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Reinsurance - Essent Guaranty's Excess of Loss Reinsurance Coverages and Retentions (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2022 USD ($)
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	$ 211,316,119
Remaining Risk in Force	55,562,055
Remaining Reinsurance in Force	2,599,297
Remaining First Layer Retention	1,940,960
Reinsurance Contract [Axis]: Vintage Year 2015 And 2016
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	6,415,924
Remaining Risk in Force	1,740,167
Remaining Reinsurance in Force	61,478
Remaining First Layer Retention	206,925
Reinsurance Contract [Axis]: Vintage Year 2017
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	6,129,801
Remaining Risk in Force	1,610,026
Remaining Reinsurance in Force	369,893
Remaining First Layer Retention	216,632
Reinsurance Contract [Axis]: Vintage Year 2018
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	6,961,516
Remaining Risk in Force	1,791,216
Remaining Reinsurance in Force	401,681
Remaining First Layer Retention	248,875
Reinsurance Contract [Axis]: Vintage Year 2019
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	8,578,642
Remaining Risk in Force	2,203,474
Remaining Reinsurance in Force	498,675
Remaining First Layer Retention	214,874
Reinsurance Contract [Axis]: Vintage Year 2020 And 2021
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	43,021,732
Remaining Risk in Force	10,731,139
Remaining Reinsurance in Force	486,933
Remaining First Layer Retention	278,919
Reinsurance Contract [Axis]: Vintage Year 2021
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	42,367,258
Remaining Risk in Force	11,236,549
Remaining Reinsurance in Force	423,462
Remaining First Layer Retention	279,415
Reinsurance Contract [Axis]: Vintage Year 2021 And 2022 | Written From October 1 Through December 31, 2022
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	63,515,812
Remaining Risk in Force	17,043,854
Remaining Reinsurance in Force	119,307
Remaining First Layer Retention	426,096
Reinsurance Contract [Axis]: Vintage Year 2021 And 2022 | Written From October 1 Through July 31, 2022
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	34,325,434
Remaining Risk in Force	9,205,630
Remaining Reinsurance in Force	237,868
Remaining First Layer Retention	303,761
ILN 2015 & 2016 | Reinsurance Contract [Axis]: Vintage Year 2015 And 2016
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	61,478
Radnor Re 2018-1 Ltd. | Reinsurance Contract [Axis]: Vintage Year 2017
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	242,123
Radnor Re 2019-1 Ltd. | Reinsurance Contract [Axis]: Vintage Year 2018
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	325,537
Radnor Re 2020-1 Ltd. | Reinsurance Contract [Axis]: Vintage Year 2019
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	448,805
Radnor Re 2021-1 Ltd. | Reinsurance Contract [Axis]: Vintage Year 2020 And 2021
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	486,933
Radnor Re 2021-2 Ltd. | Reinsurance Contract [Axis]: Vintage Year 2021
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	423,462
Radnor Re 2021-2 Ltd. | Reinsurance Contract [Axis]: Vintage Year 2021 And 2022 | Written From October 1 Through December 31, 2022
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	0
Radnor Re 2021-2 Ltd. | Reinsurance Contract [Axis]: Vintage Year 2021 And 2022 | Written From October 1 Through July 31, 2022
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	237,868
ILN
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	2,226,206
Other Reinsurance
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	373,091
Other Reinsurance | Reinsurance Contract [Axis]: Vintage Year 2015 And 2016
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	0
Other Reinsurance | Reinsurance Contract [Axis]: Vintage Year 2017
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	127,770
Other Reinsurance | Reinsurance Contract [Axis]: Vintage Year 2018
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	76,144
Other Reinsurance | Reinsurance Contract [Axis]: Vintage Year 2019
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	49,870
Other Reinsurance | Reinsurance Contract [Axis]: Vintage Year 2020 And 2021
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	0
Other Reinsurance | Reinsurance Contract [Axis]: Vintage Year 2021
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	0
Other Reinsurance | Reinsurance Contract [Axis]: Vintage Year 2021 And 2022 | Written From October 1 Through December 31, 2022
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	119,307
Other Reinsurance | Reinsurance Contract [Axis]: Vintage Year 2021 And 2022 | Written From October 1 Through July 31, 2022
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	$ 0

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Amount per life of risk undertaken originally by insurer that is not ceded to reinsurer.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 20
-Section 50
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=99397103&loc=d3e6811-158387

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