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Equity Plans (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation costs charged to income: $ 1,009 $ 718 $ 1,260 $ 1,604
Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of equity instruments granted (shares) 14,346 9,114 42,713 26,565
Grant date fair value of equity instruments granted (usd per share) $ 60.17 $ 51.69 $ 63.97 $ 51.42
Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of equity instruments granted (shares) 138 0 24,719 30,401
Grant date fair value of equity instruments granted (usd per share) $ 66.99 $ 0 $ 72.01 $ 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: $ 1,009 $ 718 $ 1,089 $ 1,461
Unrecognized compensation costs $ 6,050   $ 6,050  
Recognition period for unrecognized compensation cost     2 years 10 days  
Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares issuable upon exercise of Incentive Plan awards (shares)     179,913  
Remaining shares available for issuance under the Incentive Plan (shares) 745,492   745,492  
CTWS Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares issuable upon exercise of Incentive Plan awards (shares)     101,711  
Employee Stock Purchase Plan (ESPP)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation costs charged to income: $ 0 0 $ 171 143
ESPP proceeds 0 0 970 811
Unrecognized compensation costs $ 25   $ 25  
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 $ 74 $ 65 $ 160 $ 141
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