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Reinsurance - Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2021
Effects of Reinsurance [Line Items]      
Ceded premiums $ 31,576,000 $ 30,724,000  
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%    
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 $ 4,700,000 $ 2,500,000  
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%