                  
Cumulative Number of Reported Claims | number_of_claims 147                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,799,373 1,784,876 1,757,923 1,697,228 1,588,049 1,417,637 1,082,127      
2018 | Property insurance product line, homeowners'                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 306,857 308,345 306,347 305,292 310,695 308,361 311,798      
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 572                  
Cumulative Number of Reported Claims | number_of_claims 25                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 305,175 303,053 300,742 294,099 286,658 271,534 213,038      
2018 | Property insurance product line, commercial property                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 46,474 47,799 47,141 44,452 42,587 45,610 43,859      
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 849                  
Cumulative Number of Reported Claims | number_of_claims 1                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 43,527 41,376 37,428 34,520 29,436 24,146 $ 16,266      
2019 | Property insurance product line, automobile                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 1,948,995 1,951,924 1,954,151 1,959,262 1,911,268 1,916,269        
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 11,185                  
Cumulative Number of Reported Claims | number_of_claims 148                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,925,074 1,896,186 1,828,410 1,698,121 1,494,342 1,134,859        
2019 | Property insurance product line, homeowners'                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 362,401 360,140 360,609 361,421 366,139 359,643        
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 1,427                  
Cumulative Number of Reported Claims | number_of_claims 30                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 359,466 355,697 350,288 340,237 324,953 240,240        
2019 | Property insurance product line, commercial property                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 51,721 51,677 46,845 43,167 42,756 45,574        
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 1,744                  
Cumulative Number of Reported Claims | number_of_claims 1                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 45,886 40,056 35,780 30,592 25,956 $ 15,182        
2020 | Property insurance product line, automobile                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 1,419,119 1,430,973 1,452,343 1,448,083 1,514,551          
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 15,497                  
Cumulative Number of Reported Claims | number_of_claims 91                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,375,466 1,328,686 1,242,000 1,089,096 825,398          
2020 | Property insurance product line, homeowners'                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 411,127 411,408 413,882 411,404 420,257          
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 4,213                  
Cumulative Number of Reported Claims | number_of_claims 29                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 401,079 395,412 386,297 365,910 271,208          
2020 | Property insurance product line, commercial property                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 49,630 50,634 42,968 46,663 56,319          
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 3,732                  
Cumulative Number of Reported Claims | number_of_claims 1                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 40,713 37,130 31,138 27,705 $ 19,529          
2021 | Property insurance product line, automobile                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 1,834,183 1,854,319 1,879,751 1,811,064            
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 40,221                  
Cumulative Number of Reported Claims | number_of_claims 105                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,717,524 1,599,756 1,410,748 992,705            
2021 | Property insurance product line, homeowners'                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 501,214 504,086 511,311 510,724            
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 7,556                  
Cumulative Number of Reported Claims | number_of_claims 31                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 485,001 473,644 458,124 316,314            
2021 | Property insurance product line, commercial property                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 78,371 73,289 55,863 58,413            
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 15,537                  
Cumulative Number of Reported Claims | number_of_claims 1                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 54,763 41,432 33,477 $ 24,032            
2022 | Property insurance product line, automobile                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 2,262,432 2,264,193 2,255,032              
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 103,677                  
Cumulative Number of Reported Claims | number_of_claims 116                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,984,312 1,743,364 1,237,725              
2022 | Property insurance product line, homeowners'                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 567,123 562,562 578,489              
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 16,682                  
Cumulative Number of Reported Claims | number_of_claims 31                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 530,772 501,075 339,242              
2022 | Property insurance product line, commercial property                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 95,927 83,086 75,113              
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 22,328                  
Cumulative Number of Reported Claims | number_of_claims 1                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 58,455 44,304 $ 25,699              
2023 | Property insurance product line, automobile                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 2,398,449 2,349,659                
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 276,766                  
Cumulative Number of Reported Claims | number_of_claims 107                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,835,079 1,313,944                
2023 | Property insurance product line, homeowners'                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 709,918 717,988                
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 34,859                  
Cumulative Number of Reported Claims | number_of_claims 41                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 636,330 474,713                
2023 | Property insurance product line, commercial property                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 82,778 80,150                
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 31,451                  
Cumulative Number of Reported Claims | number_of_claims 1                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 32,384 $ 22,119                
2024 | Property insurance product line, automobile                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 2,420,766                  
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 791,846                  
Cumulative Number of Reported Claims | number_of_claims 91                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,232,949                  
2024 | Property insurance product line, homeowners'                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 730,818                  
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 161,375                  
Cumulative Number of Reported Claims | number_of_claims 29                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 449,119                  
2024 | Property insurance product line, commercial property                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 97,285                  
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 51,540                  
Cumulative Number of Reported Claims | number_of_claims 0                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 17,183