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Reinsurance - Essent Guaranty's Excess of Loss Reinsurance Coverages and Retentions (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($)
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	$ 206,065,438
Remaining Risk in Force	54,567,761
Remaining Reinsurance in Force	2,106,107
Remaining First Layer Retention	2,025,706
ILN
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	1,773,085
Other Reinsurance
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	333,022
Reinsurance Policy, Type [Axis]: Vintage Year 2017
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	5,511,131
Remaining Risk in Force	1,450,432
Remaining Reinsurance in Force	70,895
Remaining First Layer Retention	421,003
Reinsurance Policy, Type [Axis]: Vintage Year 2017 | Radnor Re 2018-1 Ltd.
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	0
Reinsurance Policy, Type [Axis]: Vintage Year 2017 | Other Reinsurance
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	70,895
Reinsurance Policy, Type [Axis]: Vintage Year 2018
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	6,349,474
Remaining Risk in Force	1,644,287
Remaining Reinsurance in Force	401,681
Remaining First Layer Retention	248,221
Reinsurance Policy, Type [Axis]: Vintage Year 2018 | Radnor Re 2019-1 Ltd.
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	325,537
Reinsurance Policy, Type [Axis]: Vintage Year 2018 | Other Reinsurance
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	76,144
Reinsurance Policy, Type [Axis]: Vintage Year 2019
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	7,859,217
Remaining Risk in Force	2,029,598
Remaining Reinsurance in Force	439,880
Remaining First Layer Retention	214,485
Reinsurance Policy, Type [Axis]: Vintage Year 2019 | Radnor Re 2020-1 Ltd.
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	395,889
Reinsurance Policy, Type [Axis]: Vintage Year 2019 | Other Reinsurance
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	43,991
Reinsurance Policy, Type [Axis]: Vintage Year 2020 And 2021
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	38,168,321
Remaining Risk in Force	9,652,777
Remaining Reinsurance in Force	414,005
Remaining First Layer Retention	278,909
Reinsurance Policy, Type [Axis]: Vintage Year 2020 And 2021 | Radnor Re 2021-1 Ltd.
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	414,005
Reinsurance Policy, Type [Axis]: Vintage Year 2020 And 2021 | Other Reinsurance
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	0
Reinsurance Policy, Type [Axis]: Vintage Year 2021
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	40,543,749
Remaining Risk in Force	10,825,130
Remaining Reinsurance in Force	399,786
Remaining First Layer Retention	279,400
Reinsurance Policy, Type [Axis]: Vintage Year 2021 | Radnor Re 2021-2 Ltd.
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	399,786
Reinsurance Policy, Type [Axis]: Vintage Year 2021 | Other Reinsurance
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	0
Reinsurance Policy, Type [Axis]: Vintage Year 2021 And 2022 | Coverage Period One
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	74,276,338
Remaining Risk in Force	19,998,840
Remaining Reinsurance in Force	141,992
Remaining First Layer Retention	507,114
Reinsurance Policy, Type [Axis]: Vintage Year 2021 And 2022 | Insurance Written Period
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Insurance in Force	33,357,208
Remaining Risk in Force	8,966,697
Remaining Reinsurance in Force	237,868
Remaining First Layer Retention	303,761
Reinsurance Policy, Type [Axis]: Vintage Year 2021 And 2022 | Radnor Re 2021-2 Ltd. | Coverage Period One
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	0
Reinsurance Policy, Type [Axis]: Vintage Year 2021 And 2022 | Radnor Re 2021-2 Ltd. | Insurance Written Period
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	237,868
Reinsurance Policy, Type [Axis]: Vintage Year 2021 And 2022 | Other Reinsurance | Coverage Period One
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	141,992
Reinsurance Policy, Type [Axis]: Vintage Year 2021 And 2022 | Other Reinsurance | Insurance Written Period
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Remaining Reinsurance in Force	$ 0

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- Definition

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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