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Nature of Operations and Basis of Presentation (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
state
Sep. 30, 2017
USD ($)
Insurance Premium Revenue Recognition    
Repayment of borrowings with term loan proceeds (see Note 6) | $ $ 100,000 $ 125,000
Essent Guaranty    
Insurance Premium Revenue Recognition    
Number of states in which the entity is licensed to write mortgage insurance | state 50  
Affiliated Entity | Essent Re | Quota share reinsurance    
Insurance Premium Revenue Recognition    
Reinsurance percentage 25.00%  
Affiliated Entity | Essent PA | Reinsurance for mortgage insurance coverage in excess of 25%    
Insurance Premium Revenue Recognition    
Reinsurance for mortgage insurance coverage threshold (in excess of) 25.00%  
Maximum    
Insurance Premium Revenue Recognition    
Residential mortgage down payment percentage for which mortgage insurance is generally required (less than) 20.00%  
Total revenue | Customer concentration | One lender    
Customer concentration    
Concentration risk, percentage 10.00%