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Share-Based Compensation - Restricted Stock (Details) - Restricted Stock	9 Months Ended
	Sep. 30, 2021 USD ($) $ / shares shares
Restricted Stock Activity
Outstanding at the beginning of the period (in shares) | shares	11,004
Vested (in shares) | shares	(4,168)
Outstanding at the end of the period (in shares) | shares	6,836
Weighted-Average Grant-Date Fair Value
Outstanding at the beginning of the period (in dollars per share) | $ / shares	$ 59.42
Vested (in dollars per share) | $ / shares	52.95
Outstanding at the end of the period (in dollars per share) | $ / shares	$ 63.37
Additional disclosures
Total unrecognized compensation cost related to nonvested restricted stock and RSUs granted | $	$ 206,440
Weighted-average period over which unrecognized compensation cost is expected to be recognized	1 year 8 months 15 days
Total fair value of shares vested during the period | $	$ 220,696
Employees
Share-Based Compensation
Vesting period	4 years
Non-employee directors
Share-Based Compensation
Vesting period	12 months

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