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Equity Plans (Details) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Apr. 24, 2019 $ / shares shares | Jan. 29, 2019 $ / shares shares | Jan. 02, 2019 vesting_installment $ / shares shares | Jun. 30, 2019 USD ($) shares | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) shares | Jun. 30, 2018 USD ($) | Mar. 14, 2018 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Compensation costs charged to income: | $ |  |  |  | $ 718 | $ 392 | $ 1,604 | $ 879 |
Restricted stock and deferred restricted stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Compensation costs charged to income: | $ |  |  |  | 718 | 392 | $ 1,461 | 764 |
Recognition period for unrecognized compensation cost |  |  |  |  |  | 1 year 5 months 1 day |  |
Unrecognized compensation costs | $ |  |  |  | $ 4,138 |  | $ 4,138 |  |
Key officers | Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of equity instruments granted (shares) |  |  | 17,451 |  |  |  |  |
Number of equal successive installments for vesting of stock awards (vesting installments) | vesting_installment |  |  | 3 |  |  |  |  |
Grant date fair value of equity instruments granted (usd per share) | $ / shares |  |  | $ 51.28 |  |  |  |  |
Key officers | Performance Shares |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of equity instruments granted (shares) |  | 9,882 |  |  |  |  |  |
Key officers | Performance Shares | Minimum |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Target vesting percentage |  | 0.00% |  |  |  |  |  |
Key officers | Performance Shares | Maximum |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Target vesting percentage |  | 150.00% |  |  |  |  |  |
Key officers | Performance Shares 2 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of equity instruments granted (shares) |  | 9,043 |  |  |  |  |  |
Grant date fair value of equity instruments granted (usd per share) | $ / shares |  | $ 54.84 |  |  |  |  |  |
Key officers | Performance Shares 2 | Minimum |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Target vesting percentage |  | 0.00% |  |  |  |  |  |
Key officers | Performance Shares 2 | Maximum |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Target vesting percentage |  | 150.00% |  |  |  |  |  |
Key officers | Performance Shares 3 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of equity instruments granted (shares) |  | 9,437 |  |  |  |  |  |
Grant date fair value of equity instruments granted (usd per share) | $ / shares |  | $ 70.47 |  |  |  |  |  |
Key officers | Performance Shares 3 | Minimum |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Target vesting percentage |  | 0.00% |  |  |  |  |  |
Key officers | Performance Shares 3 | Maximum |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Target vesting percentage |  | 200.00% |  |  |  |  |  |
Director [Member] | Performance Shares 3 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of equity instruments granted (shares) | 9,114 |  |  |  |  |  |  |
Grant date fair value of equity instruments granted (usd per share) | $ / shares | $ 60.30 |  |  |  |  |  |  |
Incentive Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Remaining shares available for issuance under the Incentive Plan (shares) |  |  |  | 823,597 |  | 823,597 |  |
Shares issuable upon exercise of Incentive Plan awards (shares) |  |  |  |  |  | 157,063 |  |
Employee Stock Purchase Plan (ESPP) |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Compensation costs charged to income: | $ |  |  |  | $ 0 | 0 | $ 143 | 115 |
ESPP proceeds | $ |  |  |  | $ 0 | 0 | $ 811 | 653 |
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 | $ |  |  |  | $ 65 | $ 62 | $ 141 | $ 132 |
Unrecognized compensation costs | $ |  |  |  | $ 25 |  | $ 25 |  |
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 |  |
CTWS [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Acquiree's Common Shares Converted In Cash Per Share | $ / shares |  |  |  |  |  |  |  | $ 70.00
Share-based Compensation Award, Tranche One [Member] | Key officers | Performance Shares |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Grant date fair value of equity instruments granted (usd per share) | $ / shares |  | $ 57.12 |  |  |  |  |  |
Share-based Compensation Award, Tranche Two [Member] | Key officers | Performance Shares |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Grant date fair value of equity instruments granted (usd per share) | $ / shares |  | $ 55.97 |  |  |  |  |  |

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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