Loans (Change in accretable yield on acquired loans) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period	$ 463	$ 101	$ 57	$ 182
Original yield discount, net, at date of acquisition	0	0	508	0
Accretion	(93)	(700)	(943)	(1,074)
Reclassification from nonaccretable difference	186	654	934	947
Balance at end of period	$ 556	$ 55	$ 556	$ 55