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Pension and Supplemental Executive Retirement Plans (Tables)
9 Months Ended
Sep. 30, 2021
Retirement Benefits [Abstract]  
Activity in the Defined Benefit Plan
The following table presents information pertaining to the activity in our defined benefit plan, using the latest available actuarial valuations with a measurement date of September 30, 2021 and 2020 for the periods indicated:
Three Months Ended September 30,Nine Months Ended September 30,
(Dollars in thousands)2021202020212020
Service cost$— $— $— $— 
Interest cost78 91 234 273 
Expected return on plan assets(118)(109)(354)(327)
Amortization of net actuarial loss127 105 381 315 
Amortization of prior service cost— — — — 
     Net periodic benefit cost$87 $87 $261 $261 
Contributions paid$— $119 $3,835 $587