Retirement Benefits (Tables)

12 Months Ended

Dec. 31, 2011

Retirement Benefits [Abstract]

Schedule of Changes in Projected Benefit Obligations

Following is a summary of the projected benefit obligation as of December 31, 2011 and 2010:

(Dollars in thousands)	2011		2010
Projected benefit obligation:
Beginning of year	$	51,828	$	45,889
Interest cost	2,716		2,675
Actuarial loss	2,243		3,264
End of year	$	56,787	$	51,828

Schedule of Amounts Recognized in Other Comprehensive Income (Loss)

Following is a summary of the amounts recognized in accumulated other comprehensive income (loss) as of December 31, 2011 and 2010:

(Dollars in thousands)	2011		2010
Net actuarial loss	$	10,007	$	9,093
Prior service cost	12,035		15,059
Net pension asset	$	22,042	$	24,152

Schedule of Net Benefit Costs

The components of net periodic pension benefit cost are as follows:

(Dollars in thousands)	2011		2010		2009
Components of net periodic benefit cost:
Interest cost	$	2,716	$	2,675	$	2,631
Amortization of unrecognized:
Prior service costs	3,023		3,023		3,023
Net actuarial loss	1,330		424		—
Net periodic pension cost	$	7,069	$	6,122	$	5,654

Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss)

The changes in plan assets and projected benefit obligation recognized in other comprehensive income (loss) are as follows:

(Dollars in thousands)	2011			2010
Changes in plan assets and projected benefit obligation:
Net actuarial loss	$	2,243		$	3,264
Amortization of:
Net actuarial loss	(1,330		)	(424		)
Prior service costs	(3,023		)	(3,023		)
Total recognized in other comprehensive income (loss)	$	(2,110	)	$	(183	)