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Dividend Restrictions (Details) - USD ($)
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Dividends Restrictions      
Stockholders' equity $ 4,215,068,000 $ 3,920,937,000 $ 4,236,114,000
Affiliated Entity | Essent Guaranty      
Dividends Restrictions      
Amount available for dividend distribution 376,700,000    
Unassigned surplus 376,700,000    
Dividends paid to parent company 100,000,000 0  
Affiliated Entity | Essent PA      
Dividends Restrictions      
Amount available for dividend distribution 5,600,000    
Unassigned surplus 17,900,000    
Dividends paid to parent company 0 $ 0  
Affiliated Entity | Essent Re      
Dividends Restrictions      
Stockholders' equity 1,300,000,000    
Affiliated Entity | Essent Re | Quota share reinsurance | Minimum      
Dividends Restrictions      
Stockholders' equity $ 100,000,000