Employee Benefit Plans (Obligation and Funded Status of Pension and Postretirement Plans) (Details) - Postretirement health care benefit plan - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Change in benefit obligation
Benefit obligation at beginning of year	$ 17,266,000	$ 17,433,000
Service cost	133,000	151,000	$ 248,000
Interest cost	785,000	830,000	586,000
Actuarial (gains) losses	(911,000)	(66,000)
Participant contributions	227,000	257,000
Benefits paid	(1,573,000)	(1,339,000)
Benefit obligation at end of year	15,927,000	17,266,000	17,433,000
Change in plan assets
Fair value of plan assets at beginning of year	0	0
Company contributions	1,346,000	1,082,000
Participant contributions	227,000	257,000
Benefits paid	(1,573,000)	(1,339,000)
Fair value of plan assets at end of year	0	0	$ 0
Underfunded status of plans at end of year	$ (15,927,000)	$ (17,266,000)