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Reinsurance (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
May 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Insurance [Abstract]        
Reinsurance Retention Policy, Excess Retention, Amount Reinsured   $ 3,300,000    
Insurance Commissions and Fees, Flood Program $ 1,467   $ 1,506 $ 1,575
Percentage of Flood Premiums Ceded 100.00%      
Increase (Decrease) in Ceded Losses and LAE Incurred $ (96,016)