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Reinsurance - Narrative (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Dec. 31, 2020
Effects of Reinsurance [Line Items]        
Reinsurance recoverable on paid losses $ 214 $ 36,275    
Reinsurance recoverable on loss reserves 46,384 66,905 $ 107,029 $ 95,042
Reinsurance Coverage, Traditional XOL Transaction        
Effects of Reinsurance [Line Items]        
Excess of loss reinsurance coverage $ 175,000      
Approximate contractual termination term 10 years      
Optional termination term 7 years      
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%      
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 $ 46,400 66,900    
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%      
QSR Transactions, 2017 & 2018        
Effects of Reinsurance [Line Items]        
Reinsurance recoverable on paid losses   $ 36,000    
Aggregate Excess of Loss Reinsurance Transactions, Home Re | Minimum        
Effects of Reinsurance [Line Items]        
Amortization period excess of loss reinsurance coverage 10 years      
Aggregate Excess of Loss Reinsurance Transactions, Home Re | Maximum        
Effects of Reinsurance [Line Items]        
Amortization period excess of loss reinsurance coverage 12 years 6 months