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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