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Reinsurance - Essent Guaranty's Excess of Loss Reinsurance Coverages and Retentions (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2025 USD ($)
Radnor Re, Total
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	$ 127,822,754
Remaining Risk in Force	35,400,791
Remaining Reinsurance in Force	1,048,209
Remaining First Layer Retention	1,383,195
OXL, Total
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	141,472,015
Remaining Risk in Force	38,833,403
Remaining Reinsurance in Force	341,920
Remaining First Layer Retention	1,638,792
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	21,095,901
Remaining Risk in Force	5,826,753
Remaining Reinsurance in Force	139,755
Remaining First Layer Retention	277,158
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	26,046,456
Remaining Risk in Force	7,171,205
Remaining Reinsurance in Force	146,841
Remaining First Layer Retention	297,208
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	26,864,364
Remaining Risk in Force	7,566,871
Remaining Reinsurance in Force	228,819
Remaining First Layer Retention	273,926
Reinsurance Policy, Type [Axis]: Vintage Year August 2022- June 2023 | Radnor Re 2023-1 Ltd.
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	26,469,770
Remaining Risk in Force	7,268,636
Remaining Reinsurance in Force	235,647
Remaining First Layer Retention	278,466
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	4,124,729
Remaining Risk in Force	1,088,405
Remaining Reinsurance in Force	76,144
Remaining First Layer Retention	242,687
Reinsurance Policy, Type [Axis]: Vintage Year Jan 2019 - Aug 2019 | XOL 2020-1
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	5,279,113
Remaining Risk in Force	1,397,295
Remaining Reinsurance in Force	29,152
Remaining First Layer Retention	211,235
Reinsurance Policy, Type [Axis]: Vintage Year Jan 2023 - Dec 2023 | XOL 2023-1
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	34,703,053
Remaining Risk in Force	9,630,585
Remaining Reinsurance in Force	36,627
Remaining First Layer Retention	364,437
Reinsurance Policy, Type [Axis]: Vintage Year Jan 2024 - Dec 2024 | XOL 2024-1
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	38,318,310
Remaining Risk in Force	10,531,084
Remaining Reinsurance in Force	58,005
Remaining First Layer Retention	331,178
Reinsurance Policy, Type [Axis]: Vintage Year July 2023- July 2024 | Radnor Re 2024-1 Ltd.
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	27,346,263
Remaining Risk in Force	7,567,326
Remaining Reinsurance in Force	297,147
Remaining First Layer Retention	256,437
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	59,046,810
Remaining Risk in Force	16,186,034
Remaining Reinsurance in Force	141,992
Remaining First Layer Retention	$ 489,255

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