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Reinsurance - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Effects of Reinsurance [Line Items]            
Reinsurance recoverable on loss reserves $ 111,153 $ 63,444 $ 111,153 $ 63,444 $ 95,042 $ 21,641
Ceded premiums $ 43,988 65,740 $ 87,625 97,316    
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%   300.00%      
Reinsurance, Quota Share Reinsurance Agreement, Terms, Lifetime Loss Ratio Cap 200.00%   200.00%      
Threshold for private mortgage insurer eligibility requirements for termination election (less than) (as a percent)     90.00%      
Reinsurance recoverable on loss reserves $ 111,200   $ 111,200   $ 95,000  
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%      
Excess of Loss Reinsurance Agreement, Home Re            
Effects of Reinsurance [Line Items]            
Ceded premiums $ 10,000 $ 4,400 $ 20,300 $ 9,100    
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      
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 | Minimum            
Effects of Reinsurance [Line Items]            
Term of mortgage insurance-linked notes     10 years      
Home Re special purpose insurers | Maximum            
Effects of Reinsurance [Line Items]            
Term of mortgage insurance-linked notes     12 years 6 months      
Financial Asset Equal To Or Greater Than 60 Days Past Due | Excess of Loss Reinsurance Agreement, Home Re            
Effects of Reinsurance [Line Items]            
Percent of delinquent reinsured loans to total reinsured loans     4.00%