Retirement Plans and Other Postretirement Benefits (Tables)

9 Months Ended

Sep. 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 September 30,
	2023		2022		2023		2022
(Dollars in thousands)	Retirement Plans				Other Post Retirement Benefits
Service cost	$	133	$	140	$	19	$	30
Interest cost	590		393		32		25
Expected loss on plan assets	(762)		(940)		—		—
Amortization of net actuarial loss (gain)	250		205		(3)		14
Net periodic benefit cost (income)	$	211	$	(202)	$	48	$	69

	Nine Months Ended September 30,
	2023		2022		2023		2022
(Dollars in thousands)	Retirement Plans				Other Post Retirement Benefits
Service cost	$	399	$	419	$	57	$	92
Interest cost	1,774		1,180		96		73
Expected loss on plan assets	(2,293)		(2,818)		—		—
Amortization of net actuarial loss (gain)	750		614		(11)		41
Net periodic benefit cost (income)	$	630	$	(605)	$	142	$	206