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Historical Loss and LAE Development - Schedule of Reconciliation of Unpaid Losses and Settlement Expenses (LAE) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Unpaid losses and LAE at beginning of year    
Gross $ 1,750,049 $ 1,574,352
Ceded (443,729) (384,517)
Net 1,306,320 1,189,835
Increase (decrease) in incurred losses and LAE    
Current accident year 142,013 126,194
Prior accident years (37,121) (15,173)
Total incurred 104,892 111,021
Loss and LAE payments for claims incurred    
Current accident year (5,962) (9,295)
Prior accident years (64,896) (81,897)
Total paid (70,858) (91,192)
Net unpaid losses and LAE at March 31 1,340,354 1,208,319
Unpaid losses and LAE at March 31    
Gross 1,795,275 1,574,760
Ceded (454,921) (366,441)
Net unpaid losses and LAE at March 31 $ 1,340,354 1,208,319
ASU 2016-13 | Cumulative Effect, Period of Adoption, Adjustment    
Unpaid losses and LAE at beginning of year    
Ceded   $ (1,345)