Other Assets (Schedule of Other Assets) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Other Assets [Abstract]
Nonmarketable investment securities	$ 3,069	$ 1,650
Accrued interest receivable	2,865	2,675
Deferred income taxes	3,467	7,039
Prepaid expenses	1,111	1,149
Cash surrender value of life insurance	2,599	2,589
Other assets	4,385	3,781
Total	$ 17,496	$ 18,883