Components of Net Periodic Benefit Cost (Tables)

6 Months Ended

Jun. 30, 2022

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs

	Three Months Ended June 30,								Six Months Ended June 30,
(Dollar amounts in thousands)	Pension Benefits				Post-Retirement Health Benefits				Pension Benefits				Post-Retirement Health Benefits
	2022		2021		2022		2021		2022		2021		2022		2021
Service cost	$	298	$	338	$	9	$	11	$	595	$	677	$	17	$	22
Interest cost	707		658		27		25		1,413		1,316		55		51
Expected return on plan assets	(1,228)		(1,179)		—		—		(2,455)		(2,357)		—		—
Net amortization of prior service cost	—		—		—		—		—		—		—		—
Net amortization of net (gain) loss	314		518		—		—		629		1,036		—		—
Net Periodic Benefit Cost	$	91	$	335	$	36	$	36	$	182	$	672	$	72	$	73