Retirement Plans and Other Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2015

Compensation and Retirement Disclosure [Abstract]

Components of Net Periodic Benefit Cost (Income)

Components of net periodic benefit cost (income) were as follows:

	Three Months Ended June 30,
	2015			2014			2015		2014
(Dollars in thousands)	Retirement Plans						Other Post Retirement Benefits
Service cost	$	193		$	137		$	14	$	18
Interest cost	488			475			27		31
Expected return on plan assets	(756		)	(745		)	—		—
Amortization of net actuarial loss	326			165			14		2
Accretion of prior service cost	(70		)	(71		)	—		2
Net periodic benefit cost (income)	$	181		$	(39	)	$	55	$	53

	Six Months Ended June 30,
	2015			2014			2015		2014
(Dollars in thousands)	Retirement Plans						Other Post Retirement Benefits
Service cost	$	386		$	273		$	29	$	37
Interest cost	976			950			55		67
Expected return on plan assets	(1,512		)	(1,490		)	—		—
Amortization of net actuarial loss	654			326			27		5
Accretion of prior service cost	(140		)	(141		)	—		(3		)
Net periodic benefit cost (income)	$	364		$	(82	)	$	111	$	106