v3.26.1
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 ($)
claim
Jan. 01, 2026
Jan. 01, 2025
Jun. 30, 2026
USD ($)
claim
Dec. 31, 2025
USD ($)
Apr. 30, 2025
USD ($)
Jun. 30, 2027
USD ($)
Dec. 31, 2026
USD ($)
Jun. 30, 2026
USD ($)
Jun. 30, 2026
USD ($)
Dec. 31, 2025
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2025
USD ($)
Apr. 30, 2026
USD ($)
Apr. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Jun. 30, 2027
USD ($)
Dec. 31, 2026
Jun. 30, 2026
USD ($)
Dec. 31, 2025
Jun. 30, 2025
USD ($)
Jun. 30, 2025
USD ($)
Effects of Reinsurance [Line Items]                                            
Single risk coverage                   $ 9,000                        
Catastrophe coverage, multiple of per occurrence limitation | claim       2                                    
Catastrophe coverage, except for one occurrence limitation       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       52.00%                                    
Catastrophic coverage, top layer       $ 240,000                                    
Excess of catastrophic coverage, top layer       $ 200,000                                    
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                       400   $ 5,000 $ 4,500       250      
Underlying XOL treaty, excess of loss coverage excluded amount                       $ 600   5,000 $ 5,500       750      
Limited retention         $ 3,900 $ 5,200               $ 5,000                
Subsequent Event                                            
Effects of Reinsurance [Line Items]                                            
Single risk coverage $ 11,000                                          
Catastrophe coverage, multiple of per occurrence limitation | claim 2                                          
Catastrophe coverage, except for one occurrence limitation 70.00%                                          
Catastrophe coverage, one occurrence limitation 45.00%                                          
Catastrophic coverage, top layer $ 275,000                                          
Excess of catastrophic coverage, top layer 215,000                                          
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 | claim 168                                          
Minimum                                            
Effects of Reinsurance [Line Items]                                            
Direct loss                   3,500                        
Risk retention amount                                     $ 640      
Maximum                                            
Effects of Reinsurance [Line Items]                                            
Direct loss                   $ 9,000                        
Maximum | Subsequent Event                                            
Effects of Reinsurance [Line Items]                                            
Direct loss $ 11,000                                          
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             $ 5,250 4,750                            
Catastrophe loss coverage in excess of quota share coverage             $ 494,750 $ 495,250                            
Reinstatement premium protection             Yes Yes                            
Personal Lines:                                            
Effects of Reinsurance [Line Items]                                            
Quota share treaty percent ceded   5.00% 16.00%           5.00%   16.00%   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               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 10,250                            
in excess of 1             750 750                            
Total reinsurance coverage per occurrence             10,125 10,175                            
Losses per occurrence subject to reinsurance coverage             $ 11,000 $ 11,000                            
Quota share treaty percent excluded from percent ceded                                   5.00%