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Loss and Loss Adjustment Expenses - Summary of Activity related to the loss and LAE reserves (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Liability for Unpaid Claims and Claims Adjustment Expense, Activity in Liability [Abstract]        
Balances, beginning of period $ 571,812 $ 293,687 $ 595,487 $ 249,567
Less reinsurance recoverables 240,241 78,360 341,051 105,092
Beginning balance 331,571 215,327 254,436 144,475
Incurred related to:        
Current year 66,755 110,255 263,505 279,169
Prior years (33,515) 1,409 (55,135) 1,036
Total incurred 33,240 111,664 208,370 280,205
Paid related to:        
Paid related Current year 36,191 42,433 72,140 91,586
Paid related to Prior years 12,600 6,599 74,646 55,135
Total paid 48,791 49,032 146,786 146,721
Ending balance 316,020 277,959 316,020 277,959
Plus reinsurance recoverables 207,939 78,709 207,939 78,709
Balances at June 30 $ 523,959 $ 356,668 $ 523,959 $ 356,668