Losses and LAE - Schedule of Cumulative Paid Claims / Reconciliation of Outstanding Liabilities (Parenthetical) (Details) $ in Thousands	Dec. 31, 2024 USD ($)
All outstanding liabilities before 2015, net of reinsurance
Short-Duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Cumulative paid claims, net of reinsurance	$ 7,411
Mortgage insurance
Short-Duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Incurred losses, net of reinsurance	874,819
Cumulative paid claims, net of reinsurance	573,940
Mortgage insurance | All outstanding liabilities before 2015, net of reinsurance
Short-Duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Cumulative paid claims, net of reinsurance	7,411
Mortgage insurance
Short-Duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Liabilities for claims, net of reinsurance	308,290
Mortgage insurance | Mortgage insurance
Short-Duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Liabilities for claims, net of reinsurance	$ 308,290