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Reinsurance - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Effects of Reinsurance [Line Items]          
Reinsurance recoverable on paid losses   $ 18,081 $ 36,275    
Reinsurance recoverable on loss reserves   $ 28,240 66,905 $ 95,042 $ 21,641
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   $ 28,200 66,900    
Credit Union QSR Transaction          
Effects of Reinsurance [Line Items]          
Quota Share %   65.00%      
Annual loss ratio   50.00%      
Threshold for private mortgage insurer eligibility requirements for termination election   80.00%      
Quota Share Reinsurance Transaction, 2023 | Forecast          
Effects of Reinsurance [Line Items]          
Quota Share % 10.00%        
Annual loss ratio 58.50%        
2019 QSR Transaction          
Effects of Reinsurance [Line Items]          
Quota Share %   30.00%      
Annual loss ratio   62.00%      
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    
Reinsurance recoverable on paid losses     $ 36,000    
Aggregate Excess of Loss Reinsurance Transactions, Home Re Entities | Minimum          
Effects of Reinsurance [Line Items]          
Amortization period excess of loss reinsurance coverage   10 years      
Aggregate Excess of Loss Reinsurance Transactions, Home Re Entities | Maximum          
Effects of Reinsurance [Line Items]          
Amortization period excess of loss reinsurance coverage   12 years 6 months      
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%