Losses and LAE - Reserve for Losses and LAE by Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Total gross reserve for losses and LAE	$ 370,148	$ 426,843
Mortgage insurance
Total gross reserve for losses and LAE	364,923	420,955	$ 823,136	$ 844,107
Title insurance
Total gross reserve for losses and LAE	5,225	5,888
Primary case | Mortgage insurance
Total gross reserve for losses and LAE	344,235	398,874
Primary IBNR and LAE | Mortgage insurance
Total gross reserve for losses and LAE	12,177	12,169
Pool and other | Mortgage insurance
Total gross reserve for losses and LAE	$ 8,511	$ 9,912