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Employee Benefit Plans (Tables)
9 Months Ended
Sep. 30, 2023
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures
The net periodic pension cost for the Pension Plan consisted of the following components:
Three months ended September 30Nine months ended September 30
 2023202220232022
 (dollars in thousands)
Interest cost$856 $599 $2,567 $1,795 
Expected return on plan assets(878)(1,098)(2,632)(3,295)
Net amortization and deferral81 163 242 490 
Net periodic pension cost$59 $(336)$177 $(1,010)
The components of the net benefit for the Postretirement Plan consisted of the following components:
Three months ended September 30Nine months ended September 30
 2023202220232022
 (dollars in thousands)
Interest cost$12 $$38 $25 
Net accretion and deferral(137)(132)(409)(394)
Net periodic benefit$(125)$(124)$(371)$(369)