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Reinsurance - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Effects of Reinsurance [Line Items]        
Reinsurance recoverable on loss reserves $ 39,200 $ 33,302 $ 32,761 $ 28,240
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%      
Reinsurance, quota reinsurance agreement, lifetime loss ratio cap (as a percent) 200.00%      
Threshold for private mortgage insurer eligibility requirements for termination election (less than) (as a percent) 90.00%      
Reinsurance recoverable on loss reserves $ 39,200 $ 33,300    
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%      
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 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%