Income Taxes - Schedule of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Federal
Current									$ 24,521	$ 24,825	$ 15,979
Deferred									665	(427)	1,536
Total Federal									25,186	24,398	17,515
State
Current									248	0	0
Deferred									(129)	0	0
Total Federal and State									119	0	0
Total State	$ 6,510	$ 7,367	$ 5,496	$ 5,931	$ 6,814	$ 6,407	$ 6,498	$ 4,680	$ 25,305	$ 24,398	$ 17,515