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General - Narrative (Details)
 1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2023
Sep. 30, 2024
USD ($)
ft²
$ / shares
shares
Sep. 30, 2023
USD ($)
$ / shares
shares
Sep. 30, 2024
USD ($)
ft²
$ / shares
shares
Sep. 30, 2023
USD ($)
$ / shares
shares
Dec. 31, 2023
USD ($)
Mar. 08, 2017
Organization, Consolidation and Presentation of Financial Statements [Line Items]              
Potentially dilutive securities (in shares) | shares   0 17,500 0 17,500    
Common stock dividends (in dollars per share) | $ / shares   $ 0.3175 $ 0.3175 $ 0.9525 $ 0.9525    
Policy acquisition costs   $ 230,293,000 $ 181,569,000 $ 630,016,000 $ 518,813,000    
Advertising expenses   6,500,000 2,400,000 13,800,000 6,600,000    
Gain (loss) as a result of the held-for-sale classification       (6,420,000) 0    
Gain (loss) on sale of fixed asset       20,113,000 5,857,000    
Sale price received in cash       12,707,000 29,860,000    
Interest rate (in percent)             4.40%
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   42,400,000 30,900,000 104,900,000 78,100,000    
Losses and loss adjustment expenses, assumed and ceded   (1,500,000) (300,000) (2,500,000) 3,800,000    
Revenue from contract with customer   6,400,000 5,200,000 18,000,000.0 15,000,000.0    
Cost of goods and services sold   3,200,000 2,700,000 9,600,000 8,200,000    
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    
Promissory Note              
Organization, Consolidation and Presentation of Financial Statements [Line Items]              
Interest rate (in percent) 7.00% 7.00%   7.00%      
Promissory note, term (in years) 4 years     4 years      
Oklahoma City, Oklahoma Office Building              
Organization, Consolidation and Presentation of Financial Statements [Line Items]              
Sale leaseback transaction, area of property leased back | ft²   5,000   5,000      
Sale leaseback transaction, percentage of property sold that has been leased back       5.00%      
Sale leaseback transaction, monthly base rent       $ 8,000      
Oklahoma City, Oklahoma Office Building | Disposal Group, Disposed of by Sale, Not Discontinued Operations              
Organization, Consolidation and Presentation of Financial Statements [Line Items]              
Sale price of fixed asset   $ 3,600,000   3,600,000      
Gain (loss) on sale of fixed asset   (100,000)   (100,000)      
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   3,400,000   3,400,000      
Gain (loss) as a result of the held-for-sale classification   (300,000)   (1,000,000.0)      
Brea, California Office Building | Disposal Group, Disposed of by Sale, Not Discontinued Operations              
Organization, Consolidation and Presentation of Financial Statements [Line Items]              
Sale price of fixed asset   31,500,000   31,500,000      
Gain (loss) on sale of fixed asset   20,300,000   20,300,000      
Promissory note received from sale of fixed asset       21,400,000      
Sale price received in cash       9,300,000      
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    
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)      
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