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Summary of Significant Accounting Policies (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
Subsidiary
Dec. 31, 2015
USD ($)
Principles of Consolidation [Abstract]    
Number of insurance subsidiaries owned by the parent | Subsidiary 4  
Number of non-insurance subsidiaries owned by the parent | Subsidiary 1  
Investments [Abstract]    
Estimated fair value $ 1,264 $ 2,237
Recently Issued Accounting Standards [Abstract]    
Equity securities available-for-sale 20,257 $ 23,131
ASU 2016-01 [Member]    
Recently Issued Accounting Standards [Abstract]    
Equity securities available-for-sale 20,257  
Equity securities unrealized gains, net of tax 5,723  
New accounting pronouncement, effect of change on income, net of tax $ (2,193)