Investments (Major Categories of Investment Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Investment income	$ 17,034	$ 14,842	$ 13,139
Investment expenses	(692)	(873)	(756)
Investment income (loss), net of expenses	16,342	13,969	12,383
U.S. Treasury securities and obligations of U.S. Government [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment income	594	670	395
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment income	5,573	1,435	1,378
Collateralized Corporate Bank Loans [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment income	3,190	4,727	4,400
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment income	5,442	5,901	5,232
Collateralized Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment income	1,320	1,288	995
Cash and Cash Equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment income	277	148	230
Parent Company [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment income (loss), net of expenses	70	120	133
Equity Securities [Member] | Equity Securities All Others [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment income	$ 638	$ 673	$ 509