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Reinsurance - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2023
Dec. 31, 2023
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2024
Dec. 31, 2022
Dec. 31, 2021
Effects of Reinsurance [Line Items]                  
Reinsurance recoverable on loss reserves     $ 40,934 $ 46,384 $ 40,934 $ 46,384   $ 28,240 $ 66,905
Ceded premiums     $ 50,164 $ 39,215 $ 141,842 $ 107,644      
Quota Share Reinsurance Transactions                  
Effects of Reinsurance [Line Items]                  
Ceding commission, percentage (as a percent)         20.00%        
Reinsurance, quote share reinsurance agreement, annual loss ratio cap (as a percent)     300.00%   300.00%        
Reinsurance, quota reinsurance agreement, lifetime loss ratio cap (as a percent)     200.00%   200.00%        
Threshold for private mortgage insurer eligibility requirements for termination election (less than) (as a percent)         90.00%        
Reinsurance recoverable on loss reserves     $ 40,900   $ 40,900     $ 28,200  
Credit Union QSR Transaction                  
Effects of Reinsurance [Line Items]                  
Threshold for private mortgage insurer eligibility requirements for termination election (less than) (as a percent)         80.00%        
Quota share for all policies covered (as a percent)         65.00%        
2020 QSR                  
Effects of Reinsurance [Line Items]                  
Quota share for all policies covered (as a percent)         12.50%        
2020 QSR | Forecast                  
Effects of Reinsurance [Line Items]                  
Contingent termination fee   $ 5,000              
2024 QSR Transaction | Forecast                  
Effects of Reinsurance [Line Items]                  
Quota share for all policies covered (as a percent)             30.00%    
Excess of Loss Reinsurance Transactions, Home Re Transactions                  
Effects of Reinsurance [Line Items]                  
Percent of reinsurance coverage threshold (as a percent)         10.00%        
Home Re 2019-1 | Subsequent Event                  
Effects of Reinsurance [Line Items]                  
Reduction to reinsurance agreements $ 187,100                
Home Re 2021-1 | Subsequent Event                  
Effects of Reinsurance [Line Items]                  
Reduction to reinsurance agreements 91,100                
Home Re 2021-2 | Subsequent Event                  
Effects of Reinsurance [Line Items]                  
Reduction to reinsurance agreements $ 106,700                
Home Re 2019-1 Ltd, Home Re 2021-1 Ltd, and Home Re-2021-2 Ltd | Forecast                  
Effects of Reinsurance [Line Items]                  
Ceded premiums   $ 8,000              
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         99.50%