Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2011

Compensation and Retirement Disclosure [Abstract]

Amounts included in Accumulated other comprehensive income, before tax

December 31,	2011			2010
(Dollars in thousands)
Net prior service costs	$	26,173		$	29,988
Net actuarial loss		(39,117	)		(31,426	)
	$	(12,944	)	$	(1,438	)

Amounts included in comprehensive income

Year Ended December 31, 2011		Before-Tax			Deferred Income Tax Benefit (Expense)			Net-of-Tax
(Dollars in thousands)
Net actuarial gains (losses)		$	(9,625	)	$	4,787		$	(4,838	)
Amortization of prior service costs			(3,815	)		1,897			(1,918	)
Amortization of actuarial losses			1,934			(962	)		972
Total gains (losses) recognized
	in Comprehensive income	$	(11,506	)	$	5,722		$	(5,784	)
Year Ended December 31, 2010		Before-Tax			Deferred Income Tax Benefit (Expense)			Net-of-Tax
(Dollars in thousands)
Net actuarial gains (losses)		$	1,180		$	260		$	1,440
Amortization of prior service costs			(3,815	)		(840	)		(4,655	)
Amortization of actuarial losses			2,158			475			2,633
Total gains (losses) recognized
	in Comprehensive income	$	(477	)	$	(105	)	$	(582	)

Funded status of post-retirement benefit plans

December 31,	2011			2010
(Dollars in thousands)
Change in benefit obligation
Benefit obligation at beginning of year	$	44,270		$	42,698
Service cost		1,116			1,175
Interest cost		2,368			2,325
Actuarial (gain) loss		5,158			748
Prescription drug subsidy		263			238
Benefits paid		(3,062	)		(2,914	)
Benefit obligation at end of year		50,113			44,270
Change in plan assets
Fair value of plan assets at beginning of year		45,023			42,407
Actual return (loss) on plan assets		(971	)		5,323
Employer contribution		277			207
Benefits paid		(3,062	)		(2,914	)
Fair value of plan assets at end of year		41,267			45,023
Funded status	$	(8,846	)	$	753

Fair value of plan assets

December 31, 2011
(Dollars in thousands)		Level 1		Level 2		Level 3		Total
Mutual funds
	Bond	$	10,098	$	—	$	—	$	10,098
	International equity		7,304		—		—		7,304
	Money market		2,031		—		—		2,031
	US large cap		18,100		—		—		18,100
	US small cap		3,723		—		—		3,723
Other			—		—		11		11
Total plan assets at fair value		$	41,256	$	—	$	11	$	41,267
December 31, 2010
(Dollars in thousands)			Level 1		Level 2		Level 3		Total
Mutual funds
	Bond	$	11,552	$	—	$	—	$	11,552
	International equity		8,701		—		—		8,701
	Money market		2,090		—		—		2,090
	US large cap		18,619		—		—		18,619
	US small cap		4,030		—		—		4,030
Other			—		—		31		31
Total plan assets at fair value		$	44,992	$	—	$	31	$	45,023

Plan asset investment allocation

				Allocation of Plan Assets
				At December 31,
Investment	Target Asset
Category	Allocation			2011			2010
U.S. equities		50	%		52.9	%		50.3	%
International equities		20	%		17.7	%		19.4	%
Debt securities		30	%		29.4	%		30.3	%

Net periodic benefit cost

Year Ended December 31,	2011			2010			2009
(Dollars in thousands)
Service cost	$	1,116		$	1,175		$	2,140
Interest cost on accumulated post-retirement benefit obligation		2,368			2,325			3,616
Expected return on plan assets		(3,496	)		(3,395	)		(2,800	)
Amortization of prior service costs (1)		(3,815	)		(3,815	)		(801	)
Amortization of actuarial losses (2)		1,934			2,158			1,806
Net post-retirement cost	$	(1,893	)	$	(1,552	)	$	3,961

• Based on straight-line amortization over the average time remaining before active employees become fully eligible for plan benefits.
• Based on straight-line amortization over the average time remaining before active employees retire.

Assumptions used to calculate net periodic benefit cost

December 31,	2011			2010
Benefit obligations
Discount rate		4.70	%		5.50	%
Net periodic benefit cost
Discount rate		5.50	%		5.60	%
Expected return on plan assets		8.00	%		8.25	%

Change in health care cost trend rate

	One Percent
	Increase		Decrease
(Dollars in thousands)
Effect on total service and interest cost components	$	25	$	(24	)
Effect on post-retirement benefit obligation	$	488	$	(466	)

Estimated future post-retirement benefit payments

	Estimated Future
	Post-Retirement
Year	Benefit Payments
(Dollars in thousands)
2012	$	2,455
2013		2,445
2014		2,441
2015		2,374
2016		2,398
2017-2021		16,096