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Reinsurance - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Effects of Reinsurance [Line Items]        
Reinsurance recoverable on paid losses $ 203   $ 36,275  
Reinsurance recoverable on loss reserves 64,717 $ 102,901 66,905 $ 95,042
Ceded premiums $ 34,159 43,637    
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 Agreements        
Effects of Reinsurance [Line Items]        
Ceding commission, percentage (as a percent) 20.00%      
Reinsurance, Quota Share Reinsurance Agreement, Terms, Annual Loss Ratio Cap 300.00%      
Reinsurance, Quota Share Reinsurance Agreement, Terms, Lifetime Loss Ratio Cap 200.00%      
Threshold for private mortgage insurer eligibility requirements for termination election (less than) (as a percent) 90.00%      
Reinsurance recoverable on loss reserves $ 64,700   66,900  
Credit Union QSR        
Effects of Reinsurance [Line Items]        
Threshold for private mortgage insurer eligibility requirements for termination election (less than) (as a percent) 80.00%      
Quota Share Reinsurance Agreements, 2017 & 2018        
Effects of Reinsurance [Line Items]        
Reinsurance recoverable on paid losses     $ 36,000  
Excess of Loss Reinsurance Agreement, Home Re        
Effects of Reinsurance [Line Items]        
Ceded premiums $ 11,800 $ 10,300    
Excess of Loss Reinsurance Agreement, Home Re | Minimum        
Effects of Reinsurance [Line Items]        
Amortization period excess of loss reinsurance coverage 10 years      
Excess of Loss Reinsurance Agreement, Home Re | Maximum        
Effects of Reinsurance [Line Items]        
Amortization period excess of loss reinsurance coverage 12 years 6 months