Income Taxes - Schedule of Difference of Income Tax Expense from the United States Federal Income Tax Rates (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Amount
Tax expense at statutory rate	$ 5,305	$ 5,427	$ 3,192
State taxes, net	1,576	1,156	852
Permanent differences	678	491	244
Equity-based compensation benefits	(219)	(305)	371
Post-employment benefits	0	(67)	345
Uncertain tax position	0	49	93
Valuation allowance	206	287	213
Other	(35)	(18)	(123)
Income Tax Expense	$ 7,511	$ 7,020	$ 5,187
Percentage
Tax expense at statutory rate (as a percent)	21.00%	21.00%	21.00%
State taxes, net (as a percent)	6.24%	4.48%	5.60%
Permanent differences (as a percent)	2.68%	1.90%	1.61%
Equity-based compensation benefits (as a percent)	(0.87%)	(1.18%)	2.44%
Post-employment benefits (as a percent)	0.00%	(0.26%)	2.27%
Uncertain tax position (as a percent)	0.00%	0.19%	0.61%
Valuation allowance on capital loss (as a percent)	0.82%	1.11%	1.40%
Other (as a percent)	(0.14%)	(0.07%)	(0.80%)
Total percentage	29.73%	27.17%	34.13%