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General - Narrative (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Line Items]          
Potentially dilutive securities (in shares) 0 17,500 0 17,500  
Common stock dividends (in dollars per share) $ 0.3175 $ 0.3175 $ 0.6350 $ 0.6350  
Policy acquisition costs $ 203,682,000 $ 172,737,000 $ 399,722,000 $ 337,245,000  
Advertising expenses 3,900,000 2,300,000 7,200,000 4,200,000  
Gain (loss) as a result of the held-for-sale classification     (6,145,000) 0  
Reinsurance reimbursable amount 30,000,000   $ 30,000,000    
Reinsurance retention policy, threshold loss ratio     73.50%    
Reinsurance retention policy, excess retention, amount reinsured     $ 1,290,000,000    
Reinsurance policy, amount retained     150,000,000    
Ceded premiums earned 31,400,000 24,000,000.0 62,500,000 47,200,000  
Losses and loss adjustment expenses, assumed and ceded (100,000) (3,400,000) (900,000) 4,100,000  
Revenue from contract with customer 6,000,000.0 5,000,000.0 11,700,000 9,800,000  
Cost of goods and services sold 3,200,000 $ 2,700,000 6,400,000 5,500,000  
Contract with customer, asset 0   0   $ 0
Contract with customer, liability 0   0   0
Revenue, remaining performance obligation 0   0   $ 0
Accrued interest receivable considered uncollectible or written off     0 $ 0  
Oklahoma City, Oklahoma Office Building | Disposal Group, Held-for-sale, Not Discontinued Operations          
Organization, Consolidation and Presentation of Financial Statements [Line Items]          
Fixed asset classified as held for sale 3,700,000   3,700,000    
Gain (loss) as a result of the held-for-sale classification (800,000)   (800,000)    
Folsom, California Office Building | Disposal Group, Held-for-sale, Not Discontinued Operations          
Organization, Consolidation and Presentation of Financial Statements [Line Items]          
Fixed asset classified as held for sale 10,000,000.0   10,000,000.0    
Gain (loss) as a result of the held-for-sale classification (5,400,000)   (5,400,000)    
Rancho Cucamonga, California Parcel Of Land | Disposal Group, Held-for-sale, Not Discontinued Operations          
Organization, Consolidation and Presentation of Financial Statements [Line Items]          
Fixed asset classified as held for sale 1,700,000   1,700,000    
Brea, California Office Building | Disposal Group, Held-for-sale, Not Discontinued Operations          
Organization, Consolidation and Presentation of Financial Statements [Line Items]          
Fixed asset classified as held for sale $ 10,500,000   $ 10,500,000