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Nature of Operations and Basis of Presentation (Details)
$ in Millions
6 Months Ended
Jul. 01, 2023
USD ($)
Jan. 01, 2021
Dec. 31, 2020
Mar. 31, 2019
Jun. 30, 2023
state
Boston National Title | Subsequent Event          
Insurance Premium Revenue Recognition          
Payments in cash | $ $ 92.6        
Affiliated Entity | 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   35.00% 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%