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
	Mar. 31, 2025	Mar. 31, 2024
Pension Benefits
Plan expense for noncontributory benefit pension plan and post-retirement health and life plans
Interest cost	$ 237	$ 227
Expected return on plan assets	(267)	(248)
Recognized actuarial loss (gain)	121	129
Net periodic benefit cost (return)	91	108
Other Benefits
Plan expense for noncontributory benefit pension plan and post-retirement health and life plans
Interest cost	5	5
Expected return on plan assets	0	0
Recognized actuarial loss (gain)	(22)	(23)
Net periodic benefit cost (return)	$ (17)	$ (18)