Net Income Per Share - Schedule of Reconciliation of Denominators and Additional Shares that are Excluded from the Calculation of EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Weighted-average shares:
Basic weighted-average common shares outstanding	40,183	32,636	40,425	32,631
Total weighted-average shares	40,242	32,636	40,484	32,631
Earnings per common share—Basic
Net income	$ 9,553	$ 4,962	$ 18,000	$ 8,410
Net income available to common shareholders—Basic	$ 9,539	$ 4,962	$ 17,974	$ 8,410
Net income per common share—Basic	$ 0.24	$ 0.15	$ 0.44	$ 0.26
Basic weighted-average common shares outstanding	40,183	32,636	40,425	32,631
Effect of diluted shares	642	192	733	0
Diluted weighted-average shares outstanding	40,825	32,828	41,158	32,631
Net income per common share—Diluted	$ 0.23	$ 0.15	$ 0.44	$ 0.26
RSAs
Weighted-average shares:
Basic weighted-average common shares outstanding	59	0	59	0
Earnings per common share—Basic
Less: Undistributed earnings allocated to RSAs	$ 14	$ 0	$ 26	$ 0
Basic weighted-average common shares outstanding	59	0	59	0
Common Stock
Weighted-average shares:
Basic weighted-average common shares outstanding	40,183	32,636	40,425	32,631
Earnings per common share—Basic
Basic weighted-average common shares outstanding	40,183	32,636	40,425	32,631