Pension Benefits and Other Postretirement Benefit Plans (Tables)

9 Months Ended

Sep. 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				Nine Months Ended				Three Months Ended				Nine Months Ended
	September 30,				September 30,				September 30,				September 30,
(Dollars in thousands)	2021		2020		2021		2020		2021		2020		2021		2020
Service cost	$	—	$	—	$	—	$	—	$	16	$	17	$	46	$	51
Interest cost	182		223		550		685		7		10		19		30
Expected return of plan assets	(389)		(394)		(1,169)		(1,180)		—		—		—		—
Amortization of prior service credit	—		—		—		—		(25)		(28)		(73)		(84)
Amortization of net loss	95		99		291		327		—		—		—		—
Settlement benefit	—		—		—		(63)		—		—		—		—
Net periodic benefit (credit) cost	$	(112)	$	(72)	$	(328)	$	(231)	$	(2)	$	(1)	$	(8)	$	(3)