Retirement Plans, Summary of Change in Plan Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Pension Plan [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	$ 375,917	$ 341,061
Actual return on plan assets	49,450	58,734
Employer contribution	1,654	8,174
Gross benefits paid	(15,572)	(32,052)
Fair value of plan assets at end of year	411,449	375,917
SERP [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Employer contribution	68	153
Gross benefits paid	(68)	(153)
Fair value of plan assets at end of year	0	0
Other Postretirement Benefits [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Employer contribution	36	104
Gross benefits paid	(36)	(104)
Fair value of plan assets at end of year	$ 0	$ 0