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Insurance Company WNFIC - Additional Information (Details)
 12 Months Ended
Dec. 31, 2019
USD ($)
Reinsurer
Dec. 31, 2018
USD ($)
Dec. 31, 2020
USD ($)
Sep. 30, 2019
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]        
Ceded rate of premiums under insurance program 100.00%      
Premiums written net $ 697,059,000 $ 619,206,000    
Ceded unpaid loss 58,500,000 65,400,000    
Prepaid reinsurance premiums 366,021,000 337,920,000    
Increase (decrease) in loss and loss adjustment expense reserve 0 200,000    
Reserve for losses and loss adjustment expense $ 58,500,000 65,400,000    
Number of reinsurers | Reinsurer 2      
Maximum        
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]        
Preferred stock, dividend rate, percentage 10.00%      
Wright National Flood Insurance Company        
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]        
Ceded rate of premiums under insurance program 100.00%      
Expenses and allowance rate received in premiums 30.10%     30.00%
Premiums written net $ 694,900,000 617,200,000    
Statutory capital and surplus required 7,500,000      
Statutory capital and surplus 29,600,000 19,400,000    
Statutory net Income $ 8,100,000 $ 4,500,000    
Preferred stock, dividend rate, percentage 100.00%      
Wright National Flood Insurance Company | Scenario, Forecast        
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]        
Maximum dividend payout that may be made without prior approval     $ 8,100