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Loss Reserves - Reconciliation of Beginning and Ending Balances (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Loss Reserve [Roll Forward]    
Reserve at beginning of period $ 474,884 $ 462,662
Less reinsurance recoverable 65,055 47,281
Net reserve at beginning of period 409,829 415,381
Losses and LAE incurred in respect of delinquency notices received in:    
Current year 64,471 59,497
Prior years (31,229) (49,906)
Total losses incurred 33,242 9,591
Losses and LAE paid in respect of delinquency notices received in:    
Current year 15 0
Prior years 17,120 11,803
Total losses paid 17,135 11,803
Net reserve at end of period 425,936 413,169
Plus reinsurance recoverable 73,184 51,864
Reserve at end of period $ 499,120 $ 465,033