Junior Subordinated Debentures (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Debt Disclosure [Abstract]
Common stock issued by Trusts	$ 14,300	$ 14,300
Loss on junior subordinated debentures carried at fair value	$ 14,727	$ 6,323	$ 6,306