Pension and Retirement Plans (Tables)

9 Months Ended

Sep. 30, 2023

Retirement Benefits [Abstract]

Components of Net Periodic Benefit Cost (Credit)

The components of net periodic benefit cost (credit) were as follows:

	Three Months Ended September 30,
	Pension Plan						Supplemental Retirement Plan				Retirement Healthcare Plan
	2023			2022			2023		2022		2023			2022
	(dollars in thousands)
Net periodic benefit cost (credit)
Service cost	$	—		$	—		$	68	$	100	$	5		$	6
Interest cost		451			328			100		65		7			4
Expected return on assets		(801	)		(968	)		—		—		—			—
Amortization of net actuarial (gain) loss		—			—			—		7		(5	)		—
Net periodic benefit cost (credit)	$	(350	)	$	(640	)	$	168	$	172	$	7		$	10

	Nine Months Ended September 30,
	Pension Plan						Supplemental Retirement Plan				Retirement Healthcare Plan
	2023			2022			2023		2022		2023			2022
	(dollars in thousands)
Net periodic benefit cost (credit)
Service cost	$	—		$	—		$	204	$	299	$	13		$	20
Interest cost		1,354			982			300		195		18			14
Expected return on assets		(2,403	)		(2,907	)		—		—		—			—
Amortization of net actuarial (gain) loss		—			—			—		21		(16	)		—
Net periodic benefit cost (credit)	$	(1,049	)	$	(1,925	)	$	504	$	515	$	15		$	34