Losses and LAE - Reserve for Losses and LAE by Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Total gross reserve for losses and LAE	$ 828,642	$ 848,413
Mortgage
Total gross reserve for losses and LAE	823,136	844,107	$ 401,273	$ 397,891
Reportable Segment Total
Total gross reserve for losses and LAE	5,506	4,306
Primary Case Reserves | Prime Mortgage Insurance Product | Mortgage
Total gross reserve for losses and LAE	$ 790,400	$ 799,500