Stock Based Compensation - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Options Granted
Outstanding at beginning of period	548,550	592,550	900,884
Options exercised	(117,500)	(44,000)	(308,334)
Options forfeited	(57,000)
Outstanding at end of period	374,050	548,550	592,550
Options exercisable	374,050	548,550	592,550
Weighted Average Exercise Price
Outstanding at beginning of period	$ 7.79	$ 7.78	$ 7.73
Options exercised	7.79	7.60	7.64
Options forfeited	7.66
Outstanding at end of period	7.81	7.79	7.78
Options exercisable	$ 7.81	$ 7.79	$ 7.78
Weighted-Average Remaining Contractual Term
Outstanding at end of period	1 year 29 days	2 years 7 days	2 years 10 months 17 days
Options exercisable	1 year 29 days	2 years 7 days	2 years 10 months 17 days
Aggregate Intrinsic Value
Outstanding at end of period	$ 3,586	$ 5,270	$ 3,012
Options exercisable	$ 3,586	$ 5,270	$ 3,012