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Losses and LAE - Additional Disclosures: Historical Claims Duration (Details) - Mortgage insurance
Dec. 31, 2023
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]  
1 7.20%
2 28.70%
3 23.70%
4 10.40%
5 3.70%
6 1.20%
7 0.80%
8 0.20%
9 0.10%
10 0.10%