Common Stock Incentive Plan - Restricted Stock Units Activity (Details)	12 Months Ended
	Dec. 31, 2021 $ / shares shares	Dec. 31, 2020 $ / shares shares	Dec. 31, 2019 $ / shares shares	Nov. 12, 2021
Weighted average price
Conversion ratio				1.002342
Restricted stock units
Number of shares
Outstanding nonvested shares, beginning of year	18,670	15,511	14,968
Equitable adjustment - Orion Divestiture	109	0	0
Shares granted	71,956	9,966	5,482
Shares vested	(23,368)	(6,807)	(4,939)
Shares forfeited	0	0	0
Outstanding nonvested shares, end of each period	67,367	18,670	15,511
Weighted average price
Outstanding nonvested shares, beginning of year (in dollars per share) | $ / shares	$ 70.38	$ 59.82	$ 54.62
Shares granted (in dollars per share) | $ / shares	68.96	78.79	69.58
Shares vested (in dollars per share) | $ / shares	66.96	58.63	54.90
Outstanding nonvested shares, end of each period (in dollars per share) | $ / shares	$ 69.69	$ 70.38	$ 59.82
Stock Option, Restricted Stock Unit, Performance Award
Weighted average price
Conversion ratio				1.002342