Defined Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2022

Defined Benefit Plans And Other Postretirement Benefit Plans Disclosures [Abstract]

Schedule of Net Periodic Benefit Costs

The components of net periodic benefit costs from these defined benefit plans are as follows:

	Three Months Ended June 30,
(Dollars in thousands)	Pension Benefits						Other Benefits
	2022			2021			2022			2021
Service cost	$	30		$	33		$	6		$	—
Interest cost		41			40			1			2
Expected return on plan assets		(59	)		(57	)		—			—
Accretion of prior service cost		—			—			(5	)		(5	)
Amortization of net (gain) loss		(2	)		—			1			4
Net periodic benefit expense	$	10		$	16		$	3		$	1
	Six Months Ended June 30,
(Dollars in thousands)	Pension Benefits						Other Benefits
	2022			2021			2022			2021
Service cost	$	72		$	65		$	10		$	1
Interest cost		87			80			18			4
Expected return on plan assets		(118	)		(113	)		—			—
Accretion of prior service cost		—			—			(10	)		(10	)
Amortization of net (gain) loss		(4	)		—			5			4
Settlement gain		—			(49	)		—			—
Net periodic benefit expense (income)	$	37		$	(17	)	$	23		$	(1	)