Income Taxes - Summary of Income Tax Expense (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
Income tax expense:
Current									$ 22,766	$ 12,971	$ 14,091
Deferred									(2,080)	3,908	708
Change in valuation allowance for deferred tax asset									0	23	(7)
Income tax expense	$ 9,876	$ 6,929	$ 4,505	$ (624)	$ 5,322	$ 3,172	$ 3,927	$ 4,481	$ 20,686	$ 16,902	$ 14,792