Losses and LAE - Net Outstanding Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Total gross reserve for losses and LAE	$ 426,843	$ 828,642
Mortgage
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Reinsurance recoverable on unpaid claims	24,727	66,676	$ 71,769	$ 14,594
Unallocated LAE	10,283
Total gross reserve for losses and LAE	420,955	823,136	$ 844,107	$ 401,273
Title insurance
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Total gross reserve for losses and LAE	5,888	$ 5,506
Mortgage insurance | Mortgage
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Reserve for losses and LAE, net of reinsurance	$ 385,945