Losses and LAE - Reserve for Losses and LAE by Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Liability for Claims and Claims Adjustment Expense [Line Items]
Total gross reserve for losses and LAE	$ 360,326	$ 370,148
Mortgage insurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Total gross reserve for losses and LAE	354,431	364,923	$ 420,955	$ 823,136
Title Insurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Total gross reserve for losses and LAE	5,895	5,225
Primary case | Mortgage insurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Total gross reserve for losses and LAE	336,553	344,235
Primary IBNR and LAE | Mortgage insurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Total gross reserve for losses and LAE	13,399	12,177
Pool and other | Mortgage insurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Total gross reserve for losses and LAE	$ 4,479	$ 8,511