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Loss reserves - Activity for the Liability for Loss Reserves (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Gross loss reserves, beginning balance $ 524,715  
Gross loss reserves, ending balance 542,528  
Domestic mortgage insurance    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Gross loss reserves, beginning balance 520,032 $ 517,515
Reinsurance recoverable, beginning balance 2,909 1,294
Net loss reserves, beginning balance 517,123 516,221
Losses and LAE incurred related to current accident year 77,842 74,364
Losses and LAE incurred related to prior accident years (51,789) (54,848)
Total incurred 26,053 19,516
Losses and LAE paid related to current accident year (99) (191)
Losses and LAE paid related to prior accident years (8,395) (6,548)
Total paid (8,494) (6,739)
Net loss reserves, ending balance 534,682 528,998
Reinsurance recoverable, ending balance 2,798 1,772
Gross loss reserves, ending balance $ 537,480 $ 530,770