Net Income per Share (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net Income per Share [Abstract]
Net income	[1]	$ 3,916	$ 4,322	$ 11,719	$ 16,337
Less earnings allocated to RSUs		(153)	(115)	(444)	(429)
Net income available to common shareholders		$ 3,763	$ 4,207	$ 11,275	$ 15,908

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