Losses and LAE - Schedule of Default to Claim Rates on Primary Portfolio (Parenthetical) (Details)	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Time in default	2 years
Primary Mortgage Product | Mortgage insurance | Time in Default: less than 2 years
Defaults not in Foreclosure Stage	20.20%	21.00%	21.80%
Maximum | Primary Mortgage Product | Mortgage insurance | Time in Default: less than 2 years
Defaults not in Foreclosure Stage	42.70%	50.00%	55.00%