Defined Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2019

Defined Benefit Pension Plans And Defined Benefit Postretirement Plans Disclosure [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
	2019			2018			2019			2018
Service cost	$	36		$	153		$	1		$	1
Interest cost		65			205			4			5
Expected return on plan assets		(63	)		(211	)		—			—
Amortization (accretion) of prior service cost		—			4			(5	)		(5	)
Amortization of net (gain) or loss		(15	)		—			(1	)		—
Settlement gain		(37	)		(380	)		—			—
Net periodic benefit (income) expense	$	(14	)	$	(229	)	$	(1	)	$	1
	Six Months Ended June 30,
(Dollars in thousands)	Pension Benefits						Other Benefits
	2019			2018			2019			2018
Service cost	$	72		$	161		$	2		$	2
Interest cost		129			215			8			9
Expected return on plan assets		(127	)		(211	)		—			—
Amortization (accretion) of prior service cost		—			8			(10	)		(10	)
Amortization of net (gain) or loss		(30	)		—			(2	)		—
Settlement gain		(37	)		(380	)		—			—
Net periodic benefit expense (income)	$	7		$	(207	)	$	(2	)	$	1

Service costs are reported as a component of salaries and employee benefits on the Consolidated Statements of Income, while interest costs, expected return on plan assets, amortization (accretion) of prior service cost, and amortization of (gain) loss are reported as a component of other income.