Retirement Plans and Other Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2013

Compensation And Retirement Disclosure [Abstract]

Components of Net Periodic Benefit Cost

Components of net periodic benefit cost were as follows:

	Three Months Ended September 30,
	2013			2012			2013			2012
(Dollars in thousands)	Retirement Plans						Other Post Retirement Benefits
Service cost	$	155		$	156		$	23		$	21
Interest cost		427			431			30			29
Expected return on plan assets		(630	)		(564	)		—			—
Amortization of net loss		314			287			6			6
Accretion of prior service cost		(58	)		(58	)		(6	)		(6	)
Net periodic benefit cost	$	208		$	252		$	53		$	50

	Nine Months Ended September 30,
	2013			2012			2013			2012
(Dollars in thousands)	Retirement Plans						Other Post Retirement Benefits
Service cost	$	466		$	469		$	69		$	62
Interest cost		1,284			1,294			86			88
Expected return on plan assets		(1,894	)		(1,692	)		—			—
Amortization of net loss		943			865			18			17
Accretion of prior service cost		(176	)		(176	)		(15	)		(16	)
Net periodic benefit cost	$	623		$	760		$	158		$	151