Retirement Plans and Other Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2012

Retirement Plans and Other Postretirement Benefits [Abstract]

Components of net periodic benefit cost

	Three Months Ended September 30,
	2012			2011			2012			2011
(Dollars in thousands)	Retirement Plans						Other Post Retirement Benefits
Service cost	$	156		$	138		$	21		$	16
Interest cost		431			431			29			29
Expected return on plan assets		(564	)		(474	)		—			—
Amortization (accretion) of net loss/gain		287			185			6			(5	)
Accretion of prior service cost		(58	)		(59	)		(6	)		(6	)
Net periodic cost	$	252		$	221		$	50		$	34

	Nine Months Ended September 30,
	2012			2011			2012			2011
(Dollars in thousands)	Retirement Plans						Other Post Retirement Benefits
Service cost	$	469		$	416		$	62		$	49
Interest cost		1,294			1,294			88			88
Expected return on plan assets		(1,692	)		(1,422	)		—			—
Amortization of net loss		865			549			17			12
Accretion of prior service cost		(176	)		(176	)		(16	)		(16	)
Net periodic cost	$	760		$	661		$	151		$	133