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Reinsurance - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Effects of Reinsurance [Line Items]                  
Reinsurance recoverable on loss reserves   $ 21,641,000       $ 21,641,000 $ 33,328,000 $ 48,474,000 $ 50,493,000
Ceded premiums earned           129,337,000 111,391,000 $ 125,735,000  
Quota Share Reinsurance Agreement, 2019                  
Effects of Reinsurance [Line Items]                  
Contingent termination fee           $ 0      
Threshold for private mortgage insurer eligibility requirements for termination election           90.00%      
Quota share, percentage           30.00%      
Cede rate, option 1           25.00%      
Cede rate, option 2           20.00%      
Ceding commission, percentage           20.00%      
Loss ratio           62.00%      
Quota Share Reinsurance Agreement, 2018                  
Effects of Reinsurance [Line Items]                  
Contingent termination fee           $ 0      
Threshold for private mortgage insurer eligibility requirements for termination election           90.00%      
Quota share, percentage           30.00%      
Ceding commission, percentage           20.00%      
Loss ratio           62.00%      
Quota Share Reinsurance Agreement, 2017                  
Effects of Reinsurance [Line Items]                  
Contingent termination fee           $ 0      
Threshold for private mortgage insurer eligibility requirements for termination election           90.00%      
Quota share, percentage           30.00%      
Ceding commission, percentage           20.00%      
Loss ratio           60.00%      
Quota Share Reinsurance Agreement, 2015                  
Effects of Reinsurance [Line Items]                  
Contingent termination fee $ 6,800,000 $ 0              
Threshold for private mortgage insurer eligibility requirements for termination election           90.00%      
Quota share, percentage   15.00% 30.00%            
Loss ratio           68.00%      
Quota Share Reinsurance Agreements, Excluding Captives                  
Effects of Reinsurance [Line Items]                  
Reinsurance recoverable on loss reserves   $ 21,600,000       $ 21,600,000 33,200,000    
Quota Share Reinsurance Agreement, 2020 | Forecast                  
Effects of Reinsurance [Line Items]                  
Contingent termination fee         $ 0        
Threshold for private mortgage insurer eligibility requirements for termination election         90.00%        
Quota share, percentage         30.00%        
Cede rate, option 1         25.00%        
Cede rate, option 2         20.00%        
Loss ratio         62.00%        
Quota Share Reinsurance Agreement, 2021 | Forecast                  
Effects of Reinsurance [Line Items]                  
Contingent termination fee       $ 0          
Threshold for private mortgage insurer eligibility requirements for termination election       90.00%          
Quota share, percentage       17.50%          
Cede rate, option 1       14.50%          
Cede rate, option 2       12.00%          
Loss ratio       62.00%          
Excess of Loss Reinsurance Agreements, Home Re Entities                  
Effects of Reinsurance [Line Items]                  
Amortization period excess of loss reinsurance coverage           10 years      
Ceded premiums earned           $ 17,600,000 $ 2,800,000    
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%      
Home Re special purpose insurers | Mortgage Insurance Linked Notes                  
Effects of Reinsurance [Line Items]                  
Term of mortgage insurance-linked notes           10 years