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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2016
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:
 
2016
 
2015
 
2014
 
(in thousands)
401(k) Retirement Plan
$
7,418

 
$
6,423

 
$
8,643

Pension Plan
4,310

 
4,102

 
1,514

 
$
11,728

 
$
10,525

 
$
10,157
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:
 
2016
 
2015
 
2014
 
(in thousands)
Service cost (1)
$
688

 
$
579

 
$
367

Interest cost
3,520

 
3,405

 
3,413

Expected return on assets
(2,318
)
 
(3,009
)
 
(3,240
)
Net amortization and deferral
2,420

 
3,127

 
974

Net periodic pension cost
$
4,310

 
$
4,102

 
$
1,514

 
(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:
 
2016
 
2015
 
(in thousands)
Projected benefit obligation at beginning of year
$
84,736

 
$
93,079

Service cost
688

 
579

Interest cost
3,520

 
3,405

Benefit payments
(5,172
)
 
(3,904
)
Change in assumptions
1,635

 
(7,722
)
Experience gain
(44
)
 
(701
)
Projected benefit obligation at end of year
$
85,363

 
$
84,736

 
 
 
 
Fair value of plan assets at beginning of year
$
46,971

 
$
51,730

Employer contributions (1)
5,169

 
—

Actual return on plan assets
1,716

 
(855
)
Benefit payments
(5,172
)
 
(3,904
)
Fair value of plan assets at end of year
$
48,684

 
$
46,971


(1) The Corporation funds at least the minimum amount required by the funding requirements of federal law and regulations. The corporation contributed $5.2 million to the Pension Plan during 2016. There were no contributions to the Pension Plan in 2015.
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:
 
2016
 
2015
 
(in thousands)
Projected benefit obligation
$
(85,363
)
 
$
(84,736
)
Fair value of plan assets
48,684

 
46,971

Funded status
$
(36,679
)
 
$
(37,765
)
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, 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

Recognized as a component of 2016 periodic pension cost
(2,420
)
 
(1,573
)
Unrecognized losses arising in 2016
2,193

 
1,425

Balance as of December 31, 2016
$
30,169

 
$
19,610
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:
 
2016
 
2015
 
2014
Discount rate-projected benefit obligation
4.00
%
 
4.25
%
 
3.75
%
Expected long-term rate of return on plan assets
5.00
%
 
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:
 
2016
 
2015
 
Estimated
Fair Value
 
% of Total
Assets
 
Estimated
Fair Value
 
% of Total
Assets
 
(dollars in thousands)
Equity mutual funds
$
12,689

 

 
$
8,269

 

Equity common trust funds
7,936

 

 
6,350

 

Equity securities
20,625

 
42.4
%
 
14,619

 
31.1
%
Cash and money market funds
7,149

 

 
8,196

 

Fixed income mutual funds
10,540

 

 
9,578

 

Corporate debt securities
3,252

 

 
3,749

 

U.S. Government agency securities
496

 


 
2,881

 


Fixed income securities and cash
21,437

 
44.0
%
 
24,404

 
52.0
%
Other alternative investment funds
6,622

 
13.6
%
 
7,948

 
16.9
%

$
48,684

 
100.0
%
 
$
46,971

 
100.0
%
Schedule of Expected Benefit Payments
Estimated future benefit payments are as follows (in thousands):
Year
 
2017
$
3,409

2018
3,742

2019
3,831

2020
4,213

2021
4,410

2022 – 2026
24,219

 
$
43,824
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 net (benefit) expense for postretirement benefits other than pensions are as follows:
 
2016
 
2015
 
2014
 
(in thousands)
Service cost
$
—

 
$
—

 
$
15

Interest cost
85

 
206

 
206

Net amortization and deferral
(551
)
 
(258
)
 
(347
)
Net postretirement benefit cost
$
(466
)
 
$
(52
)
 
$
(126
)
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:
 
2016
 
2015
 
(in thousands)
Accumulated postretirement benefit obligation at beginning of year
$
2,875

 
$
5,552

Interest cost
85

 
206

Benefit payments
(282
)
 
(251
)
Experience gain
(732
)
 
189

Change in assumptions
(20
)
 
(2,821
)
Accumulated postretirement benefit obligation at end of year
$
1,926

 
$
2,875

 
 
 
 
Fair value of plan assets at beginning of year
$
15

 
$
8

Employer contributions
270

 
258

Benefit payments
(282
)
 
(251
)
Fair value of plan assets at end of year
$
3

 
$
15
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:
 
2016
 
2015
 
(in thousands)
Accumulated postretirement benefit obligation
$
(1,926
)
 
$
(2,875
)
Fair value of plan assets
3

 
15

Funded status
$
(1,923
)
 
$
(2,860
)
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, 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
)
Recognized as a component of 2016 postretirement benefit cost
465

 
86

 
551

 
358

Unrecognized gains arising in 2016
—

 
(761
)
 
(761
)
 
(495
)
Balance as of December 31, 2016
$
(4,869
)
 
$
(1,183
)
 
$
(6,052
)
 
$
(3,935
)
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:
 
2016
 
2015
 
2014
Discount rate-projected benefit obligation
4.25
%
 
4.25
%
 
3.75
%
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
 
2017
$
237

2018
222

2019
207

2020
193

2021
178

2022 – 2026
695

 
$
1,732