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Nature of Operations and Basis of Presentation (Details)				12 Months Ended
	Jan. 01, 2021	Dec. 31, 2020	Mar. 31, 2019	Dec. 31, 2024 state segment
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Number of reportable segments | segment				1
Affiliated Entity | Essent Guaranty
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Number of states in which the entity is licensed to write mortgage insurance | state				50
Affiliated Entity | Essent Re | Quota share reinsurance
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Reinsurance percentage	35.00%	25.00%
Affiliated Entity | Essent PA | Reinsurance for mortgage insurance coverage in excess of 25%
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Reinsurance for mortgage insurance coverage threshold (in excess of)			25.00%
Maximum
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Residential mortgage down payment percentage for which mortgage insurance is generally required (less than)				20.00%

X

- Definition

Financing Receivable Consumer Mortgage Insured Down Payment Percentage

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- Definition

Threshold percentage of risk reinsured on insurance products per entity policy.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 808
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479402/808-10-50-1

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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 47
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-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Publisher FASB
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- Definition

The number of states the entity operates in as of the balance sheet date.

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- Definition

Percentage of risk undertaken originally by insurer ceded to reinsurer.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
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