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Losses and LAE - Mortgage Insurance Reserve for Losses and LAE Rollforward (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Loss reserve [Roll Forward]      
Balance at beginning of year $ 370,148    
Deduct: Paid claims and LAE related to:      
Balance at end of year 360,326 $ 370,148  
Mortgage Insurance revenues      
Loss reserve [Roll Forward]      
Balance at beginning of year 364,923 420,955 $ 823,136
Less: Reinsurance recoverables 25,074 24,727 66,676
Balance at beginning of year, net of reinsurance recoverables 339,849 396,228 756,460
Add: Losses and LAE incurred in respect of default notices reported and unreported in:      
Current year 197,719 178,665 160,049
Prior years (199,967) (220,801) (499,423)
Total incurred (2,248) (42,136) (339,374)
Deduct: Paid claims and LAE related to:      
Current year 1,118 246 499
Prior years 16,196 13,997 20,359
Total paid 17,314 14,243 20,858
Balance at end of year, net of reinsurance recoverables 320,287 339,849 396,228
Add: reinsurance recoverables 34,144 25,074 24,727
Balance at end of year $ 354,431 $ 364,923 $ 420,955