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Benefit Plans - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Pension Plans [Abstract] |  |  |
Market gains |  | $ 2,442,000 | $ 5,464,000
Actuarial gain (loss), discount rate change | $ 20,017,000 |  |
Actuarial gain (loss), data and other changes | (11,913,000) |  |
Actuarial gain (loss), mortality change | (593,000) |  |
Adjustment to pension benefit plans, net of taxes | (716,000) | 880,000 | (9,000)
Value of life insurance contracts | 4,191,000 | 4,311,000 |
Annual maximum contribution limit under Health Care Spending Account plan | 2,500 |  |
Annual maximum contribution limit under Dependent Care Spending Account plan | 5,000 |  |
Employer contributions to deferral plan | 2,822,000 | 2,824,000 | 2,046,000
Other comprehensive income (loss), defined benefit plan, net loss | 62,270,000 | 94,476,000 |
Other comprehensive (income) loss, defined benefit plan, prior service cost | 73,000 | 114,000 |
Pension Plan |  |  |
Pension Plans [Abstract] |  |  |
Projected benefit obligation | 383,838,000 | 386,091,000 | 338,240,000
Net periodic pension cost | 8,068,000 | 8,440,000 | 8,367,000
Total investments made to fund SERP | 13,147,000 | 16,609,000 |
Executive Supplemental Retirement Plan |  |  |
Pension Plans [Abstract] |  |  |
Projected benefit obligation | 50,742,000 | 50,757,000 |
Net periodic pension cost | 4,456,000 | 4,480,000 | 3,219,000
Adjustment to pension benefit plans, net of taxes | 901,000 | (1,190,000) | $ (788,000)
Total investments made to fund SERP | $ 8,147,000 | $ 7,470,000 |
Minimum |  |  |
Pension Plans [Abstract] |  |  |
Period for performance standards | 3 years |  |
Minimum | Pension Plan |  |  |
Pension Plans [Abstract] |  |  |
Net periodic benefit cost, expected return on plan assets | 6.50% | 6.50% | 7.00%
Maximum |  |  |
Pension Plans [Abstract] |  |  |
Period for performance standards | 5 years |  |
Maximum | Pension Plan |  |  |
Pension Plans [Abstract] |  |  |
Net periodic benefit cost, expected return on plan assets | 6.75% | 6.75% | 7.25%
CTWS Employees |  |  |
Pension Plans [Abstract] |  |  |
Rate of compensation increase to company sponsored savings plan | 1.50% |  |
Executives and Non-employee Directors | Deferred compensation arrangement with individual, by type of compensation, pension and other postretirement benefits |  |  |
Pension Plans [Abstract] |  |  |
Deferrals by executives and non-employee directors | $ 6,237,000 | $ 6,144,000 | $ 7,834,000
Executives and Non-employee Directors | Deferred compensation arrangement with individual, by type of compensation, pension and other postretirement benefits | CTWS |  |  |
Pension Plans [Abstract] |  |  |
Deferrals by executives and non-employee directors | $ 4,599,000 | $ 4,130,000 |

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