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Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Retirement Benefits [Abstract] |
Pension Plan and Post-Retirement Healthcare and Life Insurance Plans | The following table sets forth information regarding the pension plan and post-retirement healthcare and life insurance plans (in thousands):
| Pension |  | Post-retirement
| 2017 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015
Change in benefit obligation: |  |  |  |  |  |  |  |  |  |  |
Benefit obligation at beginning of year | $ | 29,533 |  |  | 28,274 |  |  | 28,921 |  |  | 20,805 |  |  | 25,694 |  |  | 28,333 |
Service cost | — |  |  | — |  |  | — |  |  | 105 |  |  | 150 |  |  | 168 |
Interest cost | 1,227 |  |  | 1,247 |  |  | 1,137 |  |  | 871 |  |  | 1,138 |  |  | 1,122 |
Actuarial loss | — |  |  | 70 |  |  | 78 |  |  | — |  |  | — |  |  | 122 |
Benefits paid | (1,590 | ) |  | (1,247 | ) |  | (1,179 | ) |  | (560 | ) |  | (682 | ) |  | (644 | )
Change in actuarial assumptions | 2,800 |  |  | 1,189 |  |  | (683 | ) |  | 1,536 |  |  | (5,495 | ) |  | (3,407 | )
Benefit obligation at end of year | $ | 31,970 |  |  | 29,533 |  |  | 28,274 |  |  | 22,757 |  |  | 20,805 |  |  | 25,694 |
Change in plan assets: |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year | $ | 43,153 |  |  | 41,448 |  |  | 42,744 |  |  | — |  |  | — |  |  | — |
Actual return on plan assets | 5,307 |  |  | 2,952 |  |  | (117 | ) |  | — |  |  | — |  |  | — |
Employer contributions | — |  |  | — |  |  | — |  |  | 560 |  |  | 682 |  |  | 644 |
Benefits paid | (1,590 | ) |  | (1,247 | ) |  | (1,179 | ) |  | (560 | ) |  | (682 | ) |  | (644 | )
Fair value of plan assets at end of year | $ | 46,870 |  |  | 43,153 |  |  | 41,448 |  |  | — |  |  | — |  |  | — |
Funded status at end of year | $ | 14,900 |  |  | 13,620 |  |  | 13,174 |  |  | (22,757 | ) |  | (20,805 | ) |  | (25,694 | )
Components of Accumulated Other Comprehensive Loss (Gain) | The components of accumulated other comprehensive loss (gain) related to the pension plan and other post-retirement benefits, on a pre-tax basis, at December 31, 2017 and 2016 are summarized in the following table (in thousands):
| Pension |  | Post-retirement
| 2017 |  | 2016 |  | 2017 |  | 2016
Unrecognized prior service cost | $ | — |  |  | — |  |  | — |  |  | — |
Unrecognized net actuarial loss (gain) | 11,091 |  |  | 11,968 |  |  | (4,781 | ) |  | (6,993 | )
Total accumulated other comprehensive loss (gain) | $ | 11,091 |  |  | 11,968 |  |  | (4,781 | ) |  | (6,993 | )
The following table presents the changes in the components of accumulated other comprehensive (loss) income, net of tax, for the years ended December 31, 2017 and 2016, including the reclassification of income tax effects due to the adoption of ASU No. 2018-02 for the year ended December 31, 2017 (in thousands):
|  | Changes in Accumulated Other Comprehensive (Loss) Income by Component, net of tax For the Years Ended December 31,
|  | 2017 |  | 2016
|  | Unrealized Gains on Securities Available for Sale |  | Post-Retirement Obligations |  | Unrealized gains (losses) on Derivatives (cash flow hedges) |  | Accumulated Other Comprehensive (Loss) Income |  | Unrealized Gains on Securities Available for Sale |  | Post-Retirement Obligations |  | Unrealized gains (losses) on Derivatives (cash flow hedges) |  | Accumulated Other Comprehensive (Loss) Income
Balance at the beginning of the period |  | $ | (510 | ) |  | (3,056 | ) |  | 169 |  |  | (3,397 | ) |  | 3,951 |  |  | (6,424 | ) |  | (73 | ) |  | (2,546 | )
Current period change in other comprehensive income (loss) |  | (2,163 | ) |  | (889 | ) |  | 379 |  |  | (2,673 | ) |  | (4,461 | ) |  | 3,368 |  |  | 242 |  |  | (851 | )
Reclassification of tax effects due to the adoption of ASU No. 2018-02 |  | (619 | ) |  | (901 | ) |  | 125 |  |  | (1,395 | ) |  | — |  |  | — |  |  | — |  |  | — |
Balance at the end of the period |  | $ | (3,292 | ) |  | (4,846 | ) |  | 673 |  |  | (7,465 | ) |  | (510 | ) |  | (3,056 | ) |  | 169 |  |  | (3,397 | )
Net Periodic Benefit Cost (Increase) | Net periodic benefit (increase) cost for the years ending December 31, 2017, 2016 and 2015, included the following components (in thousands):
| Pension |  | Post-retirement
| 2017 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015
Service cost | $ | — |  |  | — |  |  | — |  |  | 105 |  |  | 150 |  |  | 168 |
Interest cost | 1,227 |  |  | 1,247 |  |  | 1,137 |  |  | 871 |  |  | 1,138 |  |  | 1,122 |
Return on plan assets | (2,550 | ) |  | (2,449 | ) |  | (2,530 | ) |  | — |  |  | — |  |  | — |
Amortization of: |  |  |  |  |  |  |  |  |  |  |
Net gain (loss) | 920 |  |  | 943 |  |  | 774 |  |  | (677 | ) |  | — |  |  | 1 |
Unrecognized prior service cost | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (1 | )
Net periodic benefit (increase) cost | $ | (403 | ) |  | (259 | ) |  | (619 | ) |  | 299 |  |  | 1,288 |  |  | 1,290 |
Weighted Average Actuarial Assumptions Used | The weighted average actuarial assumptions used in the plan determinations at December 31, 2017, 2016 and 2015 were as follows:
| Pension |  | Post-retirement
| 2017 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015
Discount rate | 3.50 | % |  | 4.25 | % |  | 4.50 | % |  | 3.50 | % |  | 4.25 | % |  | 4.50 | %
Rate of compensation increase | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Expected return on plan assets | 6.00 |  |  | 6.00 |  |  | 6.00 |  |  | — |  |  | — |  |  | — |
Medical and life insurance benefits cost rate of increase | — |  |  | — |  |  | — |  |  | 6.00 |  |  | 6.00 |  |  | 6.00 |
Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rate | A 1% change in the assumed health care cost trend rate would have had the following effects on post-retirement benefits at December 31, 2017 (in thousands):
| 1% increase |  | 1% decrease
Effect on total service cost and interest cost | $ | 170 |  |  | 140 |
Effect on post-retirement benefits obligation | $ | 4,000 |  |  | 3,170 |
Estimated Future Benefit Payments | Estimated future benefit payments, which reflect expected future service, as appropriate for the next five years, are as follows (in thousands):
| Pension |  | Post-retirement
2018 | $ | 1,443 |  |  | $ | 645 |
2019 | 1,496 |  |  | 684 |
2020 | 1,538 |  |  | 705 |
2021 | 1,593 |  |  | 771 |
2022 | 1,635 |  |  | 828 |
Weighted-Average Asset Allocation of Pension Plan Assets | The weighted-average asset allocation of pension plan assets at December 31, 2017 and 2016 were as follows:
Asset Category |  | 2017 |  | 2016
Domestic equities |  | 38 | % |  | 37 | %
Foreign equities |  | 11 | % |  | 11 | %
Fixed income |  | 49 | % |  | 50 | %
Real estate |  | 2 | % |  | 2 | %
Cash |  | 0 | % |  | 0 | %
Total |  | 100 | % |  | 100 | %
Target Allocation of Assets and Acceptable Ranges | The target allocation of assets and acceptable ranges around the targets are as follows:
Asset Category |  | Target |  | Allowable Range
Domestic equities |  | 37 | % |  | 30-41% |
Foreign equities |  | 11 | % |  | 5-13% |
Fixed income |  | 50 | % |  | 40-65% |
Real estate |  | 2 | % |  | 0-4% |
Cash |  | 0 | % |  | 0 | %
Total |  | 100 | % |  |
Assets Measured at Fair Value on Recurring Basis | The following tables present the assets that are measured at fair value on a recurring basis by level within the U.S. GAAP fair value hierarchy as reported on the statements of net assets available for Plan benefits at December 31, 2017 and 2016, respectively. Financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement.
| Fair value measurements at December 31, 2017
(in thousands) | Total |  | (Level 1) |  | (Level 2) |  | (Level 3)
Group annuity contracts | $ | 120 |  |  | — |  |  | 120 |  |  | — |
Mutual funds: |  |  |  |  |  |  |
Fixed income | 13,725 |  |  | 13,725 |  |  | — |  |  | — |
International equity | 5,110 |  |  | 5,110 |  |  | — |  |  | — |
Large U.S. equity | 1,431 |  |  | 1,431 |  |  | — |  |  | — |
Small/Mid U.S. equity | 950 |  |  | 950 |  |  | — |  |  | — |
Total mutual funds | 21,216 |  |  | 21,216 |  |  | — |  |  | — |
Pooled separate accounts | 25,534 |  |  | — |  |  | 25,534 |  |  | — |
Total investments | $ | 46,870 |  |  | 21,216 |  |  | 25,654 |  |  | — |
| Fair value measurements at December 31, 2016
(in thousands) | Total |  | (Level 1) |  | (Level 2) |  | (Level 3)
Group annuity contracts | $ | 127 |  |  | — |  |  | 127 |  |  | — |
Mutual funds: |  |  |  |  |  |  |
Fixed income | 12,740 |  |  | 12,740 |  |  | — |  |  | — |
International equity | 4,659 |  |  | 4,659 |  |  | — |  |  | — |
Large U.S. equity | 1,296 |  |  | 1,296 |  |  | — |  |  | — |
Small/Mid U.S. equity | 840 |  |  | 840 |  |  | — |  |  | — |
Total mutual funds | 19,535 |  |  | 19,535 |  |  | — |  |  | — |
Pooled separate accounts | 23,491 |  |  | — |  |  | 23,491 |  |  | — |
Total investments | $ | 43,153 |  |  | 19,535 |  |  | 23,618 |  |  | — |
Status of Unvested Stock Awards | A summary status of the granted but unvested stock awards as of December 31, and changes during the year, is presented below:
| Restricted Stock Awards
| 2017 |  | 2016 |  | 2015
Outstanding at beginning of year | 547,698 |  |  | 591,746 |  |  | 846,462 |
Granted | 288,519 |  |  | 351,836 |  |  | 339,936 |
Forfeited | (62,677 | ) |  | (178,632 | ) |  | (240,191 | )
Vested | (112,757 | ) |  | (217,252 | ) |  | (354,461 | )
Outstanding at the end of year | 660,783 |  |  | 547,698 |  |  | 591,746 |
Status of Unexercised Stock Options | A summary of the status of the granted but unexercised stock options as of December 31, and changes during the year is presented below:
| 2017 |  | 2016 |  | 2015
| Number of stock options |  | Weighted average exercise price |  | Number of stock options |  | Weighted average exercise price |  | Number of stock options |  | Weighted average exercise price
Outstanding at beginning of year | 703,669 |  |  | $ | 14.70 |  |  | 1,084,686 |  |  | $ | 15.32 |  |  | 1,284,321 |  |  | $ | 15.32 |
Granted | 42,857 |  |  | 26.31 |  |  | 76,327 |  |  | 18.70 |  |  | 65,972 |  |  | 16.38 |
Exercised | (238,370 | ) |  | 12.22 |  |  | (368,838 | ) |  | 16.92 |  |  | (201,320 | ) |  | 15.72 |
Forfeited | — |  |  | — |  |  | (82,006 | ) |  | 16.42 |  |  | (62,287 | ) |  | 14.93 |
Expired | (500 | ) |  | 17.94 |  |  | (6,500 | ) |  | 18.55 |  |  | (2,000 | ) |  | 17.94 |
Outstanding at the end of year | 507,656 |  |  | $ | 16.84 |  |  | 703,669 |  |  | $ | 14.70 |  |  | 1,084,686 |  |  | $ | 15.32 |
Stock Options Outstanding | The following table summarizes information about stock options outstanding at December 31, 2017:
| Options Outstanding |  | Options Exercisable
Range of exercise prices | Number of options outstanding |  | Average remaining contractual life |  | Weighted average exercise price |  | Number of options exercisable |  | Weighted average exercise price
$10.34-15.23 | 241,740 |  |  | 3.4 years |  | $ | 14.00 |  |  | 234,738 |  |  | $ | 13.84 |
$16.38-26.31 | 265,916 |  |  | 7.4 years |  | $ | 19.13 |  |  | 136,183 |  |  | $ | 17.45 |
Weighted Average Assumptions of Fair Value Option Grants | The fair value of the option grants was estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted average assumptions:
| For the year ended December 31,
| 2017 |  | 2016 |  | 2015
Expected dividend yield | 2.89 | % |  | 3.64 | % |  | 3.49 | %
Expected volatility | 20.34 | % |  | 20.71 | % |  | 21.29 | %
Risk-free interest rate | 2.05 | % |  | 1.21 | % |  | 1.58 | %
Expected option life | 8 years |  |  | 8 years |  |  | 8 years |

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