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Unpaid Loss and Loss Adjustment Expense - Additional Information (Details) - USD ($)
1 Months Ended 6 Months Ended
Jul. 01, 2026
Jul. 01, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Effects of Reinsurance [Line Items]          
Favorable development on net loss and LAE reserves       $ (16,400,000) $ (12,600,000)
Current accident year incurred loss and LAE       $ 303,700,000 175,500,000
Reinsurance, excess retention, amount reinsured, per event   $ 10,000,000      
Reinsurance, per risk limit, amount   750,000      
Reinsurance Contract [Axis]: Excess of Loss Reinsurance Contract          
Effects of Reinsurance [Line Items]          
Reinsurance, excess retention, amount reinsured, per event   80,000,000      
Initial limit for each loss occurrence   50,000,000,000,000      
Reinsurance Contract [Axis]: Property Per Risk Excess of Loss Reinsurance          
Effects of Reinsurance [Line Items]          
Reinsurance, excess retention, amount reinsured, per policy   $ 2,250,000      
Reinsurance, excess retention, percentage   100.00%      
Reinsurance Contract [Axis]: Reinsurance Program          
Effects of Reinsurance [Line Items]          
Percent of contracts subject to participation through reinsurance   20.00%      
Subsequent event          
Effects of Reinsurance [Line Items]          
Percent of contracts subject to participation through reinsurance 18.00%        
Reinsurance, excess retention, amount reinsured, per event $ 100,000,000        
Initial limit for each loss occurrence 40,000,000        
Subsequent event | Reinsurance Contract [Axis]: Excess of Loss Reinsurance Contract          
Effects of Reinsurance [Line Items]          
Initial limit for each loss occurrence $ 50,000,000        
MIC Quota Share Reinsurance Contract          
Effects of Reinsurance [Line Items]          
Quota share reinsurance cession percentage   35.00%      
MIC Quota Share Reinsurance Contract | Subsequent event          
Effects of Reinsurance [Line Items]          
Quota share reinsurance cession percentage 40.00%        
LIC Quota Share Reinsurance Contract          
Effects of Reinsurance [Line Items]          
Quota share reinsurance cession percentage   15.00%      
LIC Quota Share Reinsurance Contract | Subsequent event          
Effects of Reinsurance [Line Items]          
Quota share reinsurance cession percentage 25.00%        
Maximum | Reinsurance Contract [Axis]: Property Per Risk Excess of Loss Reinsurance          
Effects of Reinsurance [Line Items]          
Reinsurance, excess retention, amount reinsured, per policy   $ 750,000      
California Wildfires          
Effects of Reinsurance [Line Items]          
Current accident year incurred loss and LAE         $ 16,900,000
Reduction in net unpaid losses     $ (4,200,000)