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Components of Net Periodic Benefit Cost (Tables)
3 Months Ended
Mar. 31, 2022
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs
Three Months Ended March 31,
(Dollar amounts in thousands)Pension BenefitsPost-Retirement
Health Benefits
 2022202120222021
Service cost$297 $339 $$11 
Interest cost706 658 28 26 
Expected return on plan assets(1,227)(1,178)— — 
Net amortization of prior service cost— — — — 
Net amortization of net (gain) loss315 518 — — 
Net Periodic Benefit Cost$91 $337 $36 $37