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Liability for Losses and Loss Expenses, Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Personal Automobile [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 1,328,532                  
All outstanding liabilities before 2014, net of reinsurance 994                  
Liabilities for claims and claims adjustment expenses, net of reinsurance 104,457                  
Personal Automobile [Member] | 2014 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 127,026 $ 126,701 $ 125,762 $ 125,619 $ 124,926 $ 123,815 $ 120,491 $ 114,893 $ 104,736 $ 85,377
Personal Automobile [Member] | 2015 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 141,298 141,172 140,892 140,028 139,121 135,027 128,395 116,303 93,611  
Personal Automobile [Member] | 2016 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 155,505 155,521 154,769 153,521 151,159 143,321 129,507 102,433    
Personal Automobile [Member] | 2017 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 171,513 170,895 169,190 166,099 159,879 142,372 111,964      
Personal Automobile [Member] | 2018 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 176,233 173,922 169,651 163,036 150,175 115,585        
Personal Automobile [Member] | 2019 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 150,017 146,667 141,004 127,187 103,101          
Personal Automobile [Member] | 2020 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 94,094 89,736 81,783 66,084            
Personal Automobile [Member] | 2021 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 103,427 93,998 76,477              
Personal Automobile [Member] | 2022 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 109,845 83,616                
Personal Automobile [Member] | 2023 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 99,574                  
Homeowners [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 687,392                  
All outstanding liabilities before 2014, net of reinsurance 148                  
Liabilities for claims and claims adjustment expenses, net of reinsurance 25,294                  
Homeowners [Member] | 2014 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 57,327 57,318 57,339 57,336 57,243 56,995 57,195 56,990 56,255 45,823
Homeowners [Member] | 2015 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 63,042 62,938 62,936 62,943 62,844 62,590 62,204 61,542 51,885  
Homeowners [Member] | 2016 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 63,296 63,266 63,217 63,162 63,144 62,760 61,145 50,125    
Homeowners [Member] | 2017 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 78,556 78,528 78,454 78,127 78,006 77,663 67,077      
Homeowners [Member] | 2018 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 81,826 81,568 81,464 80,905 79,892 70,385        
Homeowners [Member] | 2019 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 71,209 70,884 70,416 69,145 58,074          
Homeowners [Member] | 2020 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 61,189 60,809 60,348 51,226            
Homeowners [Member] | 2021 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 64,124 63,920 52,161              
Homeowners [Member] | 2022 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 79,187 63,107                
Homeowners [Member] | 2023 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 67,636                  
Commercial Automobile [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 644,479                  
All outstanding liabilities before 2014, net of reinsurance 88                  
Liabilities for claims and claims adjustment expenses, net of reinsurance 157,172                  
Commercial Automobile [Member] | 2014 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 48,829 48,757 48,714 48,603 48,418 47,290 44,374 39,436 31,089 22,707
Commercial Automobile [Member] | 2015 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 53,047 53,052 52,728 51,992 51,605 48,261 41,678 35,342 23,875  
Commercial Automobile [Member] | 2016 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 65,273 65,076 64,421 60,485 57,237 48,837 38,237 27,033    
Commercial Automobile [Member] | 2017 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 64,074 62,187 59,889 57,128 49,703 40,213 28,707      
Commercial Automobile [Member] | 2018 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 79,308 74,421 69,487 57,451 47,941 33,862        
Commercial Automobile [Member] | 2019 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 80,617 72,139 63,575 53,026 36,948          
Commercial Automobile [Member] | 2020 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 70,669 60,665 46,459 31,884            
Commercial Automobile [Member] | 2021 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 69,908 56,101 39,851              
Commercial Automobile [Member] | 2022 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 67,367 46,242                
Commercial Automobile [Member] | 2023 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 45,387                  
Commercial Multi-Peril [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 608,761                  
All outstanding liabilities before 2014, net of reinsurance 521                  
Liabilities for claims and claims adjustment expenses, net of reinsurance 201,748                  
Commercial Multi-Peril [Member] | 2014 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 53,074 52,875 52,252 52,103 51,615 50,017 47,021 40,936 35,520 27,920
Commercial Multi-Peril [Member] | 2015 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 45,572 44,764 44,439 44,090 42,849 39,162 34,323 29,419 21,837  
Commercial Multi-Peril [Member] | 2016 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 48,048 47,432 44,944 43,435 41,193 34,612 29,402 19,660    
Commercial Multi-Peril [Member] | 2017 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 52,422 51,494 49,488 46,361 42,691 36,926 27,399      
Commercial Multi-Peril [Member] | 2018 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 62,253 59,118 54,913 48,050 42,296 30,597        
Commercial Multi-Peril [Member] | 2019 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 63,156 55,951 47,522 41,266 28,210          
Commercial Multi-Peril [Member] | 2020 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 58,754 52,646 46,193 34,729            
Commercial Multi-Peril [Member] | 2021 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 82,580 69,735 46,768              
Commercial Multi-Peril [Member] | 2022 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 86,664 57,641                
Commercial Multi-Peril [Member] | 2023 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 56,238                  
Workers Compensation [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 427,046                  
All outstanding liabilities before 2014, net of reinsurance 5,251                  
Liabilities for claims and claims adjustment expenses, net of reinsurance 113,124                  
Workers Compensation [Member] | 2014 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 45,905 45,314 44,671 44,403 43,866 42,465 40,393 36,284 28,513 $ 13,932
Workers Compensation [Member] | 2015 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 39,762 39,478 39,096 38,596 37,936 36,929 34,192 27,531 $ 13,071  
Workers Compensation [Member] | 2016 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 42,195 41,809 41,543 41,208 40,570 37,178 30,344 $ 14,709    
Workers Compensation [Member] | 2017 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 45,935 45,174 44,242 42,954 39,684 31,990 $ 15,581      
Workers Compensation [Member] | 2018 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 44,359 43,279 41,611 37,072 31,928 $ 17,644        
Workers Compensation [Member] | 2019 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 50,079 47,121 41,740 33,009 $ 16,939          
Workers Compensation [Member] | 2020 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 48,259 44,089 32,817 $ 14,591            
Workers Compensation [Member] | 2021 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 51,781 42,633 $ 20,931              
Workers Compensation [Member] | 2022 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 41,225 $ 18,643                
Workers Compensation [Member] | 2023 [Member]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 17,546