v3.26.3
Property and Casualty Insurance Activity - Schedule of Material Terms for Reinsurance Treaties (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 4 Months Ended 6 Months Ended 7 Months Ended 9 Months Ended 12 Months Ended 18 Months Ended
Jul. 01, 2026
USD ($)
claim
consecutiveHour
Jan. 01, 2026
Jul. 01, 2025
USD ($)
Jan. 01, 2025
Jun. 30, 2026
USD ($)
claim
Mar. 31, 2027
Mar. 31, 2026
Dec. 31, 2025
USD ($)
Apr. 30, 2025
USD ($)
Dec. 31, 2026
USD ($)
Jun. 30, 2026
USD ($)
Dec. 31, 2025
USD ($)
Jun. 30, 2025
USD ($)
Apr. 30, 2026
USD ($)
Apr. 30, 2025
USD ($)
Sep. 30, 2026
USD ($)
Sep. 30, 2024
USD ($)
Jun. 30, 2027
USD ($)
Dec. 31, 2026
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2025
USD ($)
Effects of Reinsurance [Line Items]                                            
Single risk coverage $ 11,000                             $ 9,000            
Catastrophe coverage, multiple of per occurrence limitation | claim 2       2                                  
Catastrophe coverage, except for one occurrence limitation 70.00%       80.00%                                  
Catastrophic coverage, first layer         $ 5,000                             $ 5,000    
Excess of catastrophic coverage, first layer         $ 5,000                             5,000    
Catastrophe coverage, one occurrence limitation 45.00%       52.00%                                  
Catastrophic coverage, top layer $ 275,000       $ 240,000                                  
Excess of catastrophic coverage, top layer 215,000       $ 200,000                                  
Catastrophe, first layer coverage, perils excluding storms 5,000                                          
Excess of catastrophic coverage, first layer, perils excluding storms $ 5,000                                          
Catastrophe coverage, for storms occurrence limitation 95.00%                                          
Catastrophe, first layer coverage, for storms $ 5,000                                          
Excess of catastrophic coverage, first layer, for storms $ 5,000                                          
Catastrophe coverage, number of consecutive hours | consecutiveHour 168                                          
Reinstatement of premium protection, catastrophe coverage                             $ 4,500         50,000 $ 50,000  
Excess of catastrophe coverage                             $ 5,500         $ 10,000 $ 10,000  
Underlying XOL treaty, reinsurance coverage (percent)                         50.00% 90.00% 71.00%         50.00%   50.00%
Reinstatement of premium protection                                           $ 400
Reinstatement of premium protection, excluded amount                                           600
Risk retention amount                       $ 640 $ 530       $ 730     $ 825   $ 530
Underlying XOL treaty, reinsurance coverage, layer one (percent)                                       50.00%    
Reinstatement of premium protection, layer one                                       $ 250    
Reinstatement of premium protection, layer one, excluded amount                                       $ 750    
Underlying XOL treaty, reinsurance coverage, layer two (percent)                                       100.00%    
Reinstatement of premium protection, layer two, excluded amount                                       $ 1,000    
Reinstatement of premium protection, layer two                                       $ 9,000    
Catastrophe, first layer coverage (percent)                                       80.00%    
Catastrophe coverage, remaining (in percent)                                       100.00%    
Catastrophe coverage, remaining layer                                       $ 430,000    
Excess of catastrophe coverage, remaining                                       10,000    
Catastrophe reinsurance coverage, (percent)                             71.00%              
Underlying XOL treaty, excess of loss coverage amount $ 495,000   $ 435,000                   400 $ 5,000 $ 4,500         250    
Underlying XOL treaty, excess of loss coverage excluded amount 5,000   $ 5,000                   600 5,000 $ 5,500         750    
Limited retention               $ 3,900 $ 5,200         $ 5,000                
Minimum                                            
Effects of Reinsurance [Line Items]                                            
Direct loss                               3,500            
Risk retention amount                                       $ 640    
Maximum                                            
Effects of Reinsurance [Line Items]                                            
Direct loss $ 11,000                             $ 9,000            
Forecast                                            
Effects of Reinsurance [Line Items]                                            
Catastrophic coverage, first layer                                   $ 5,000        
Excess of catastrophic coverage, first layer                                   5,000        
Reinstatement of premium protection, catastrophe coverage                                   50,000        
Excess of catastrophe coverage                                   $ 10,000        
Underlying XOL treaty, reinsurance coverage (percent)                                   50.00%        
Underlying XOL treaty, reinsurance coverage, layer one (percent)                                   50.00%        
Reinstatement of premium protection, layer one                                   $ 250        
Reinstatement of premium protection, layer one, excluded amount                                   $ 750        
Underlying XOL treaty, reinsurance coverage, layer two (percent)                                   100.00%        
Reinstatement of premium protection, layer two, excluded amount                                   $ 1,000        
Reinstatement of premium protection, layer two                                   $ 11,000        
Catastrophe, first layer coverage (percent)                                   95.00%        
Catastrophe coverage, remaining (in percent)                                   100.00%        
Catastrophe coverage, remaining layer                                   $ 490,000        
Underlying XOL treaty, excess of loss coverage amount                                   250        
Underlying XOL treaty, excess of loss coverage excluded amount                                   $ 750        
Other catastrophe risks                                   70.00%        
Forecast | Maximum                                            
Effects of Reinsurance [Line Items]                                            
Risk retention amount                                   $ 715        
Catastrophe Reinsurance:                                            
Effects of Reinsurance [Line Items]                                            
Initial loss subject to personal lines quota share treaty                     $ 10,000 10,000 10,000                  
Risk retained per catastrophe occurrence                     5,500 5,000 4,250                  
Catastrophe loss coverage in excess of quota share coverage                     $ 434,500 $ 435,000 $ 275,000                  
Reinstatement premium protection                     Yes Yes Yes                  
Catastrophe Reinsurance: | Forecast                                            
Effects of Reinsurance [Line Items]                                            
Initial loss subject to personal lines quota share treaty                   $ 10,000                        
Risk retained per catastrophe occurrence                   4,750                        
Catastrophe loss coverage in excess of quota share coverage                   $ 495,250                        
Reinstatement premium protection                   Yes                        
Personal Lines:                                            
Effects of Reinsurance [Line Items]                                            
Quota share treaty percent ceded   5.00%   16.00%     16.00%       5.00% 16.00% 16.00%                  
Risk retained on initial $1,000,000 of losses                     $ 950 $ 840 $ 840                  
Losses per occurrence subject to quota share reinsurance coverage                     1,000 1,000 1,000                  
Excess of loss coverage and facultative facility coverage                     8,250 8,250 8,400                  
in excess of 1                     750 750 600                  
Total reinsurance coverage per occurrence                     8,175 8,285 8,360                  
Losses per occurrence subject to reinsurance coverage                     $ 9,000 $ 9,000 $ 9,000                  
Quota share treaty percent excluded from percent ceded             6.00%                              
Personal Lines: | Forecast                                            
Effects of Reinsurance [Line Items]                                            
Quota share treaty percent ceded           30.00%       5.00%                 30.00%      
Risk retained on initial $1,000,000 of losses                   $ 950                        
Losses per occurrence subject to quota share reinsurance coverage                   1,000                        
Excess of loss coverage and facultative facility coverage                   10,250                        
in excess of 1                   750                        
Total reinsurance coverage per occurrence                   10,175                        
Losses per occurrence subject to reinsurance coverage                   $ 11,000                        
Quota share treaty percent excluded from percent ceded           5.00%