Income Taxes - Summary of Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
Federal	$ 23,407	$ 35,673	$ 33,032
State	5,992	7,179	6,958
Total	29,399	42,852	39,990
Deferred:
Federal	(9,526)	2,924	2,163
State	(3,487)	(1,037)	838
Total	(13,013)	1,887	3,001
Tax provision	$ 16,386	$ 44,739	$ 42,991