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Reinsurance - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Effects of Reinsurance [Line Items]        
Reinsurance recoverable on paid losses $ 4,197 $ 9,896    
Reinsurance recoverable on loss reserves $ 47,281 33,302 $ 28,240 $ 66,905
Most New Insurance Written In 2025 And 2026        
Effects of Reinsurance [Line Items]        
Quota Share % 40.00%      
Most New Insurance Written In 2025        
Effects of Reinsurance [Line Items]        
Annual Loss Ratio to Exhaust Profit Commission 63.00%      
Most New Insurance Written In 2026        
Effects of Reinsurance [Line Items]        
Annual Loss Ratio to Exhaust Profit Commission 62.00%      
Quota Share Reinsurance Transactions        
Effects of Reinsurance [Line Items]        
Ceding commission, percentage 20.00%      
Annual loss ratio cap, percentage 300.00%      
Lifetime loss ratio cap, percentage 200.00%      
Threshold for private mortgage insurer eligibility requirements for termination election 90.00%      
Reinsurance recoverable on loss reserves $ 47,300 33,300    
Credit Union QSR Transaction        
Effects of Reinsurance [Line Items]        
Quota Share % 65.00%      
Annual Loss Ratio to Exhaust Profit Commission 50.00%      
Threshold for private mortgage insurer eligibility requirements for termination election 80.00%      
2021 QSR Transaction        
Effects of Reinsurance [Line Items]        
Contingent termination fee $ 1,000      
Reinsurance recoverable on paid losses $ 2,700      
2020 QSR Transaction        
Effects of Reinsurance [Line Items]        
Contingent termination fee   5,100    
Reinsurance recoverable on paid losses   $ 9,400    
2019 QSR Transaction        
Effects of Reinsurance [Line Items]        
Contingent termination fee     2,200  
Quota Share Reinsurance Transactions, 2015 & 2019        
Effects of Reinsurance [Line Items]        
Reinsurance recoverable on paid losses     $ 17,700  
Home Re special purpose insurers        
Effects of Reinsurance [Line Items]        
Percent of total trust assets invested in cash or direct U.S. federal government obligations (as a percent) 99.50%