Defined Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2014

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Schedule of Costs of Retirement Plans

The components of net periodic pension and postretirement benefit costs for the three and nine months ended September 30, 2014 and 2013 are as follows:

	Pension Plans												Other Postretirement Benefits
	Three months ended September 30,						Nine months ended September 30,						Three months ended September 30,						Nine months ended September 30,
	2014			2013			2014			2013			2014			2013			2014			2013
	(dollars in thousands)
Service costs	$	190		$	170		$	570		$	520		$	—		$	—		$	—		$	—
Interest costs	450			410			1,330			1,230			10			10			30			30
Expected return on plan assets	(510		)	(460		)	(1,550		)	(1,380		)	—			—			—			—
Amortization of prior service cost	—			—			10			10			—			—			—			—
Amortization of net (gain)/loss	270			320			830			960			(20		)	(20		)	(70		)	(60		)
Net periodic benefit cost	$	400		$	440		$	1,190		$	1,340		$	(10	)	$	(10	)	$	(40	)	$	(30	)