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Loss Reserves - Reconciliation of Beginning and Ending Balances (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Loss Reserve [Roll Forward]    
Reserve at beginning of period $ 462,662 $ 505,379
Less reinsurance recoverable 47,281 33,302
Net reserve at beginning of period 415,381 472,077
Losses and LAE incurred in respect of delinquency notices received in:    
Current year 154,162 158,317
Prior years (136,478) (181,876)
Total losses incurred 17,684 (23,559)
Losses and LAE paid in respect of delinquency notices received in:    
Current year 154 133
Prior years 38,316 33,138
Total losses paid 38,470 33,271
Net reserve at end of period 394,595 415,247
Plus reinsurance recoverable 57,565 45,327
Reserve at end of period $ 452,160 $ 460,574