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Investments - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) security	Dec. 31, 2022 USD ($) security	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Debt Securities, Available-for-sale [Line Items]
Number of investment securities in unrealized loss position | security	2,256	2,578
Impairment loss	$ 177	$ 12,728	$ 0
Other invested assets	277,226	257,941
Income from other invested assets	(11,118)	28,676	$ 56,386
Fair value of investments deposited with insurance regulatory authorities to meet statutory requirements	9,200	9,100
Limited Partnership Investment
Debt Securities, Available-for-sale [Line Items]
Other assets, fair value	137,800
Investment company, committed capital	47,700
Essent Re
Debt Securities, Available-for-sale [Line Items]
Fair value of the required investments on deposit in trusts	1,060,000	972,400
Essent Guaranty
Debt Securities, Available-for-sale [Line Items]
Assets on deposit under reinsurance agreement	5,100	8,600
Assets on deposit for the benefit of the sponsor	$ 9,200	$ 9,100
Minimum | Limited Partnership Investment
Debt Securities, Available-for-sale [Line Items]
Investment company, asset liquidation period	2 years
Maximum | Limited Partnership Investment
Debt Securities, Available-for-sale [Line Items]
Investment company, asset liquidation period	9 years
Revision adjustment | Limited Partnership Investment
Debt Securities, Available-for-sale [Line Items]
Income from other invested assets				$ 7,600
Securities | Credit Concentration Risk | Internal Investment Grade
Debt Securities, Available-for-sale [Line Items]
Concentration risk, percentage	98.00%

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