Pension Benefits, Other Postretirement Benefits and Employee Savings and Investment Plans (Obligations and Funded Status) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension Benefits
Change in plan assets:
Fair value of plan assets as of January 1	$ 33,462,000	$ 35,296,000
Actual return on plan assets	(5,616,000)	(222,000)
Employer contributions	0	0
Benefit payments	(1,546,000)	(1,612,000)
Transfer related to plan termination	0	0
Pension settlements	0	0
Fair value of plan assets as of December 31	26,300,000	33,462,000	$ 35,296,000
Change in plan benefit obligations:
Fair value of plan benefit obligations as of January 1	28,652,000	30,289,000
Service cost	0	0	0
Interest cost	746,000	732,000	908,000
Actuarial (gain) loss	(6,573,000)	(757,000)
Benefit payments	(1,546,000)	(1,612,000)
Pension settlements	0	0
Fair value of plan benefit obligations as of December 31	21,279,000	28,652,000	30,289,000
Amount overfunded (underfunded)	5,021,000	4,810,000
Other Postretirement Benefits
Change in plan assets:
Fair value of plan assets as of January 1	0	0
Actual return on plan assets	0	0
Employer contributions	19,000	165,000
Benefit payments	(19,000)	(165,000)
Transfer related to plan termination	0	0
Pension settlements	0	0
Fair value of plan assets as of December 31	0	0	0
Change in plan benefit obligations:
Fair value of plan benefit obligations as of January 1	1,444,000	1,503,000
Service cost	89,000	41,000	56,000
Interest cost	36,000	26,000	40,000
Actuarial (gain) loss	(109,000)	39,000
Benefit payments	(19,000)	(165,000)
Pension settlements	0	0
Fair value of plan benefit obligations as of December 31	1,441,000	1,444,000	$ 1,503,000
Amount overfunded (underfunded)	$ (1,441,000)	$ (1,444,000)