Qualified Employee Benefit Plans - Actuarial Computations Used to Determine Net Periodic Costs (Details) - Retirement Plan	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Assumptions used to determine net periodic benefit costs [Abstract]
Discount rate on benefit obligations	5.50%	2.90%	2.55%
Expected long-term rate of return on plan assets	5.25%	5.25%	5.25%