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Reinsurance - Excess of Loss Reinsurance (Details) - Mortgage Insurance	3 Months Ended
	Mar. 31, 2022
Other Reinsurance | Essent Guaranty
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Amortization period	10 years
VIE | Mortgage Insurance Linked Notes | Radnor Re
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Reinsurance retention policy, debt issued to cover insurance, term	10 years
VIE | Radnor Re
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Amortization period	10 years

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