Losses and LAE - Net Outstanding Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Total gross reserve for losses and LAE	$ 370,148	$ 426,843
Mortgage Insurance
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Reserve for losses and LAE, net of reinsurance	329,204
Reinsurance recoverable on unpaid claims	25,074	24,727	$ 66,676	$ 71,769
Unallocated LAE	10,645
Total gross reserve for losses and LAE	364,923	420,955	$ 823,136	$ 844,107
Title insurance
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Total gross reserve for losses and LAE	5,225	$ 5,888
Mortgage insurance | Mortgage Insurance
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Reserve for losses and LAE, net of reinsurance	$ 329,204