Retirement Plans and Other Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2012

Retirement Plans and Other Postretirement Benefits [Abstract]

Components of net periodic benefit cost

	Three Months Ended June 30,
	2012			2011			2012			2011
(Dollars in thousands)	Retirement Plans						Other Post Retirement Benefits
Service cost	$	155		$	184		$	20		$	17
Interest cost		432			433			29			30
Expected return on plan assets		(637	)		(476	)		—			—
Amortization of net loss		287			176			5			—
Accretion of prior service cost		(59	)		(58	)		(5	)		(5	)
Net periodic cost	$	178		$	259		$	49		$	42

	Six Months Ended June 30,
	2012			2011			2012			2011
(Dollars in thousands)	Retirement Plans						Other Post Retirement Benefits
Service cost	$	313		$	278		$	41		$	33
Interest cost		863			863			59			59
Expected return on plan assets		(1,128	)		(948	)		—			—
Amortization of net loss		578			364			11			17
Accretion of prior service cost		(118	)		(117	)		(10	)		(10	)
Net periodic cost	$	508		$	440		$	101		$	99