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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, 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
Dec. 31, 2013
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 $ 1,314,648                  
All outstanding liabilities before 2013, net of reinsurance 913                  
Liabilities for claims and claims adjustment expenses, net of reinsurance 97,163                  
Personal Automobile [Member] | 2013 [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 132,420 $ 132,300 $ 132,215 $ 131,642 $ 131,326 $ 130,026 $ 125,946 $ 120,118 $ 109,051 $ 84,241
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 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 141,172 140,892 140,028 139,121 135,027 128,395 116,303 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 155,521 154,769 153,521 151,159 143,321 129,507 102,433      
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 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 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 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 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 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 83,616                  
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 653,261                  
All outstanding liabilities before 2013, net of reinsurance 219                  
Liabilities for claims and claims adjustment expenses, net of reinsurance 25,905                  
Homeowners [Member] | 2013 [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 50,923 50,955 50,965 50,967 50,902 51,043 50,478 50,210 49,410 40,949
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 57,318 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 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 63,266 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 78,528 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 81,568 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 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 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 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 63,107                  
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 574,721                  
All outstanding liabilities before 2013, net of reinsurance 56                  
Liabilities for claims and claims adjustment expenses, net of reinsurance 162,683                  
Commercial Automobile [Member] | 2013 [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 36,081 36,087 36,092 36,106 36,004 34,083 31,053 26,879 23,557 16,306
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 48,757 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 53,052 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 65,076 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 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 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 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 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 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 46,242                  
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 529,231                  
All outstanding liabilities before 2013, net of reinsurance 699                  
Liabilities for claims and claims adjustment expenses, net of reinsurance 189,400                  
Commercial Multi-Peril [Member] | 2013 [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 37,575 37,488 37,436 37,333 36,321 35,104 33,614 29,159 26,216 19,875
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 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 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 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 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 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 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 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 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 57,641                  
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 409,139                  
All outstanding liabilities before 2013, net of reinsurance 4,843                  
Liabilities for claims and claims adjustment expenses, net of reinsurance 114,333                  
Workers Compensation [Member] | 2013 [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 41,599 41,209 40,827 40,361 39,617 38,877 36,351 32,783 26,043 $ 13,052
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 45,314 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 39,478 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 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 45,174 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 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 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 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 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 $ 18,643