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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2015
Summary of Projected Benefit Obligation |
(In thousands) |  | 2015 |  | 2014
Projected benefit obligation: |  |  |  |  |  |  |  |
Balance, January 1 |  | $ | 81,342 |  |  | $ | 63,439 |
Service cost |  |  | 3,795 |  |  |  | 3,003 |
Interest cost |  |  | 3,178 |  |  |  | 3,037 |
Actuarial (gain) loss |  |  | (8,358 |  |  |  | 13,349 |
Benefits paid |  |  | (1,588 | ) |  |  | (1,486 | )
Balance, December 31 |  | $ | 78,369 |  |  | $ | 81,342 |
Plan assets: |  |  |  |  |  |  |  |
Fair value, January 1 |  | $ | 72,972 |  |  | $ | 70,627 |
Actual return |  |  | (210 | ) |  |  | 3,831 |
Employer contribution |  |  | — |  |  |  | — |
Benefits paid |  |  | (1,588 | ) |  |  | (1,486 | )
Fair value, December 31 |  | $ | 71,174 |  |  | $ | 72,972 |
Funded status: |  |  |  |  |  |  |  |
Accrued pension liability |  | $ | (7,195 | ) |  | $ | (8,370 | )
Schedule of Assumptions used to Determine Projected Benefit Obligation |
|  | 2015 |  | 2014 |  | 2013
Weighted average discount rate |  | 4.50 | % | 4.00 | % |  | 5.00 | %
Rate of increase in compensation levels |  | (a) |  | (a) |  |  | 3.75 | %
(a) | 6.0% graded down to 3.25% over the first seven years of service
Schedule of Expected Pension Benefit Payments |
|  | Amount
2016 |  | $ | 2,064,000
2017 |  |  | 2,302,000
2018 |  |  | 2,630,000
2019 |  |  | 2,799,000
2020 |  |  | 3,023,000
2021-2025 |  |  | 20,160,000
Schedule of Plan's Pension Costs |
|  | For the Year Ended
|  | December 31,
(In thousands) |  | 2015 |  | 2014 |  | 2013
Service cost benefits earned during the year |  | $ | 3,796 |  |  | $ | 3,003 |  |  | $ | 3,452 |
Interest cost on projected benefit obligations |  |  | 3,178 |  |  |  | 3,037 |  |  |  | 2,819 |
Expected return on plan assets |  |  | (4,864 | ) |  |  | (4,711 | ) |  |  | (4,469 | )
Net amortization and deferral |  |  | 1,542 |  |  |  | 244 |  |  |  | 1,729 |
Net periodic pension cost |  | $ | 3,652 |  |  | $ | 1,573 |  |  | $ | 3,531 |
Schedule of Assumptions used to Determine Net Pension Cost |
|  | 2015 |  | 2014 |  | 2015
Weighted average discount rate |  | 4.00 | % |  | 5.00 | % |  | 4.25 | %
Rate of increase in compensation levels |  | (a) |  |  | 3.75 | % |  | 3.75 | %
Expected long-term rate of return on assets |  | 6.75 | % |  | 6.75 | % |  | 7.25 | %
(a) | 6.0% graded down to 3.25% over the first seven years of service
Schedule of Assumed Long-term Rate of Return on Assets |
|  |  |  |  | One-Year Nominal |  | Annual Standard
Asset Class |  | % of Total Portfolio |  | Return |  | Deviation
Core Fixed Income |  | 50 | % |  | 4.84 | % |  | 4.64 | %
Large Cap U.S. Equities |  | 10 | % |  | 7.42 | % |  | 16.14 | %
Large Cap U.S. Growth Equities |  | 8.5 | % |  | 8.14 | % |  | 18.35 | %
Large Cap U.S. Value Equities |  | 8.5 | % |  | 7.29 | % |  | 16.27 | %
Small Cap U.S. Equities |  | 7 | % |  | 8.42 | % |  | 20.02 | %
International (Developed) |  | 15 | % |  | 8.80 | % |  | 19.35 | %
International (Emerging) |  | 1 | % |  | 10.49 | % |  | 27.66 | %
Summary of the Fair Value Measurements by Type of Asset |
|  |  | Fair Value Measurements as of December 31,
|  |  | 2015 |  | 2014
|  |  |  |  | Quoted Prices |  |  |  | Quoted Prices
|  |  |  |  | in Active |  |  |  |  |  | in Active |  |
|  |  |  |  | Markets for |  | Significant |  |  |  | Markets for |  | Significant
|  |  |  |  | Identical |  | Observable |  |  |  | Identical |  | Observable
|  |  |  |  | Assets |  | Inputs |  |  |  | Assets |  | Inputs
(In thousands) |  |  | Total |  | (Level 1) |  | (Level 2) |  | Total |  | (Level 1) |  | (Level 2)
Cash |  |  | $ | 283 |  |  | $ | 283 |  |  | $ | — |  |  | $ | 268 |  |  | $ | 268 |  |  | $ | — |
Equity securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Large Cap Growth |  |  |  | 6,507 |  |  |  | — |  |  |  | 6,507 |  |  |  | 7,165 |  |  |  | — |  |  |  | 7,165 |
U.S. Large Cap Value |  |  |  | 6,401 |  |  |  | — |  |  |  | 6,401 |  |  |  | 7,066 |  |  |  | — |  |  |  | 7,066 |
U.S. Small/Mid Cap Growth |  |  |  | 2,769 |  |  |  | — |  |  |  | 2,769 |  |  |  | 2,950 |  |  |  | — |  |  |  | 2,950 |
U.S. Small/Mid Cap Value |  |  |  | 2,649 |  |  |  | — |  |  |  | 2,649 |  |  |  | 2,721 |  |  |  | — |  |  |  | 2,721 |
Non-U. S. Core |  |  |  | 10,474 |  |  |  | — |  |  |  | 10,474 |  |  |  | 10,317 |  |  |  | — |  |  |  | 10,317 |
U.S. Large Cap Passive |  |  |  | 7,153 |  |  |  | — |  |  |  | 7,153 |  |  |  | 7,192 |  |  |  | — |  |  |  | 7,192 |
Emerging Markets |  |  |  | 599 |  |  |  | — |  |  |  | 599 |  |  |  | 703 |  |  |  | — |  |  |  | 703 |
Fixed Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Core |  |  |  | 23,881 |  |  |  | — |  |  |  | 23,881 |  |  |  | 24,019 |  |  |  | — |  |  |  | 24,019 |
U.S. Passive |  |  |  | 9,328 |  |  |  | — |  |  |  | 9,328 |  |  |  | 9,275 |  |  |  | — |  |  |  | 9,275 |
Opportunistic |  |  |  | 1,130 |  |  |  |  |  |  |  | 1,130 |  |  |  | 1,296 |  |  |  | — |  |  |  | 1,296 |
Total |  |  | $ | 71,174 |  |  | $ | 283 |  |  | $ | 70,891 |  |  | $ | 72,972 |  |  | $ | 268 |  |  | $ | 72,704 |
Supplemental Executive Retirement Plan [Member] |
Summary of Projected Benefit Obligation |
|  | December 31,
(In thousands) |  | 2015 |  | 2014
Benefit obligation: |  |  |  |  |  |  |  |
Balance, January 1 |  | $ | 9,403 |  |  | $ | 8,048 |
Service cost |  |  | 140 |  |  |  | 136 |
Interest cost |  |  | 348 |  |  |  | 377 |
Benefits paid |  |  | (243 | ) |  |  | (236 | )
Actuarial (gain) loss |  |  | (900 | ) |  |  | 1,078 |
Balance, December 31 |  | $ | 8,748 |  |  | $ | 9,403 |
Schedule of Assumptions used to Determine Projected Benefit Obligation |
|  | 2015 |  | 2014 |  | 2013
Weighted average discount rate |  | 4.25 | % | 3.75 | % |  | 4.75 | %
Rate of increase in compensation levels |  | (a) |  | (a) |  |  | 3.75 | %
(a) | 6.00% graded down to 3.25% over the first seven years of service.
Schedule of Expected Pension Benefit Payments |
|  | Amount |
2016 |  | $ | 247,000
2017 |  |  | 246,000
2018 |  |  | 311,000
2019 |  |  | 310,000
2020 |  |  | 308,000
2021-2025 |  |  | 3,236,000
Schedule of Plan's Pension Costs |
|  |  | For the Year Ended December 31,
(In thousands) |  |  | 2015 |  | 2014 |  | 2013
Service cost – benefits earned during the year |  |  | $ | 140 |  |  | $ | 136 |  |  | $ | 144 |
Interest cost on projected benefit obligations |  |  |  | 348 |  |  |  | 377 |  |  |  | 335 |
Net amortization and deferral |  |  |  | 654 |  |  |  | 431 |  |  |  | 551 |
Net periodic pension cost |  |  | $ | 1,142 |  |  | $ | 944 |  |  | $ | 1,030 |
Schedule of Pretax Amounts in Accumulated Other Comprehensive Loss |
|  |  | The Plan |  | SERP
(In thousands) |  |  | 2015 |  | 2014 |  | 2015 |  | 2014
Prior service cost |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Net actuarial loss |  |  |  | 20,637 |  |  |  | 25,464 |  |  |  | 2,169 |  |  |  | 3,723 |
Total |  |  | $ | 20,637 |  |  | $ | 25,464 |  |  | $ | 2,169 |  |  | $ | 3,723 |

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