Other Operating Expense (Schedule of Other Operating Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Income and Expenses [Abstract]
Postage and supplies	$ 2,087	$ 1,925	$ 1,954
Promotional expense	2,557	2,187	2,268
Professional fees	1,650	1,930	1,690
Outside service fees	4,424	3,316	2,848
Data processing services	897	372	357
Telecommunications	749	1,000	1,068
Other	1,722	1,913	1,185
Total other operating expense	$ 14,086	$ 12,643	$ 11,370