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Summary of Significant Accounting Policies - Narrative (Details)
 12 Months Ended
Dec. 31, 2024
USD ($)
Subsidiary
State
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Summary Of Significant Accounting Policies [Line Items]      
Number of insurance companies | Subsidiary 12    
Number of states in which company operates | State 11    
Percentage of direct premiums written as private passenger automobile lines of insurance 61.00% 61.00% 61.00%
Percentage of private passenger automobile premiums written in California 84.00% 82.00% 82.00%
Other comprehensive income (loss) $ 0 $ 0 $ 0
Percentage of portfolio of unadjusted fair values obtained 98.40%    
Percentage by which dividend income on non redeemable preferred stock, partnership, common stock is partially tax-sheltered 50.00%    
Insurance companies security deposits $ 15,000,000 15,000,000  
Impairment charges 0 0 0
Goodwill and other intangible asset impairment 0 0  
Net premiums written 5,380,000,000 4,460,000,000 3,980,000,000
Reinsurance reimbursable amount $ 30,000,000    
Reinsurance retention policy, threshold loss ratio 73.50%    
Reinsurance policy, coverage per occurrence after retention limit $ 1,290,000,000    
Reinsurance policy, retention limit 150,000,000    
Ceded premiums earned 136,698,000 109,445,000 80,950,000
Losses and loss adjustment expenses, assumed and ceded $ (3,000,000) 10,000,000 (13,000,000)
Vesting term (in years) 4 years    
Revenue from contract with customer $ 25,200,000 20,800,000 18,200,000
Cost of goods and services sold 13,400,000 11,400,000 11,000,000.0
Commission income receivable 1,700,000 1,600,000  
Refund liability 1,100,000 1,000,000.0  
Contract with customer, asset 0 0  
Contract with customer, liability 0 0  
Revenue, remaining performance obligation 0 0  
Capitalized contract cost, net 0 200,000  
Capitalized contract cost, accumulated amortization 5,700,000 5,500,000  
Capitalized contract cost, amortization $ 200,000 900,000 $ 2,800,000
Software      
Summary Of Significant Accounting Policies [Line Items]      
Useful life (in years) 7 years    
Maximum | Building      
Summary Of Significant Accounting Policies [Line Items]      
Useful life (in years) 40 years    
Maximum | Furniture Equipment And Purchase Software      
Summary Of Significant Accounting Policies [Line Items]      
Useful life (in years) 7 years    
Minimum | Furniture Equipment And Purchase Software      
Summary Of Significant Accounting Policies [Line Items]      
Useful life (in years) 3 years    
Private Equity Funds      
Summary Of Significant Accounting Policies [Line Items]      
Unfunded commitments $ 5,000,000 $ 8,000,000