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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, 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
Dec. 31, 2012
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 $ 1,328,014                  
All outstanding liabilities before 2012, net of reinsurance 925                  
Liabilities for claims and claims adjustment expenses, net of reinsurance 101,429                  
Personal Automobile [Member] | 2012 [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 136,186 $ 136,165 $ 136,137 $ 135,132 $ 134,581 $ 133,428 $ 130,862 $ 124,652 $ 111,941 $ 87,517
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 132,300 132,215 131,642 131,326 130,026 125,946 120,118 109,051 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 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 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 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 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 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 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 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 76,477                  
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 631,850                  
All outstanding liabilities before 2012, net of reinsurance 118                  
Liabilities for claims and claims adjustment expenses, net of reinsurance 22,960                  
Homeowners [Member] | 2012 [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 54,560 54,553 54,557 54,557 54,356 54,317 54,298 54,028 53,619 46,566
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 50,955 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 57,339 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 62,936 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 63,217 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 78,454 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 81,464 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 70,416 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 60,348 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 52,161                  
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 512,718                  
All outstanding liabilities before 2012, net of reinsurance 46                  
Liabilities for claims and claims adjustment expenses, net of reinsurance 160,817                  
Commercial Automobile [Member] | 2012 [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 31,507 31,263 31,228 31,104 30,402 29,873 27,417 23,718 20,240 13,642
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 36,087 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 48,714 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 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 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 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 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 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 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 39,851                  
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 460,536                  
All outstanding liabilities before 2012, net of reinsurance 531                  
Liabilities for claims and claims adjustment expenses, net of reinsurance 157,594                  
Commercial Multi-Peril [Member] | 2012 [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 36,529 36,399 36,329 35,909 35,331 33,327 29,370 26,634 23,384 16,666
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 37,488 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 52,252 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 44,439 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 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 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 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 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 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 46,768                  
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 382,833                  
All outstanding liabilities before 2012, net of reinsurance 4,643                  
Liabilities for claims and claims adjustment expenses, net of reinsurance 113,779                  
Workers Compensation [Member] | 2012 [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 34,973 34,691 34,622 34,460 34,177 33,196 31,244 28,812 22,963 $ 11,097
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 41,209 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 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 39,096 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 41,543 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 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 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 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 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 $ 20,931