Loans (Change in accretable yield) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period	$ 101	$ 168	$ 182	$ 557
Original yield discount, net, at date of acquisitions	0	0	0	19
Accretion	(700)	(379)	(1,074)	(845)
Reclassification from nonaccretable difference	654	331	947	389
Balance at end of period	$ 55	$ 120	$ 55	$ 120