Pension Benefits and Other Postretirement Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2021

Retirement Benefits [Abstract]

Components of Net Periodic Benefit (Credit) Cost

The components of net periodic benefit (credit) cost were as follows:

	Pension Benefits				Other Postretirement Benefits
	Three Months Ended				Three Months Ended
	March 31,				March 31,
(Dollars in thousands)	2021		2020		2021		2020
Service cost	$	—	$	—	$	15	$	17
Interest cost	184		231		6		10
Expected return of plan assets	(390)		(393)		—		—
Amortization of prior service credit	—		—		(24)		(28)
Amortization of net loss	98		114		—		—
Net periodic benefit (credit) cost	$	(108)	$	(48)	$	(3)	$	(1)