Employee's Pension and Postretirement Benefits - Summary of Accumulated Other Comprehensive (Loss) Income and Components of Net Periodic Benefit Cost in Future Periods (Details) - SERP Benefits [Member] - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Components of net periodic benefit cost in future periods
Unrealized actuarial (gain) loss	$ (2,889)	$ (3,580)	$ (679)
Unamortized prior service cost			184
Net periodic benefit costs to be recognized in future periods	$ (2,889)	$ (3,580)	$ (495)

Employee's Pension and Postretirement Benefits - Summary of Accumulated Other Comprehensive (Loss) Income and Components of Net Periodic Benefit Cost in Future Periods (Details) - SERP Benefits [Member] - USD ($)
$ in Thousands

Dec. 31, 2023

Dec. 31, 2022

Dec. 31, 2021

Components of net periodic benefit cost in future periods

Unrealized actuarial (gain) loss

$ (2,889)

$ (3,580)

$ (679)

Unamortized prior service cost

184

Net periodic benefit costs to be recognized in future periods

$ (2,889)

$ (3,580)

$ (495)