Defined Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2021

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
	2021			2020			2021			2020
Service cost	$	33		$	45		$	—		$	1
Interest cost		40			60			2			6
Expected return on plan assets		(57	)		(68	)		—			—
Accretion of prior service cost		—			—			(5	)		(5	)
Amortization of net loss		—			—			4			—
Settlement loss		—			22			—			—
Net periodic benefit expense	$	16		$	59		$	1		$	2
	Six Months Ended June 30,
(Dollars in thousands)	Pension Benefits						Other Benefits
	2021			2020			2021			2020
Service cost	$	65		$	64		$	1		$	1
Interest cost		80			105			4			6
Expected return on plan assets		(113	)		(136	)		—			—
Accretion of prior service cost		—			—			(10	)		(10	)
Amortization of net loss		—			—			4			—
Settlement (gain) loss		(49	)		22			—			—
Net periodic benefit (income) expense	$	(17	)	$	55		$	(1	)	$	(3	)