Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Current federal income tax expense	$ 40,201	$ 39,756	$ 39,498
Current state income tax expense	12,059	14,153	15,931
Total current tax expense	52,260	53,909	55,429
Deferred federal income tax expense (benefit)	(5,212)	78	(2,634)
Deferred state income tax expense (benefit)	(3,120)	(139)	(863)
Total deferred tax expense (benefit)	(8,332)	(61)	(3,497)
Total income tax expense	$ 43,928	$ 53,848	$ 51,932