Basis of Presentation - Schedule of Basic and Diluted Earnings Per Common 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
Basic earnings per share calculation:
Net income	$ 1,207	$ 15,905	$ 31,581	$ 38,665
Weighted-average basic shares outstanding	18,259,128	17,180,000	17,542,335	17,180,000
Basic earnings per share	$ 0.07	$ 0.93	$ 1.80	$ 2.25
Diluted earnings per share:
Net income	$ 1,207	$ 15,905	$ 31,581	$ 38,665
Weighted-average basic shares outstanding	18,259,128	17,180,000	17,542,335	17,180,000
Average diluted common shares outstanding	73,064		24,532
Weighted-average diluted shares outstanding	18,332,192	17,180,000	17,566,867	17,180,000
Diluted earnings per share	$ 0.07	$ 0.93	$ 1.80	$ 2.25
Pro forma earnings per share:
Pro forma net income	$ 10,033	$ 11,583	$ 30,412	$ 27,029
Weighted-average basic shares outstanding	18,259,128	17,180,000	17,542,335	17,180,000
Pro forma basic earnings per share	$ 0.55	$ 0.67	$ 1.73	$ 1.57
Pro forma diluted earnings per share:
Pro forma net income	$ 10,033	$ 11,583	$ 30,412	$ 27,029
Weighted-average diluted shares outstanding	18,332,192	17,180,000	17,566,867	17,180,000
Pro forma diluted earnings per share	$ 0.55	$ 0.67	$ 1.73	$ 1.57