Defined Benefit Plans (Tables)

9 Months Ended

Sep. 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 September 30,
(Dollars in thousands)	Pension Benefits						Other Benefits
	2021			2020			2021			2020
Service cost	$	33		$	32		$	1		$	1
Interest cost		40			53			3			3
Expected return on plan assets		(57	)		(68	)		—			—
Accretion of prior service cost		—			—			(5	)		(5	)
Amortization of net loss (gain)		—			—			1			(1	)
Net periodic benefit expense (income)	$	16		$	17		$	—		$	(2	)
	Nine Months Ended September 30,
(Dollars in thousands)	Pension Benefits						Other Benefits
	2021			2020			2021			2020
Service cost	$	98		$	96		$	2		$	2
Interest cost		120			158			7			9
Expected return on plan assets		(170	)		(205	)		—			—
Accretion of prior service cost		—			—			(15	)		(15	)
Amortization of net loss (gain)		—			—			5			(1	)
Settlement (gain) loss		(49	)		22			—			—
Net periodic benefit (income) expense	$	(1	)	$	71		$	(1	)	$	(5	)