Stock-Based Compensation Plans - Summary of Stock Option Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Stock Options
Outstanding at beginning of year (in shares)	372,736
Granted (in shares)	6,000
Exercised (in shares)	(82,225)
Forfeited (in shares)	(25,000)
Expired (in shares)	(1,024)
Outstanding at end of year (in shares)	270,487	372,736
Weighted-average Exercise Price
Outstanding at beginning of year (in dollars per share)	$ 100.49
Granted (in dollars per share)	100.74
Exercised (in dollars per share)	59.17
Forfeited (in dollars per share)	104.81
Expired (in dollars per share)	111.35
Outstanding at end of year (in dollars per share)	$ 112.61	$ 100.49
Stock Options, Additional Disclosures
Weighted average remaining contractual term of stock options outstanding	4 years 10 months 24 days
Aggregate intrinsic value	$ 1,196,041
Stock options vested and expected to vest (in shares)	268,289
Stock options vested and expected to vest, weighted average exercise price (in dollars per share)	$ 112.80
Weighted average remaining contractual term of stock options expected to vest	4 years 10 months 24 days
Aggregate intrinsic value of stock options expected to vest	$ 1,156,748
Stock options exercisable at the end of the period (in shares)	182,750
Stock options exercisable at the end of the period, weighted average exercise price (in dollars per share)	$ 117.56
Weighted average remaining contractual term of stock options exercisable	3 years 7 months 6 days
Aggregate intrinsic value of stock options exercisable	$ 172,806
Intrinsic value of stock options exercised	$ 2,600,000	$ 2,400,000	$ 2,400,000