Losses and LAE - Reserve for Losses and LAE by Segment (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2021
Liability for Claims and Claims Adjustment Expense [Line Items]
Total reserve for losses and LAE	$ 379,434	$ 426,843
Mortgage insurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Total reserve for losses and LAE	373,681	420,955	$ 588,947	$ 823,136
Title insurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Total reserve for losses and LAE	5,753	5,888
Primary case | Mortgage insurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Total reserve for losses and LAE	353,281	398,874
Primary IBNR and LAE | Mortgage insurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Total reserve for losses and LAE	10,483	12,169
Pool and other | Mortgage insurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Total reserve for losses and LAE	$ 9,917	$ 9,912