Stock Award Plans, Director Plan Stock Option Activity (Details)	12 Months Ended
	Dec. 31, 2023 $ / shares shares
2005 Stock and Incentive Plan [Member]
Stock Award Plan Information [Abstract]
Shares available for future grants (in shares)	2,045,694
Director Plan [Member]
Stock Award Plan Information [Abstract]
Shares available for future grants (in shares)	369,360
Director Plan [Member] | Employee Stock Option
Stock Award Plan Information [Abstract]
Term of grant	10 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at Period Start (in shares)	56,480
Granted (in shares)	3,865
Exercised (in shares)	0
Expired (in shares)	(30,000)
Outstanding at Period End (in shares)	30,345
Weighted Average Exercise Price [Abstract]
Outstanding at Period Start (in dollars per share) | $ / shares	$ 86.19
Granted (in dollars per share) | $ / shares	72.83
Exercised (in dollars per share) | $ / shares	0
Expired (in dollars per share) | $ / shares	80.04
Outstanding at Period End (in dollars per share) | $ / shares	$ 90.57
Director Plan [Member] | Restricted Stock [Member]
Stock Award Plan Information [Abstract]
Vesting period	6 months