Components of Net Periodic Benefit Cost (Tables)

3 Months Ended

Mar. 31, 2021

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs

	Three Months Ended March 31,
(Dollar amounts in thousands)	Pension Benefits				Post-Retirement Health Benefits
	2021		2020		2021		2020
Service cost	$	339	$	325	$	11	$	10
Interest cost	658		779		26		31
Expected return on plan assets	(1,178)		(1,050)		—		—
Net amortization of prior service cost	—		—		—		—
Net amortization of net (gain) loss	518		492		—		—
Net Periodic Benefit Cost	$	337	$	546	$	37	$	41