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Equity Plans Equity Plans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Option Indexed to Issuer's Equity [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested, Grant Date Fair Value | $ 2,420 | $ 1,913 | $ 2,775
Document Period End Date | Dec. 31, 2019 |  |
Restricted Stock Awards, Performance-based, Vested Balance | 7,676 |  |
Restricted Stock Awards, Performance-based, Outstanding Balance | 42,700 |  |
Restricted Stock Awards, Performance-based, Issued, Intrinsic Value | 6,120 | 52,629 | 15,390
Summary of Activity under the Plan [Abstract] |  |  |
Compensation costs charged to income | $ 3,406 | $ 2,117 | $ 2,643
Proceeds from the exercise of stock options and similar instruments | $ 1,603 | $ 1,371 | $ 1,215
Employee Stock Purchase Plan [Abstract] |  |  |
Shares issued during the period under the plan | 30,255 | 25,907 | 27,743
Cash received from employees toward purchases under the plan | $ 1,682 | $ 1,523 | $ 1,282
Restricted Stock and Deferred Restricted Stock [Member] |  |  |
Summary of Activity under the Plan [Abstract] |  |  |
Compensation costs charged to income | 3,123 | $ 1,875 | $ 2,429
Employee Stock Purchase Plan [Abstract] |  |  |
Unrecognized compensation cost | $ 3,915 |  |
Deferred Restricted Stock Awards [Member] |  |  |
Dividend Equivalent Rights [Abstract] |  |  |
Cumulative dividend equivalent rights converted to deferred restricted stock awards | 81,231 | 79,478 | 77,034
Dividend Equivalent Rights [Member] |  |  |
Dividend Equivalent Rights [Abstract] |  |  |
Liability for dividend equivalent rights | $ 93 | $ 97 | $ 139
Incentive Plan [Member] |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |
Number of shares reserved for issuance under the plan | 1,800,000 |  |
Maximum number of shares per employee | 600,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued Pursuant To The Plan | 819,340 | 793,811 | 628,546
Shares issuable under the plan upon exercise of outstanding awards | 174,764 | 124,275 | 228,885
Number of shares available for grant | 805,896 |  |
CTWS Plan [Member] |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |
Number of shares reserved for issuance under the plan | 156,022 |  |
Employee Stock Purchase Plan [Member] |  |  |
Summary of Activity under the Plan [Abstract] |  |  |
Compensation costs charged to income | $ 283 | $ 242 | $ 214
Proceeds from the exercise of stock options and similar instruments | $ 1,603 | 1,371 | 1,215
Employee Stock Purchase Plan [Abstract] |  |  |
Purchase price of common stock to employees under the plan, percent | 85.00% |  |
Maximum amount of base salary employees can designate for share purchase under the plan | 10.00% |  |
Expenses recorded under the plan | $ 294 | $ 265 | $ 229
Unrecognized compensation cost | $ 206 |  |
Common Stock [Member] | Employee Stock Purchase Plan [Member] |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |
Number of shares reserved for issuance under the plan | 400,000 |  |

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