Retirement Plans and Other Postretirement Benefits (Tables)

12 Months Ended

Dec. 31, 2013

Compensation And Retirement Disclosure [Abstract]

Summary of Retirement Plans and Other Postretirement Benefits

Information with respect to the Retirement Plans and Other Postretirement Benefits follows:

	Retirement Plans						Other Postretirement Benefits
(Dollars in thousands)	2013			2012			2013			2012
Change in benefit obligation:
Benefit obligation at beginning of year	$	42,879		$	38,374		$	2,518		$	2,344
Service cost		621			622			86			82
Interest cost		1,712			1,726			118			116
Actuarial (gain) loss		(3,818	)		3,755			(313	)		55
Benefits paid		(1,801	)		(1,598	)		(79	)		(79	)
Benefit obligation at end of year	$	39,593		$	42,879		$	2,330		$	2,518
Change in plan assets:
Fair value of plan assets at beginning of year	$	34,420		$	25,213		$	—		$	—
Actual return on plan assets		5,764			2,669			—			—
Benefits paid		(1,801	)		(1,598	)		(79	)		(79	)
Employer contribution and non-qualified benefit payments		2,164			8,136			79			79
Fair value of plan assets at end of year		40,547			34,420			—			—
Funded status		954			(8,459	)		(2,330	)		(2,518	)
Unrecognized net actuarial loss		14,138			22,576			510			850
Unrecognized prior service costs		(1,590	)		(1,825	)		(7	)		(27	)
Net amount recognized	$	13,502		$	12,292		$	(1,827	)	$	(1,695	)

Information for Pension Plans with Accumulated Benefit Obligation in Excess of Plan Assets

Information for the pension plans with an accumulated benefit obligation in excess of the fair value of plan assets is shown below. The accumulated benefit obligation did not exceed the fair value of plan assets at December 31, 2013 but is shown for comparative purposes.

	At December 31,
(Dollars in thousands)	2013		2012
Projected benefit obligation	$	37,912	$	41,459
Accumulated benefit obligation		36,683		39,912
Fair value of plan assets		40,547		34,420

Components of Net Periodic Benefit Cost

The components of net periodic benefit cost were as follows:

	Retirement Plans									Other Postretirement Benefits
(Dollars in thousands)	2013			2012			2011			2013			2012			2011
Service cost	$	621		$	622		$	556		$	86		$	82		$	66
Interest cost		1,712			1,726			1,725			118			116			117
Expected return on plan assets		(2,527	)		(2,254	)		(1,895	)		—			—			—
Amortization of net actuarial loss		1,259			1,147			728			23			23			15
Accretion of prior service cost		(235	)		(235	)		(235	)		(20	)		(20	)		(20	)
Net periodic benefit cost	$	830		$	1,006		$	879		$	207		$	201		$	178

Expected Amortization Expense

(Dollars in thousands)	Retirement Plans			Other Postretirement Benefits
Expected amortization expense for 2014:
Amortization of net actuarial loss	$	648		$	23
Accretion of prior service cost		(280	)		(20	)

Summary of Benefit Payments Expected to be Paid

The following benefit payments, which reflect expected future service, as appropriate, are expected to be paid:

(Dollars in thousands)	Retirement Plans		Other Postretirement Benefits
For the fiscal year ending:
2014	$	1,927	$	94
2015		2,136		97
2016		2,242		98
2017		2,277		98
2018		2,202		99
Years 2019-2023		11,200		521

Weighted-Average Assumptions Used to Determine Benefit Obligations

Weighted-average assumptions used to determine benefit obligations at December 31, 2013 and 2012 were as follows:

	Retirement Plans						Other Postretirement Benefits
	2013			2012			2013			2012
Assumed discount rate		4.9	%		4.0	%		4.9	%		4.0	%
Assumed salary increase rate		3.0			3.0			—			—

Weighted-average assumptions used to determine net periodic costs for the years ended December 31, 2013 and 2012 were as follows:

	Retirement Plans						Other Postretirement Benefits
	2013			2012			2013			2012
Assumed discount rate		4.0	%		4.5	%		4.0	%		4.5	%
Assumed long-term rate of investment return		7.5			8.0			—			—
Assumed salary increase rate		3.0			3.0			—			—

Summary of Assumed Health Care Cost Trend Rates

Assumed Health Care Cost Trend Rates	2013			2012			2011
Health care cost trend rate assumed for next year		6.5	%		6.5	%		6.5	%
Rate to which the cost trend rate is assumed to decline		5.0			5.0			5.0
Year that the rate reaches the ultimate rate		2015			2014			2013

Effect of One Percentage-Point Change in Assumed Health Care Cost Trend Rates

A one-percentage-point change in the assumed health care cost trend rates would have the following effects:

	One Percentage Point
(Dollars in thousands)	Increase		Decrease
Effect on total of service and interest cost components	$	7	$	(6	)
Effect on postretirement benefit obligation		92		(81	)

Summary of Corporation's Pension Plan Asset Allocation

The Corporation’s pension plan asset allocation at December 31, 2013 and 2012, by asset category was as follows:

	Percentage of Plan Assets at December 31,
	2013			2012
Asset Category:
Equity securities		64	%		59	%
Debt securities		35			38
Other		1			3
Total		100	%		100	%

Major Categories of Assets in Corporation's Pension Plan

The major categories of assets in the Corporation’s pension plan at year-end are presented in the following table. Assets are segregated by the level of the valuation inputs within the fair value hierarchy described in Note 18, “Fair Value Disclosures.”

	Fair Value Measurements at December 31,
(Dollars in thousands)	2013		2012
Level 1:
Mutual funds:
U.S. Large Cap	$	16,710	$	12,880
U.S. Mid Cap		2,169		1,649
U.S. Small Cap		2,341		1,675
International		4,634		4,164
Income		686		899
Short-term investments		650		916
Level 2:
U.S. government obligations		3,790		2,834
Corporate bonds		5,228		4,900
Level 3:
Certificates of deposit		4,339		4,503
Total fair value of plan assets	$	40,547	$	34,420

Reconciliation of Beginning and Ending Balances for Measurements in Hierarchy Level 3

The following table provides a reconciliation of the beginning and ending balances for measurements in hierarchy Level 3 at December 31, 2013 and 2012:

(Dollars in thousands)	Balance at December 31, 2012		Total Unrealized Gains or (Losses)		Total Realized Gains or (Losses)			Purchases		Maturities / Redemptions			Balance at December 31, 2013
Certificates of deposit	$	4,503	$	—	$	—		$	280	$	(444)		$	4,339
Total Level 3 assets	$	4,503	$	—	$	—		$	280	$	(444)		$	4,339
(Dollars in thousands)	Balance at December 31, 2011		Total Unrealized Gains or (Losses)		Total Realized Gains or (Losses)			Purchases		Maturities / Redemptions			Balance at December 31, 2012
Certificates of deposit	$	3,589	$	—	$	(9	)	$	2,279	$	(1,356	)	$	4,503
Total Level 3 assets	$	3,589	$	—	$	(9	)	$	2,279	$	(1,356	)	$	4,503