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Statutory Accounting - Narrative (Details) - Affiliated Entity - USD ($) $ in Thousands		6 Months Ended
	Mar. 31, 2019	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Essent Guaranty
Dividends Restrictions
Increase (decrease) in contingency reserve		$ 71,600
Released contingency reserve		70,700	$ 43,200
Statutory net income		248,689	261,082
Essent Re
Dividends Restrictions
Statutory capital and surplus		1,700,000		$ 1,800,000
Statutory net income		$ 161,700	$ 170,500
Reinsurance for mortgage insurance coverage in excess of 25% | Essent PA
Dividends Restrictions
Reinsurance for mortgage insurance coverage threshold (in excess of)	25.00%

X

- Definition

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

+ References

No definition available.

+ Details

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- Definition

Represents the amount of increase (decrease) in contingency reserve.

+ References

No definition available.

+ Details

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- Definition

Statutory Accounting Practices, Release of Contingency Reserve

+ References

No definition available.

+ Details

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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/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(23)(c))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

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- Definition

The amount of statutory capital and surplus (stockholders' equity) as of the balance sheet date using prescribed or permitted statutory accounting practices (rather than GAAP, if different) of the state or country.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(23)(c))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 944
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477908/944-505-50-1

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- Definition

Amount of net income for the period determined using accounting principles prescribed or permitted by insurance regulators.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(23)(c))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

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