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Reinsurance - Narrative (Details)
$ in Thousands
12 Months Ended
Oct. 01, 2020
USD ($)
Jul. 17, 2020
USD ($)
Jul. 01, 2020
USD ($)
reinstatement
May 01, 2020
USD ($)
reinstatement
Jan. 01, 2020
Jul. 01, 2019
Jan. 01, 2019
Dec. 31, 2019
Personal Auto                
Reinsurance Retention Policy                
Reinsurance - Percentage of Business Ceded         5.00% 10.00% 7.00%  
Quota share agreement, term           2 years    
Reinsurance percentage of ceding commission           31.20%    
Homeowners                
Reinsurance Retention Policy                
Reinsurance - Percentage of Business Ceded     20.00%     40.00%    
Quota share agreement, term     1 year     1 year    
Reinsurance percentage of ceding commission     37.00%     36.00%    
Property Catastrophe Program                
Reinsurance Retention Policy                
Amount of coverage in excess of retention       $ 650,000        
Number of reinstatements | reinstatement       1        
Casualty Program                
Reinsurance Retention Policy                
Amount of coverage in excess of retention $ 35,000              
Retention amount $ 5,000              
Minimum | Personal Auto                
Reinsurance Retention Policy                
Reinsurance percentage of ceding commission           30.00%    
Loss Ratio           64.70%    
Maximum | Personal Auto                
Reinsurance Retention Policy                
Reinsurance percentage of ceding commission           32.80%    
Loss Ratio           67.50%    
Reciprocal Exchanges | Personal lines                
Reinsurance Retention Policy                
Reinsurance - Percentage of Business Ceded     42.00%          
Quota share agreement, term     1 year         1 year
Reciprocal Exchanges | Personal lines, homeowners                
Reinsurance Retention Policy                
Reinsurance - Percentage of Business Ceded     55.00%         42.30%
Reciprocal Exchanges | Personal lines, auto                
Reinsurance Retention Policy                
Reinsurance - Percentage of Business Ceded     25.00%          
Reciprocal Exchanges | Property Catastrophe Program                
Reinsurance Retention Policy                
Amount of coverage in excess of retention     $ 475          
Number of reinstatements | reinstatement     1          
Retention amount     $ 20          
First Event | Property Catastrophe Program                
Reinsurance Retention Policy                
Retention amount   $ 50,000   $ 70,000        
Second Event | Property Catastrophe Program                
Reinsurance Retention Policy                
Retention amount       $ 50,000