Retirement Plans and Other Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2023

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,
	2023		2022		2023		2022
(Dollars in thousands)	Retirement Plans				Other Post Retirement Benefits
Service cost	$	136	$	142	$	19	$	32
Interest cost	587		397		32		24
Expected loss on plan assets	(761)		(945)		—		—
Amortization of net actuarial loss (gain)	250		205		(4)		13
Net periodic benefit cost (income)	$	212	$	(201)	$	47	$	69

	Six Months Ended June 30,
	2023		2022		2023		2022
(Dollars in thousands)	Retirement Plans				Other Post Retirement Benefits
Service cost	$	266	$	279	$	38	$	62
Interest cost	1,184		787		64		48
Expected loss on plan assets	(1,531)		(1,878)		—		—
Amortization of net actuarial loss (gain)	500		409		(8)		27
Net periodic benefit cost (income)	$	419	$	(403)	$	94	$	137