Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share [Abstract]
Net income	$ 6,222	$ 7,615	$ 16,521	$ 16,880
Earnings per common share - basic	$ 0.54	$ 0.67	$ 1.45	$ 1.69
Earnings per common share - diluted	$ 0.54	$ 0.67	$ 1.44	$ 1.68