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Reinsurance - Narrative (Details) - USD ($)
3 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Mar. 31, 2018
Effects of Reinsurance [Line Items]      
Ceded premiums   $ 30,724,000 $ 33,265,000
Prior years   56,365,000 $ 81,983,000
Quota Share Reinsurance Agreement, 2019      
Effects of Reinsurance [Line Items]      
Contingent termination fee   $ 0  
Threshold for private mortgage insurer eligibility requirements for termination election (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 Agreement, 2015      
Effects of Reinsurance [Line Items]      
Quota share for all policies covered (as a percent)   30.00%  
Quota Share Reinsurance Agreement, 2015 | Forecast      
Effects of Reinsurance [Line Items]      
Quota share for all policies covered (as a percent) 15.00%    
Loss ratio threshold for profit commissions (as a percent) 68.00%    
Excess of Loss Reinsurance Agreement, Home Re      
Effects of Reinsurance [Line Items]      
Ceded premiums   $ 2,500,000