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Reinsurance - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Jul. 01, 2015
Mar. 31, 2017
Sep. 30, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Effects of Reinsurance [Line Items]              
Ceded premiums written, net of profit commission       $ 133,885,000 $ 55,391,000 $ 119,634,000  
Ceded to Other Companies       133,981,000 102,848,000 108,255,000  
Less reinsurance recoverable       $ 50,493,000 $ 44,487,000 57,841,000 $ 64,085,000
Period of existing captive reinsurance agreement       10 years 10 years    
Reinsurance recoverable on loss reserves related to captive agreements       $ 19,000,000 $ 34,000,000    
Fair value of trust fund assets under our captive agreements       91,000,000 137,000,000    
Quota Share Reinsurance Agreement, 2015              
Effects of Reinsurance [Line Items]              
Contingent termination fee $ 0            
Threshold for private mortgage insurer eligibility requirements for termination election 90.00%            
Quota share, percentage 30.00%            
Ceding commission, percentage 20.00%            
Loss ratio 60.00%            
Ceded premiums written, net of profit commission       125,460,000 52,588,000    
Ceded to Other Companies       125,460,000 52,588,000    
Ceding commission       47,629,000 20,582,000    
Profit commission       112,685,000 50,322,000    
Less reinsurance recoverable       $ 31,800,000 10,900,000    
Quota Share Reinsurance Agreement, 2013              
Effects of Reinsurance [Line Items]              
Ceded premiums written, net of profit commission     $ 69,400,000   (11,355,000) 100,031,000  
Ceded to Other Companies     11,600,000   35,999,000 88,528,000  
Ceding commission     $ 11,600,000   10,235,000 37,833,000  
Profit commission $ 142,500,000       $ 62,525,000 $ 89,133,000  
Quota Share Reinsurance Agreement, 2017 | Forecast              
Effects of Reinsurance [Line Items]              
Contingent termination fee   $ 0          
Threshold for private mortgage insurer eligibility requirements for termination election   90.00%          
Quota share, percentage   30.00%          
Ceding commission, percentage   20.00%          
Loss ratio   60.00%