Income Taxes - Income Tax Expense (Benefit), Continuing Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current tax expense:
Federal	$ 17,278	$ 12,074	$ 12,032
State	4,119	5,057	5,369
Deferred tax expense	(2,224)	(301)	(397)
Total Income tax expense	$ 19,173	$ 16,830	$ 17,004