Pension Benefits and Other Postretirement Benefit Plans (Tables)

6 Months Ended

Jun. 30, 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				Six Months Ended				Three Months Ended				Six Months Ended
	June 30,				June 30,				June 30,				June 30,
(Dollars in thousands)	2021		2020		2021		2020		2021		2020		2021		2020
Service cost	$	—	$	—	$	—	$	—	$	15	$	17	$	30	$	34
Interest cost	184		231		368		462		6		10		12		20
Expected return of plan assets	(390)		(393)		(780)		(786)		—		—		—		—
Amortization of prior service credit	—		—		—		—		(24)		(28)		(48)		(56)
Amortization of net loss	98		114		196		228		—		—		—		—
Settlement benefit	—		(63)		—		(63)		—		—		—		—
Net periodic benefit (credit) cost	$	(108)	$	(111)	$	(216)	$	(159)	$	(3)	$	(1)	$	(6)	$	(2)