Basis of Presentation - Schedule of Basic and Diluted Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Basic earnings per share calculation:
Net income	$ 40,591	$ 47,856	$ 32,462
Weighted-average basic shares outstanding	19,165,182	17,180,000	17,180,000
Basic earnings per share	$ 2.12	$ 2.79	$ 1.89
Diluted earnings per share:
Net income	$ 40,591	$ 47,856	$ 32,462
Weighted-average basic shares outstanding	19,165,182	17,180,000	17,180,000
Average diluted common shares outstanding	146,992	0	0
Weighted-average diluted shares outstanding	19,312,174	17,180,000	17,180,000
Diluted earnings per share	$ 2.10	$ 2.79	$ 1.89
Unaudited pro forma earnings per share:
Pro forma net income	$ 39,422	$ 32,995	$ 22,356
Weighted-average basic shares outstanding	19,165,182	17,180,000	17,180,000
Pro forma basic earnings per share	$ 2.06	$ 1.92	$ 1.30
Unaudited pro forma diluted earnings per share:
Pro forma net income	$ 39,422	$ 32,995	$ 22,356
Weighted-average diluted shares outstanding	19,312,174	17,180,000	17,180,000
Pro forma diluted earnings per share	$ 2.04	$ 1.92	$ 1.30