Investments, Fixed Maturities by Contractual Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Carrying Value [Abstract]
Due in one year or less	$ 1,498	$ 1,653
Due after one year through five years	16,936	13,738
Due after five years through ten years	127,271	112,847
Due after ten years	53,646	67,328
Varying maturities	18,497	19,542
Totals	217,848	215,108
Amortized Cost [Abstract]
Due in one year or less	1,502	1,655
Due after one year through five years	17,402	14,056
Due after five years through ten years	130,853	112,116
Due after ten years	53,539	64,928
Varying maturities	19,132	19,789
Cost or amortized cost	$ 222,428	$ 212,544