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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2020
Retirement Benefits [Abstract]  
Actuarial Assumptions Used to Determine the Actuarial Present Value of Projected Benefit Obligations The following table presents the weighted-average actuarial assumptions used to determine the actuarial present value of projected benefit obligations at:
 DECEMBER 31,
 20202019
Discount rate2.00 %2.75 %
Rate of future compensation increase2.90 %2.90 %
Actuarial Assumptions Used to Determine Net Periodic Benefit Cost
The following table presents the weighted-average actuarial assumptions used to determine net periodic benefit cost for the years ended:
 DECEMBER 31,
 202020192018
Discount rate2.75 %4.00 %3.25 %
Rate of future compensation increase2.90 %2.90 %2.90 %
Components of Net Periodic Benefit Cost
The following table presents the components of net periodic benefit cost for the years ended (in thousands):
 DECEMBER 31,
 202020192018
Service cost$345 $261 $1,353 
Interest cost497 601 468 
Net periodic benefit cost$842 $862 $1,821 
Changes in the Benefit Obligation
The following table presents the changes in the projected benefit obligation for the years ended (in thousands):
 DECEMBER 31,
 20202019
Projected benefit obligation, beginning$18,080 $15,035 
Service cost345 261 
Interest cost497 601 
Actuarial experience and changes in actuarial assumptions1,706 2,183 
Projected benefit obligation, ending$20,628 $18,080 
Projected Annual Benefit Payment Undiscounted projected benefit payments attributed to the SERP, which reflect the anticipated future service of participants, are expected to be paid as follows during the years ended December 31 (in thousands):
 Projected Annual
Benefit Payments
2021$— 
202215,231 
2023— 
2024— 
2025— 
2025-20309,736