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Summary of Significant Accounting Policies (Details 5) - Guaranteed Minimum Death Benefit [Member] - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Summary Of Guaranteed Minimum Death Benefit [Abstract]    
GMDB reserve $ 225 $ 358
Aggregate in-the-money death benefits under the GMDB provision $ 32,106 $ 35,563
Variable annuity contract value distribution based on GMDB feature:    
No guarantee 32.00% 32.00%
Return of premium guarantee 62.00% 62.00%
Guarantee of premium roll-up at an annual rate of 3% or 5% 6.00% 6.00%
Total 100.00% 100.00%