Consolidated Statements of Operations (Parenthetical) - Parent Company [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Interest Income	$ 1,811	$ 1,180	$ 1,590
Trading Securities, Change in Unrealized Holding Gain (Loss)	$ (1,136)	$ (773)	$ 1,734