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Related Parties (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
Partnership
Director
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Related Party Transaction [Line Items]      
Market value of equity and fixed maturity securities portfolio managed by broker-dealers $ 25,142    
Total commissions and net fees earned by broker dealers and affiliates 27 $ 30  
Director [Member] | Consulting Contract [Member]      
Related Party Transaction [Line Items]      
Annual consulting contract fees 300   $ 300
Director [Member] | Brokerage Agreement [Member]      
Related Party Transaction [Line Items]      
Total commission expense 151    
Director [Member] | Brokerage Agreement, Placement of Life Insurance [Member]      
Related Party Transaction [Line Items]      
Total commission expense $ 350 155  
Limited Partnership [Member]      
Related Party Transaction [Line Items]      
Number of partnerships investment | Partnership 3    
Aggregate estimated value in limited partnership $ 41,864    
Number of directors that are executive officers, directors, and owners of the organization managing the limited partnership | Director 2    
Management fees $ 192 $ 173  
Limited Partnership [Member] | New Vernon India Fund [Member]      
Related Party Transaction [Line Items]      
Ownership interest in limited partnership 6.00%    
Limited Partnership [Member] | New Vernon Global Opportunity Fund [Member]      
Related Party Transaction [Line Items]      
Ownership interest in limited partnership 37.00%    
Limited Partnership [Member] | New Vernon Global Opportunity Fund II [Member]      
Related Party Transaction [Line Items]      
Ownership interest in limited partnership 27.00%