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Investments (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Fixed income securities:    
Amortized Cost $ 32,872 $ 26,793
Gross Unrealized Gains 69 40
Gross Unrealized Losses (235) (274)
Estimated Fair Value 32,706 26,559
Equity Securities    
Amortized Cost Basis 1,000 1,000
Gross Unrealized Gains 151 136
Estimated Fair Value 1,151 1,136
Total Securities    
Amortized Cost 33,872 27,793
Gross Unrealized Gains 220 176
Gross Unrealized Losses (235) (274)
Estimated Fair Value 33,857 27,695
Common Stock [Member]    
Equity Securities    
Amortized Cost Basis 1,000 1,000
Gross Unrealized Gains 151 136
Estimated Fair Value 1,151 1,136
U.S. government [Member]    
Fixed income securities:    
Amortized Cost 1,997 1,623
Gross Unrealized Gains 4 1
Gross Unrealized Losses (18) (20)
Estimated Fair Value 1,983 1,604
States, Municipalities and Political Subdivisions [Member]    
Fixed income securities:    
Amortized Cost 3,168 2,271
Gross Unrealized Gains 10 2
Gross Unrealized Losses (21) (27)
Estimated Fair Value 3,157 2,246
Asset-backed Securities and Collateralized Mortgage Backed Obligations [Member]    
Fixed income securities:    
Amortized Cost 12,655 12,095
Gross Unrealized Gains 10 9
Gross Unrealized Losses (131) (136)
Estimated Fair Value 12,534 11,968
Corporate [Member]    
Fixed income securities:    
Amortized Cost 15,052 10,804
Gross Unrealized Gains 45 28
Gross Unrealized Losses (65) (91)
Estimated Fair Value $ 15,032 $ 10,741