Other Real Estate Owned ("OREO") (Foreclosed Real Estate Roll Forward) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Other Real Estate Owned ("OREO") [Abstract]
Balance at beginning of year			$ 9,341	$ 7,763	$ 7,763
Additions of underlying property			282	3,622	3,634
Disposals of underlying property			(991)	(1,068)	(1,456)
Valuation allowance	$ (142)	$ (263)	(425)	(576)	(600)
Balance at end of period	$ 8,207	$ 9,741	$ 8,207	$ 9,741	$ 9,341