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Concentration Risk Disclosure [Text Block] (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Assets Held by Insurance Regulators $ 12,823 $ 12,819
Credit Concentration Risk    
Fair Value, Concentration of Risk, Investments [1] $ 0  
Credit Concentration Risk | Stockholders' Equity, Total    
Concentration Risk, Percentage 10.00%  
Reinsurer Concentration Risk | Stockholders' Equity, Total    
Concentration Risk, Percentage 10.00%  
[1] Except for investments in obligations of the U.S. Government and its agencies and mortgage-backed securities issued by GSEs.