Employee Benefits (Tables)

9 Months Ended

Sep. 30, 2017

Retirement Benefits [Abstract]

Components of Net Periodic Pension Cost and Other Changes in Plan Assets and Benefit

The following table summarizes the components of net periodic pension cost for the periods presented:

	Three Months Ended September 30,						Nine Months Ended September 30,
(dollars in thousands)	2017			2016			2017			2016
Components of Net Periodic Pension Cost
Service cost—benefits earned during the period	$	—		$	(6	)	$	—		$	469
Interest cost on projected benefit obligation	1,025			1,099			3,075			3,200
Expected return on plan assets	(1,582		)	(1,444		)	(4,746		)	(4,337		)
Amortization of prior service credit	475			29			1,424			(41		)
Recognized net actuarial loss	—			638			—			1,708
Net Periodic Pension Expense	$	(82	)	$	316		$	(247	)	$	999