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Dividends Restrictions (Details) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Jan. 01, 2023
Dividends Restrictions        
Total equity $ 4,462,309,000 $ 4,236,114,000 $ 3,862,633,000  
Affiliated Entity        
Dividends Restrictions        
Dividends paid to parent company 0 0 55,000,000  
Essent Guaranty | Affiliated Entity        
Dividends Restrictions        
Unassigned surplus 314,700,000      
Dividends paid to parent company 315,000,000 247,200,000 0  
Essent Guaranty | Affiliated Entity | Subsequent Event        
Dividends Restrictions        
Amount available for dividend distribution       $ 314,700,000
Essent PA | Affiliated Entity        
Dividends Restrictions        
Unassigned surplus 13,600,000      
Dividends paid to parent company 5,000,000 $ 0 $ 0  
Essent PA | Affiliated Entity | Subsequent Event        
Dividends Restrictions        
Amount available for dividend distribution       $ 5,300,000
Essent Re | Affiliated Entity        
Dividends Restrictions        
Total equity 1,500,000,000      
Essent Re | Affiliated Entity | Minimum | Quota share reinsurance        
Dividends Restrictions        
Total equity $ 100,000,000