Other Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Other Assets [Line Items]
Nonmarketable investment securities	$ 1,650	$ 1,621
Accrued interest receivable	2,581	2,458
Deferred income taxes	8,883	12,132
Prepaid expenses	1,161	1,039
Other assets	6,120	6,670
Total	$ 20,395	$ 23,920