Long-Term Debt (Components Of Long-Term Debt) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Long-term Debt, Unclassified [Abstract]
Long-term debt	$ 16,495	$ 16,495
Junior subordinated debentures, interest rate	5.62%	5.09%
Junior subordinated debentures, due date	Jun. 30, 2038	Jun. 30, 2038
Percent over three month LIBOR Rate	3.50%	3.50%
Junior subordinated debenture, Threshold in days	90 days	90 days