Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2012

Benefit Plans [Abstract]

Net periodic postretirement benefit cost

	Six months ended June 30, (Dollars in thousands)
	2012		2011
Components of net periodic cost:
Service cost	$	4	$	4
Interest cost		18		18
Prior service cost		—		—
Amortization of (gain) loss		6		—
Net periodic postretirement benefit cost	$	28	$	22

	Three months ended June 30, (Dollars in thousands)
	2012		2011
Components of net periodic cost:
Service cost	$	2	$	2
Interest cost		9		9
Prior service cost		—		—
Amortization of (gain) loss		3		—
Net periodic postretirement benefit cost	$	14	$	11