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Historical Loss and LAE Development - Schedule of Reconciliation of Unpaid Losses and Settlement Expenses (LAE) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Unpaid losses and LAE at beginning of year      
Gross $ 2,043,555 $ 1,750,049 $ 1,574,352
Ceded (608,086) (443,729) (384,517)
Net 1,435,469 1,306,320 1,189,835
Increase (decrease) in incurred losses and LAE      
Current accident year 636,955 582,065 543,937
Prior accident years (122,579) (125,463) (101,053)
Total incurred 514,376 456,602 442,884
Loss and LAE payments for claims incurred      
Current accident year (97,525) (101,590) (93,077)
Prior accident years (276,772) (225,863) (231,977)
Total paid (374,297) (327,453) (325,054)
Net unpaid losses and LAE at end of year 1,575,548 1,435,469 1,306,320
Unpaid losses and LAE at end of year      
Gross 2,315,637 2,043,555 1,750,049
Ceded (740,089) (608,086) (443,729)
Net unpaid losses and LAE at end of year $ 1,575,548 $ 1,435,469 1,306,320
ASU 2016-13 | Cumulative Effect, Period of Adoption, Adjustment      
Unpaid losses and LAE at beginning of year      
Ceded     $ (1,345)