Common Stock Incentive Plan - Restricted Stock Activity (Details) - Restricted stock awards - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Number of shares
Outstanding nonvested shares, beginning of year (in shares)	242,660	212,630	219,482
Shares granted (in shares)	222,511	156,274	133,052
Shares vested (in shares)	(110,634)	(118,160)	(124,505)
Shares forfeited (in shares)	(7,486)	(8,084)	(15,399)
Outstanding nonvested shares, end of each period (in shares)	347,051	242,660	212,630
Weighted average price
Outstanding nonvested shares, beginning of year (in dollars per share)	$ 67.12	$ 65.20	$ 63.69
Shares granted (in dollars per share)	65.40	67.37	64.27
Shares vested (in dollars per share)	61.28	63.95	61.57
Shares forfeited (in dollars per share)	66.91	67.78	65.09
Outstanding nonvested shares, end of each period (in dollars per share)	$ 67.89	$ 67.12	$ 65.20
Vesting period (in years)	4 years