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Equity Plans (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation costs charged to income: $ 1,058 $ 952 $ 2,318 $ 2,556
Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of equity instruments granted (shares) 761 0 43,474 26,565
Grant date fair value of equity instruments granted (usd per share) $ 58.63 $ 0 $ 63.87 $ 51.42
Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of equity instruments granted (shares) 58 0 24,777 30,401
Grant date fair value of equity instruments granted (usd per share) $ 62.95 $ 0 $ 65.02 $ 60.46
Performance Shares | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Target vesting percentage     0.00%  
Performance Shares | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Target vesting percentage     150.00%  
Market-based RSU [Member] | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Target vesting percentage     0.00%  
Market-based RSU [Member] | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Target vesting percentage     200.00%  
Restricted stock and deferred restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation costs charged to income: $ 906 $ 812 $ 1,995 $ 2,273
Unrecognized compensation costs $ 4,987   $ 4,987  
Recognition period for unrecognized compensation cost     1 year 10 months 9 days  
Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares issuable upon exercise of Incentive Plan awards (shares)     182,367  
Remaining shares available for issuance under the Incentive Plan (shares) 743,038   743,038  
CTWS Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares issuable upon exercise of Incentive Plan awards (shares)     66,430  
Employee Stock Purchase Plan (ESPP)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation costs charged to income: $ 152 140 $ 323 283
ESPP proceeds 860 792 1,830 1,603
Unrecognized compensation costs $ 116   $ 116  
Purchase price of common stock under ESPP (percent)     85.00%  
Maximum percentage of base compensation employees can designate for stock purchases under ESPP (percent) 10.00%   10.00%  
Plan expense $ 85 $ 82 $ 244 $ 223
Employee Stock Purchase Plan (ESPP) | Common Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized for issuance under the plan (shares) 400,000   400,000