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Statutory Accounting and Regulation - Schedule of Affiliates' Surplus Regarding Policyholders (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
FLORIDA    
Statutory Accounting Practices    
Statutory capital and surplus required (percent of total liabilities) 10.00%  
Statutory Accounting Practices, Statutory Capital and Surplus Required, Dollar Limit $ 5,000  
United Property & Casualty Insurance Company    
Statutory Accounting Practices    
Statutory capital and surplus balance 139,109 $ 155,587
Family Security Insurance Company    
Statutory Accounting Practices    
Statutory capital and surplus balance 16,624 16,269
Interboro Insurance Company    
Statutory Accounting Practices    
Statutory capital and surplus balance 40,750 $ 40,442
American Coastal Insurance Company    
Statutory Accounting Practices    
Statutory capital and surplus balance 154,743  
Minimum | United Property & Casualty Insurance Company | FLORIDA    
Statutory Accounting Practices    
Statutory capital and surplus required 48,503  
Minimum | Family Security Insurance Company | HAWAII    
Statutory Accounting Practices    
Statutory capital and surplus required 3,250  
Minimum | Interboro Insurance Company | NEW YORK    
Statutory Accounting Practices    
Statutory capital and surplus required 4,700  
Minimum | American Coastal Insurance Company | FLORIDA    
Statutory Accounting Practices    
Statutory capital and surplus required $ 16,891