Capital Maintenance Agreement	12 Months Ended
	Dec. 31, 2020
Insurance Ratios [Abstract]
Capital Maintenance Agreement	Capital Maintenance AgreementEssent Guaranty has a capital maintenance agreement with Essent PA under which Essent Guaranty agreed to contribute funds, under specified conditions, to maintain Essent PA's risk-to-capital ratio at or below 25.0 to 1 in return for a surplus note. As of December 31, 2020, Essent PA's risk-to-capital ratio was 1.7:1 and there were no amounts outstanding related to this agreement.