Losses and LAE - Reserve Activity (Details)	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Time in default	2 years
Mortgage | Primary Mortgage Product
New defaults	8.00%	8.00%	8.50%
Foreclosure Stage Defaults	75.00%	85.00%	75.00%
Mortgage | Time in Default: less than 2 years | Primary Mortgage Product
Defaults not in Foreclosure Stage	21.80%	41.60%	21.00%
Mortgage | Time in Default: less than 2 years | Maximum | Primary Mortgage Product
Defaults not in Foreclosure Stage	55.00%	80.10%	55.00%
Mortgage | Time in Default: 2 - 5 years | Primary Mortgage Product
Defaults not in Foreclosure Stage	65.00%	75.00%	62.50%
Mortgage | Time in Default: > 5 years | Primary Mortgage Product
Defaults not in Foreclosure Stage	70.00%	80.00%	70.00%