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Reinsurance - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2021
Effects of Reinsurance [Line Items]          
Ceded premiums $ 65,740,000 $ 41,096,000 $ 97,316,000 $ 71,820,000  
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%    
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 $ 4,400,000 $ 4,500,000 $ 9,100,000 $ 7,000,000  
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%