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Investments - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) security	Dec. 31, 2021 USD ($) security	Dec. 31, 2020 USD ($)
Debt Securities, Available-for-sale [Line Items]
Number of investment securities in unrealized loss position | security	2,578	1,180
Impairment loss	$ 12,728	$ 0	$ 429
Other invested assets	257,941	170,472
Income from other invested assets	28,676	56,386	(215)
Fair value of investments deposited with insurance regulatory authorities to meet statutory requirements	9,100	9,700
Essent Re
Debt Securities, Available-for-sale [Line Items]
Fair value of the required investments on deposit in trusts	972,400	982,600
Essent Guaranty
Debt Securities, Available-for-sale [Line Items]
Assets on deposit under reinsurance agreement	8,600	8,500
Assets on deposit for the benefit of the sponsor	9,100	$ 9,000
Limited Partnership Investment
Debt Securities, Available-for-sale [Line Items]
Other assets, fair value	165,700
Investment company, committed capital	$ 42,900
Limited Partnership Investment | Minimum
Debt Securities, Available-for-sale [Line Items]
Investment company, asset liquidation period	2 years
Limited Partnership Investment | Maximum
Debt Securities, Available-for-sale [Line Items]
Investment company, asset liquidation period	9 years
Limited Partnership Investment | Revision adjustment
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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