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Reinsurance - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Mar. 31, 2021
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Effects of Reinsurance [Line Items]          
Ceded premiums   $ 47,173,000 $ 28,440,000 $ 144,489,000 $ 100,260,000
Quota Share Reinsurance Agreement, 2020          
Effects of Reinsurance [Line Items]          
Contingent termination fee       $ 0  
Threshold for private mortgage insurer eligibility requirements for termination election (less than) (as a percent)       90.00%  
Quota share for all policies covered (as a percent)       30.00%  
Cede rate, option 1 (as a percent)       25.00%  
Cede rate, option 2 (as a percent)       20.00%  
Ceding commission, percentage (as a percent)       20.00%  
Loss ratio threshold for profit commissions (as a percent)       62.00%  
Credit Union Quota Share Reinsurance Agreement          
Effects of Reinsurance [Line Items]          
Threshold for private mortgage insurer eligibility requirements for termination election (less than) (as a percent)       80.00%  
Quota share for all policies covered (as a percent)       65.00%  
Ceding commission, percentage (as a percent)       20.00%  
Loss ratio threshold for profit commissions (as a percent)       50.00%  
Quota Share Reinsurance Agreements, Excluding Captive Agreements          
Effects of Reinsurance [Line Items]          
Annual loss ratio cap under quota share reinsurance transactions (as a percent)       300.00%  
Lifetime loss ratio cap under quota share reinsurance transactions (as a percent)       200.00%  
Excess of Loss Reinsurance Agreement, Home Re          
Effects of Reinsurance [Line Items]          
Ceded premiums   $ 3,700,000 $ 5,400,000 $ 12,800,000 $ 12,400,000
Forecast | Quota Share Reinsurance Agreement, 2021          
Effects of Reinsurance [Line Items]          
Contingent termination fee $ 0        
Threshold for private mortgage insurer eligibility requirements for termination election (less than) (as a percent) 90.00%        
Quota share for all policies covered (as a percent) 17.50%        
Cede rate, option 1 (as a percent) 14.50%        
Cede rate, option 2 (as a percent) 12.00%        
Loss ratio threshold for profit commissions (as a percent) 62.00%        
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%