Income Taxes - Components of Income Tax Expense Benefit (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current
Federal									$ 15,731	$ 1,991	$ 18,030
State									6,617	740	108
Total current									22,348	2,731	18,138
Deferred
Federal									(2,746)	18,846	(4,568)
State									(1,869)	(2,793)	0
Total deferred									(4,615)	16,053	(4,568)
Total provision for income taxes	$ 10,419	$ (2,608)	$ 5,878	$ 4,044	$ 3,181	$ 6,302	$ 4,465	$ 4,836	$ 17,733	$ 18,784	$ 13,570