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Summary of Significant Accounting Policies - Insurance Premium Revenue Recognition (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Concentration Risk [Line Items]
Earned premiums from mortgage guaranty insurance monthly policies as a percentage of total earned premiums	93.00%
Threshold coverage period for single premium primary mortgage insurance policies (more than)	1 year
Unearned single premium recognized as earned upon notice of policy cancellation due to repayment of insured loan by borrower	$ 5.4	$ 6.3
One Lender | Total revenue | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	17.00%

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- Definition

Represents the earned premium during the period from mortgage guaranty insurance contracts which provide for monthly payments as a percentage of total earned premium.

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Represents, for single premium primary mortgage insurance policies with a nonrefundable premium, the total amount of unearned premium recognized as earned premium upon notification of cancellation due to repayment of the insured loan by the borrower.

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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.

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