Other Assets (Schedule of Other Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Other Assets [Abstract]
Nonmarketable investment securities	$ 3,069	$ 1,650
Accrued interest receivable	3,122	2,675
Deferred income taxes, net	2,628	7,040
Prepaid expenses	1,528	1,148
Cash surrender value of life insurance	671	2,589
Other assets	5,937	3,781
Total	$ 16,955	$ 18,883