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Equity Plans Equity Plans - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Option Indexed to Issuer's Equity [Line Items] |  |  |
Fair value of restricted stock awards | $ 3,333 | $ 2,420 | $ 1,913
Performance-based and market-based restricted stock awards issued (in shares) | 5,327 | 6,120 | 52,629
Performance-based and market-based restricted stock awards vested (in shares) | 16,544 |  |
Performance-based and market-based restricted stock awards outstanding (in shares) | 43,257 |  |
Employee Stock Purchase Plan [Abstract] |  |  |
Shares issued during the period under the plan | 31,750 | 30,255 | 25,907
Restricted Stock and Deferred Restricted Stock |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |
Unrecognized compensation cost | $ 4,118 |  |
Period for recognition of compensation cost | 1 year 8 months 26 days |  |
Deferred Restricted Stock Awards |  |  |
Dividend Equivalent Rights [Abstract] |  |  |
Cumulative dividend equivalent rights converted to deferred restricted stock awards (in shares) | 83,679 | 81,231 | 79,478
Dividend Equivalent Rights |  |  |
Dividend Equivalent Rights [Abstract] |  |  |
Liability for dividend equivalent rights | $ 160 | $ 93 | $ 97
Performance Shares | Minimum |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |
Range of shares issuable | 0.00% |  |
Performance Shares | Maximum |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |
Range of shares issuable | 150.00% |  |
Market-Based Restricted Stock Awards | Minimum |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |
Range of shares issuable | 0.00% |  |
Market-Based Restricted Stock Awards | Maximum |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |
Range of shares issuable | 200.00% |  |
Incentive Plan | Restricted Stock and Deferred Restricted Stock |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |
Issued (in shares) | 68,995 |  |
Exercised (in shares) | 61,155 |  |
Forfeited (in shares) | 4,498 |  |
Outstanding (in shares) | 178,106 | 174,764 |
CTWS Plan |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |
Number of shares reserved for issuance under the plan (in shares) | 156,022 |  |
CTWS Plan | Restricted Stock and Deferred Restricted Stock |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |
Issued (in shares) | 1,701 |  |
Exercised (in shares) | 47,583 |  |
Forfeited (in shares) | 0 |  |
Outstanding (in shares) | 57,049 |  |
Employee Stock Purchase Plan |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |
Unrecognized compensation cost | $ 160 |  |
Employee Stock Purchase Plan [Abstract] |  |  |
Purchase price of common stock to employees under the plan, percent | 85.00% |  |
Maximum percent of base salary employees can designate for share purchase under the plan | 10.00% |  |
Expenses recorded under the plan | $ 342 | $ 294 | $ 265
Common Stock | Incentive Plan |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |
Number of shares reserved for issuance under the plan (in shares) | 1,800,000 |  |
Maximum number of shares per employee (in shares) | 600,000 |  |
Shares issued pursuant to the plan (in shares) | 880,495 | 819,340 | 793,811
Shares issuable under the plan upon exercise of outstanding awards (in shares) | 178,106 | 174,764 | 124,275
Number of shares available for grant (in shares) | 741,399 |  |
Common Stock | Employee Stock Purchase Plan |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |
Number of shares reserved for issuance under the plan (in shares) | 400,000 |  |
Number of shares available for grant (in shares) | 220,813 |  |

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