Losses and LAE - Reserve for Losses and LAE by Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Total gross reserve for losses and LAE	$ 426,843	$ 828,642
Mortgage insurance
Total gross reserve for losses and LAE	420,955	823,136	$ 844,107	$ 401,273
Title insurance
Total gross reserve for losses and LAE	5,888	5,506
Primary case | Mortgage insurance
Total gross reserve for losses and LAE	398,874	790,380
Primary IBNR and LAE | Mortgage insurance
Total gross reserve for losses and LAE	12,169	22,745
Pool and other | Mortgage insurance
Total gross reserve for losses and LAE	$ 9,912	$ 10,011