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Reinsurance - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 31, 2023
Dec. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Effects of Reinsurance [Line Items]            
Reinsurance recoverable on paid losses   $ 9,896 $ 9,896 $ 18,081    
Reinsurance recoverable on loss reserves   $ 33,302 33,302 28,240 $ 66,905 $ 95,042
Ceded premiums earned     $ 202,821 156,373 163,031  
Quota Share Reinsurance Transactions            
Effects of Reinsurance [Line Items]            
Ceding commission, percentage     20.00%      
Annual loss ratio cap, percentage   300.00% 300.00%      
Lifetime loss ratio cap, percentage   200.00% 200.00%      
Threshold for private mortgage insurer eligibility requirements for termination election     90.00%      
Reinsurance recoverable on loss reserves   $ 33,300 $ 33,300 28,200    
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%      
2020 QSR            
Effects of Reinsurance [Line Items]            
Quota Share %     12.50%      
Annual Loss Ratio to Exhaust Profit Commission     62.00%      
Contingent termination fee     $ 5,100      
Reinsurance recoverable on paid losses   9,400 $ 9,400      
2020 QSR and 2021 QSR - 2020 NIW            
Effects of Reinsurance [Line Items]            
Quota Share %     17.50%      
Annual Loss Ratio to Exhaust Profit Commission     62.00%      
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    
Quota Share Reinsurance Transactions, 2017 & 2018            
Effects of Reinsurance [Line Items]            
Contingent termination fee         $ 5,000  
Home Re 2019-1, Home Re 2021-1 and Home Re 2021-2            
Effects of Reinsurance [Line Items]            
Ceded premiums earned   $ 8,000        
Excess of Loss Reinsurance Transactions, Home Re Transactions            
Effects of Reinsurance [Line Items]            
Reinsurance Agreement, Optional Right, Percent Of Reinsurance Coverage Threshold     10.00%      
Home Re 2019-1            
Effects of Reinsurance [Line Items]            
Reinsurance Retention Policy, Reduction in Insurance Linked Notes $ 187,100          
Home Re 2021-1            
Effects of Reinsurance [Line Items]            
Reinsurance Retention Policy, Reduction in Insurance Linked Notes 91,100          
Home Re 2021-2            
Effects of Reinsurance [Line Items]            
Reinsurance Retention Policy, Reduction in Insurance Linked Notes $ 106,700          
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%