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Benefit Plans - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Pension Plans [Abstract]      
Market gains $ 2,979,000 $ 2,442,000  
Actuarial gain (loss), discount rate change 116,372,000    
Actuarial gain (loss), data and other changes (12,422,000)    
Actuarial gain (loss), mortality change 4,000    
Adjustment to pension benefit plans, net of taxes (2,151,000) (716,000) $ 880,000
Value of life insurance contracts 3,420,000 4,191,000  
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 3,003,000 2,822,000 2,824,000
Other comprehensive income (loss), defined benefit plan, net loss 31,549,000 62,270,000  
Other comprehensive (income) loss, defined benefit plan, prior service cost 56,000 73,000  
Pension Benefits      
Pension Plans [Abstract]      
Projected benefit obligation 289,123,000 383,838,000 386,091,000
Net periodic pension cost 4,268,000 8,068,000 8,440,000
Total investments made to fund SERP 11,712,000 13,147,000  
Executive Supplemental Retirement Plan      
Pension Plans [Abstract]      
Projected benefit obligation 39,455,000 50,742,000  
Net periodic pension cost 4,400,000 4,456,000 4,480,000
Adjustment to pension benefit plans, net of taxes 1,640,000 901,000 $ (1,190,000)
Total investments made to fund SERP $ 6,395,000 $ 8,147,000  
Minimum      
Pension Plans [Abstract]      
Period for performance standards 3 years    
Minimum | Pension Benefits      
Pension Plans [Abstract]      
Net periodic benefit cost, expected return on plan assets 6.50% 6.50% 6.50%
Maximum      
Pension Plans [Abstract]      
Period for performance standards 5 years    
Maximum | Pension Benefits      
Pension Plans [Abstract]      
Net periodic benefit cost, expected return on plan assets 6.75% 6.75% 6.75%
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 $ 6,197,000 $ 6,237,000  
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 $ 4,508,000 $ 4,599,000