Income Taxes - Components of Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current
Federal	$ 27,852	$ 23,066	$ 18,864
State	9,751	6,129	3,668
Total current tax expense (benefit)	37,603	29,195	22,532
Deferred
Federal	3,899	3,535	5,901
State	2,433	2,447	4,528
Total deferred tax expense (benefit)	6,332	5,982	10,429
Income tax expense (benefit)	$ 43,935	$ 35,177	$ 32,961