Income Taxes - Income Tax Expense (Benefit) Attributable to Income from Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current
Federal	$ 22,199	$ 15,161	$ 16,391
State	4,009	2,782	3,060
Total	26,208	17,943	19,451
Deferred
Federal	(5,247)	2,668	2,281
State	(1,037)	405	73
Deferred tax expense	(6,284)	3,073	2,354
Federal Total	16,952	17,829	18,672
State Total	2,972	3,187	3,133
Tax expense (benefit)	$ 19,924	$ 21,016	$ 21,805