Stock Award Plans, Director Plan Stock Option Activity (Details)	12 Months Ended
	Dec. 31, 2022 $ / shares shares
2005 Stock and Incentive Plan [Member]
Stock Award Plan Information [Abstract]
Shares available for future grants (in shares)	2,180,005
Director Plan [Member]
Stock Award Plan Information [Abstract]
Shares available for future grants (in shares)	374,751
Director Plan [Member] | Stock Options [Member]
Stock Award Plan Information [Abstract]
Term of grant	10 years
Outstanding Non-Qualified or Nonincentive Stock Awards [Roll Forward]
Outstanding at Period Start (in shares)	88,980
Exercised (in shares)	(20,500)
Forfeited or expired (in shares)	(12,000)
Outstanding at Period End (in shares)	56,480
Weighted Average Exercise Price [Abstract]
Outstanding at Period Start (in dollars per share) | $ / shares	$ 80.82
Exercised (in dollars per share) | $ / shares	62.19
Expired (in dollars per share) | $ / shares	87.35
Outstanding at Period End (in dollars per share) | $ / shares	$ 86.19
Director Plan [Member] | Restricted Stock [Member]
Stock Award Plan Information [Abstract]
Vesting period	6 months