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Investments - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($) security	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) security	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($) security
Investments available for sale
Number of investment securities in an unrealized loss position | security	2,720		2,720		1,180
Impairment	$ 105	$ 0	$ 7,411	$ 0
Other invested assets	263,126		263,126		$ 170,472
Income from other invested assets	9,617	$ 40,741	36,275	$ 41,389
Fair value of investments deposited with insurance regulatory authorities	9,100		9,100		9,700
Net unrealized gains	9,900		22,500
Essent Re
Investments available for sale
Fair value of the required investments on deposit in trusts	1,000,000		1,000,000		982,600
Essent Guaranty
Investments available for sale
Assets on deposit under reinsurance agreement	8,600		8,600		8,500
Assets on deposit for the benefit of the sponsor	9,000		9,000		$ 9,000
Limited Partnership Investments
Investments available for sale
Other assets, fair value	$ 172,600		172,600
Funding commitments			$ 29,300
Limited Partnership Investments | Minimum
Investments available for sale
Asset liquidation period			2 years
Limited Partnership Investments | Maximum
Investments available for sale
Asset liquidation period			9 years
Securities | Credit Concentration Risk | Internal Investment Grade
Investments available for sale
Concentration risk, percentage			98.00%

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