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Income Taxes - Differences Between Federal Tax Rate and Company's Effective Tax Rate for Results of Continuing Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Taxes [Abstract]
U.S. tax at statutory rate	$ 11,782	$ 10,125	$ 11,274
State income taxes, net of federal benefit	2,478	1,956	2,059
Excess equity compensation deduction	(246)	(99)	(871)
Non-deductible expenses	1,258	1,040	1,185
Total income tax provision	$ 15,272	$ 13,022	$ 13,647
U.S. tax at statutory rate	21.00%	21.00%	21.00%
State income taxes, net of federal benefit and tax reform	4.40%	3.90%	3.80%
Excess equity compensation deduction	(0.40%)	0.00%	(1.60%)
Nondeductible expenses	2.20%	2.10%	2.20%
Total	27.20%	27.00%	25.40%

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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