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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Unpaid losses and LAE at beginning of year:      
Gross $ 1,750,049 $ 1,574,352 $ 1,461,348
Ceded (443,729) (384,517) (364,999)
Net 1,306,320 1,189,835 1,096,349
Increase (decrease) in incurred losses and LAE:      
Current accident year 582,065 543,937 488,700
Prior accident years (125,463) (101,053) (75,284)
Total incurred 456,602 442,884 413,416
Loss and LAE payments for claims incurred:      
Current accident year (101,590) (93,077) (80,055)
Prior accident year (225,863) (231,977) (239,875)
Total paid (327,453) (325,054) (319,930)
Net unpaid losses and LAE at end of year 1,435,469 1,306,320 1,189,835
Unpaid losses and LAE at end of year:      
Gross 2,043,555 1,750,049 1,574,352
Ceded (608,086) (443,729) (384,517)
Net unpaid losses and LAE at end of year $ 1,435,469 1,306,320 1,189,835
ASU 2016-13 | Cumulative Effect, Period of Adoption, Adjustment      
Unpaid losses and LAE at beginning of year:      
Ceded   $ (1,345)  
Unpaid losses and LAE at end of year:      
Ceded     $ (1,345)