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Dividends Restrictions (Details 2) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Equity        
Total equity $ 1,119,241,000 $ 955,738,000 $ 722,141,000 $ 219,123,000
Essent Re        
Equity        
Total equity 220,200,000      
Essent Re | Minimum | Essent Guaranty | Quota share reinsurance        
Equity        
Total equity $ 100,000,000