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Employee Benefit Plans - SERP (Details) - USD ($)	12 Months Ended
Employee Benefit Plans - SERP (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
PENSION AND RETIREMENT PLANS LIABILITIES
Fair value of plan assets	$ 0
Non-qualified Supplemental Retirement Plan ("SERP")
PENSION AND RETIREMENT PLANS LIABILITIES
Variable life insurance policies investment amount	49,300,000	$ 45,400,000
Fair value of plan assets	26,800,000	24,200,000
Trading gains (losses), net	2,600,000	(4,400,000)	$ 2,600,000
Trading gains (losses), net	$ 2,800,000	(4,100,000)	3,100,000
Retirement Income Plan
PENSION AND RETIREMENT PLANS LIABILITIES
Fair value of plan assets		$ 20,041,000	$ 35,339,000

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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