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Reinsurance - Essent Guaranty's Excess of Insurance Linked Note and Loss Reinsurance Coverages and Retentions (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2023 USD ($)
Radnor Re, Total
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	$ 121,193,654
Remaining Risk in Force	31,941,435
Remaining Reinsurance in Force	1,070,650
Remaining First Layer Retention	1,323,886
OXL, Total
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	91,699,119
Remaining Risk in Force	24,552,141
Remaining Reinsurance in Force	325,281
Remaining First Layer Retention	1,390,118
Reinsurance Policy, Type [Axis]: Vintage Year Aug 2020 - Mar 2021 | Radnor Re 2021-1 Ltd.
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	35,742,003
Remaining Risk in Force	9,110,919
Remaining Reinsurance in Force	374,172
Remaining First Layer Retention	278,827
Reinsurance Policy, Type [Axis]: Vintage Year Oct 2021 - Jul 2022 | Radnor Re 2022-1 Ltd.
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	32,744,576
Remaining Risk in Force	8,818,357
Remaining Reinsurance in Force	237,868
Remaining First Layer Retention	303,761
Reinsurance Policy, Type [Axis]: Vintage Year Apr 2021 - Sep 2021 | Radnor Re 2021-2 Ltd.
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	39,179,542
Remaining Risk in Force	10,503,842
Remaining Reinsurance in Force	384,452
Remaining First Layer Retention	279,297
Reinsurance Policy, Type [Axis]: Vintage Year Jan 2017 - Dec 2017 | XOL 2018-1
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	5,200,346
Remaining Risk in Force	1,369,342
Remaining Reinsurance in Force	65,983
Remaining First Layer Retention	421,003
Reinsurance Policy, Type [Axis]: Vintage Year Jan 2018 - Dec 2018 | Radnor Re 2019-1 Ltd.
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	6,031,462
Remaining Risk in Force	1,568,566
Remaining Reinsurance in Force	21,467
Remaining First Layer Retention	247,780
Reinsurance Policy, Type [Axis]: Vintage Year Jan 2018 - Dec 2018 | XOL 2019-1
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	6,031,462
Remaining Risk in Force	1,568,566
Remaining Reinsurance in Force	76,144
Remaining First Layer Retention	247,780
Reinsurance Policy, Type [Axis]: Vintage Year Jan 2019 - Dec 2019 | Radnor Re 2020-1 Ltd.
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	7,496,071
Remaining Risk in Force	1,939,751
Remaining Reinsurance in Force	52,691
Remaining First Layer Retention	214,221
Reinsurance Policy, Type [Axis]: Vintage Year Jan 2019 - Dec 2019 | XOL 2020-1
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	7,496,071
Remaining Risk in Force	1,939,751
Remaining Reinsurance in Force	41,162
Remaining First Layer Retention	214,221
Reinsurance Policy, Type [Axis]: Vintage Year Oct 2021 - Dec 2022 | XOL 2022-1
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	72,971,240
Remaining Risk in Force	19,674,482
Remaining Reinsurance in Force	141,992
Remaining First Layer Retention	$ 507,114

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