Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Reconciliation of income tax expense (benefit) [Abstract]
Federal income tax provision at statutory rate of 21% and 35% for 2018 and 2017, respectively	$ 225	$ 221	$ (262)	$ 864
Dividends-received deduction	(10)	(23)	(30)	(71)
Small life insurance company deduction	0	(313)	0	(343)
Other permanent differences	22	18	50	52
Adjustment for prior years' estimates to actual	(99)	(19)	(99)	(19)
Income tax expense (benefit)	138	(116)	$ (341)	$ 483
Federal statutory income tax rate			21.00%	35.00%	35.00%
Components of income tax expense (benefit) [Abstract]
Current - Federal	255	(157)	$ 994	$ 906
Deferred - Federal	(117)	41	(1,335)	(423)
Income tax expense (benefit)	$ 138	(116)	$ (341)	$ 483
SLD as percentage of life insurance company taxable income				60.00%
Percentage of reduction in SLD				15.00%
Tentative amount of LICTI to reduction of SLD		3,000		$ 3,000
Tentative amount of LICTI to phase out of SLD		$ 15,000		$ 15,000