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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Costs of Retirement Plans
The following summarizes the Corporation’s expense under its retirement plans for the years ended December 31:
 
2015
 
2014
 
2013
 
(in thousands)
401(k) Retirement Plan
$
6,423

 
$
8,643

 
$
11,807

Pension Plan
4,102

 
1,514

 
2,477

 
$
10,525

 
$
10,157

 
$
14,284
Pension Plans  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Summary of Pension Plan and Postretirement Plan Net Periodic Benefit Cost
The net periodic pension cost for the Pension Plan, as determined by consulting actuaries, consisted of the following components for the years ended December 31:
 
2015
 
2014
 
2013
 
(in thousands)
Service cost (1)
$
579

 
$
367

 
$
202

Interest cost
3,405

 
3,413

 
3,087

Expected return on assets
(3,009
)
 
(3,240
)
 
(3,194
)
Net amortization and deferral
3,127

 
974

 
2,382

Net periodic pension cost
$
4,102

 
$
1,514

 
$
2,477

 
(1)
The Pension Plan was curtailed effective January 1, 2008. Pension plan service cost for all years presented was related to administrative costs associated with the plan and not due to the accrual of additional participant benefits.
Schedule of Changes in Accumulated Postemployment Benefit Obligations
The following table summarizes the changes in the projected benefit obligation and fair value of plan assets for the plan years ended December 31:
 
2015
 
2014
 
(in thousands)
Projected benefit obligation at beginning of year
$
93,079

 
$
73,362

Service cost
579

 
367

Interest cost
3,405

 
3,413

Benefit payments
(3,904
)
 
(5,164
)
Change due to change in assumptions
(7,722
)
 
22,055

Experience gain
(701
)
 
(954
)
Projected benefit obligation at end of year
$
84,736

 
$
93,079

 
 
 
 
Fair value of plan assets at beginning of year
$
51,730

 
$
55,448

Actual return on assets
(855
)
 
1,446

Benefit payments
(3,904
)
 
(5,164
)
Fair value of plan assets at end of year
$
46,971

 
$
51,730
Schedule of Net Funded Status
The following table presents the funded status of the Pension Plan, included in other liabilities on the consolidated balance sheets, as of December 31:
 
2015
 
2014
 
(in thousands)
Projected benefit obligation
$
(84,736
)
 
$
(93,079
)
Fair value of plan assets
46,971

 
51,730

Funded status
$
(37,765
)
 
$
(41,349
)
Schedule Of Changes In Unrecognized Pension And Postretirement Items
The following table summarizes the changes in the unrecognized net loss included as a component of accumulated other comprehensive loss:
 
Unrecognized Net Loss 
 
Gross of tax
 
Net of tax
 
(in thousands)
Balance as of December 31, 2013
$
16,161

 
$
10,505

Recognized as a component of 2014 periodic pension cost
(974
)
 
(633
)
Unrecognized losses arising in 2014
22,895

 
14,882

Balance as of December 31, 2014
38,082

 
24,754

Recognized as a component of 2015 periodic pension cost
(3,127
)
 
(2,033
)
Unrecognized gains arising in 2015
(4,559
)
 
(2,963
)
Balance as of December 31, 2015
$
30,396

 
$
19,758
Schedule Of Rates Used To Calculate Net Periodic Pension Costs And Present Value Of Benefit Obligations
The following rates were used to calculate net periodic pension cost and the present value of benefit obligations as of December 31:
 
2015
 
2014
 
2013
Discount rate-projected benefit obligation
4.25
%
 
3.75
%
 
4.75
%
Expected long-term rate of return on plan assets
6.00
%
 
6.00
%
 
6.00
%
Schedule of Allocation of Plan Assets
The following table presents a summary of the fair values of the Pension Plan’s assets as of December 31:
 
2015
 
2014
 
Estimated
Fair Value
 
% of Total
Assets
 
Estimated
Fair Value
 
% of Total
Assets
 
(dollars in thousands)
Equity mutual funds
$
8,269

 

 
$
8,503

 

Equity common trust funds
6,350

 

 
6,018

 

Equity securities
14,619

 
31.1
%
 
14,521

 
28.1
%
Cash and money market funds
8,196

 

 
8,957

 

Fixed income mutual funds
9,578

 

 
9,845

 

Corporate debt securities
3,749

 

 
4,971

 

U.S. Government agency securities
2,881

 


 
3,856

 


Fixed income securities and cash
24,404

 
52.0
%
 
27,629

 
53.4
%
Other alternative investment funds
7,948

 
16.9
%
 
9,580

 
18.5
%

$
46,971

 
100.0
%
 
$
51,730

 
100.0
%
Schedule of Expected Benefit Payments
Estimated future benefit payments are as follows (in thousands):
Year
 
2016
$
3,125

2017
3,367

2018
3,727

2019
3,838

2020
4,227

2021 – 2025
23,903

 
$
42,187
Other Postretirement Benefit Plans  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Summary of Pension Plan and Postretirement Plan Net Periodic Benefit Cost

The components of the expense for postretirement benefits other than pensions are as follows:
 
2015
 
2014
 
2013
 
(in thousands)
Service cost
$
—

 
$
15

 
$
228

Interest cost
206

 
206

 
322

Expected return on plan assets
—

 
—

 
(1
)
Net amortization and deferral
(258
)
 
(347
)
 
(363
)
Net postretirement benefit cost
$
(52
)
 
$
(126
)
 
$
186
Schedule of Changes in Accumulated Postemployment Benefit Obligations


The following table summarizes the changes in the accumulated postretirement benefit obligation and fair value of plan assets for the years ended December 31:
 
2015
 
2014
 
(in thousands)
Accumulated postretirement benefit obligation at beginning of year
$
5,552

 
$
8,169

Service cost
—

 
15

Interest cost
206

 
206

Benefit payments
(251
)
 
(209
)
Experience gain
189

 
(532
)
Change due to change in assumptions
(2,821
)
 
1,261

Effect of curtailment
—

 
(3,358
)
Accumulated postretirement benefit obligation at end of year
$
2,875

 
$
5,552

 
 
 
 
Fair value of plan assets at beginning of year
$
8

 
$
23

Employer contributions
258

 
194

Benefit payments
(251
)
 
(209
)
Fair value of plan assets at end of year
$
15

 
$
8
Schedule of Net Funded Status


The following table presents the funded status of the Postretirement Plan, included in other liabilities on the consolidated balance sheets as of December 31:
 
2015
 
2014
 
(in thousands)
Accumulated postretirement benefit obligation
$
(2,875
)
 
$
(5,552
)
Fair value of plan assets
15

 
8

Funded status
$
(2,860
)
 
$
(5,544
)
Schedule Of Changes In Unrecognized Pension And Postretirement Items
The following table summarizes the changes in items recognized as a component of accumulated other comprehensive loss:
 
Gross of tax
 
 
 
Unrecognized
Prior Service
Cost
 
Unrecognized
Net Loss (Gain)
 
Total
 
Net of tax
 
(in thousands)
Balance as of December 31, 2013
$
(1,484
)
 
$
(1,137
)
 
$
(2,621
)
 
$
(1,704
)
Recognized as a component of 2014 postretirement benefit cost, prior to curtailment
32

 
10

 
42

 
26

Unrecognized gains arising in 2014, prior to curtailment
—

 
(313
)
 
(313
)
 
(203
)
Curtailment gain
1,452

 
—

 
1,452

 
944

Recognized as a component of 2014 postretirement benefit cost, after curtailment
235

 
70

 
305

 
199

Unrecognized gains arising in 2014, after curtailment
(3,358
)
 
1,034

 
(2,324
)
 
(1,511
)
Balance as of December 31, 2014
(3,123
)
 
(336
)
 
(3,459
)
 
(2,249
)
Recognized as a component of 2015 postretirement benefit cost
258

 
—

 
258

 
168

Unrecognized gains arising in 2015
(2,469
)
 
(172
)
 
(2,641
)
 
(1,717
)
Balance as of December 31, 2015
$
(5,334
)
 
$
(508
)
 
$
(5,842
)
 
$
(3,798
)
Schedule Of Rates Used To Calculate Net Periodic Pension Costs And Present Value Of Benefit Obligations
The following rates were used to calculate net periodic postretirement benefit cost and the present value of benefit obligations as of December 31:
 
2015
 
2014
 
2013
Discount rate-projected benefit obligation
4.25
%
 
3.75
%
 
4.75
%
Expected long-term rate of return on plan assets
3.00
%
 
3.00
%
 
3.00
%
Schedule of Expected Benefit Payments
Estimated future benefit payments under the Postretirement Plan are as follows (in thousands):
Year
 
2016
$
342

2017
317

2018
296

2019
275

2020
255

2021 – 2025
995

 
$
2,480