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Reinsurance - Essent Guaranty's Excess of Loss Reinsurance Coverages and Retentions (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2025 USD ($)
Radnor Re, Total
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	$ 133,639,340
Remaining Risk in Force	36,880,250
Remaining Reinsurance in Force	1,141,069
Remaining First Layer Retention	1,387,350
Radnor Re 2021-1 Ltd. | Reinsurance Policy, Type [Axis]: Vintage Year Aug 2020 - Mar 2021
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	22,498,132
Remaining Risk in Force	6,194,669
Remaining Reinsurance in Force	165,266
Remaining First Layer Retention	277,360
Radnor Re 2021-2 Ltd. | Reinsurance Policy, Type [Axis]: Vintage Year Apr 2021 - Sep 2021
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	28,457,873
Remaining Risk in Force	7,936,192
Remaining Reinsurance in Force	248,077
Remaining First Layer Retention	274,846
Radnor Re 2022-1 Ltd. | Reinsurance Policy, Type [Axis]: Vintage Year Oct 2021 - Jul 2022
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	26,997,277
Remaining Risk in Force	7,409,659
Remaining Reinsurance in Force	160,941
Remaining First Layer Retention	298,719
Radnor Re 2023-1 Ltd. | Reinsurance Policy, Type [Axis]: Vintage Year August 2022- June 2023
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	27,368,762
Remaining Risk in Force	7,507,563
Remaining Reinsurance in Force	250,291
Remaining First Layer Retention	279,930
Radnor Re 2024-1 Ltd. | Reinsurance Policy, Type [Axis]: Vintage Year July 2023- July 2024
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	28,317,296
Remaining Risk in Force	7,832,167
Remaining Reinsurance in Force	316,494
Remaining First Layer Retention	256,495
OXL, Total
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	146,322,534
Remaining Risk in Force	40,107,494
Remaining Reinsurance in Force	341,920
Remaining First Layer Retention	1,645,563
XOL 2019-1 | Reinsurance Policy, Type [Axis]: Vintage Year Jan 2018 - Dec 2018
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	4,334,575
Remaining Risk in Force	1,143,163
Remaining Reinsurance in Force	76,144
Remaining First Layer Retention	243,099
XOL 2020-1 | Reinsurance Policy, Type [Axis]: Vintage Year Jan 2019 - Aug 2019
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	5,525,478
Remaining Risk in Force	1,461,723
Remaining Reinsurance in Force	29,152
Remaining First Layer Retention	211,464
XOL 2022-1 | Reinsurance Policy, Type [Axis]: Vintage Year Oct 2021 - Dec 2022
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	61,141,314
Remaining Risk in Force	16,718,151
Remaining Reinsurance in Force	141,992
Remaining First Layer Retention	494,068
XOL 2023-1 | Reinsurance Policy, Type [Axis]: Vintage Year Jan 2023 - Dec 2023
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	35,938,114
Remaining Risk in Force	9,967,019
Remaining Reinsurance in Force	36,627
Remaining First Layer Retention	365,476
XOL 2024-1 | Reinsurance Policy, Type [Axis]: Vintage Year Jan 2024 - Dec 2024
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	39,383,053
Remaining Risk in Force	10,817,438
Remaining Reinsurance in Force	58,005
Remaining First Layer Retention	$ 331,456

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