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General - Narrative (Details)
 3 Months Ended
Apr. 03, 2023
USD ($)
Mar. 31, 2023
USD ($)
ft²
Mar. 14, 2023
USD ($)
Mar. 31, 2023
USD ($)
ft²
$ / shares
shares
Mar. 31, 2022
USD ($)
$ / shares
shares
Dec. 31, 2022
USD ($)
Mar. 08, 2017
Organization, Consolidation and Presentation of Financial Statements [Line Items]              
Potentially dilutive securities (in shares) | shares       17,500      
Incremental shares excluded from diluted earnings per share (in shares) | shares         3,743    
Common stock dividends (in dollars per share) | $ / shares       $ 0.3175 $ 0.6350    
Policy acquisition costs       $ 164,507,000 $ 162,092,000    
Advertising expenses       1,900,000 3,900,000    
Net losses on sales of fixed assets       1,784,000 5,000    
Interest rate             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       $ 936,000,000      
Reinsurance policy, amount retained       60,000,000      
Ceded       23,000,000 17,000,000    
Losses and loss adjustment expenses, ceded       7,000,000 (7,000,000)    
Revenue from contract with customer       4,800,000 4,500,000    
Cost of goods and services sold       2,900,000 $ 2,800,000    
Contract with customer, liability   0   0   $ 0  
Contract with customer, asset   0   0   0  
Revenue, remaining performance obligation   $ 0   $ 0   0  
Promissory Note              
Organization, Consolidation and Presentation of Financial Statements [Line Items]              
Interest rate   7.00%   7.00%      
Promissory note, term (in years)       4 years      
Clearwater, Florida Office Building              
Organization, Consolidation and Presentation of Financial Statements [Line Items]              
Sale leaseback transaction, area of property leased back | ft²   14,883   14,883      
Sale leaseback transaction, percentage of property sold that has been leased back   9.00%          
Sale leaseback transaction, lease term (in years)   5 years          
Sale leaseback transaction, annual base rent   $ 395,000          
Clearwater, Florida 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           $ 20,200,000  
Net losses on sales of fixed assets       $ 1,800,000      
Clearwater, Florida 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   19,600,000   19,600,000      
Promissory note received from sale of fixed asset       9,800,000      
Sale price received in cash     $ 1,000,000        
Clearwater, Florida Office Building | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Subsequent Event              
Organization, Consolidation and Presentation of Financial Statements [Line Items]              
Sale price received in cash $ 7,500,000            
Ranch Cucamonga, 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   $ 13,600,000   $ 13,600,000