Investments, Aggregated by Industry (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Investments aggregated by industry [Abstract]
Carrying value	$ 215,108	$ 210,670
Cost or amortized cost	212,544	210,505
Carrying value	247,511	244,177
Cost or amortized cost	232,510	235,208
Unrealized gains (losses)	15,001	8,969
Fixed Maturities - U.S. Treasury Securities and Obligations of U.S. Government Agencies and Authorities [Member]
Investments aggregated by industry [Abstract]
Carrying value	31,155	31,102
Cost or amortized cost	31,517	31,458
Unrealized gains (losses)	(362)	(356)
Fixed Maturities - Obligations of States and Political Subdivisions [Member]
Investments aggregated by industry [Abstract]
Carrying value	10,809	17,572
Cost or amortized cost	10,180	17,255
Unrealized gains (losses)	629	317
Utilities and Telecom [Member]
Investments aggregated by industry [Abstract]
Carrying value	23,470	19,635
Cost or amortized cost	21,267	17,624
Unrealized gains (losses)	2,203	2,011
Financial Services [Member]
Investments aggregated by industry [Abstract]
Carrying value	59,320	62,684
Cost or amortized cost	56,873	61,141
Unrealized gains (losses)	2,447	1,543
Other Business - Diversified [Member]
Investments aggregated by industry [Abstract]
Carrying value	44,481	57,663
Cost or amortized cost	44,556	58,732
Unrealized gains (losses)	(75)	(1,069)
Other Consumer - Diversified [Member]
Investments aggregated by industry [Abstract]
Carrying value	69,228	42,271
Cost or amortized cost	59,069	35,748
Unrealized gains (losses)	10,159	6,523
Other Investments [Member]
Investments aggregated by industry [Abstract]
Carrying value	9,048	13,250
Cost or amortized cost	$ 9,048	$ 13,250