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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2019
Retirement Benefits [Abstract] |
Schedule of Changes in Benefit Obligation and Plan Assets | The following table summarizes changes in the benefit obligation and plan assets for each postretirement benefit plan as of the dates indicated:
|  | SERP |  | Other Postretirement Benefits
|  | December 31,
(In thousands) |  | 2019 |  | 2018 |  | 2019 |  | 2018
Benefit obligations: |  |  |  |  |  |  |  |  |  |  |
Beginning of year |  | $ | 12,717 |  |  | $ | 13,790 |  |  | $ | 3,616 |  |  | $ | 3,791 |
Service cost |  | 395 |  |  | 446 |  |  | 48 |  |  | 46 |
Interest cost |  | 523 |  |  | 488 |  |  | 148 |  |  | 132 |
Actuarial loss (gain) |  | 1,524 |  |  | (1,534 | ) |  | 394 |  |  | (209 | )
Benefits paid |  | (477 | ) |  | (473 | ) |  | (157 | ) |  | (144 | )
End of year |  | 14,682 |  |  | 12,717 |  |  | 4,049 |  |  | 3,616 |
Fair value of plan assets: |  |  |  |  |  |  |  |
Beginning of year |  | — |  |  | — |  |  | — |  |  | — |
Employer contributions |  | 477 |  |  | 473 |  |  | 157 |  |  | 144 |
Benefits paid |  | (477 | ) |  | (473 | ) |  | (157 | ) |  | (144 | )
End of year |  | — |  |  | — |  |  | — |  |  | — |
Unfunded status at end of year(1) |  | $ | 14,682 |  |  | $ | 12,717 |  |  | $ | 4,049 |  |  | $ | 3,616 |
Amounts recognized in AOCI, net of tax: |  |  |  |  |  |  |  |
Net actuarial loss |  | $ | 2,864 |  |  | $ | 1,859 |  |  | $ | 738 |  |  | $ | 449 |
Prior service credit |  | — |  |  | — |  |  | (132 | ) |  | (151 | )
Total |  | $ | 2,864 |  |  | $ | 1,859 |  |  | $ | 606 |  |  | $ | 298 |
(1) | Presented within other liabilities on the consolidated statements of condition.
Schedule of Net Period Benefit Cost and Other Amounts Recognized in Other Comprehensive Income | The components of net periodic benefit cost and other amounts recognized in OCI, before taxes, were as follows for the year ended December 31:
|  | SERP |  | Other Postretirement Benefits
(In thousands) |  | 2019 |  | 2018 |  | 2017 |  | 2019 |  | 2018 |  | 2017
Net periodic benefit cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost(1) |  | $ | 395 |  |  | $ | 446 |  |  | $ | 335 |  |  | $ | 48 |  |  | $ | 46 |  |  | $ | 53 |
Interest cost(2) |  | 523 |  |  | 488 |  |  | 452 |  |  | 148 |  |  | 132 |  |  | 144 |
Recognized net actuarial loss(2) |  | 240 |  |  | 561 |  |  | 246 |  |  | 31 |  |  | 52 |  |  | 40 |
Amortization of prior service credit(2) |  | — |  |  | — |  |  | — |  |  | (24 | ) |  | (24 | ) |  | (24 | )
Net periodic benefit cost |  | 1,158 |  |  | 1,495 |  |  | 1,033 |  |  | 203 |  |  | 206 |  |  | 213 |
Changes in funded status recognized in OCI, before taxes: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net actuarial loss (gain) arising during period |  | 1,524 |  |  | (1,534 | ) |  | 1,955 |  |  | 394 |  |  | (209 | ) |  | 110 |
Reclassifications to net periodic benefit cost: |  |  |  |  |  |  |  |  |  |  |  |
Amortization of net unrecognized actuarial loss |  | (240 | ) |  | (561 | ) |  | (246 | ) |  | (31 | ) |  | (52 | ) |  | (40 | )
Amortization of prior service credit |  | — |  |  | — |  |  | — |  |  | 24 |  |  | 24 |  |  | 24 |
Total recognized in OCI, before taxes |  | 1,284 |  |  | (2,095 | ) |  | 1,709 |  |  | 387 |  |  | (237 | ) |  | 94 |
Total recognized in net periodic benefit cost and OCI, before taxes |  | $ | 2,442 |  |  | $ | (600 | ) |  | $ | 2,742 |  |  | $ | 590 |  |  | $ | (31 | ) |  | $ | 307 |
Schedule of Assumptions Used in Determining Benefit Obligations and Net Period Benefit Costs | The following assumptions were used in determining benefit obligations and net period benefit costs:
| SERP |  | Other Postretirement Benefits
| 2019 |  | 2018 |  | 2017 |  | 2019 |  | 2018 |  | 2017
Weighted-average assumptions as of end of year: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate for benefit obligation | 3.2 | % |  | 4.2 | % |  | 3.6 | % |  | 3.2 | % |  | 4.2 | % |  | 3.6 | %
Discount rate for net periodic benefit cost | 4.2 | % |  | 3.6 | % |  | 4.0 | % |  | 4.2 | % |  | 3.6 | % |  | 4.0 | %
Rate of compensation increase for benefit obligation | 3.0 | % |  | 3.0 | % |  | 5.0 | % |  | N/A |  |  | N/A |  |  | N/A |
Rate of compensation increase for net periodic benefit cost | 3.0 | % |  | 3.0 | % |  | 5.0 | % |  | N/A |  |  | N/A |  |  | N/A |
Health care cost trend rate assumed for future years | N/A |  |  | N/A |  |  | N/A |  |  | 4.5% - 7.0% |  |  | 5.0% - 6.0% |  |  | 5.0% - 6.0% |
Schedule of Estimated Future Benefit Payments | The expected benefit payments for the next ten years are presented in the following table:
(In thousands) |  | SERP |  | Other Postretirement Benefits
2020 |  | $ | 486 |  |  | $ | 268 |
2021 |  | 536 |  |  | 265 |
2022 |  | 566 |  |  | 233 |
2023 |  | 526 |  |  | 219 |
2024 |  | 436 |  |  | 231 |
Next 5 years |  | 2,141 |  |  | 1,084 |

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