Net Income per Share (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net Income per Share [Abstract]
Net income	[1]	$ 2,914	$ 3,916	$ 5,023	$ 11,719
Earnings allocated to RSUs		(67)	(153)	(116)	(444)
Net income available to common shareholders		$ 2,847	$ 3,763	$ 4,907	$ 11,275

[1] There is no material difference between net income and comprehensive income.