Retirement Plans and Other Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2013

Retirement Plans and Other Postretirement Benefits [Abstract]

Components of net periodic benefit cost

	Three Months Ended March 31,
	2013			2012			2013			2012
(Dollars in thousands)	Retirement Plans						Other Post  Retirement Benefits
Service cost	$	156		$	158		$	21		$	21
Interest cost		431			431			29			30
Expected return on plan assets		(555	)		(491	)		—			—
Amortization of net loss		286			291			6			6
Accretion of prior service cost		(59	)		(59	)		(5	)		(5	)
Net periodic benefit cost	$	259		$	330		$	51		$	52