Stock-Based Compensation, Restricted Shares (Details) - Restricted Shares - 2012 Directors Restricted Stock Plan - USD ($) $ / shares in Units, $ in Millions	3 Months Ended			9 Months Ended	12 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
Stock-Based Compensation
Remaining shares available for the granting of stock options under plan	120,047			120,047
Restricted share activity
Restricted shares outstanding at the beginning of the period (in shares)	21,312	21,061	21,061	21,061
Shares vested and issued (in shares)		(21,061)
Restricted shares granted (in shares)	0	21,312	0
Restricted shares outstanding at the end of the period (in shares)	21,312	21,312	21,061	21,312	21,061
Fair Value at Grant Date
Fair value at the grant date, restricted shares outstanding at the beginning of the period (in dollars per share)	$ 67.59	$ 66.92	$ 66.92	$ 66.92
Fair value of restricted shares vested and issued (in dollars per share)		66.92
Fair value of restricted shares granted (in dollars per share)		67.59
Fair value at the grant date, restricted shares outstanding at the end of the period (in dollars per share)	$ 67.59	$ 67.59	$ 66.92	$ 67.59	$ 66.92
Weighted Average Remaining Amortization Term (in years)	7 months 13 days	10 months 17 days	1 month 17 days		4 months 17 days
Total compensation cost related to non-vested restricted shares not yet recognized (in dollars)	$ 0.9			$ 0.9
Weighted average expected amortization period				7 months 13 days