Retirement Plans and Other Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2022

Retirement Benefits [Abstract]

Components of Net Periodic Benefit Cost (Income)

Information with respect to the Retirement Plans and Other Postretirement Benefits follows: 

	Three Months Ended June 30,
	2022		2021		2022		2021
(Dollars in thousands)	Retirement Plans				Other Post Retirement Benefits
Service cost	$	142	$	131	$	32	$	35
Interest cost	397		353		24		22
Expected loss on plan assets	(945)		(901)		—		—
Amortization of net actuarial loss	205		317		13		12
Net periodic benefit (income) cost	$	(201)	$	(100)	$	69	$	69

	Six Months Ended June 30,
	2022		2021		2022		2021
(Dollars in thousands)	Retirement Plans				Other Post Retirement Benefits
Service cost	$	279	$	261	$	62	$	71
Interest cost	787		707		48		43
Expected return on plan assets	(1,878)		(1,793)		—		—
Amortization of net actuarial loss	409		634		27		24
Net periodic benefit (income) cost	$	(403)	$	(191)	$	137	$	138