Losses and LAE - Reserve Activity (Details)	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Time in default	2 years
Mortgage Insurance | Primary Mortgage Product
New defaults	8.00%	8.00%	8.00%
Foreclosure Stage Defaults	65.00%	75.00%	85.00%
Mortgage Insurance | Time in Default: less than 2 years | Primary Mortgage Product
Defaults not in Foreclosure Stage	21.00%	21.80%	41.60%
Mortgage Insurance | Time in Default: less than 2 years | Maximum | Primary Mortgage Product
Defaults not in Foreclosure Stage	50.00%	55.00%	80.10%
Mortgage Insurance | Time in Default: 2 - 5 years | Primary Mortgage Product
Defaults not in Foreclosure Stage	55.00%	65.00%	75.00%
Mortgage Insurance | Time in Default: > 5 years | Primary Mortgage Product
Defaults not in Foreclosure Stage	60.00%	70.00%	80.00%