Employee Benefit and Deferred Compensation Plans - Plan Expense for Non-Contributory Benefit Pension Plan and Post-Retirement Health and Life Plans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Pension Benefits
Plan expense for noncontributory benefit pension plan and post-retirement health and life plans
Interest cost	$ 227	$ 249	$ 681	$ 746
Expected return on plan assets	(249)	(309)	(745)	(927)
Recognized actuarial loss (gain)	129	131	387	393
Net periodic benefit cost (return)	107	71	323	212
Other Benefits
Plan expense for noncontributory benefit pension plan and post-retirement health and life plans
Interest cost	5	6	16	17
Expected return on plan assets	0	0	0	0
Recognized actuarial loss (gain)	(23)	(15)	(70)	(46)
Net periodic benefit cost (return)	$ (18)	$ (9)	$ (54)	$ (29)