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Investments - Cost or Amortized Cost, Gross Unrealized Gains and Losses, Fair Value and OTTI (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Investments    
Cost or Amortized Cost $ 41,783  
Fair Value 45,549  
Fixed maturity securities    
Investments    
Cost or Amortized Cost 31,969 $ 77,093
Gross Unrealized Gains 3,696 8,870
Gross Unrealized Losses (17) (215)
Fair Value 35,648 85,748
Fixed maturity securities | OTTI | Available-for-sale securities.    
Investments    
OTTI in AOCI 294 359
Fixed maturity securities | United States government and government agencies and authorities    
Investments    
Cost or Amortized Cost 685 646
Gross Unrealized Gains 146 167
Gross Unrealized Losses 0 0
Fair Value 831 813
Fixed maturity securities | United States government and government agencies and authorities | OTTI | Available-for-sale securities.    
Investments    
OTTI in AOCI 0 0
Fixed maturity securities | States, municipalities and political subdivisions    
Investments    
Cost or Amortized Cost 6,347 24,128
Gross Unrealized Gains 410 1,547
Gross Unrealized Losses 0 (1)
Fair Value 6,757 25,674
Fixed maturity securities | States, municipalities and political subdivisions | OTTI | Available-for-sale securities.    
Investments    
OTTI in AOCI 0 0
Fixed maturity securities | Foreign governments    
Investments    
Cost or Amortized Cost 255 255
Gross Unrealized Gains 114 114
Gross Unrealized Losses 0 0
Fair Value 369 369
Fixed maturity securities | Foreign governments | OTTI | Available-for-sale securities.    
Investments    
OTTI in AOCI 0 0
Fixed maturity securities | Commercial mortgage-backed    
Investments    
Cost or Amortized Cost   385
Gross Unrealized Gains   6
Gross Unrealized Losses   0
Fair Value   391
Fixed maturity securities | Commercial mortgage-backed | OTTI | Available-for-sale securities.    
Investments    
OTTI in AOCI   0
Fixed maturity securities | Residential mortgage-backed    
Investments    
Cost or Amortized Cost 3,129 6,356
Gross Unrealized Gains 494 925
Gross Unrealized Losses 0 (9)
Fair Value 3,623 7,272
Fixed maturity securities | Residential mortgage-backed | OTTI | Available-for-sale securities.    
Investments    
OTTI in AOCI 294 438
Fixed maturity securities | U.S. corporate    
Investments    
Cost or Amortized Cost 17,734 38,997
Gross Unrealized Gains 1,915 5,309
Gross Unrealized Losses (17) (198)
Fair Value 19,632 44,108
Fixed maturity securities | U.S. corporate | OTTI | Available-for-sale securities.    
Investments    
OTTI in AOCI 0 (79)
Fixed maturity securities | Foreign corporate    
Investments    
Cost or Amortized Cost 3,819 6,326
Gross Unrealized Gains 617 802
Gross Unrealized Losses 0 (7)
Fair Value 4,436 7,121
Fixed maturity securities | Foreign corporate | OTTI | Available-for-sale securities.    
Investments    
OTTI in AOCI 0 0
Equity securities | Non-redeemable preferred stocks    
Investments    
Cost or Amortized Cost 139 6,932
Gross Unrealized Gains 87 611
Gross Unrealized Losses 0 (124)
Fair Value 226 7,419
Equity securities | Non-redeemable preferred stocks | OTTI | Available-for-sale securities.    
Investments    
OTTI in AOCI $ 0 $ 0